108 vs 110 lobe separation 108 vs 110 lobe separation

i have a 4 bolt 351C, stock bore, 10.5 cr with 351C Boss heads ,boss crank and rods. The tighter the lobe separation angle, the peakier the power curve will be, confirms Bolander. Frankly cams with a 108-114 lca unless in the perfect combo you won't usually see more than 15hp and you won't really feel the difference except for either a peaky or broad power band. Tight lobe separations, such as 108 or shorter, will cause the peak torque to build earlier in the RPM range and peak-out in a short amount of . 13 The three power curves indicate that the wide (120-degree) LSA (green lines) lost considerable torque to the other two cams. Armed with more information on camshaft theory, what will you build? It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open. I don't know about 13 to one but I have seen 12 to one on a 350 chev in hot rod article, BUT the guy soft petals around on the street with no full throttle use and puts racing gas in at the track. 2023 Power Automedia. It provides a spark plug with the high voltage needed for combustion. Again, these are general bits of conventional wisdom. Moreover, a user from the Chevelle forum said. lobe centers and lobe separation are 2 different things . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Disclaimer: Remember to always consult with an expert first before trying anything at home. Frontal lobe epilepsy (FLE), the second most common focal epilepsy syndrome after temporal lobe epilepsy (TLE), is frequently drug-resistant and MRI-negative. The idle quality was better with the 112-degree LSA but not as good as the wider 120-degree cam.The ultra-wide 120-degree LSA lost low-speed power and never recovered, but know that this wide LSA is often beneficial on positive displacement, supercharged applications. Defining Lobe Center and It's Importance to Engine Performance: A Blog. by Hoxviii Mon May 12, 2003 7:50 pm, Post Ultimately, it comes down to how you want the engine to run, the car's intended purpose, and what you are willing to tolerate. It really comes down to the application. *If you do not have enough vacuum, you can in some cases install a vacuum canister or reservoir, which works by storing the peak vacuum in the reservoir. Despite no changes in lift or duration, this cam sounded much more aggressive than the other two with wider LSAs. The stock valvesprings supplied with the CNC LS3 heads were swapped out in favor of a set of dual springs from Brian Tooley Racing. We do not stock profiles with 109 or 114 lobe centers. The ported heads were capable of supporting over 700 hp, so we knew they would not be restrictive on our stroker. Its the shifting problem again with your Chevy! The lower the lobe seperation,, ie. This is why the LS series, and many other modern engines, can make great power on top and bottom with wide LSA camshafts and why a plethora of factory cylinder heads are flowing near (or above) 300 cfm. I am trying to pick out a hydraulic roller cam for my 351W with AFR 185s. Also know as Lobe Separation; Lobe Center is simply the distance between the peak opening points on the Intake and Exhaust lobes. To overcome this inherent problem in wide LSA camshafts, you simply need a higher-flowing intake port. Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. by ANT Tue May 13, 2003 1:08 pm, Post Idle vacuum showed a considerable spike to 14.7 in-Hg, likely the difference between being able to run power brakes and a mandatory leg workout. Adding an aftermarket cam to an otherwise stock engine can boost output by 40-60 hp (or more) with no other changes (except possibly a valvespring upgrade). by Paul H Tue May 13, 2003 1:24 pm, Post These favorable mechanical features depict the powerful acceleration capacity of the engine with higher oil and energy consumption rate, overheating problems, and other mechanical problems. A cam with 110 lobe center will pull approximately 14-18"of vacuum is borderline for that type of application. The 110o will make more power overall. " - Voltaire. When you don't have any overlap, you can't have any wave tuning. Also present during testing was a set of 1 7/8-inch Kooks headers, Comp hydraulic roller lifters, and F-body oil pan. Meaning the lower lobe seperation will have a very quick and fast powerband (Snappy!) Anybody do any real testing on LSA in a 3.75 stroke small block chevy?I have always used 104-106 and was thinking about trying a 108 or 110 design.I know there is a lot of variables but just a general opinion from any experts.This is for motor only no nitrous.600-640 HP engine combos.Much appreciated! A 112-114 degree lobe center will have a better idle and produce more vacuum with less overlap. LSA helps determine the cam's behavior; you can take a given set of lift and duration figures, change the LSA, and get cams with vastly different characteristics. 110 LSA: On the contrary, at 110 LSA, the engine fails to reach the maximum torque, resulting in a decrease in torque rate. That is why 106 LSA consumes less oil. Usually, an old gas tank is responsible for a vehicle bogging down during acceleration. Let's just talk lobe sep angle. For Example: A 110-degree lobe separation means that the peak opening points of the Intake and Exhaust lobes is 110 degrees apart. I have used some cut on a 110 that worked well too, but they never sounded as good as the tight ones. The #1 intake lobe centerline is usually between 100 If that were the only consideration, the 101 cam is the clear winner. i think a little more torque will be good for my car.With the XE274 it was a little slugish until around 3000 rpms. Retarding the camshaft (a higher intake lobe centerline number 108 vs. 104) will generally start the power band later in the RPM range and decrease the cylinder pressure. If the overlap phase occurs too early, it will create an overly rich condition in the exhaust port, severely decreasing the gas mileage. If it occurs too late, it will lean out the cylinder and greatly hinder the performance of the engine. Realize what the engine is going in, however, as you may not be able to use the wildest cam out there. by SStrokerAce Sun Dec 07, 2008 12:22 am, Post For a better experience, please enable JavaScript in your browser before proceeding. 12 In terms of power production, the stroker LS3 performed best with the tightest lobe separation angle. This was science at work, and with data in tow, it was time to crunch the numbers and find out what was going on. A mobile functional near-infrared spectroscopy (fNIRS) was used to record cerebral oxygenation signals in the left prefrontal cortex (LPFC), right prefrontal cortex (RPFC), left parietal lobe (LPL), and right parietal lobe (RPL) and analyze the EC of the cerebral cortex. 114LSA +4 puts the intake centerline at 110 degrees before top dead center. I just installed a Comp Cams XE262 in a 9:1 350 with stock iron heads. Part Number: HRS-CL120325-08. The 402 was run with a FAST LSXR LS3 intake and matching 102mm throttle body along with stock LS3 rockers, a Holley HP management system and 7.4-inch hardened pushrods (from Comp Cams). I've seen that Webcam cams can be ordered with either of the above. A forum community dedicated to Ford performance owners and enthusiasts. Well, it is quite a natural event that you may not find the lope separation angle mentioned at the engine body. However it is at the expense of a small amount of bottom end power and idle quality, due to the increased overlap. A cam in the 110112 LSA range provides the necessary idle lobe to appease gearhead ears with acceptable manifold vacuum to run vacuum-operated accessories. But this is not the only reason. 106 LSA: You can see an increasing EGR effect at 106 LSA. For a better experience, please enable JavaScript in your browser before proceeding. Not a HUGE, but a significant difference between 110 and 112, but those are the trends. A commonly held misconception is that intake/exhaust overlap contributes to lower cranking compression. Here are the basics: higher lift values open the valves to increase airflow and longer duration keeps the valves open longer. Lobe sepsration is an advanced description for overlap.If you take a cam on a 112,and grind it on a 108,you add more overlap,the time the valves are both open.Narrower lobe centers mean more low end and midrange torque,along with a peakier powerband,and a slightly rougher idle.Tradeoffs are sensitivity to octane ratings,total timing, and air fuel ratio.A lot to swallow I know,hope this helps you. What happens when you change ONLY. Camshaft: Hydraulic Roller, Comp Cam custom grind (ADV Duration 281-287,@ .050 230-236, lift 622I & 625E w/1.6 rockers.) The engine has AFR heads, Crane rockers, a TCI balancer, a Scat Rotating assembly with Mahle pistons, an Edelbrock RPM Air-Gap intake, an MSD ignition, and an Aeromotive fuel system. Either learn to fix it, or learn to write checks. With a 108 degree lobe center, a cam will have a rougher idle and produce less vacuum due to more overlap. I though my car would have a nice rough idle with the solid cam with a tight LSA I put in my car, its go a slight lope to it, but it pulls hard. Our content is merely suggestive, not intended to use without proper safety precautions and advice. We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. = Moderate 108-106 Deg. However, these rules are not absolute. However, the plentiful exhaust overlap (31 degrees) meant there was lots of exhaust dilution at low engine speed and high vacuum. also,, wider will produce a wider and more flat torque curve that doesn't fall off as abruptly up top rpms. Exhaust reversion is another undesirable side effect that can be caused by overlap. A wider lobe center will give you more overall torque (comes in earlier and stays later). It is the angle that separates the intake and exhaust lobe for a particular cylinder, and is measured in camshaft degrees. 4-linked72, what cam are you using that has a 108 LSA? 110 LSA: You will find the complete opposite scenario here. Your email address will not be published. You can research your heads to find out where yours are, but honestly I don't think it will be worth the effort on a tow vehicle. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. LSA is a way of summing up the relative timing of the intake-valve events (intake opening, intake closing) to the exhaust-valve events (exhaust opening, exhaust closing) in relation to each other, and it's a great approximation of how the engine will operate. More than any other component, the cam profile determines things like idle quality, mileage, and overall driveability. "When the low-pressure wave in the exhaust reflects into the intake, the pressure delta actually helps pull air and fuel into the cylinder. The Crane has a smoother idle, broader power band, and . Copyright 2022, S&S Motorsports LLC, All Rights Reserved - Powered by, http://www.webcamshafts.com/cam_glossary.html, http://www.newcovenant.com/speedcrafter haft/3.htm, Webcam 86A 108LC w/1.5 vs 86B 112LC w/1.3s. Good cam for a lower rpm street engine. Big strokers like tighter LCA but it really depends on your combo and usage, theres great OTS cams but for a custom engine a custom cam is the way to go With identical cam lobes you won't see a bit of difference. Engine knocking generally occurs when the burning of the fuel by the engine is uneven. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. If you take any of the . This comparison highlights that the 106 LSA is a good performer in a few mechanical aspects than the 110 LSA. by jobes Sat Dec 06, 2008 3:51 pm, Post A cam's lobe separation determines where and for how long peak torque occurs in an engine's rpm range. There are General guidelines about the effects of LSA but it should not be the deciding factor in choosing a cam. As usual, Marc (aka Master) is correct. you cannot just take a random change in a lobe separation angle and say 1 is better than the other. 06 The ported heads featured a 2.165/1.590-inch valve combo. A 110-degree lobe separation angle means that the peak opening points of the intake and exhaust lobes are 110 degrees apart. This overlapping has a direct influence on the oil consumption rate of the engine. 2.1.2.4.2 Side-lobe suppression shall be provided in accordance with the provisions of 3.1.2.1.5.2.1 on all Mode S-only all-call interrogations. What Is the SBC Header Bolt Torque? ~These are just some of the drawbacks weas guys who like to go mach 10 with our hair on fire and these little motors screaming at rpms that make other guys cryhave to deal with.~. 01 Choosing the right lobe separation angle for your LS cam shouldn't cause anxiety. = Tight Below 104 Deg. Average power was also down, but the engine pulled ahead of the 101 cam at 5,400 rpm, picking up 6.5 hp at peak. I think you are asking a lot of a cam . In reality, a cam with 220 at 0.050" and a lobe center angle of 112 will have the exact same mechanical overlap as a cam with 217 at 0.050" and a lobe center angle of 109. So, now you, Read More Chevy Transmission Wont Shift Into 3rd: Finding the Main CulpritContinue, While changing the oil on your boats lower unit, you may need to change the drain plug, too. Howards Cam Vs Comp Cam: Which Is The Best Option For You? It is an important note you must keep; due to the lobe separation angle, there creates an overlapping of intake valve opening time and exhaust valve closing time and vice versa. Enter lobe separation angle. Pick the cam with the valve timing events that fit the engine best, forget about LSA, it is only a result of the events. 09 All testing was run through a set of 1 3/4-inch long-tube headers and 3-inch exhaust. Lobe Separation or Lobe Centers is another way of expressing the Valve Overlap, which was the term formerly used by cam manufacturers before industry standard verbiage changed. changing just the LSA on my cam wouldnt make a bit of difference on vacuum operated items E ericnova72 More for Less Racer Joined Jan 13, 2007 22,026 Posts To illustrate the differences offered by changes in the LSA, we had Crane cams grind us three cam profiles that shared the same lift and duration figures, but differed only in the LSA. You can modify the lobe center a little bit but not enough to change the actual overlap of the grind. Like one cam is 112 degree and the next is 108 the 108 cam will allow less "leakage"? The center of those 2 events is the LOBE CENTERLINE (ECL). General topics - 76 LA built, CA car with m20. by trmnatr Sat Dec 06, 2008 10:45 pm, Post The result sounded wonderful, but it didnt rev as enthusiastically and it made 30 less horsepower than normal, says Lawrence. The engine would idle a lot rougher and generate worse exhaust emissions largely because of unburned fuel.. The takeaway is simple on the surface: A tighter LSA makes more low-end and peak torque at the expense of just a few top-end ponies. Seeking 1/2" ID x 5/8" OD Black Exit Tubing for Radiator Overflow Reservoir. Once more the engine came apart to install the third test cam, a 107 LSA. The same is true for intake valve closing. The Idles increasing vacuum improves the idle quality and the engines overall performance. That is no accident. The 108 LSA offered the lowest idle vacuum of the three (down 4 inches). Next up was the 112-degree cam, which actually lost out in peak power slightly to the 120-degree cam, but offered considerably more torque. The takeaway from this test is camshaft LSA is a double-edged sword. While a cam with a 108 lobe center will idle rougher. Known as "The Gladiator" around Westech Performance, this Dart SHP blockbased, 370ci, small-block Chevy has made thousands of dyno pulls testing all manner of heads, intakes, cams, and every other crazy thing us magazine folk have coerced Westech's Steve Brul to bolt to it. FWIW. The only reason I . GRIND #: CRB3 3194 /3196 HR111. You are using an out of date browser. 1-3 Cognitive impairment is common in both FLE and TLE and adversely impacts quality of life and psychosocial functioning. by ANT Mon May 12, 2003 1:47 pm, Post We even treated them to some chamber work before installation. The 112-degree cam produced peak numbers of 567 hp at 6,200 rpm and 540 lb-ft of torque while pumping out 511 lb-ft of torque at 4,000 rpm. by mrsmythe Tue May 13, 2003 5:45 am, Post (2002) et rappel sur une carte hors texte. A cam card with its myriad numbers, acronyms, and abbreviations is one red-pen stroke away from a failed math test. 110 LSA: On the contrary, it is pretty unpleasant to inform you that the efficient compression rate decreases at 110 LSA. Engine builders Chuck Lawrence, left, and Doug Patton. So, the 110 LSA engine is a suitable choice for people prone to be the fan of a powerful engine with mighty acceleration power. It a 355. thanks in advance. JavaScript is disabled. With minimal overlap and a steady manifold vacuum signal, they work great with fuel-injection systems and are the norm on modern pushrod engines, such as the LS and Gen III hemi. Anybody here run a 108 LSA? 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Builds More High-RPM Power Increase Piston-Intake Valve Clearance Decrease Piston-Exhaust Valve Clearance EFFECTS OF CHANGING LOBE SEPERATION ANGLE (LSA) Tighten (smaller LSA number) Moves Torque to Lower RPM Increases Maximum Torque Narrow Power band Builds Higher Cylinder Pressure Increase Chance of Engine Knock Increase Cranking Compression 110 LSA: On the contrary, 110LSA has a higher piston-to-valve clearance rate. I think that cam had 110 lobe sep. Im loking at a summit cam with close to the same lift and duration #s but 114 lobe sep. But, you may find a lobe wider than a 120-degree angle in any car engine.But, I must let you know that those are customized car engines prepared for any special purpose, such as racing, drag racing, off-road riding, or performing stunts. JavaScript is disabled. Split duration/lift only helps when your intake/exhaust ratio is low on the exhaust side. The first cam featured a wide 120-degree LSA, while cam number two narrowed the angle to 112 degrees. Aug 20, 2006. Looking at 108vs. Pretty much standard for an RV type cam. But it is a piece of good news for your engine. It has been tried in the VW business earlier, but then they gave it up because of problems with too high temperatures around the exhaust valve, causing them them to break. A good amount of idle vacuum or increased idle vacuum found at 110 LSA advances the engines efficiency. Powerband serves a massive contribution to the acceleration car. The tightest LSA (101) was worth 21.5 lb-ft of torque and a much broader powerbandat the cost of much lower idle vacuum, which would make it more temperamental in a street car. 2.1.3 Transponder reply modes (air-to-ground) 2.1.3.1 Transponders shall respond to Mode A interrogations in accordance with the provisions of 3.1.1.7.12.1 and to Mode C interrogations in accordance . 110 LSA: But, contrarily, at 110 LSA, you dont have to face the problem of engine knocking. Noah knows a lot about whats happening in the car industry with the latest piloting productions thanks to his professional experience. Bad idea in my view. Okay, have a sigh because you have opened the right door. Ultimately, it makes the 110 LSA an oil-consuming LSA. The intake air control valve (IAC), which regulates idle speed, also has to work overtime and often attempts to "catch" the idle, but usually shoots high or low. In the 106 LSA, the engine can reach the maximum torque, making the driving more efficient and saving energy. Similarly, 110 LSA is also found to be a more fabulous performer in several mechanical aspects. Do you like to go fast? This wave tuning is what helps performance engines achieve volumetric efficiencies of more than 100 percent. but less of it at the same time. In general, a stock replacement camshaft with duration of less than 200 degrees will have a lobe separation angle of more than 114 degrees. Some of the confusion on this subject comes from what the meaning of "bottom" and "top" is to the speaker, I suppose. It had a robust powerband with tons of usable torque. by randy331 Sat Dec 06, 2008 10:00 pm, Post So, sit tight back and explore. 554"/577" lift. If the exhaust valve closes too early it will trap some of the spent gases in the combustion chamber, and if it closes too late it will over-scavenge the chamber and take out too much of the charge, again creating an artificially lean condition. Pinning the tail on the perfect cam can certainly be a difficult task. Everyone has a different idea of gentle.While its true that the duntov cam may seem rough in a 283 it is still a factory offering and they never go to radical on there profiles for street cars.If you want a rough idle, try a 283 with a .550'lift roller and 13.5 to 1 compression,THATS ROUGH. Lobe separation angle does. Some of the programs like engine analyzer pro and dynomation seem to like some of the wider lsa's.Thanks again JOE. OK, what is hydraboost, and how do you like how the cam performs??? 108 Lobe Separation These are my motors specs 1979 - 347 Stroker 10:1 Compression Holley 670 Street Avenger or a Holley 650 (I have both) Roush 200 Cylinder Heads (minor head work) 1.6 Roller Rockers Shorty BBK Headers 373 Rear End 5 Speed Transmission Cross Gap Intake (Power Band 1500-6500) FlowMaster Dual Exhaust (of course no Cats) MSD 6Al (You can find an instructional video of how to do just that on our Clay Smith Cams YouTube Channel;https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s ). A 232 deg duration cam with a 108 deg LCA will have the same valve overlap as a 236 deg cam with a 110 deg LCA and idle will probably be very similar. 110 LSA: However, if you look at the rate of cranking compression at 110 LSA, you will find a reduced compression rate from the standard cranking compression PSI level. The 290 advertised duration and 114 lobe separation would contribute to a lazy power curve. This is one of the many reasons why Clay Smith Cams always recommends degreeing your camshaft in using the Lobe Center Method. i've heard of this being done something about the massive amounts of duration allowes gasses to disipate? For your convenience, I am providing a comparison table to give you an overall idea about the comparison. Come here to talk with others who like to drive fast. The exhaust has an opening even and a closing event. 3.75" stroke= 108 LSA 4.00" stroke= 110 LSA 4.25" stroke= 112 LSA 4.50" stroke= 114 LSA I can see exactly where his theory is coming from. The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. Higher lift and longer duration profiles add power, but do so at higher engine speeds (especially true of duration). 112 vs 114 lobe centers You cannot tell the differance in the two . The SAME can be said. The lumpy-idling 101 LSA cam churned out an average of 484.0 hp at 6,100 rpm with 493.9 lb-ft of torque at 4,400 rpm. Re: Lobe separations on 383-406 cids.104-106-108-110. LS Exhaust Manifold Bolt Torque (Everything You Need To Know), Holley Power Valve Sizes: Everything There is to Know. Pontiac 326 Vs Chevy 327 Differences & Similarities. The reduced rate of the EGR effect lowers oxygen circulation in the engines combustion chamber. Nothing makes mouths drop like a car that sounds and looks like it can't keep it self still! While a cam with a 108 lobe center will idle rougher. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. For a better experience, please enable JavaScript in your browser before proceeding. As the RPM's go up this is not as critical as the higher velocity of the air/fuel moving thru keeps it from getting contaminated. Required fields are marked *. Lobe separation angles, he continues, are influenced by the camshaft grind. A cam with a tighter LSA will require a looser torque converter, may not be able to run vacuum-assisted brakes, and doesn't play nice with fuel injection. To establish the position of each lobe, the traditional reference point is where the lobes reach max lift. Test 1 was easy. LSA is the distance from the centerline of the intake lobe to the centerline of exhaust lobe. ALL bolts are ARP. Post 106 LSA: As the 106 LSA is a tighter LSA, it fails to generate maximum power. Increasing the EGR effect has a good side in that it reduces the amount of oxygen in the combustion chamber. This cam split the difference between the 101 and 113 down the middle, and in theory should have walked the line between the results of the last two tests in every waywhich it did. Lobe Separation Angle, or LSA, is the number of degrees that separate the peak lift points of the cam's intake and exhaust lobes. This causes the engine's street manners and tuning to become fickle. Now its not shifting into 3rd and you are here. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If the cylinder heads are the lungs of an engine, the camshaft is the brain. Ed JTO learn to park Joined May 31, 2009 180 Posts Tuning this cam would be slightly more difficult due to the reduced idle vacuum, but it is hard to argue with all the extra power. Changing the lobe separation angle changes the amount of overlap that exists during the time the intake and exhaust valves are both open, echoes Doug Patton of Pro Line Race Engines. But i would nt go any wider than 110. As a result, a wider valve opening system with no overlapping allows more oil to fall through the oil inlet. Now that we have a basic understanding of lobe separation angle, we can put together a test to illustrate just what happens when you make changes to it. On a naturally aspirated engine, the lobe separation angle has an effect on whether the engine reaches peak torque a little earlier or later in the rpm range. We will also custom grind any of the above profiles with a custom lobe center, for an additional $20 dollars. A narrower lobe separation angle can provide less power but can also lead to less wear. Has anybody experienced it/ tried it? It will have slightly higher vacuum at idle, feel smoother through the power curve but have a bit less midrange. If you compared these two cams side by side in identical engines, the first cam would actually have a slightly better idle and would produce slightly more peak power at upper RPM's. A few other major and, Read More Heres What Causes Your Car to Bog Down When AcceleratingContinue, Your email address will not be published. 11 Doing LS cam swaps on the engine dyno is a breeze, each taking less than 1 hour. 108 versus 110 will drive the power band down. It will also give you a smoother idle and probably even better gas mileage. = Moderately Tight 106-104 Deg. But, you may find it quite shocking that the piston-to-valve clearances decreasing rate raises the chance of damaging the valve by the piston. As a result of this fall, the idle of the engine has to face suffering quite often. I know a little about cams. On the surface, the camshaft's job is simpleopen and close the valvesbut beyond that topical description, it's one of the most mysterious and misunderstood engine components. The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. I'm surprized at these questions as well as some of the replies. " Turbochargers are not as simple as they may sound; you may think of them only as power-boosting components. 03 The 4.000-inch crank and 6.125-inch rods were combined with a set of forged asymmetrical pistons from JE. A forum community dedicated to hot rod owners and enthusiasts. I also like the 106 lobe separation with the intake on 103. Another difference between the two involves the power curve. These issues can often be worked through by an advanced tuner, but always present a challenge and compromise in tuning strategy. That was just a glimpse of the information you were looking for. The 114 cam will give more low end torque, good midrange, less power up high.