108 vs 110 lobe separation
Because the lobes are closer together on the 101 LSA cam, the intake closing point is advanced (closes earlier) and the piston has more time to build compressionexactly what the gauge showed. Ultimately, it comes down to how you want the engine to run, the car's intended purpose, and what you are willing to tolerate. 110* LSA - lobe separation angle (lobe displacement angle) The +2* means your intake lobe centerline is advanced to obtain a 108* ICL - intake centerline and a 112* ECL - exhaust centerline. Like choosing a cam in general, the key to eliminating separation anxiety is to find the proper balance of driveability and performance. For a better experience, please enable JavaScript in your browser before proceeding. by Kdub Sun Dec 07, 2008 1:20 am, Post A wider lobe separation angle can often provide more power, but it can also lead to more wear on the engine. 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. 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. "When you've properly tuned a performance motor, you create high- and low-pressure waves in the intake and exhaust that help cylinder filling," said Comp Cams' Billy Godbold. The other thing is that you can make more power with a smaller aftermarket cam. kinda off topic.. but while we're on the topic of cams, duration,lift,ect has anybody heard of using high compreshion (13:1) on pump gas, by useing alot of duration? Kevko baffled oil pan & Milidon windage tray. 106 LSA: As the 106 LSA is a tighter LSA, it fails to generate maximum power. The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. Despite no changes in lift or duration, this cam sounded much more aggressive than the other two with wider LSAs. The Crane has a smoother idle, broader power band, and . The extra cubic inches will smooth out a rough idle in a 327. I just installed a Comp Cams XE262 in a 9:1 350 with stock iron heads. Engine builders Chuck Lawrence, left, and Doug Patton. 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. Idle quality was rough and the vacuum gauge showed only 9.8 in-Hg (inches of mercury). hydraboost is the same as a vacuum brakebooster, only the booster is replaced by a unit that does the same but under hydraulic pressure. I bet you won't see a bit of difference. by Kdub Sat Dec 06, 2008 11:05 pm, Post The lower the lobe seperation,, ie. The first cam featured a wide 120-degree LSA, while cam number two narrowed the angle to 112 degrees. somthing to that aspect. 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. 1-4 It is one of the most common neurological disorders worldwide, 1-5 is among the most common . Post VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Tight LSA cams make excellent low-end torque and have a beautiful power curve. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Before getting to the cam profiles, we had to make sure we had a reasonable test engine. 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. It will sound lovely I'm sure. Coupled that with the low first gear of the five speed, it ought to create some real traction problems. The absence of engine knocking ensures that your car engine is reasonably combusting the fuel. Lobe separation angle does. Brul slid the 113-LSA cam, the widest of the test, into the engine's heart and set about putting all the pieces back in place. It depends on the combination of engine size, head flow and head flow balance, as well as a big one, exhaust flow capabilities. Supercharged and nitrous race engines typically benefit from a wider LSA because they dont require as much overlap for exhaust scavenging as does the naturally aspirated engine, continues Bolander. If you look at the cam card, you will find a maximum lift column on the card.Now, all you have to do is, add up the two mentioned maximum angles and divide the summation by 2. While a cam with a 108 lobe center will idle rougher. It will have slightly higher vacuum at idle, feel smoother through the power curve but have a bit less midrange. in some cases,, the average torque can equal out. I have seen a dyno test where an engine using identical duration and lift made more peak power with a 112 LSA than a 110 LSA. 110 LSA: On the contrary, if you look at the powerband at 110 LSA, the powerband is comparatively broader. The 110 is probably a better choice for a performance street engine. 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Thanks for the replies so far. 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. Enter lobe separation angle. Now here is where it gets tricky. The 402-inch LS2/LS3 hybrid stroker started out with an LS2 aluminum block. Save Share. It had a robust powerband with tons of usable torque. by SStrokerAce Sat Dec 06, 2008 7:36 pm, Post After swimming through the entire article, I hope you are now well aware of the 102 vs 110 lobe separation angle. To reiterate another point, I realize that wider LSAs tend to broaden the power band, but for a car I would like to bracket race a bit, as well as enjoy on the street, I was told that a narrower LSA will help the car accelerate at a faster rate. On a torque graph it tends to resemble a triangular shape.. More than any other component, the cam profile determines things like idle quality, mileage, and overall driveability. As usual, Marc (aka Master) is correct. 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! We borrowed Westech Performance's shop mule, a 370ci small-block Chevy and its SuperFlow 902 engine dyno and spent a day running each cam back-to-back to gauge its effect on peak horsepower, peak torque, cranking compression, idle vacuum, and the powerband as a wholeall the variables that define an engine's character on the street and track. I just bought a 86b Webcam and Im using 1.5's. This recommendation is only if you shift at no more than 7000. Higher overlapping lets less oil fall through the oil inlet. 108 versus 110 will drive the power band down. The takeaway from this test is camshaft LSA is a double-edged sword. But nothing comes without a cost, and idle vacuum suffers as LSA shrinks. After the next three pulls, it was clear the 113 cam was way down on low-end torque. 1-3 Cognitive impairment is common in both FLE and TLE and adversely impacts quality of life and psychosocial functioning. Increasing the EGR effect has a good side in that it reduces the amount of oxygen in the combustion chamber. 1966 Toyota Landcruiserunder construction. A 112-114 degree lobe center will have a better idle and produce more vacuum with less overlap. If you're an OEM automaker looking for a steady idle, good fuel economy, and passing tailpipe emissions, this is the cam of choice. More over-simplifications: 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 But, the internal processings are much more complicated. A narrower LCA will increase valve overlap and close the (intake) valve earlier, which explains the typical rougher idler and more midrange behaviour. Before we all start suffering from separation anxiety, we need to understand what lobe separation angle actually is and then how it affects 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. 112-110 Deg. i think a little more torque will be good for my car.With the XE274 it was a little slugish until around 3000 rpms. by flat4racer17 Tue May 13, 2003 9:12 pm, Post The lobe separation angle is the angle between the two camshaft lobes that act on the valves. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. But that doesnt mean high-strung racing engines cant see gains, as well. to use this representational knowledge to guide current and future action. While a cam with a 108 lobe center will idle rougher. For a better experience, please enable JavaScript in your browser before proceeding. 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. 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. But, at 106 LSA, the cranking compression may increase above the standard PSI level. I do believe that stock VW seperation is 108 and 112 is used alot in turbo and midrange cams for VW's while 106 is used for the top end cams. Hopefully it turns out great. by flat4racer17 Mon May 12, 2003 1:40 pm, Post TH400 Vs Powerglide: Which One is Ideal for You? However, the plentiful exhaust overlap (31 degrees) meant there was lots of exhaust dilution at low engine speed and high vacuum. Maybe even 114. Only once the intake valve has closed can compression begin to build. The standard bore block was then stuffed with a 4340 forged steel 4.0-inch crank and 6.125-inch rods, along with a set of flat-top, forged JE pistons. To overcome this inherent problem in wide LSA camshafts, you simply need a higher-flowing intake port. Simply put, the lobe separation angle (LSA) is a measurement of how the intake and exhaust lobes are phased with each other. 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. 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. The 114 cam will give more low end torque, good midrange, less power up high. 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. . Another important measurement was the torque production at 4,000 rpm and this cam checked in with 484 lb-ft of torque. If you changed the lobe separation of a street engine from 112 degrees to 106 and didnt do anything else, adds Kaase. Getting back to the sound of an engine, its no secret that a raucous, lumpy idle is often preferred by street cruisers, regardless of the ill manners and inefficiency of such an engine setup. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If the cylinder heads are the lungs of an engine, the camshaft is the brain. GRIND #: CRB3 3194 /3196 HR111. You are using an out of date browser. Pinning the tail on the perfect cam can certainly be a difficult task. JavaScript is disabled. A cam's lobe separation determines where and for how long peak torque occurs in an engine's rpm range. (ICL + ECL) / 2 = LOBE SEPARATION ANGLE (LSA) LSA is a RESULT of the PROPER events. Whatever you do, stay under 270 advertised duration and shoot for a 110 lobe separation. Re: Lobe separations on 383-406 cids.104-106-108-110. Your best bet would be to talk to one of the experts at a cam company to get a custom grind if you're that into the specs. LS Exhaust Manifold Bolt Torque (Everything You Need To Know), Holley Power Valve Sizes: Everything There is to Know. But i would nt go any wider than 110. A few other major and, Read More Heres What Causes Your Car to Bog Down When AcceleratingContinue, Your email address will not be published. So, choose the perfect lobe separation angle for your engine, complying with the requirements of your needs. The 114 LSA is good for a blower or nitros motor. but less of it at the same time. All three terms are similar, as they all relate to the relationship between the centerline of the Intake lobe and the centerline of the Exhaust lobe. On the cranking. The taller lobe seperation will have a longer powerband but will have to rev higher to make the power than the lower lobe seperation! When choosing a cam, power gains shouldn't be the only consideration. 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. Professionally ported & polished iron 4V head with titanium intake valves, stainless exhaust, titanium retainers & keepers & dual springs. As you can see in the graph, the 101 LSA cam actually had the highest cranking compression of the batch: 185 psi. I probably would have gone with 3.55 gears had I knows better.. JavaScript is disabled. I don't think your duration figures are too outlandish and with the tight LCA and high lift, it should make some big torque. Well, If I am not mistaken, you must be looking for which angle has what impact on your engine or which would be the best. "It's not having what you want, it's wanting what you've got!"
