108 vs 110 lobe separation

The 120-degree cam minimized torque production through most of the curve, while the 112-degree cam offered more torque but slightly less peak power. This causes the engine's street manners and tuning to become fickle. Once more the engine came apart to install the third test cam, a 107 LSA. The 114 cam will give more low end torque, good midrange, less power up high. The final cam was tighter still, with a 108-degree LSA. Some prefer a narrow powerband, and some prefer the broader one. I will be running an Edelbrock Performer RPM, with a Quick Fuel 750cfm with a screw adjustable vacuum secondary; it's called the Pro-vac. 112 vs 114 lobe centers You cannot tell the differance in the two . It may not display this or other websites correctly. 110 LSA: On the contrary, if you look at the powerband at 110 LSA, the powerband is comparatively broader. 110 degrees on the lobe separation angles. Walter Noah is a process engineer who has a knack for resolving even the toughest technical issue. Anybody here run a 108 LSA? It a 355. thanks in advance. Lobe seperation cant be seperated from duration,the 2 are connected.the old duntov cam had a lot less duration than many new cams so the valve overlap was not extreme and the engine ran with a gentle lope.Increase the duration by 20* and this cam would shake a 283 out of the car at idle,but then increase the lobe seperation by 4* and the motor will have a gentle lope again. 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. Call for details with your specific combination. Comp cam hydraulic roller lifters. JavaScript is disabled. I just bought a 86b Webcam with 112 lobe centers for my 2276. 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Disclaimer: Remember to always consult with an expert first before trying anything at home. I wouldn't assume 4 links fuel requirements will mirror yours at all. With the first cam loaded in the engine (the 101 LSA) Westech's Steve Brul made three dyno pulls, the average of which was saved to compare to the next cam. To further minimize any dyno variations, the engine's oil and water temperatures were kept the same for each pull. Boom, you get the lobe separation angle of that engine. But an interestingly shocking fact is that this event escalates the air-fuel mixtures reaction rates, causing temperatures to rise and causing the problem of overheating the engine. However it is at the expense of a small amount of bottom end power and idle quality, due to the increased overlap. 110 LSA: The 110 LSA shows up mechanically advantageous in mechanical aspects like higher RPM, lower engine knock, moderate cylinder pressure, improved idle vacuum, and higher piston-to-valve clearance. The absence of engine knocking ensures that your car engine is reasonably combusting the fuel. Post Camshaft lobe separation angle: what does it mean? | Moore Good Ink Generally speaking, decreasing the lobe centerline angle increases overlap. 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. "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. Lobe Separation Angle "LSA " | Yellow Bullet Forums Now its not shifting into 3rd and you are here. JavaScript is disabled. I'd also go to a 110-112 lobe separation angle. 04 Minor modifications to the factory windage tray were necessary to work with the new stroker assembly. To overcome this inherent problem in wide LSA camshafts, you simply need a higher-flowing intake port. More over-simplifications: Save my name, email, and website in this browser for the next time I comment. Lobe Separation Angle. - 332-428 Ford FE Engine Forum 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. The only reason the advance or retard a camshaft profile is to get the timing events where they need to be. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! . lobe separation angle | For A Bodies Only Mopar Forum Your email address will not be published. Making this the biggest obstacle to overcome when selecting a cam profile with one of our tech advisors, explaining the definition and importance of the Lobe Center. Pinning the tail on the perfect cam can certainly be a difficult task. 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. THis is a real generalization, but the weaker your heads, the more you will like the smaller centers ( 106-108) the better the heads, and the higher the compression, the more it will like the wider centers ( 112-114)everything else falls somewhere in the middle( 108-110) Once you get close with the cam centerlines, it wont make much differance if you change it up or down by 2 degrees. music to your ears? Now here is where it gets tricky. 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. OK, what is hydraboost, and how do you like how the cam performs??? If you changed the lobe separation of a street engine from 112 degrees to 106 and didnt do anything else, adds Kaase. 106 lobe sep. in a street car. | NastyZ28.com JavaScript is disabled. by Paul H Tue May 13, 2003 1:24 pm, Post That is why 106 LSA consumes less oil. For a better experience, please enable JavaScript in your browser before proceeding. However, a cam with 108 will only pull 12-16", which is not enough for power assisted accessories. I have Crane hydraulic link bar style roller lifters, so I dont have to use the spider style. The LSA, or lobe separation angle, is ground into the cam and cannot be changed. The Idles increasing vacuum improves the idle quality and the engines overall performance. Simply put, both 106 and 110 lobe separation angles have many advantages and disadvantages. Many later model engines use wide lobe separation angles to reduce overlap for idle quality and fuel economy. from the intake to the exhaust and vise-versa.Thats why a performance cam will usually have a rougher idle than a stock one. The 114 LSA is good for a blower or nitros motor. It will sound lovely I'm sure. Around 70 percent of muscle-car performance cams fall into this range. 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. 106 LSA: The scale of efficient compression rises at 106 LSA. The right camshaft choice | Hemmings Although both wide (112-116) and narrow (102-110) lobe separation angles do have an effect on overlap, it's still possible to get a lot of overlap with very wide lobe separation angle cams. 106 LSA: There is an increasing chance of engine knock at the 106 lobe separation angle. GRIND #: CRB3 3194 /3196 HR111. As a result of this fall, the idle of the engine has to face suffering quite often. It depends on the combination of engine size, head flow and head flow balance, as well as a big one, exhaust flow capabilities. Comparison Table Between 106 Vs 110 Lobe Separation Angle. To establish the position of each lobe, the traditional reference point is where the lobes reach max lift. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open. Bad idea in my view. such as 290 @.050? Meaning the lower lobe seperation will have a very quick and fast powerband (Snappy!) 110 LSA: On the other hand, 110 LSA is a wider LSA with almost no overlap. Despite no changes in lift or duration, this cam sounded much more aggressive than the other two with wider LSAs. After the next three pulls, it was clear the 113 cam was way down on low-end torque. That lopey idle that is universally loved, and part of the allure of a tight LSA cam, is actually misfire caused from a combination of exhaust dilution in the intake manifold and poor cylinder filling at idle. A cam's lobe separation determines where and for how long peak torque occurs in an engine's rpm range. 108 vs. 110 lobe separation angle?? | Vintage Mustang Forums That is no accident. But, the internal processings are much more complicated. 07 Though the CNC-ported heads offered plenty of flow, it was necessary to upgrade the supplied valvesprings. = Moderate 108-106 Deg. Camshaft: Hydraulic Roller, Comp Cam custom grind (ADV Duration 281-287,@ .050 230-236, lift 622I & 625E w/1.6 rockers.) 12 In terms of power production, the stroker LS3 performed best with the tightest lobe separation angle. 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. When degreeing in the camshaft, you are making sure the intake centerline is precisely where the cam is intended to be. I had an XE 274 in it. The 112-degree cam (red lines) picked up much of the torque, but the big winner was the cam with the tightest lobe separation angle. to use this representational knowledge to guide current and future action. 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 . by xstfudonniex Sat Dec 06, 2008 4:21 pm, Post Defining Lobe Center - Clay Smith Cams Some of the programs like engine analyzer pro and dynomation seem to like some of the wider lsa's.Thanks again JOE. 106 Vs 110 Lobe Separation Angle: Real Impacts You Must Learn As boost increases, the air will be forced through the cylinder, vs. being trapped in the cylinder. For a better experience, please enable JavaScript in your browser before proceeding. ( 2 ) Estimated Ship Date: Feb 23, 2023 (if ordered today) Drop Ship. An icon used to represent a menu that can be toggled by interacting with this icon. As you can see in the graph, the 101 LSA cam actually had the highest cranking compression of the batch: 185 psi. 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. So the wider LSA introduces a broader and therefore longer torque band.. Again this is dependent on your shift rpm and assuming you truly have 14-1 compression. Coupled that with the low first gear of the five speed, it ought to create some real traction problems. Need some Cam Advice! | Chevy Tri Five Forum Required fields are marked *. 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. by mrsmythe Tue May 13, 2003 5:45 am, Post by ANT Thu May 15, 2003 6:44 pm, Copyright 2022, S&S Motorsports LLC, All Rights Reserved - Powered by phpBB Forum Software phpBB Limited. 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. A cam with a 112 lobe center will pull approximately 16-20" of vacuum, which is good for power brakes. But it also has a lot of lobe separation. That was just a glimpse of the information you were looking for.