Is better to have one of them in my knid of set up? A 6800 rpm engine and a 7500 rpm engine will both take different camshafts. So what effect would moving my lobe seperation from 110 to 112-114 have other than smoothing out the idle? Not Street-n-Strip? = Moderately Wide 110-108 Deg. ... Also referred to as lobe separation angle (LSA) or simply “lobe center.” “Lobe separation angle affects the valve overlap area, and in most cases forced-induction cams are designed with a 112-to-118-degree lobe separation angle. A 110-degree lobe separation angle means that the peak opening points of the intake and exhaust lobes are 110 degrees apart. LSA lobe separation angles, the angle of degrees between the centre of the intake and exhaust lobe. This separation determines where peak torque will occur within the engine’s power range and also has an effect on idle quality and engine vacuum. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. ", I kind of suspected that, I was just wondering. Also with the glide it is much more torque converter dependant, you'll want to see a minimum of 5500 flash stall, preferrably 6000 to 6400. Effect Of Changes In Cam Timing And Lobe Separation Angle The following tables illustrate how variations in lobe separation angle and cam timing will effect the behavior of the engine in which the camshaft is installed. Now a back to back test with a 428. Those are the same specs, and the same cam, as the Lunati 401B4LUN. The cam I was looking at had 230-236 @ .050 with .540 lift. Identical cams other than the LDA. Test C: The first cam was ground at 110 degrees and behaved like the tighter cams above except the torque curves crossed lower down around 5250 RPM. Lobe Separation Angle: This is the relationship between the centerlines of the intake and exhaust lobes. 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. Average power from idle to shift will be about the same. I am obviously going to pick a cam that works in conjunction with all the rest of the parts. The UF71/UF75 is the name I called it at UltraDyne. The lobe separation angle of a camshaft is typically determined by the engine’s purpose, its displacement, and its compression ratio. LOBE SEPARATION ANGLE Above 114 Deg. A cam with a 112 lobe center will idle smoother than a cam … If we were to advance this cam 4 degrees, we would install it at 102 degree Lobe Centerline and 110 degree Lobe Centerline if we retarded the cam 4 degrees. Note that 110 degrees is exactly halfway between 106 degrees and 114 degrees (the EC). The number of degrees between the intake and exhaust lobe centerlines establishes what is called the lobe separation angle. You shouldn't be looking at what the lsa does to or for you, you should have the valve events designed to accomplish your goals and let the lsa fall where it may. Comp Cam 268' int/268' exh/ 110' lobe separation. it uses the 112* lobe sep to stretch the power to 7,000 rpm's. It’s the scavenging effect of the high velocity exhaust gases rushing out that pulls the fresh fuel/air charge into the chamber. Ok I got 2 cam picks from 2 grinders for my 355 1/8 mile bracket motor shifting at 6800. Can you use a performance cam with a 110 or a 108 LSA? More commonly you find that cam companies grind their street cams 4 degrees … This measurement may also be denoted as the lobe displacement angle. Also if it will spin up to 7500 will it be making peak power there and thats where I should shift? The tighter the lobe center, the lower the rpm range; the wider the lobe center, the higher the rpm range. IMHO, cam design is like porting... to paraphrase Smokey Yunich "if you don't do it for a living, leave it to someone who does". = Moderate 108-106 Deg. You're just widening or narrowing the Intake vs the Exhaust events. A fixed angle on a single cam that contains both inlet and exhaust lobes. I always recommend that you contact your favorite cam grinder for specific camshaft recommendations for … The Ford "B" LeMans vs the factory 427-425 CAR cam ground on a 114 L/C. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Anybody here run a 108 LSA? Naturally-aspirated cams are typically in the 106-to-114-degree lobe separation range.” Quick to remind us that we’re speaking in generalities, … All specs identical, if you had a cam on a 110 lobe separation installed at 110 intake centerline, it would have less compression than a 108 lobe separation installed at 108 centerline. I am not concerned with the duration yet because I am not sure how many cubes I am going to go with. = Moderately Tight 106-104 Deg. Intake and exhaust duration along with the lobe separation angle and camshaft … If a cam is ground “straight up,” both centerlines are the same and the LSA is one half of their sum. Assuming proper valvetrain control and shortblock assembly, 8000 shouldn't be a problem for that engine. My duration will be about 230 degrees. The 565 uses the 4.25" stroke to make trq. It will idle worse. I am begining to plan my next engine, most things are pretty much figured out except that elusive camshaft. When considering whether to go a 106, 108, 110, 111 or 112 lsa all the other valve timing events would ideally be about the exact same on each cam. Compression will be in the 14.9:1 area using the supplied specs. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! It has a lobe separation of 110°. A 350cu in oval track racing engine, for example, often runs on a narrow lobe separation angle of 106 … I am not choosing a camshaft purely based on LSA, I know there are many factors that come in to play when picking an cam. For a better experience, please enable JavaScript in your browser before proceeding. I'm going out on a limb here but hell I have before. 6800 is pretty low for a 355 if you're looking for quick et's. The 104 had a distinct torque and power advantage from the get go while the 110 pulled ahead toward the end of the rev range. Cam Advance - the position of the midpoint between intake and exhaust lobes … 106° N/A is usually quicker 99% of the time. Is there a negative side to doing this? The glide is going to hurt your 60' times even though your MPH might improve slightly. Pros and cons of each. Don't put the cart before the horse. This is ground into the cam and can't be changed without … The 106 was quicker in times, but the 114 pulled past 8k and felt a little stronger at top end. = Extremely Tight I hope that answers your question = Tight Below 104 Deg. Unless you are going to build an EACXT engine combination and run the EXACT engine rpm range as the engine combination, selecting a camshaft based on LSA is boggus. Looking at 108vs. I think the IHRA Mountain Motor's use lobe …
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