";s:4:"text";s:16159:"I am begining to plan my next engine, most things are pretty much figured out except that elusive camshaft. The 106 was quicker in times, but the 114 pulled past 8k and felt a little stronger at top end. Our Comp XE274 is an example of this: the IC is 106 degrees, and the LSA is 110 degrees (4 degrees advanced). Can you use a performance cam with a 110 or a 108 LSA? The tighter the lobe center, the lower the rpm range; the wider the lobe center, the higher the rpm range. Figure 1 shows a normal 270 degree cam. The one in this example is installed on a 106 Lobe Centerline. A 350cu in oval track racing engine, for example, often runs on a narrow lobe separation angle of 106 degrees. Is better to have one of them in my knid of set up? I like everything except the idle, was wanting a little more stealth. Maybe, I am asking too much? JavaScript is disabled. 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. Don't put the cart before the horse. ... Lobe Separation (degrees): 110 Intake Valve Lash (in): 0.016 Exhaust Valve Lash (in): 0.018 Ok I got 2 cam picks from 2 grinders for my 355 1/8 mile bracket motor shifting at 6800. At 215cc and 355 CID you've got enough cylinder head to sustain that kind of rpm but you have to decide where you want power as duration is the ability to sustain power at a given rpm range. Those are the same specs, and the same cam, as the Lunati 401B4LUN. This measurement may also be denoted as the lobe displacement angle. The dyno plot however, shows how different each cam really was. So my question is, if you were to take two identical cams (same lift and duration) but changed the LSA from a 110 to a 106, what would happen to the power/torque output and the RPM operating range? = Moderate 108-106 Deg. LCA lobe centre angle. If you advanced the 110 LSA cam 4* to a 106 installed center line (ICL), the 110 LSA cam would have more compression. It has a lobe separation of 110°. Lobe separation is the amount of degress be... On this episode of PowerNation Extra, the Engine Power guys tell you all about lobe separation and what it means. 6800 is pretty low for a 355 if you're looking for quick et's. “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. Comp Cam 268' int/268' exh/ 110' lobe separation. More "peaky", so to speak. The glide is going to hurt your 60' times even though your MPH might improve slightly. More "peaky", so to speak. So whats the deal with 106 or 110ls? Note that 110 degrees is exactly halfway between 106 degrees and 114 degrees (the EC). 108 vs. 110 lobe separation angle?? When it passes the peak torque RPM, it will "crater", where the 110 will not fall off so fast. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The UF71/UF75 is the name I called it at UltraDyne. The basics of what you want in a nitrous (or supercharger) friendly cam is a wider lobe separation than what most “performance” or “race” cams have. Like every 2 degrees narrower on the LSA the RPM band will be shortened by so many RPM's? A 6800 rpm engine and a 7500 rpm engine will both take different camshafts. Is there any kind of guideline that someone could follow. Jump to Latest Follow ... a long stroke small block like a 383 will make better numbers with a 106 LSA cam vs. one with a wider angle ground into it. Different engine, but same type of results. You're just widening or narrowing the Intake vs the Exhaust events. On a tight lobe separation, like 106-108 degrees, the engine will build torque quickly and reach its peak early. "For those that will fight for it...FREEDOM ...has a flavor the protected shall never know. The second was ground for 114 degrees of lobe sep. BUT I still want … Crane Cam 272' int/272' exh/ 110' lobe separation. The camshaft is the 2nd to the last thing to be purchased, last is pushrods. This can be changed by "degreeing" the cam into the engine. Looking at 108vs. I would need the flow numbers off the of head since they have had work but based on the stock numbers of 215's that customers have supplied: Thanks for all the help. ", 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. 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. A 110-degree lobe separation angle means that the peak opening points of the intake and exhaust lobes are 110 degrees apart. This is going to be in a bracket car so things like power brakes are not an issue. Naturally-aspirated cams are typically in the 106-to-114-degree lobe separation range.” Quick to remind us that we’re speaking in generalities, … = Wide 112-110 Deg. 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. Pros and cons of each. = Moderately Tight 106-104 Deg. = Extremely Tight I hope that answers your question '69 Malibu - 413/600/180/1.6/268/1.625/2.5/X/M20/3.42/255/60/15. 106 LS vs. 108 LS vs. 110 LS cam for 383. Head guy said 52cc I'm thinking they'll come out to 54cc. Cam Advance - the position of the midpoint between intake and exhaust lobes … The 512" engine I had that I wanted to only rev to 6,000 with a 4.14" stroke ran a 108* lobe sep to help build as much trq and hp possible to 6,000. The lift and duration @ 50 are almost the same but the ls on each is the differance, 106 or 110. More commonly you find that cam companies grind their street cams 4 degrees … Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! For a better experience, please enable JavaScript in your browser before proceeding. Use more stall speed with an automatic transmission. Look into at least a 4.88 gear, more if you stick to 1/8 mile tracks, you're looking for your trap RPM to match or be a couple hundred higher than your shift point. Greg,its not normally the block/crank being 2 or 4 bolt main setup that is the limiting factor in max engine rpm in general,thats the cam profile/valvetrain parts like rockers,springs,lighter valves,good breathing heads,intake,exhuast,etc that affect an engines ability to rpm higher. With a nitrous-specific cam, peak torque will be spread out over a … It will idle worse. 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. I was just wondering what would happen in this case to help aid in my desision, what ever it is. 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. Given that nitrous works best in the mid- to upper-rpm range, nitrous-powered engines need a wider lobe separation, like 112-114 degrees. The lobe separation angle of a camshaft is often determined by the engine’s purpose, its displacement and its compression ratio. 110 degrees on the lobe separation angles. If you will notice, most of the popular street high performance grinds are using 110 or 108 lobe separation, and this is not out of line for a street engine. http://i634.photobucket.com/albums/uu63/dave_murdoch/Verminator/P6161359.jpg, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. If a cam is ground “straight up,” both centerlines are the same and the LSA is one half of their sum. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Anybody here run a 108 LSA? Of course, … The 565 uses the 4.25" stroke to make trq. = Tight Below 104 Deg. 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. it uses the 112* lobe sep to stretch the power to 7,000 rpm's. Is there a negative side to doing this? A fixed angle on a single cam that contains both inlet and exhaust lobes. Shorter power band. To me a 2500lb car is light. A 350cu in oval track racing engine, for example, often runs on a narrow lobe separation angle of 106 … For a better experience, please enable JavaScript in your browser before proceeding. The light grey curves show the same camshaft installed an additional four degrees advanced, or at 102 degrees … 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. Anything with a 112, 113 or 114 degree lobe separation is great for blowers and nitrous. Average power from idle to shift will be about the same. “On a naturally aspirated engine, the lobe separation angle has an effect on whether the engine reaches peak torque a … 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. I always recommend that you contact your favorite cam grinder for specific camshaft recommendations for … 106° N/A is usually quicker 99% of the time. The cam I was looking at had 230-236 @ .050 with .540 lift. List your combo and trans/gearing and i can give you a good sugestion - Heads too, compression etc. I am obviously going to pick a cam that works in conjunction with all the rest of the parts. The number of degrees between the intake and exhaust lobe centerlines establishes what is called the lobe separation angle. What I'm trying to do is not overcam this stock low compression truck motor that Im stuck with right now. Anyway would my 2900lbs package be considered light or in between? Lobe Separation Angle or Lobe Displacement Angle – The angle between the centerlines of intake and exhaust lobes, expressed in camshaft degrees. The definition here is simply the distance in degrees, as measured on the cam, between the point of peak lift on the intake lobe … Average power from idle to shift will be about the same. Intake and exhaust duration along with the lobe separation angle and camshaft … I'm going out on a limb here but hell I have before. I am trying to pick out a hydraulic roller cam for my 351W with AFR 185s. Find Crane Cams Camshaft Kits 106 Lobe Separation (degrees) and get Free Shipping on Orders Over $99 at Summit Racing! Bracket car only? 106 will make higher peak torque and HP than the 110, but over a narrower RPM band. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. LSA lobe separation angles, the angle of degrees between the centre of the intake and exhaust lobe. A camshaft consists of intake and exhaust lobes, and a key consideration when designing a cam is the lobe separation angle, sometimes also called the lobe displacement angle, or lobe spread. Smaller LCA = lower power curve ends and higher peak power vs wider LCA = higher power curve ends and a lower peak power! 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. When a cam is advanced or retarded, the Lobe Centerline is changed. Case in point, 355CID circle track engine with an LSA of 107 has a max HP of 631HP and peak torque of 520#/ft and holds with in 7% of peak for 2400 rpm. Also if it will spin up to 7500 will it be making peak power there and thats where I should shift? When it passes the peak torque RPM, it will "crater", where the 110 will not fall off so fast. “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. ... Also referred to as lobe separation angle (LSA) or simply “lobe center.” What would be best and why? 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. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. = Moderately Wide 110-108 Deg. Summit Cam 282"/282" 114' lobe separation. The lobe separation angle of a camshaft is typically determined by the engine’s purpose, its displacement, and its compression ratio. Now a back to back test with a 428. This is not considered a narrow powerband by any means. Also, the jump in manifold vacuum between the 104 and 110 grinds is pronounced, especially Untill you have cylinder heads, CID, rod length, carb cfm, and desired power range there is no way in hell to select a camshaft based on LSA. So much for apples to apples. 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". A cam with a 112 lobe center will idle smoother than a cam … I am not concerned with the duration yet because I am not sure how many cubes I am going to go with. Thanks>. For timing 25-65-65-25, the lobe separation is 110 cam degrees (220 crank degrees). It will idle worse. The Ford "B" LeMans vs the factory 427-425 CAR cam ground on a 114 L/C. It’s the scavenging effect of the high velocity exhaust gases rushing out that pulls the fresh fuel/air charge into the chamber. They also checked manifold vacuum and in all cases vac did not drop more than 1" with the tighter lobe … I am just curious what affect it has on the engine, and if there is any research done on the subject I would like to read it to further my understanding and with this knowlege hopefully it will help me make the right decision. This is ground into the cam and can't be changed without … I think the IHRA Mountain Motor's use lobe … Assuming proper valvetrain control and shortblock assembly, 8000 shouldn't be a problem for that engine. Thanks Dave. Both companies have my masters, and make the same cam, they just call it different names. 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. Lobe Separation Angle: This is the relationship between the centerlines of the intake and exhaust lobes. Not Street-n-Strip? Crane Cam 274' int/274' exh/ 106' lobe separation. My duration will be about 230 degrees. So what effect would moving my lobe seperation from 110 to 112-114 have other than smoothing out the idle? 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. Automatic? Car craft magazine had a dyno test on just this topic about 18 months ago, tested 3 cams with same duration and lift with different LSA. Although both wide (112-116) and narrow (102-110) lobe-separation angles do have some effect on overlap, it's still possible to get tons of overlap with a very wide lobe-separation angle. Identical cams other than the LDA. The lobe separation angle is basically the measurement in degrees of the angle between the intake and exhaust lobes, and is generally between 104 and 118 degrees. lobe separation angles. Lobe Separation Angle = (intake centerline + exhaust centerline) ÷ 2 LSA = (106 degrees + 114 degrees) ÷ 2 = 110 degrees. Simply put the lobe center of the camshaft controls where the power curve is applied. I was also going to use 1.6 rockers to get … = Extremely Wide 114-112 Deg. Compression will be in the 14.9:1 area using the supplied specs. JavaScript is disabled. We show it installed in the engine 4° advanced, or at 106° intake centerline. LOBE SEPARATION ANGLE Above 114 Deg. Lobe separation, or lobe separation angle, is the distance (in camshaft degrees) that the intake and exhaust lobe centerlines are spread apart. 106 will make higher peak torque and HP than the 110, but over a narrower RPM band. ";s:7:"keyword";s:26:"106 vs 110 lobe separation";s:5:"links";s:920:"How Old Is Chris O'donnell,
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