= Moderately Tight 106-104 Deg. They both are on 110 . This spec by itself really doesn't mean anything. Intake Lobe Centerline: 108 ATDC: Exhaust Lobe Centerline: 108 BTDC: Lobe Separation Angle: 108 Overlap: 76 Intake Opens: 38 BTDC: Exhaust Opens: 74 BBDC: Intake Closes: 74 ABDC: Exhaust Closes: 38 ATDC: Intake Lift.508" Exhaust Lift.508" Note: 242 @ .050" (Herb McCandless) Note: as installed on 108 centerline per Chrysler . cheatham wrote:I've been wondering what the advantage is to a wide lobe center, say 112 vs 110 or 108 ? Shorter power band. Simply put, the lobe center of the camshaft controls where the power curve is applied. The 108 would make its power higher in the rpm range while a 112-114 would make . If you can only use the factory computer we can grind the cam to 114 degrees Lobe Separation Angle which would be easier to tune. = Moderately Wide 110-108 Deg. The lower the lobe seperation,, ie. The only reason the advance or retard a camshaft profile is to get the timing events where they need to be. Specs on the Comp Cam are 206/212 duration @ .050 .425/.440 lift 112 lobe separation 108 intake centerline. Lobe Separation Angle. The tighter the lobe center, the lower the RPM range; the wider the lobe center, the higher the RPM range. = Moderate 108-106 Deg. Shorter power band. = Moderately Wide 110-108 Deg. Builds Higher Cylinder Pressure. Sort of an antique grind today, a little lumpy but a reasonable idle. The intake lobe centerline is measured in crankshaft degrees. This has been my long time understanding! . 114 lobe separation angle (camshaft degrees)----- Exhaust valve opening = 79.5 BBDC . Mar 27, 2008. IIRC, peak HP was 470 with the Ford dual plane. With its engineering expertise, advanced technologies, and industry-leading manufacturing facilities and techniques, Speed-Pro sets the bar higher for other manufacturers of pistons, engine bearing parts, and performance engine components. The differance between 112 and 114 is not a whole lot but enough to different. In contrast, a smooth-running performance street engine might use a lobe separation . 104 lsa=more bottom end, 108 lsa=best all around, 110 lsa=more top end . Valve Lift with Factory Rocker Arm Ratio and get Free Shipping on Orders Over $99 at Summit Racing! Only 10" vac idling @ 1000 rpm; The motor had difficulty passing the smog idle test. LSA =LOBE SEPARATION ANGLE LSA is ground into the cam during manufactured, and can,t change, LOBE SEPARATION ANGLE Above 114 Deg. The motor switched on @ 2200 rpm and was all done by 5600. What happens when you change ONLY the LSA of the cam and keep the lift and duration the same? The 108-degree cam (blue lines) outperformed the other two, but. TICKET 23438 The lobe separation angle of a camshaft is often determined by the engine's purpose, its displacement and its compression ratio. my cam is Clay Smith Camshaft, 264 int 274 exh, 110* lobe separation, .450 lift, any insight that I can do to determine my findings are correct would be very aprreciated . The tighter LSA does have more overlap. Talked to . If you hear someone else is using a cam with 108 separation, don't think that you should use cams that only have 108 separation! mech/ dur @ .050" adv. "It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open." Mar 27, 2008. Jan 21, 2009. Why is all this important? A google search on this: Google":2lu42eo6 said: A cam ground with a 108 lobe separation and advanced 4 degrees will have a intake centerline of 104 and exhaust centerline . LCA lobe center angle, can be changed. A narrower LCA will increase valve overlap and close the (intake) valve earlier, which explains the typical rougher idler and more midrange behaviour. valve lift lobe sep power lifter below . 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. FULL RESULTS-CHANGE ONLY LSA-LS CAM TEST. The second cam with the 110 lobe separation would give you more of the "lopey" idle you are looking for. Moves Torque to Lower RPM. decal and spec sheet included. A 112-114 degree lobe center will have a better idle and produce more vacuum with less overlap. mc2201 hyd 2 204 214 278 288 .420 .443 110 110 1500-4000 smooth 817 c comment: good for computer controlled engines . = Wide 112-110 Deg. that. By widening the lobe separation angle, this will automatically retard the intake lobe centerline and increase the piston-to-valve clearance. it uses the 112* lobe sep to stretch the power to 7,000 rpm's. 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. LOBE SPECIFICATION CHART HYDRAULIC, HYDRAULIC ROLLER & SOLID LIFTER (EXPANSION TECHNOLOGY SERIES) TYPE OF CAM Track; HWa CtE'.yV-8 Base Circle 302 HO Track; . For instance the old PS truck motors. As an example my winter refresh which included a .5 increase in compression and cam change to one with a 109 LSA vs a 112 and a fairly serious increase in .200 duration netted about 160 HP with .050 duration figures that changed less than 2 degrees. I ran a 238@ .050 cam from Hughes on a 108 LSA in my first 500 stroker and it was TOO small, ran like crap. for a given engine, there is an ideal lobe separation angle that works best over a relatively wide range. Does LSA change power. A cam's lobe separation determines where and for how long peak torque occurs in an engine's rpm range. = Moderate 108-106 Deg. The tighter lobe sep will turn less RPM and will help build compression. MASTER S.50E4 s-99+10 s-598 ZM-89 s-293 $302 s-364 s-336 s.344 9346 s-650 s-643 s-574 s.564 s-550 With racing cams, you will find lobe separations that range from 106 to 108 degrees. Wider LSAs tend to give a broader and flatter torque curve, with good street manners, a strong vacuum signal and a smoother idle. The tighter the lobe center, the lower the RPM range; the wider the lobe center, the higher the RPM range. The lobes on those 2 cams are the exact same lobe just a wider lobe sep. AFR head flow really well, and if you have back pressure that can translate to reversion issues at low rpm with a tight LSA, and a power loss. Camshaft: Hydraulic Roller, Comp Cam custom grind (ADV Duration 281-287,@ .050 230-236, lift 622I & 625E w/1.6 rockers.) Lobe Separation = (Intake Centerline + Exhaust Centerline)/2. Same go's for the 68-200 and 68-201. 5870 Dale Street Buena Park, CA 90621 Phone: 714 523-0530 714 522-3301 800 454-7999 Speed-Pro is the go-to brand not only for racers and performance enthusiasts but also for those who are cruising down the road day in day out. 110-112) results in a broader, flatter torque curve that is more suited to automatic transmission cars with fewer gears from which to choose. Separation, just like centerline, is another way . The 3.42 gear from the same Quick Performance is just $108 Difference is cruise rpm @ 60 mph between 3.55 and 3.42 is 105 rpm About . You want to go 110-112 degrees of lobe separation, which will give a broader power band and better idle. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open. 108* or narrower lobe separation angle (LSA) is "Narrow" and 114* or wider (up to 117* or 120* for stock cams) is "Wide" , with 110 to 112* being the "normal" hot-rod cam. Again this is dependent on your shift rpm and assuming you truly have 14-1 compression. To create a vacuum signal, that stands a reasonable chance at working in an application without having to re-flash the ECM computer, a camshaft needs to be: A) Short duration, 220-222 degrees @ .050? It's the scavenging effect of the high velocity exhaust gases rushing out that pulls the fresh fuel/air charge into the chamber. Idle Vacuum is Reduced. In the same way 112 LSA has the same effect on a 351C 4V as the effect a cam with . The lobe separation angle is the angle in camshaft degrees between the maximum lift points, or centerlines, of the intake and exhaust lobes. It depends on the combination of engine size, head flow and head flow balance, as well as a big one, exhaust flow capabilities. B) Wide lobe separation/centers, 112 to 114 degrees minimum. So, a 108 lobe separation means the intake and exhaust lobes are 108 degrees apart from each other on the cam shaft. After all, the valve timing events have to occur at the most advantageous moments to glean the desired results from an engine combo. The #1 intake lobe centerline is usually between 100 The following illustration demonstrates why: TeCh Tip Lunati recommends replacing lifters with most roller and all flat tappet camshafts that we sell. EDC said: 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. A Strip Dominator made 15 HP more. Specs on the Crane Cams 2030 are 204/214 @ .050 .423/.446 lift and 110 lobe separation. = Extremely Wide 114-112 Deg. Ed. 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 It has a intake duration @.050 262 ex. eg cam with 110LSA like the old High energy competitions cams had intake centerline +4 ICL at 106 to find the exhaust centerline take lsa*2 = 220 then subtract the intake centerline. . but at the cost of less torque at low and midrange rpm. A street driven SBC for example likes a 112 to 114 lobe separation, unless is is running above the 9.5 to 10:1 compression range on iron heads then it would prefer a 108-110 lobe separation. It's interesting that all of the Mopar Performance cams have a 108* lobe separation angle. . Also diminished street manners and a lower vacuum and rougher idle. It is the angle that separates the intake and exhaust lobe for a particular cylinder, and is measured in camshaft degrees. Hot street camshafts usually have 110- to 112-degree LSA, while high performance and racing camshafts will often run between 105 and 108 degrees. 104 lsa = more bottom end power 108 lsa = best all-around power 110 lsa = more top end power. The differance between 112 and 114 is not a whole lot but enough to different. The dyno plot however, shows how different each cam really was. On a tight lobe separation, like 106-108 degrees, the engine will build torque quickly and reach its peak early. Roller 2000-5600. Lobe Separation: 108 LC Included Lifters: 91167 Hyd. BigBro74 wrote: "tighter" = smaller number, or in what you posted the 108 was the "tightest" lode seperation or lobe center angle. I'm running the P4529230AB cam with 256* in&ex advertised duration and .45" lift in&ex with no . 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. Find CHEVROLET Camshaft Kits 0.480 int./0.480 exh. CAM HELP, the industry's only toll-free valve train help line, is staffed by valve train experts with the experience and training to answer all of your questions. Lem Evans October 4th 2010, 7:43 pm. Also, the jump in manifold vacuum between the 104 and 110 grinds is pronounced, especially The lifter/lobe contact area is under a tremendous amount of pressure, and the lifter and lobe must establish a rotating pattern together. $150.00 custom cam. A narrower LSA gives more peak torque at the expense of bottom end torque in comparison. If you have an average exhaust I would run a 110 with that duration,if its an excellent exhaust then I'd look at a 108. The RPM location of the peak power will remain about the same as long as the duration at .050" on the intake lobe remains the same (curve "D" vs. curve "E") Advancing and Retarding the Camshaft: Advancing the camshaft, (a lower intake lobe center line number, 104 vs.108 for example) will tend to start the power band sooner in the RPM range. The 565 uses the 4.25" stroke to make trq. I think you are asking a lot of a cam with a rough idle and power band starting at 1,000 RPM. If you shift at 7500-7800 add 4-6 degrees to both intake and exhaust and spread the lobe separation to 108-110. Lobe Separation Angle: 115 Overlap: 27 . The lobes on those 2 cams are the exact same lobe just a wider lobe sep. 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. The original cam offered a 108-degree LSA while this new low-shock cam would probably best be spec'd with a 110- to 111-degree LSA. Good idle, off-road & street performance. Intake Lobe Center (degrees): 108 Exhaust Lobe Center (degrees): 105 (small core exhaust)-110 (big core/meg/OOF) . A wide lobe seperation is not always better than a narrow one, or vise versa. it uses the 112* lobe sep to stretch the power to 7,000 rpm's. 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. Do not attempt to install a camshaft with a 108 lobe separation in a fuel . Lobe Separation Angle, or LSA, is the number of degrees that separate the peak lift points of the cam's intake and exhaust lobes. Simply put, the lobe center of the camshaft controls where the power curve is applied. 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. the specific numbers (durations, lobe separation angles, etc) are not where the trends lie. It also depends on what the vehicle will be used for and if economy and vacuum are important. 9.0:1 CR advised. 110 + 4 means that the Lobe Separation Angle is 110* and the cam shaft has 4 degrees of advance built into it. 110 LSA, 110 ICL. Save. Lobe centre angle (Intake): 106 (Exhaust): 110 Lobe separation angle: 108 Lift on overlap: 0.036" Accuracy: Good The next in the Swiftune family is the SW10, which is basically a real hot road cam like a 286 but with better emissions and suited to road use where wear characteristics are more important than outright performance. Source: Comp Cams www.compcams.com I went from a 110 LSA can to a 108* LSA cam recently and I can tell a definate difference when the engine "comes up on the cam" at 2500 RPM or so. CHEVROLET Howards Cams 110525-12 Howards Cams Retrofit Hydraulic Roller Camshafts | Summit Racing . The only difference between the two seems to be in the lobe separation angle and the degree of advance built into the cam; the RPM cam uses 108 degrees lobe separation, and 5 degrees of advance built in, whereas the Comp uses 110 lobe separation and 4 degrees of advance built in. Camshafts for mid-range performance typically have 110 to 112 degrees of lobe separation. Increase Effective Compression. It's not astonishing to us that lobe separation will have a big impact on performance. With a 108 degree lobe center, a cam will have a rougher idle and produce less vacuum due to more overlap. CAM HELP is available from . = Extremely Tight VARYING LOBE SEPARATION ANGLE . 434 Posts . 114 LSA would be narrow, yet a 360 SS motor would die with a 114 LSA because the exhaust is way too . 108 versus 110 will drive the power band down. Idle Quality Suffers. Meaning the lower lobe seperation will have a very quick and fast powerband (Snappy!) A cam with a 112 lobe center will idle smoother than a cam with a 110 lobe center. 108 lobe separation That cam made peak horsepower in the 5500 to 5600 RPM range. LSA =LOBE SEPARATION ANGLE LSA is ground into the cam during manufactured, and can,t change, LOBE SEPARATION ANGLE Above 114 Deg. . . Should have good exhaust, 2500+ stall & 9.5:1 CR. 108 degrees Lobe Separation Angle - 110 degrees _____ Wade Cams . = Wide 112-110 Deg. and. This ideal LSA is primarily a function of cubic inch displacement (CID) per cylinder per inch of valve diameter, as well as compression . I have also been told to bump the cam up by a couple sizes with the stroker as it will eat up some duration. Increase Cranking Compression. If you want a lumper idle go with a cam with 108 LSA, the tigher the LSA the idle will be rougher. No, it is not even close to the ultimate performance grind most would have picked. GRIND #: CRB3 3194 /3196 HR111. Check for Availability: Increases Maximum Torque. = Extremely Wide 114-112 Deg. The reasons can be many. The tighter lobe sep will turn less RPM and will help build compression. A cam with a 112 lobe center will idle smoother than a cam with a 110 lobe center. hardface welded! = Moderately Tight 106-104 Deg. The peak torque was 486 ft-lbs. More over-simplifications: I had flat tops with Edelbrock heads . exhaust .050 37 cfm .100 67 cfm .200 109 cfm .300 135 cfm .400 161 cfm .500 169 cfm .600 162 cfm Increase Chance of Engine Knock. Save Reply 1 - 8 of 8 Posts The following are some tips for selecting the proper cam for circle track applications. If the heads have limited flow usually a . This advance of 4 degrees would shift the powerband of the cam . 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. #1. Only show this user. . . LSA lobe separation angle is locked into the cam when its ground and can not change, if its ground at 110,degrees or 114 degrees it will stay that figure. mc11350 mech 5 261 271 296 306 .680 .680 108 centerline 3500-6500 very rough at6028ra comment: steel, requires bronze distributor gear . On the cranking. Intake Open / Close: 25 btc/61 abc Exhaust Open / Close: 63 bbc/23 atc (at 110 lobe center) Lobe Separation Angle: 109 Overlap: 48 Comments: Drag race cam, HD springs required. http . 226 .493 .512 lift on a 111 lobe separation angle. Tim05GTO said: Assuming all else being equal you would have more overlap (where the exhaust valve is closing and the intake valve is opening) with the 110 + 4 than the 114. I would say 114-117* would be a normal 1960's stock cam range. The 565 uses the 4.25" stroke to make trq. A cams Lobe center angle equals intake centerline plus exhaust centerline divided by two. LSA: 110 (Dan's revised LSA recommendation was 108, but my cam grinder pushed for 110) .