thanks. Introduction. Not a HUGE, but a significant difference between 110 and 112, but those are the trends. Coupled that with the low first gear of the five speed, it ought to create some real traction problems. by mrsmythe Tue May 13, 2003 5:45 am, Post Contributions la connaissance de la flore du Maroc et de l'Afrique du 110 LSA: On the contrary, 110LSA has a higher piston-to-valve clearance rate. from the intake to the exhaust and vise-versa.Thats why a performance cam will usually have a rougher idle than a stock one. Lobe Separation Angle, or LSA, is the number of degrees that separate the peak lift points of the cam's intake and exhaust lobes. Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. Ultimately, it makes the 110 LSA an oil-consuming LSA. 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. Changing lobe seperation from 110 to 112-14? | For B Bodies Only Depending on the engine combination, the opposite results can occur. I'm surprized at these questions as well as some of the replies. " LCA (lobe center angle) vs LSA (lobe seperation angle) On engines equipped with independent intake and exhaust cams, the LSA is adjustable. 106 LSA: As the 106 LSA is a tighter LSA, it fails to generate maximum power. 10 Tuning the timing curve and fuel from the 42-lb/hr FAST injectors was handled by this Holley HP management system. 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. Thanks again. Like one cam is 112 degree and the next is 108 the 108 cam will allow less "leakage"? I bet you won't see a bit of difference. Either learn to fix it, or learn to write checks. 108 is very tight producing lower vacuum and more of a 2 stroke "punch" powerband. The Wastegate works by releasing the pressure built inside, Read More What Are The Wastegate Stuck Open Symptoms?Continue, Oops! According to the Comp Cams catalog, "The lobe separation angle (LSA) is equal to 1/2 the angle in crankshaft degrees of rotation between the maximum exhaust valve lift and maximum intake lift.". A Pro Stock engine builder may prefer a wide LSA to help keep the power from breaking traction tOo early. Full text of "Pediatric Books" It really comes down to the application. Increased overlap improves upper RPM power. How to Choose a Camshaft for Street Vehicles - OnAllCylinders 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. - Sheryl Crow. 106 LSA: There is a scale of standard cranking compression of the engine. If all the specs remained the same what will going from a 110 to a 112 lsa do to driving characteristics? 04 Minor modifications to the factory windage tray were necessary to work with the new stroker assembly. 01 Choosing the right lobe separation angle for your LS cam shouldn't cause anxiety. 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. Realize what the engine is going in, however, as you may not be able to use the wildest cam out there. 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 On a tight lobe separation, like 106-108 degrees, the engine will build torque quickly and reach its peak early. Disorganization of language and working memory systems in frontal I have Crane hydraulic link bar style roller lifters, so I dont have to use the spider style. That notion is completely false. 114 lsa cam sound clips | LS1LT1 Forum The 114 cam will give more low end torque, good midrange, less power up high. http://www.mustangworks.com/cgi-bin/moi-display.cgi?220, http://www.popularhotrodding.com/en6em_camshaft_specs/lobe_seperation_angle.html. I have 108 for LSA and my headlights take awhile to go up when the car is idling. Icao Annex 10 Aeronauticaltelecommunicationsvolumeiv-Surveillanc 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. 110 LSA: However, if you look at the rate of cranking compression at 110 LSA, you will find a reduced compression rate from the standard cranking compression PSI level. 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. Also present during testing was a set of 1 7/8-inch Kooks headers, Comp hydraulic roller lifters, and F-body oil pan. 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. I would have to say that your cam choice sounds like a winner to me. lobe separation angle | For A Bodies Only Mopar Forum Defining Lobe Center and It's Importance to Engine Performance: A Blog. Higher overlapping lets less oil fall through the oil inlet. A wide lobe seperation is not always better than a narrow one, or vise versa. Knife edged & profiled 4MA Cleveland crank weighing 50lbs. Known as "The Gladiator" around Westech Performance, this Dart SHP blockbased, 370ci, small-block Chevy has made thousands of dyno pulls testing all manner of heads, intakes, cams, and every other crazy thing us magazine folk have coerced Westech's Steve Brul to bolt to it. In a blower motor when the valve timing events are where they need to be the lobe sep will usually wind up in the 114-115 range on most Combos. 108 Lobe Separation These are my motors specs 1979 - 347 Stroker 10:1 Compression Holley 670 Street Avenger or a Holley 650 (I have both) Roush 200 Cylinder Heads (minor head work) 1.6 Roller Rockers Shorty BBK Headers 373 Rear End 5 Speed Transmission Cross Gap Intake (Power Band 1500-6500) FlowMaster Dual Exhaust (of course no Cats) MSD 6Al 110 LSA: On the contrary, at 110 LSA, the engine fails to reach the maximum torque, resulting in a decrease in torque rate. Howards Cam Vs Comp Cam: Which Is The Best Option For You? Equipped with the 120-degree (LSA) cam, the hybrid stroker produced 570 hp at 6,200 rpm and 535 lb-ft of torque at 5,200 rpm. its got a 3.73 posi and the Stock 4 speed with a very low 3.42 1st gear. While a cam with a 108 lobe center will idle rougher. Your email address will not be published. Lobe Separation Angle. - 332-428 Ford FE Engine Forum I've seen a few comments in threads on here that have said things like "going to the 112LC from the 108LC gives 4lbft more torque at the bottom and 2bhp more at the top" yet this would seem to go against what webcam say on. 12 In terms of power production, the stroker LS3 performed best with the tightest lobe separation angle. The ported heads were capable of supporting over 700 hp, so we knew they would not be restrictive on our stroker. So, this LSA is suitable for your engine and its components. 08 Additional components used to build the stroker included a set of Comp hydraulic roller lifters, ARP head studs, and a new oil pump. I think the compression ratio has something to do with LSA too. . The only reason the advance or retard a camshaft profile is to get the timing events where they need to be. Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. . 4-Link72, do you run racing gas or pump with 10.5:1 CR? Post Copyright 2022, S&S Motorsports LLC, All Rights Reserved - Powered by, http://www.webcamshafts.com/cam_glossary.html, http://www.newcovenant.com/speedcrafter haft/3.htm, Webcam 86A 108LC w/1.5 vs 86B 112LC w/1.3s. This causes the engine's street manners and tuning to become fickle. 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. But remember, although a broader powerband has a couple of acceleration advantages, it also comes with a few drawbacks. 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. When degreeing in the camshaft, you are making sure the intake centerline is precisely where the cam is intended to be. What do you think of this cam choice? | Chevy Nova Forum Cam ???? Same Cam 112 vs. 114 Sep., What happens? It is the DESIGNED events that yield CENTERLINE. Thanks for the replies so far. This cam also offered the highest torque output at 4,000 rpm with 522 lb-ft. Based on the peak numbers alone you might be tempted to grab the one with the tightest (108-degree) LSA, but there is more to a cam test than power. The exhaust has an opening even and a closing event. Simply put, the lobe center of the camshaft controls where the power curve is applied. 15,215. ohio. Mike Magda is a veteran automotive writer with credits in publications such as Racecar Engineering, Hot Rod, Engine Technology International, Motor Trend, Automobile, Automotive Testing Technology and Professional Motorsport World. Camshaft Kits - 108 Lobe Separation (degrees) - Summit Racing The power and torque curve lay directly in between the last two cams, as did the peak horsepower and torque, 488.7 at 6,200 rpm and 487.1 at 4,600 rpm, respectively. Pretty much standard for an RV type cam. by Hoxviii Mon May 12, 2003 7:50 pm, Post The article was called "Separation of Power" and they tested 5 cams ranged from 106 to 114 LSA. On larger displacement units 116 to 118 degrees of separation are common. turbo camshafts lobe centers and lobe separation A lower efficient compression rate leads to a higher fuel consumption rate by your engine to produce higher power. Camshaft Lobe Separation Angle | Classic Car Restoration Club 1-4 It is one of the most common neurological disorders worldwide, 1-5 is among the most common . 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 ratio.A lot to swallow I know,hope this helps you. 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. 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. In reality, a cam with 220 at 0.050" and a lobe center angle of 112 will have the exact same mechanical overlap as a cam with 217 at 0.050" and a lobe center angle of 109. 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. Every spec is a road map to what the valves are doing, the most common of which are lift, duration, and lobe-separation angle (LSA)the latter needing the most explanation. 554"/577" lift. 238/248 duration, 300/310 adv. Tests 2 and 3 meant dissecting the motor on the dyno to get the old cam out. The valve covers, valvetrain, intake manifold, harmonic balancer, front cover, timing set, and cam were yanked. The intake lobe centerline is measured in crankshaft degrees. Fixing the ignition coils is essential when you experience issues like engine misfire and the Check Engine light that wont go off. On the cranking compression test, Brul recorded 175 psi, a 10-psi drop from the outgoing 101 cam. Aeromotive; 913.647.7300; AeromotiveInc.com, AFR Heads; 661.257.8124; AirFlowResearch.com, Federal Mogul/Felpro; 248.354.7700; FederalMogul.com, Mahle; 248.347.9700; Mahle-Aftermarket.com, Scat Enterprises; 310.370.5501 ScatEnterprises.com, SuperFlow Dynamometers and Flow Benches; 515.254.1654; SuperFlow.com. 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. 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. That means your engine can produce more power with a minimum amount of fuel combustion. 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. Ed JTO learn to park Joined May 31, 2009 180 Posts 4-linked72, what cam are you using that has a 108 LSA? But, you may wonder knowing that a higher valve clearance rate reduces the chance of damaging the valve by the piston. The lobe separation angle is the angle between the two camshaft lobes that act on the valves. Required fields are marked *. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Disclaimer: Remember to always consult with an expert first before trying anything at home. Wide LSA cams are also applicable in forced-induction applications where less exhaust overlap is required. pump gas, no additive's as well, runs good, i will put the highest octane in, which is 93.. The stock valvesprings supplied with the CNC LS3 heads were swapped out in favor of a set of dual springs from Brian Tooley Racing. Save my name, email, and website in this browser for the next time I comment. It produces peak torque earliercoming on quicker and strongerbut also it falls off quicker too. 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. Powerband serves a massive contribution to the acceleration car. Well, I saw that Erson makes some nice hydraulic rollers with 108 LSAs, and I know that tighter LSAs have more midrange, so I thought they might be worth a try. What Is the SBC Header Bolt Torque? Idle quality was rough and the vacuum gauge showed only 9.8 in-Hg (inches of mercury). Myoinositol reduction in medial prefrontal cortex of obsessive Armed with more information on camshaft theory, what will you build? This is very critical for manifold vacuum, throttle response, emissions, and gas mileage. It may not display this or other websites correctly. too much for the street? 106 lobe sep. in a street car. | NastyZ28.com
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108 vs 110 lobe separation