As the RPM's go up this is not as critical as the higher velocity of the air/fuel moving thru keeps it from getting contaminated. But, after comparing these two LSA based on a few mechanical aspects, such as maximum Torque, RPM, powerband, oil consumption, and many more, you will find the 106 LSA with better performance output. "It's not having what you want, it's wanting what you've got!" If it occurs too late, it will lean out the cylinder and greatly hinder the performance of the engine. It's wet flow tested at 690cfm. 02 The 402-inch stroker short-block combined an aluminum LS2 block with a 4.000-inch crank and 6.125-inch rods. by Kdub Sat Dec 06, 2008 11:05 pm, Post Idle vacuum showed a considerable spike to 14.7 in-Hg, likely the difference between being able to run power brakes and a mandatory leg workout. The engine will have weak performance in the low-end range.A low vacuum can also cause the brake pedal to be quite difficult to press. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. A cam with 110 lobe center will pull approximately 14-18"of vacuum is borderline for that type of application. Save Share. by lazaris Fri Dec 12, 2008 2:18 pm, Post 08 Additional components used to build the stroker included a set of Comp hydraulic roller lifters, ARP head studs, and a new oil pump. According to the Motortrend, LSA (Lobe Separation Angle) is a wonderful approximation of the operation of the engine because it takes into account the relative time of the intake-valve events (intake opening, intake closing) and the exhaust-valve events (exhaust opening, exhaust closing) concerning each other.Above mentioned sequential activities allow LSA to be an accurate representation of the operation of the engine. 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. by Paul H Tue May 13, 2003 1:24 pm, Post To overcome this inherent problem in wide LSA camshafts, you simply need a higher-flowing intake port. I'm sorry to disagree with that incredibly well written article, but lobe separation by itself is absolutely freaking meaningless. But to choose the perfect cam, all of that information needs understanding. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open.. But, at 106 LSA, the cranking compression may increase above the standard PSI level. As lobe seperation spreads does the powerband. Do you know what the best lobe separation angle for your car engine is? The tightest LSA (101) was worth 21.5 lb-ft of torque and a much broader powerbandat the cost of much lower idle vacuum, which would make it more temperamental in a street car. Knife edged & profiled 4MA Cleveland crank weighing 50lbs. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. The 108 LSA offered the lowest idle vacuum of the three (down 4 inches). The intake lobe centerline is measured in crankshaft degrees. = Moderately Tight 106-104 Deg. 4-linked72, what cam are you using that has a 108 LSA? A few other major and, Read More Heres What Causes Your Car to Bog Down When AcceleratingContinue, Your email address will not be published. 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 lobe separation angle is the angle between the two camshaft lobes that act on the valves. A wider lobe separation angle can often provide more power, but it can also lead to more wear on the engine. If you take any of the . Lobe Separation Angle, or LSA, is the number of degrees that separate the peak lift points of the cam's intake and exhaust lobes. A cam 112LSA with 4 degrees advance puts the intake centerline at 108 degrees. by xstfudonniex Sat Dec 06, 2008 4:21 pm, Post I also like the 106 lobe separation with the intake on 103. 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 by jim martin Mon May 12, 2003 7:10 pm, Post Its also critical that valve overlap is kept to a minimum as the induction system can create a suction that pulls water into the motor, adds Bolander. As you can see in the graph, the 101 LSA cam actually had the highest cranking compression of the batch: 185 psi. I would have to say that your cam choice sounds like a winner to me. 03 The 4.000-inch crank and 6.125-inch rods were combined with a set of forged asymmetrical pistons from JE. It is possible to advance and retard the timing events, but the distance between the centerline of the lobes will remain constant. Pretty much standard for an RV type cam. A tighter LSA is always going to have more overlap, which allows the exhaust and intake systemif they're tuned wellto work together.". "Ninety-nine percent of cranking compression is dictated by static compression ratio and intake-valve closing point," said Comp Cams' Billy Godbold. 110 will be a bit punchier in the midrange and probalby make a little more peak horsepower as long as a good exhaust is used. 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. This table will create a map in your head, and I bet it will make your understanding crystal clear. I'd run it, just be sure to check valve to piston clearance, coil bind and retainer to guide boss/seal clearance. Well, there can be different reasons for this problem. A 112 LSA would be better if I had an automatic, but the engine builder (who has built many, many drag racing engines)told me I would have much faster acceleration with the 108, at the expense of a broader power band of course, but that 108 would not unduly penalize me for the street. A cam with a 112 lobe center will pull approximately 16-20" of vacuum, which is good for power brakes. My duration will be about 230 degrees. 106 LSA: At this LSA, the car machine has to confront the reduction of idle vacuum rate quite often. Coupled that with the low first gear of the five speed, it ought to create some real traction problems. The custom cams we selected all featured 0.624-inch lift (both intake and exhaust) and a 232/242-degree duration split. The valve covers, valvetrain, intake manifold, harmonic balancer, front cover, timing set, and cam were yanked. Kevko baffled oil pan & Milidon windage tray. For any additional clarification or questions please contact our Tech Line at 714 523-0530. https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s. 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. Pretty much standard for an RV type cam. Moreover, a user from the Chevelle forum said. Most street cams are ground 4 degrees advanced which boosts bottom end, throttle response, vacume, mpg driveability etc. Walter Noah is a process engineer who has a knack for resolving even the toughest technical issue. Aluminum flywheel & pullies. Cam and Lifters, Hydraulic Roller Tappet, Advertised Duration 282/288, Lift .589/.600, Chevy, Big Block, Kit. JavaScript is disabled. Also know as Lobe Separation; Lobe Center is simply the distance between the peak opening points on the Intake and Exhaust lobes. I am pretty sure, right now, you find yourself in the middle of the rising debate of 106 vs 110 lobe separation angle. The 402-inch LS2/LS3 hybrid stroker started out with an LS2 aluminum block. 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. For a better experience, please enable JavaScript in your browser before proceeding. Simply put, the lobe separation angle (LSA) is a measurement of how the intake and exhaust lobes are phased with each other. Performance Distributors Keeps The Spark Alive With SOS, A New Diesel Piston That Increases Power And Reduces, Shop Tour: Brian Tooley Racing Expands To Be A One-Stop, Melling Offers New Timing Kits for Ford 4.6L and 5.4L SOHC, Reborn Retro Blower Packs Positive-Displacement Power For Fox, EngineLabs Tool Of The Month: Summit Racing Lb-In Torque, Why You Should NOT Emissions Delete Your Diesel, Can A Cold Air Intake Really Help Your Trucks, Ask The Expert: We Want Your Questions For Canton Racing, The Answers: DeatschWerks Responses To Your Fuel System, SEMA 2022: GEARWRENCH Leveled Up With Distinct Quality Hand, EngineLabs Tool Of The Month: Summit Racing AN Wrench, HOLY SHIP! The Fora platform includes forum software by XenForo. 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. LSA CAM TEST-108 vs 112 vs 120 Richard Holdener 239K subscribers 168K views 2 years ago WESTECH PERFORMANCE GROUP FULL RESULTS-CHANGE ONLY LSA-LS CAM TEST. So, sit tight back and explore. This form of short-term memory is supported by the prefrontal cortex (PFC) and is believed to rely on the ability of selectively tuned pyramidal neuron networks to persist in firing even after a to-be-remembered stimulus is removed from the environment. I believe you have got the idea of what you were seeking. And better gas mileage. The 110 is probably a better choice for a performance street engine. Another difference between the two involves the power curve. When choosing a cam, power gains shouldn't be the only consideration. (ICL + ECL) / 2 = LOBE SEPARATION ANGLE (LSA) LSA is a RESULT of the PROPER events. 110 LSA: On the other hand, 110 LSA is a wider LSA with almost no overlap. The 290 advertised duration and 114 lobe separation would contribute to a lazy power curve. Really wide lobe separation angles are used in boosted applications. You must log in or register to reply here. Realize what the engine is going in, however, as you may not be able to use the wildest cam out there. However, a cam with 108 will only pull 12-16", which is not enough for power assisted accessories. You get a better idle, vacuum, and response from a 112o-114o lobe. I don't know about 13 to one but I have seen 12 to one on a 350 chev in hot rod article, BUT the guy soft petals around on the street with no full throttle use and puts racing gas in at the track. JavaScript is disabled. Well, it is quite a natural event that you may not find the lope separation angle mentioned at the engine body. A mobile functional near-infrared spectroscopy (fNIRS) was used to record cerebral oxygenation signals in the left prefrontal cortex (LPFC), right prefrontal cortex (RPFC), left parietal lobe (LPL), and right parietal lobe (RPL) and analyze the EC of the cerebral cortex. Also If you go with 112 lobe centers, you create less valve overlap which will increase your compretion. This wave tuning is what helps performance engines achieve volumetric efficiencies of more than 100 percent. But it also has a lot of lobe separation. 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. For a better experience, please enable JavaScript in your browser before proceeding. On the cranking. 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Powerband serves a massive contribution to the acceleration car. The lobe separation angle is the angle in camshaft degrees between the maximum lift points, or centerlines, of the intake and exhaust lobes. If you look at any given cam catalog, you will find that the majority of street-oriented cams fall in this range. Only once the intake valve has closed can compression begin to build. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. The introduction of Lunati'snew Bootleggerhydraulic series - with its wicked 108-degree lobe-separation angle, fast opening profile and plenty of area under the lift curve - will serve only to fuel the flames on this heated bench-racing topic. Increased overlap improves upper RPM power. A cam with a 112lobe center will idle smoother than a cam with a 110lobe center. 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. lobe centers and lobe separation are 2 different things . camshaft is a Cranecams F238. I had a 110 cam in my beetle and I didn't like it-the bottom end was doggy. O onovakind67 Registered Joined Dec 14, 2001 6,242 Posts by SStrokerAce Sat Dec 06, 2008 7:36 pm, Post Chevy Transmission Wont Shift Into 3rd: Finding the Main Culprit, Yamaha Lower Unit Drain Plug Size [Explained Everything], Does It Matter Which Ignition Coil Goes Where? 110 LSA) and Crane's #341191 (238/248, .563"/.587", 114 LSA), display considerably different characteristics. by SStrokerAce Sun Dec 07, 2008 12:22 am, Post Our content is merely suggestive, not intended to use without proper safety precautions and advice. It made 472.4 lb-ft at peak, a 21.5lb-ft disparity from the 101 cam. Split duration/lift only helps when your intake/exhaust ratio is low on the exhaust side. True enough, the tight LSA improved power through the entire rev range, from 3,600 to 6,500 rpm, but the extra power came with a penalty in idle quality.

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