Test 1 was easy. Some of the programs like engine analyzer pro and dynomation seem to like some of the wider lsa's.Thanks again JOE. You can research your heads to find out where yours are, but honestly I don't think it will be worth the effort on a tow vehicle. any input is appreciated guys, thanks. Post Howards Cam Vs Comp Cam: Which Is The Best Option For You? Our content is merely suggestive, not intended to use without proper safety precautions and advice. Let's just talk lobe sep angle. by lazaris Fri Dec 12, 2008 2:18 pm, Post And better gas mileage. We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. With a 108 degree lobe center, a cam will have a rougher idle and produce less vacuum due to more overlap. 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. by MELWAY Sat Dec 06, 2008 4:18 pm, Post However, in application, there is a lot more to consider. Re: Lobe separations on 383-406 cids.104-106-108-110. 4 Impaired episodic memory and semantic knowledge are common in TLE, although dysexecutive traits . by SStrokerAce Sat Dec 06, 2008 7:36 pm, Post by jim martin Mon May 12, 2003 7:10 pm, Post Lobe separation angle does. Introduction. 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. 106 LSA: 106LSA results in a decrease in piston-to-valve clearance. ~These are just some of the drawbacks weas guys who like to go mach 10 with our hair on fire and these little motors screaming at rpms that make other guys cryhave to deal with.~. Cam timing plays an important role not only in the power generated but also the overall character of the powerplant. To overcome this inherent problem in wide LSA camshafts, you simply need a higher-flowing intake port. When you don't have any overlap, you can't have any wave tuning. A few other major and, Read More Heres What Causes Your Car to Bog Down When AcceleratingContinue, Your email address will not be published. You must log in or register to reply here. More over-simplifications: Retarding the camshaft (a higher intake lobe centerline number 108 vs. 104) will generally start the power band later in the RPM range and decrease the cylinder pressure. It made 472.4 lb-ft at peak, a 21.5lb-ft disparity from the 101 cam. 09 All testing was run through a set of 1 3/4-inch long-tube headers and 3-inch exhaust. Split duration/lift only helps when your intake/exhaust ratio is low on the exhaust side. Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. Another important measurement was the torque production at 4,000 rpm and this cam checked in with 484 lb-ft of torque. Given that nitrous works best in the mid- to upper-rpm range, nitrous-powered engines need a wider lobe separation, like 112 . The valve covers, valvetrain, intake manifold, harmonic balancer, front cover, timing set, and cam were yanked. I had a 110 cam in my beetle and I didn't like it-the bottom end was doggy. Either learn to fix it, or learn to write checks. It is possible to advance and retard the timing events, but the distance between the centerline of the lobes will remain constant. 106 LSA: At 106 LSA, the cylinder pressure is a bit higher. I am pretty sure, right now, you find yourself in the middle of the rising debate of 106 vs 110 lobe separation angle. Topping the short-block was a set of Chevrolet Performance CNC LS3 heads from Gandrud Chevrolet. I would have to say that your cam choice sounds like a winner to me. Epilepsy is a chronic noncommunicable brain (neurological) disorder associated with excessive neuronal activity and unprovoked seizures referred to as 'epileptic seizures' and sensory-motor deficits that cause neurobiological, cognitive, psychological, and social consequences to the patient. It creates an unsteady manifold vacuum condition that, on a fuel-injected engine, confuses manifold air pressure (MAP) sensors, making it hard for them to regulate fueling. Bad idea in my view. Tuning this cam would be slightly more difficult due to the reduced idle vacuum, but it is hard to argue with all the extra power. Ultimately, it comes down to how you want the engine to run, the car's intended purpose, and what you are willing to tolerate. But, the internal processings are much more complicated. The 402-inch LS2/LS3 hybrid stroker started out with an LS2 aluminum block. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. dur. that is why people running 112 or 114 lobe centres retard the cam ,that way the exhaust event is back were it was before .this helps in exhaust valve tempatures--anyway today i talked too barry who is the owner of shadbolt cams and we talked about cam lobe centres -he considers 108 centre quite narrow and for a very narrow power band operation ,with a 112 he figures with the carbs with straight & even runs at the valves there should be no noticable loss of low end power, a 112 lobe would be a great choice for a great street strip motor -better lower torque followed with a flatter rising torque curve as well as rpm range extended 500-700 rpm -. The wider lobe separation angle closes the intake valve later and reduces cylinder pressure, so that is where it's detonation resistance comes from. The Fora platform includes forum software by XenForo. Lobe Separation Angle "LSA "Jump to Latest Follow 1 - 17 of 17 Posts . But there is a drawback of higher cylinder pressure: higher cylinder pressure may sometimes lead to piston or piston ring problems. GRIND #: CRB3 3194 /3196 HR111. If the overlap phase occurs too early, it will create an overly rich condition in the exhaust port, severely decreasing the gas mileage. Some of the confusion on this subject comes from what the meaning of "bottom" and "top" is to the speaker, I suppose. It produces peak torque earliercoming on quicker and strongerbut also it falls off quicker too. Part Number: HRS-CL120325-08. Tests 2 and 3 meant dissecting the motor on the dyno to get the old cam out. I normally run a 106 to a 108 because I like the "hit" a tighter LC cam has when it come up on the came. The 112-degree cam produced peak numbers of 567 hp at 6,200 rpm and 540 lb-ft of torque while pumping out 511 lb-ft of torque at 4,000 rpm. The Fora platform includes forum software by XenForo. It has been tried in the VW business earlier, but then they gave it up because of problems with too high temperatures around the exhaust valve, causing them them to break. A forum community dedicated to hot rod owners and enthusiasts. i've heard of this being done something about the massive amounts of duration allowes gasses to disipate? Anybody do any real testing on LSA in a 3.75 stroke small block chevy?I have always used 104-106 and was thinking about trying a 108 or 110 design.I know there is a lot of variables but just a general opinion from any experts.This is for motor only no nitrous.600-640 HP engine combos.Much appreciated! The final cam was tighter still, with a 108-degree LSA. While a cam with a 108 lobe center will idle rougher. These numbers can vary a few inches one way or the other, depending on several other aftermarket factors and your individual engine specifications, so you may want to check your vacuum once the cam is installed. On a naturally aspirated engine, the lobe separation angle has an effect on whether the engine reaches peak torque a little earlier or later in the rpm range. Whatever you do, stay under 270 advertised duration and shoot for a 110 lobe separation. The absence of engine knocking ensures that your car engine is reasonably combusting the fuel. This overlapping has a direct influence on the oil consumption rate of the engine. My lift will be about .580" intake and exhaust, with about 230/236 duration with a 1.7 rocker ratio, utilizing a Jesel shaft rocker system. However, the plentiful exhaust overlap (31 degrees) meant there was lots of exhaust dilution at low engine speed and high vacuum. The first cam featured a wide 120-degree LSA, while cam number two narrowed the angle to 112 degrees. For a better experience, please enable JavaScript in your browser before proceeding. A cam with a 112 lobe center will idle smoother than a cam with a 110 lobe center. A cam with a 112lobe center will idle smoother than a cam with a 110lobe center. . LSA is a way of summing up the relative timing of the intake-valve events (intake opening, intake closing) to the exhaust-valve events (exhaust opening, exhaust closing) in relation to each other, and it's a great approximation of how the engine will operate. A wider LSA moves intake- and exhaust-valve events farther apart and creates less overlap, which hurts intake-wave tuning. The SAME can be said. 110 LSA: On the contrary, if you look at the powerband at 110 LSA, the powerband is comparatively broader. It is dangerous to be right in matters on which the established authorities are wrong. I think that cam had 110 lobe sep. Im loking at a summit cam with close to the same lift and duration #s but 114 lobe sep. When boost or nitrous are introduced, and engine builders contemplate choices between single-, dual- or reverse-pattern camshafts then the discussion gets muchmore technical. The result sounded wonderful, but it didnt rev as enthusiastically and it made 30 less horsepower than normal, says Lawrence. The taller lobe seperation will have a longer powerband but will have to rev higher to make the power than the lower lobe seperation! 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. 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. 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. Good cam for a lower rpm street engine. He also enjoys reading books a lot and his favorite author is Paula Coelho. And better gas mileage. 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! i have a 4 bolt 351C, stock bore, 10.5 cr with 351C Boss heads ,boss crank and rods. Usually, an old gas tank is responsible for a vehicle bogging down during acceleration. The only reason I . The 110o will make more power overall. 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. Not a HUGE, but a significant difference between 110 and 112, but those are the trends. These issues can often be worked through by an advanced tuner, but always present a challenge and compromise in tuning strategy. The Idles increasing vacuum improves the idle quality and the engines overall performance. I forgot to add that poor vacuum is not much of a concern to me because I have no power accessories. Simply put, the lobe center of the camshaft controls where the power curve is applied. Engine builders Chuck Lawrence, left, and Doug Patton. That is no accident. Lower cylinder pressure is advantageous for your engine. Moreover, a user from the Chevelle forum said. 106 LSA: There is an increasing chance of engine knock at the 106 lobe separation angle. If that accessory still does not assist the cam in producing enough vacuum, then as a last resort you can use a vacuum pump. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. 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. 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. The lobe separation angle in a natural car engine conveys a considerable impact, especially regarding the maximum torque. 68 Mustang, 306, AFR 185\'s, CI cam, FPA\'s, Bigs 650 DP, T5Z, 9" w/4.33's. Ed JTO learn to park Joined May 31, 2009 180 Posts Armed with more information on camshaft theory, what will you build? All testing was performed with an Aeromotive fuel pump feeding a set of 42-lb/hr injectors. = Moderately Wide 110-108 Deg.
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