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.". Camshaft: Hydraulic Roller, Comp Cam custom grind (ADV Duration 281-287,@ .050 230-236, lift 622I & 625E w/1.6 rockers.) Professionally ported & polished iron 4V head with titanium intake valves, stainless exhaust, titanium retainers & keepers & dual springs. 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. 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. Generally speaking, decreasing the lobe centerline angle increases overlap. "When you've properly tuned a performance motor, you create high- and low-pressure waves in the intake and exhaust that help cylinder filling," said Comp Cams' Billy Godbold. Frontal lobe epilepsy (FLE), the second most common focal epilepsy syndrome after temporal lobe epilepsy (TLE), is frequently drug-resistant and MRI-negative. Frankly cams with a 108-114 lca unless in the perfect combo you won't usually see more than 15hp and you won't really feel the difference except for either a peaky or broad power band. Like one cam is 112 degree and the next is 108 the 108 cam will allow less "leakage"? 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. 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. 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. My duration will be about 230 degrees. 110 degrees on the lobe separation angles. Defining Lobe Center and It's Importance to Engine Performance: A Blog. Things like idle vacuum, fuel economy, and tuning all factor into picking the right cam. A cam with a 112 lobe center will pull approximately 16-20" of vacuum, which is good for power brakes. any input is appreciated guys, thanks. A narrower LCA will increase valve overlap and close the (intake) valve earlier, which explains the typical rougher idler and more midrange behaviour. The lobe separation angle is the angle between the two camshaft lobes that act on the valves. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. A wide LSA reduces valve overlap, softens the idle and improves overall drivabilityespecially on the street where performance engines benefit from 112 to 114 LSA. I'm sorry to disagree with that incredibly well written article, but lobe separation by itself is absolutely freaking meaningless. That lopey idle that is universally loved, and part of the allure of a tight LSA cam, is actually misfire caused from a combination of exhaust dilution in the intake manifold and poor cylinder filling at idle. So, choose the perfect lobe separation angle for your engine, complying with the requirements of your needs. A cam with 110 lobe center will pull approximately 14-18"of vacuum is borderline for that type of application. you cannot just take a random change in a lobe separation angle and say 1 is better than the other. 106 LSA: As you know, the intake and exhaust lobes centerline distance is known as lobe separation angle. The 110 is probably a better choice for a performance street engine. The ported heads were capable of supporting over 700 hp, so we knew they would not be restrictive on our stroker. Consequently, decreased torque rate often leads to more energy consumption. That is why 106 LSA consumes less oil. Noah knows a lot about whats happening in the car industry with the latest piloting productions thanks to his professional experience. = Moderately Wide 110-108 Deg. Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. 4 Impaired episodic memory and semantic knowledge are common in TLE, although dysexecutive traits . Hey guys, can anyone tell me how rough of a idle a cam would be with a 108 lobe separation? 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. See all 14 photos 13 The three power curves indicate that the wide (120-degree). Lucky for us, Brian Tooley Racing stepped up with a dual spring package that allowed us to safely run our 0.624-lift cam. Wide LSA cams are also applicable in forced-induction applications where less exhaust overlap is required. = Extremely Tight . 106 LSA: At 106 LSA, the cylinder pressure is a bit higher. A narrow, more specific power band is also a product of a narrow LSA, as is a lumpy idle qualityoften referred to as the 106 sound. Making this the biggest obstacle to overcome when selecting a cam profile with one of our tech advisors, explaining the definition and importance of the Lobe Center. by jobes Sat Dec 06, 2008 3:51 pm, Post by Hoxviii Mon May 12, 2003 7:50 pm, Post A cam with a tighter LSA will require a looser torque converter, may not be able to run vacuum-assisted brakes, and doesn't play nice with fuel injection. How To Properly Replace Ignition Coils, Chevy 350 Ignition Coil Location And Everything About Them, Heres What Causes Your Car to Bog Down When Accelerating. 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. by farmer Mon May 12, 2003 3:14 pm, Post 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. So the wider LSA introduces a broader and therefore longer torque band.. If you changed the lobe separation of a street engine from 112 degrees to 106 and didnt do anything else, adds Kaase. On engines equipped with independent intake and exhaust cams, the LSA is adjustable. The standard bore block was then stuffed with a 4340 forged steel 4.0-inch crank and 6.125-inch rods, along with a set of flat-top, forged JE pistons. Idle quality was rough and the vacuum gauge showed only 9.8 in-Hg (inches of mercury). 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. Pinning the tail on the perfect cam can certainly be a difficult task. Thanks for the replies, particularly that link Marc, very informative. Come here to talk with others who like to drive fast. It made 472.4 lb-ft at peak, a 21.5lb-ft disparity from the 101 cam. 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 112-degree cam offered nearly all the low-speed and mid-range torque of the 108 cam but the peak power suffered above 5,200 rpm. As a result, a wider valve opening system with no overlapping allows more oil to fall through the oil inlet. (You can find an instructional video of how to do just that on our Clay Smith Cams YouTube Channel;https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s ). Ed JTO learn to park Joined May 31, 2009 180 Posts I would have to say that your cam choice sounds like a winner to me. Generally, naturally aspirated engines run narrower lobe separation angles of around 106 to 108 whereas supercharged, turbo or nitrous engines operate with 112 to 114 and higher. The piston and cylinder damage possibility is pretty low at 110 LSA. This was science at work, and with data in tow, it was time to crunch the numbers and find out what was going on. Brul slid the 113-LSA cam, the widest of the test, into the engine's heart and set about putting all the pieces back in place. If the overlap phase occurs too early, it will create an overly rich condition in the exhaust port, severely decreasing the gas mileage. On the cranking. The lobe separation angle is a comprise of what the engine needs depending on the compression, combustion chamber, rpm, engine size, head volume, and many, many other variables. Well, there can be different reasons for this problem. I don't think your duration figures are too outlandish and with the tight LCA and high lift, it should make some big torque. I'd also go to a 110-112 lobe separation angle. 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. The #1 intake lobe centerline is usually between 100 Cam and Lifters, Hydraulic Roller Tappet, Advertised Duration 282/288, Lift .589/.600, Chevy, Big Block, Kit. On a torque graph it tends to resemble a triangular shape.. TH400 Vs Powerglide: Which One is Ideal for You? Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! 110 LSA: On the other hand, 110 LSA is a wider LSA with almost no overlap. After the next three pulls, it was clear the 113 cam was way down on low-end torque. An icon used to represent a menu that can be toggled by interacting with this icon. Comp cam hydraulic roller lifters. 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. Looking at 108vs. Armed with more information on camshaft theory, what will you build? Not a HUGE, but a significant difference between 110 and 112, but those are the trends. Lobe separations gives lots of overlap and lobe centers just happens when the grinder decides how the peak of the lobe will arrive on a specific grind by their tooling. Also know as Lobe Separation; Lobe Center is simply the distance between the peak opening points on the Intake and Exhaust lobes. It provides a spark plug with the high voltage needed for combustion. That was all, and we have already reached the concluding point. That way you can discuss what you want from the engine and how changes in LSA or any of the other specs will affect how the engine performs. The first cam featured a wide 120-degree LSA, while cam number two narrowed the angle to 112 degrees. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. On larger displacement units 116 to 118 degrees of separation are common. Do you know what the best lobe separation angle for your car engine is? 04 Minor modifications to the factory windage tray were necessary to work with the new stroker assembly. The 114o lobe will add a lot more vacuum at idle. - Sheryl Crow. Depending on the engine combination, the opposite results can occur. Howards Cam Vs Comp Cam: Which Is The Best Option For You? Methods: We evaluated 30 individuals with PD (62.47.2 years) and 22 age-matched healthy controls (61.06.4 years). After swimming through the entire article, I hope you are now well aware of the 102 vs 110 lobe separation angle. For a better experience, please enable JavaScript in your browser before proceeding. Boom, you get the lobe separation angle of that engine. We will safeguard your e-mail and only send content you request. It had a robust powerband with tons of usable torque. It should still make close to 600hp and 600tq in my 512" stealth headed big block. 110 LSA: You will find the complete opposite scenario here. The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. Vintage/Classic/Historical Engine Tech, 3V Performance Engine & Valve train Development, Race Cars & Parts - For Sale or Wanted. Cam swaps are all the rage and for good reason. Alternatively, if you are running a bigger camshaft to gain maximum top-end power, cam makers often suggest reducing the lobe separation angle to recover power lost in the lower rev 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. The 402 was run with a FAST LSXR LS3 intake and matching 102mm throttle body along with stock LS3 rockers, a Holley HP management system and 7.4-inch hardened pushrods (from Comp Cams). 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Due to the tightness and frequent overlapping of the intake and exhaust valves, the engine cant generate the high RPM as it is supposed to. 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. Pontiac 326 Vs Chevy 327 Differences & Similarities. But, you may find it quite shocking that the piston-to-valve clearances decreasing rate raises the chance of damaging the valve by the piston. This causes the engine's street manners and tuning to become fickle. So, the 110 LSA engine is a suitable choice for people prone to be the fan of a powerful engine with mighty acceleration power. A wider lobe center will give you more overall torque (comes in earlier and stays later). 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. If two cams are identical with the exception of lobe separation angle (we'll say 108 and 114) the cam with 114LSA will make more low end power than the 108LSA cam? 12 In terms of power production, the stroker LS3 performed best with the tightest lobe separation angle. That was just a glimpse of the information you were looking for. The Wastegate works by releasing the pressure built inside, Read More What Are The Wastegate Stuck Open Symptoms?Continue, Oops! Contrariwise, 106 LSA car engines are the best choice for people seeking energy-efficient cars with moderate engine power. The higher the compression and the higher you try and rev it, the more it will like a wider lobe center. 3.75" stroke= 108 LSA 4.00" stroke= 110 LSA 4.25" stroke= 112 LSA 4.50" stroke= 114 LSA I can see exactly where his theory is coming from. One segment that truly benefits from a wider LSA is the marine marine market. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Disclaimer: Remember to always consult with an expert first before trying anything at home. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. It is possible to advance and retard the timing events, but the distance between the centerline of the lobes will remain constant. Chuck Lawrence of Jon Kaase Racing Engines was asked to give a 520ci BBF a Pro Stock sound, so he went with a 108 LSA in place of a more conventional 112 LSA. Another important measurement was the torque production at 4,000 rpm and this cam checked in with 484 lb-ft of torque. Thanks again. 112 will have a smoother idle, a wider power band, and will work better with fuel injection. It also depends on displacement, some guys will run a bigger cam and widen the LCA to give a better idle but in my opinion it kills power. Lobe separation angles, he continues, are influenced by the camshaft grind. The exhaust has an opening even and a closing event. Engine builders Chuck Lawrence, left, and Doug Patton. 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. (ICL + ECL) / 2 = LOBE SEPARATION ANGLE (LSA) LSA is a RESULT of the PROPER events. The valve covers, valvetrain, intake manifold, harmonic balancer, front cover, timing set, and cam were yanked. For a better experience, please enable JavaScript in your browser before proceeding. Despite no changes in lift or duration, this cam sounded much more aggressive than the other two with wider LSAs. The 234o duration kind of eliminates the RV usage. Before getting to the cam profiles, we had to make sure we had a reasonable test engine. The stock valvesprings supplied with the CNC LS3 heads were swapped out in favor of a set of dual springs from Brian Tooley Racing. 106 LSA: On the contrary, if we look at the 106 LSA, we will find it more advantageous and energy efficient than the 110 LSA engine. Now its not shifting into 3rd and you are here. It idles very well at 650 rpm with a nice lope and runs strong. Meaning the lower lobe seperation will have a very quick and fast powerband (Snappy!) It really comes down to the application. More than any other component, the cam profile determines things like idle quality, mileage, and overall driveability. And better gas mileage. It affects the powerband and temperament of a motor more than any other single part, and a slight change can turn a car from a mild-tempered grocery-getter to a downright nasty machine. These issues can often be worked through by an advanced tuner, but always present a challenge and compromise in tuning strategy. When you don't have any overlap, you can't have any wave tuning. The Fora platform includes forum software by XenForo. Your email address will not be published. It may not display this or other websites correctly.
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