Camshaft Lobe Separation Angle | Classic Car Restoration Club The intake air control valve (IAC), which regulates idle speed, also has to work overtime and often attempts to "catch" the idle, but usually shoots high or low. The world of fuel injection is where wide LSA cams like the 113 really shine. so it is a solid flat tappet, torker intake, 1" 4-hole tapered spacer and 750 carb (QFT) transmission is a wide ratio toploader, rear is a 9" 3.89 geared 26"rear tires. [img]http://i67.photobucket.com/albums/h291/downsideup09/DSCF2616-1.jpg[/img], [img]http://photos-g.ak.fbcdn.net/hphotos-ak-snc1/hs139.snc1/5928_111214857139_110806152139_2127222_6826389_n.jpg[/img]. This may be of concern if you have vacuum assisted accessories, such as power brakes or steering. Thanks again. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! Lucky for us, Brian Tooley Racing stepped up with a dual spring package that allowed us to safely run our 0.624-lift cam. The 402-inch LS2/LS3 hybrid stroker started out with an LS2 aluminum block. The only reason I . 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 extra cubic inches will smooth out a rough idle in a 327. Lobe separation angles, he continues, are influenced by the camshaft grind. General topics - 76 LA built, CA car with m20. And better gas mileage. Moreover, a user from the Chevelle forum said. 4-Link72, do you run racing gas or pump with 10.5:1 CR? TECH QUICKIE: Camshaft Lobe Separation Angle And Power - EngineLabs 110 LSA: But here, quite surprisingly, you have to face the reduction of the EGR effect due to the 110 LSA. Fixing the ignition coils is essential when you experience issues like engine misfire and the Check Engine light that wont go off. Its the shifting problem again with your Chevy! On larger displacement units 116 to 118 degrees of separation are common. 106 LSA: The scale of efficient compression rises at 106 LSA. Comparison Table Between 106 Vs 110 Lobe Separation Angle. AquaTraction Vs SeaDek: Which One Is Better For you? 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. 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! I know a little about cams. Bad idea in my view. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. It made 472.4 lb-ft at peak, a 21.5lb-ft disparity from the 101 cam. Most cars use more than, Read More Does It Matter Which Ignition Coil Goes Where? by flat4racer17 Tue May 13, 2003 9:12 pm, Post No, it is not even close to the ultimate performance grind most would have picked. A Pro Stock engine builder may prefer a wide LSA to help keep the power from breaking traction tOo early. See all 14 photos 13 The three power curves indicate that the wide (120-degree). 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. This has been my long time understanding! LS Exhaust Manifold Bolt Torque (Everything You Need To Know), Holley Power Valve Sizes: Everything There is to Know. In this segment, I am going to compare those two lobe separation angles based on a couple of mechanical factors. Another difference between the two involves the power curve. by lazaris Fri Dec 12, 2008 2:18 pm, Post Defining Lobe Center and It's Importance to Engine Performance: A Blog. A wider LSA moves intake- and exhaust-valve events farther apart and creates less overlap, which hurts intake-wave tuning. Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! 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. 106 LSA: You can see an increasing EGR effect at 106 LSA. = Extremely Tight . too much for the street? 4-linked72, what cam are you using that has a 108 LSA? The takeaway from this test is camshaft LSA is a double-edged sword. O onovakind67 Registered Joined Dec 14, 2001 6,242 Posts For any additional clarification or questions please contact our Tech Line at 714 523-0530. https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s. 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. 106 Lobe Separation Angle | The De Tomaso Forums Coupled that with the low first gear of the five speed, it ought to create some real traction problems. There are General guidelines about the effects of LSA but it should not be the deciding factor in choosing a cam. Lobe Separation Angle - Restoration and Repair Help Cam and Lifters, Hydraulic Roller Tappet, Advertised Duration 282/288, Lift .589/.600, Chevy, Big Block, Kit. 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. http://www.mustangworks.com/cgi-bin/moi-display.cgi?220, http://www.popularhotrodding.com/en6em_camshaft_specs/lobe_seperation_angle.html. Compression willl be 9.75:1. Higher lift and longer duration profiles add power, but do so at higher engine speeds (especially true of duration). Before getting to the cam profiles, we had to make sure we had a reasonable test engine. #2---Choosing a Cam - Hughes Engines 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. But i would nt go any wider than 110. Yearh, I have been reading a lot about this issue. This was science at work, and with data in tow, it was time to crunch the numbers and find out what was going on. I've heard similar cams (only about 5*'s off) and they have a nice rumble to them. 114 vs 110 lobe sep. on cam | NastyZ28.com Armed with more information on camshaft theory, what will you build? A few other major and, Read More Heres What Causes Your Car to Bog Down When AcceleratingContinue, Your email address will not be published. Once more the engine came apart to install the third test cam, a 107 LSA. A cam in the 110112 LSA range provides the necessary idle lobe to appease gearhead ears with acceptable manifold vacuum to run vacuum-operated accessories. A forum community dedicated to hot rod owners and enthusiasts. Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. Most street cams are ground 4 degrees advanced which boosts bottom end, throttle response, vacume, mpg driveability etc. The center of those 2 events is the LOBE CENTERLINE (ECL). by randy331 Sat Dec 06, 2008 10:00 pm, Post TH400 Vs Powerglide: Which One is Ideal for You? The taller lobe seperation will have a longer powerband but will have to rev higher to make the power than the lower lobe seperation! by mrsmythe Mon May 12, 2003 11:15 am, Post LSA CAM TEST-108 vs 112 vs 120 - YouTube Lobe separations on 383-406 cids.104-106-108-110? Similarly, 110 LSA is also found to be a more fabulous performer in several mechanical aspects. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. I would have to say that your cam choice sounds like a winner to me. Anybody here run a 108 LSA? However, these rules are not absolute. 106 LSA: So, if I talk about the powerband at 106 LSA, the powerband is narrow. Hopefully it turns out great. The higher the compression and the higher you try and rev it, the more it will like a wider lobe center. Generally speaking, decreasing the lobe centerline angle increases overlap. I'm sorry to disagree with that incredibly well written article, but lobe separation by itself is absolutely freaking meaningless. Is There a Sequence? We do not stock profiles with 109 or 114 lobe centers. More than any other component, the cam profile determines things like idle quality, mileage, and overall driveability. A narrower LCA will increase valve overlap and close the (intake) valve earlier, which explains the typical rougher idler and more midrange behaviour. 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. ( 2 ) Estimated Ship Date: Feb 23, 2023 (if ordered today) Drop Ship. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. Hey guys, can anyone tell me how rough of a idle a cam would be with a 108 lobe separation? That is no accident. 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! Okay, have a sigh because you have opened the right door. The 114 LSA is good for a blower or nitros motor. . (LOBE SEPARATION ANGLE)cam CRANES 110921 has the intake close at 45 degrees ABDC while the wider lsa CRANES 114681 closes the valves at 50.0 ABDC . We will also custom grind any of the above profiles with a custom lobe center, for an additional $20 dollars. 06 The ported heads featured a 2.165/1.590-inch valve combo. The engine has AFR heads, Crane rockers, a TCI balancer, a Scat Rotating assembly with Mahle pistons, an Edelbrock RPM Air-Gap intake, an MSD ignition, and an Aeromotive fuel system. The balance of midrange torque and top-end horsepower lends this LSA range to the majority of street/strip engines. Maybe even 114. JavaScript is disabled. " - Voltaire. Post Mechanical aspects like maximum torque, narrower powerband, higher cranking compression rate, efficient compression rate, effective EGR effect, and lower oil consumption rate increase the car engines efficiency and make it energy efficient. An RV or towing camshaft, which is considered a mild performance or an economy cam, will often have a narrower LSA, between 112 and 114 degrees. (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 ). The custom cams we selected all featured 0.624-inch lift (both intake and exhaust) and a 232/242-degree duration split. An icon used to represent a menu that can be toggled by interacting with this icon. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open. Aluminum flywheel & pullies. Not a HUGE, but a significant difference between 110 and 112, but those are the trends. by mike thompson Tue May 13, 2003 4:03 am, Post You are using an out of date browser. The 290 advertised duration and 114 lobe separation would contribute to a lazy power curve. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Full text of "Pediatric Books" LCA (lobe center angle) vs LSA (lobe seperation angle) The reduced rate of the EGR effect lowers oxygen circulation in the engines combustion chamber. But for small-block Chevys (like the LS applications in this story), the LSA is ground into the cam. 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 Is a 108 Lobe Separation 2 Much? | Hot Rod Forum 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. As usual, Marc (aka Master) is correct. This process slows down the reaction rates of the air-fuel mixture, causing temperatures to drop and preventing the engine from overheating. When choosing a cam, power gains shouldn't be the only consideration. I just bought a 86b Webcam with 112 lobe centers for my 2276. I just bought a 86b Webcam and Im using 1.5's. by SStrokerAce Sun Dec 07, 2008 12:22 am, Post This is one of the many reasons why Clay Smith Cams always recommends degreeing your camshaft in using the Lobe Center Method. = Moderately Wide 110-108 Deg. We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. For a better experience, please enable JavaScript in your browser before proceeding. Whatever you do, stay under 270 advertised duration and shoot for a 110 lobe separation. 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. However, it is fixable. The lobe separation angle is the angle between the two camshaft lobes that act on the valves. dur. by Kdub Sat Dec 06, 2008 11:05 pm, Post Cylinder-head flow and LSA are directly related: as a rule of thumb, the better the head flows, the wider the LSA can be. 106 LSA: At 106 LSA, the cylinder pressure is a bit higher. To illustrate the differences offered by changes in the LSA, we had Crane cams grind us three cam profiles that shared the same lift and duration figures, but differed only in the LSA. At a lower LSA, the engine reaches the peak of the torque earlier than the standard time but generates a lower RPM.On the contrary, at a higher LSA, the engine reaches the peak torque at a higher resistance level and generates a bulk number of RPM. The engine would idle a lot rougher and generate worse exhaust emissions largely because of unburned fuel.. 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.
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