Hopefully It will do fine in my 2276 mostly drag bug. 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. Nothing makes mouths drop like a car that sounds and looks like it can't keep it self still! However, a cam with 108 will only pull 12-16", which is not enough for power assisted accessories. by 3V Performance Sat Dec 06, 2008 4:38 pm, Post Elle concerne 264 taxons des degrs divers. 2023 Power Automedia. 292S-112: 292/292 - 240/240 - .495/.495 - 112* - 3400-7200. 554"/577" lift. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. LSA helps determine the cam's behavior; you can take a given set of lift and duration figures, change the LSA, and get cams with vastly different characteristics. Walter Noah is a process engineer who has a knack for resolving even the toughest technical issue. On a tight lobe separation, like 106-108 degrees, the engine will build torque quickly and reach its peak early. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! The graph above compares intake valve closing points of the three cams used in the test. 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. The 234o duration kind of eliminates the RV usage. The 30-30 Duntov is on the high end of the duration recommendation. If it occurs too late, it will lean out the cylinder and greatly hinder the performance of the engine. Post 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. by Kdub Sun Dec 07, 2008 1:20 am, Post This was science at work, and with data in tow, it was time to crunch the numbers and find out what was going on. Selecting a camshaft for a given engines purpose usually involves a compromise between low- or high-end power options, and the lobe separation angle (LSA) is one of those factors where engine builders have to make a choice between those priorities. The 402-inch LS2/LS3 hybrid stroker started out with an LS2 aluminum block. I personally prefer to sacrifice the small amount more power for better idle quality. Lobe Separation Angle "LSA "Jump to Latest Follow 1 - 17 of 17 Posts . 112-110 Deg. A cam card with its myriad numbers, acronyms, and abbreviations is one red-pen stroke away from a failed math test. 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. The Wastegate works by releasing the pressure built inside, Read More What Are The Wastegate Stuck Open Symptoms?Continue, Oops! I would have to say that your cam choice sounds like a winner to me. Cam and Lifters, Hydraulic Roller Tappet, Advertised Duration 282/288, Lift .589/.600, Chevy, Big Block, Kit. See all 14 photos 13 The three power curves indicate that the wide (120-degree). If you're an OEM automaker looking for a steady idle, good fuel economy, and passing tailpipe emissions, this is the cam of choice. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. It made 472.4 lb-ft at peak, a 21.5lb-ft disparity from the 101 cam. 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 -. But i would nt go any wider than 110. Also If you go with 112 lobe centers, you create less valve overlap which will increase your compretion. by ANT Mon May 12, 2003 1:47 pm, Post 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. I forgot to add that poor vacuum is not much of a concern to me because I have no power accessories. such as 290 @.050? The engine would idle a lot rougher and generate worse exhaust emissions largely because of unburned fuel.. Comp cam hydraulic roller lifters. A commonly held misconception is that intake/exhaust overlap contributes to lower cranking compression. The 110 is probably a better choice for a performance street engine. 110 for sure. This is ground into the cam and can't be changed without changing cams. This table will create a map in your head, and I bet it will make your understanding crystal clear. I though my car would have a nice rough idle with the solid cam with a tight LSA I put in my car, its go a slight lope to it, but it pulls hard. On engines equipped with independent intake and exhaust cams, the LSA is adjustable. 106 LSA: At this LSA, the car machine has to confront the reduction of idle vacuum rate quite often. That notion is completely false. Thanks. i think a little more torque will be good for my car.With the XE274 it was a little slugish until around 3000 rpms. Because the lobes are closer together on the 101 LSA cam, the intake closing point is advanced (closes earlier) and the piston has more time to build compressionexactly what the gauge showed. How do the lobe separations change when you factor in turbocharging? The LSA, or lobe separation angle, is ground into the cam and cannot be changed. Pretty much standard for an RV type cam. The lobe separation angle in a natural car engine conveys a considerable impact, especially regarding the maximum torque. A Pro Stock engine builder may prefer a wide LSA to help keep the power from breaking traction tOo early. 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. 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. The intake lobe centerline is measured in crankshaft degrees. Comparison Table Between 106 Vs 110 Lobe Separation Angle. I've heard similar cams (only about 5*'s off) and they have a nice rumble to them. 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. thanks. 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. So, this LSA is suitable for your engine and its components. You cannot look at just the LCA without looking at other specs too. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! "Ninety-nine percent of cranking compression is dictated by static compression ratio and intake-valve closing point," said Comp Cams' Billy Godbold. Wide LSA cams are also applicable in forced-induction applications where less exhaust overlap is required. 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. Coupled that with the low first gear of the five speed, it ought to create some real traction problems. somthing to that aspect. 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. 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. 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? Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. Once more the engine came apart to install the third test cam, a 107 LSA. Good luck. 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. Most cars use more than, Read More Does It Matter Which Ignition Coil Goes Where? 110 LSA: On the other hand, 110 LSA is a wider LSA with almost no overlap. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Powerband serves a massive contribution to the acceleration car. 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. 106 LSA: 106LSA results in a decrease in piston-to-valve clearance. Enter lobe separation angle. The other thing is that you can make more power with a smaller aftermarket cam. I'm surprized at these questions as well as some of the replies. " Aluminum flywheel & pullies. Aug 20, 2006. 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. You are using an out of date browser. also,, wider will produce a wider and more flat torque curve that doesn't fall off as abruptly up top rpms. Armed with more information on camshaft theory, what will you build? I know a little about cams. 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. If you look at any given cam catalog, you will find that the majority of street-oriented cams fall in this range. 106 LSA: As the 106 LSA is a tighter LSA, it fails to generate maximum power. A 110-degree lobe separation angle means that the peak opening points of the intake and exhaust lobes are 110 degrees apart. Anybody here run a 108 LSA? The taller lobe seperation will have a longer powerband but will have to rev higher to make the power than the lower lobe seperation! 110 LSA: On the contrary, it is pretty unpleasant to inform you that the efficient compression rate decreases at 110 LSA. Bolander says those cams help promote torque in a controlled and predictable manner, especially in no-wake zones and around the docks. 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. Well, If I am not mistaken, you must be looking for which angle has what impact on your engine or which would be the best. While a cam with a 108 lobe center will idle rougher. Come here to talk with others who like to drive fast. 106 LSA: So, if I talk about the powerband at 106 LSA, the powerband is narrow. Ed JTO learn to park Joined May 31, 2009 180 Posts Its the shifting problem again with your Chevy! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. 108 vs 112 lobe seperation. Save Share. The only reason the advance or retard a camshaft profile is to get the timing events where they need to be. Pontiac 326 Vs Chevy 327 Differences & Similarities. 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. A wider lobe separation angle can often provide more power, but it can also lead to more wear on the engine. 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. How To Properly Replace Ignition CoilsContinue. The tighter the lobe center, the lower the RPM range; the wider the lobe center, the higher the RPM range. by xstfudonniex Sat Dec 06, 2008 4:21 pm, Post Fixing the ignition coils is essential when you experience issues like engine misfire and the Check Engine light that wont go off.
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