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Ultimately, it makes the 110 LSA an oil-consuming LSA. Simply put, both 106 and 110 lobe separation angles have many advantages and disadvantages. We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. If you changed the lobe separation of a street engine from 112 degrees to 106 and didnt do anything else, adds Kaase. 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 A forum community dedicated to Ford performance owners and enthusiasts. by Hoxviii Mon May 12, 2003 7:50 pm, Post A wider lobe center will give you more overall torque (comes in earlier and stays later). by jobes Sat Dec 06, 2008 3:51 pm, Post Call for details with your specific combination. 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. 03 The 4.000-inch crank and 6.125-inch rods were combined with a set of forged asymmetrical pistons from JE. If you shift at 7500-7800 add 4-6 degrees to both intake and exhaust and spread the lobe separation to 108-110. dur. More over-simplifications: Adding an aftermarket cam to an otherwise stock engine can boost output by 40-60 hp (or more) with no other changes (except possibly a valvespring upgrade). JavaScript is disabled. We will also custom grind any of the above profiles with a custom lobe center, for an additional $20 dollars. 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. On the cranking. So, choose the perfect lobe separation angle for your engine, complying with the requirements of your needs. In the 106 LSA, the engine can reach the maximum torque, making the driving more efficient and saving energy. The lower the lobe seperation,, ie. I've seen that Webcam cams can be ordered with either of the above. Knife edged & profiled 4MA Cleveland crank weighing 50lbs. Our content is merely suggestive, not intended to use without proper safety precautions and advice. Also present during testing was a set of 1 7/8-inch Kooks headers, Comp hydraulic roller lifters, and F-body oil pan. If you compared these two cams side by side in identical engines, the first cam would actually have a slightly better idle and would produce slightly more peak power at upper RPM's. 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. For your convenience, I am providing a comparison table to give you an overall idea about the comparison. After spending 8 years in plant production engineering, Noah wanted to join Engine Addiction as a key member of all cars specific guides, reviews, repairs, suggestions, and more. You can modify the lobe center a little bit but not enough to change the actual overlap of the grind. You get a better idle, vacuum, and response from a 112o-114o lobe. I just bought a 86b Webcam and Im using 1.5's. 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. Boom, you get the lobe separation angle of that engine. music to your ears? 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. ditto with the above. I do believe that stock VW seperation is 108 and 112 is used alot in turbo and midrange cams for VW's while 106 is used for the top end cams. (2002) et rappel sur une carte hors texte. 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. Also If you go with 112 lobe centers, you create less valve overlap which will increase your compretion. by mrsmythe Mon May 12, 2003 11:15 am, Post With the first cam loaded in the engine (the 101 LSA) Westech's Steve Brul made three dyno pulls, the average of which was saved to compare to the next cam. This cam split the difference between the 101 and 113 down the middle, and in theory should have walked the line between the results of the last two tests in every waywhich it did. 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. Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. Comp cam hydraulic roller lifters. Ed JTO learn to park Joined May 31, 2009 180 Posts 110 LSA: On the other hand, 110 LSA is comparatively a wider LSA; it can generate a massive amount of RPM for the engine. My duration will be about 230 degrees. For example, an oval-track small-block that needs to motivate the car off the turns quickly might have a narrow LSA of around 106 degrees, resulting in more overlap. It idles very well at 650 rpm with a nice lope and runs strong. If the exhaust valve closes too early it will trap some of the spent gases in the combustion chamber, and if it closes too late it will over-scavenge the chamber and take out too much of the charge, again creating an artificially lean condition. Tests 2 and 3 meant dissecting the motor on the dyno to get the old cam out. 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. 108 is very tight producing lower vacuum and more of a 2 stroke "punch" powerband. The final, 108-degree cam stepped power up even further, with peaks of 572 hp at 6,300 rpm and 544 lb-ft at 5,200 rpm. Check out the Comp Cams catalog, even the biggest hydraulic rollers use 110. 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. The graph above compares intake valve closing points of the three cams used in the test. 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. It a 355. thanks in advance. Frontal lobe epilepsy (FLE), the second most common focal epilepsy syndrome after temporal lobe epilepsy (TLE), is frequently drug-resistant and MRI-negative. So, the 110 LSA engine is a suitable choice for people prone to be the fan of a powerful engine with mighty acceleration power. I forgot to add that poor vacuum is not much of a concern to me because I have no power accessories. 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. If the intake valve opens too early, it will push the new charge into the intake manifold. It is the average centerline between both lobes and expressed in degrees ranging from 95 on the extremely narrow/tight side to upward of 120 on the wide end. 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. 110 LSA: On the contrary, 110LSA has a higher piston-to-valve clearance rate. Coupled that with the low first gear of the five speed, it ought to create some real traction problems. All testing was performed with an Aeromotive fuel pump feeding a set of 42-lb/hr injectors. The Crane has a smoother idle, broader power band, and . 106 LSA: The overlapping is higher as 106 LSA is comparatively tighter LSA than 110 LSA. What brand and what are the specs on your cam, 4-linked72? On a torque graph it tends to resemble a triangular shape.. For a better experience, please enable JavaScript in your browser before proceeding. Some prefer a narrow powerband, and some prefer the broader one. 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? But for small-block Chevys (like the LS applications in this story), the LSA is ground into the cam. However, it is fixable. While a cam with a 108 lobe center will idle rougher. lobe centers and lobe separation are 2 different things . The 110 is probably a better choice for a performance street engine. Torsion Beam Vs Multi Link: Who Wins the Battle? It provides a spark plug with the high voltage needed for combustion. 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. Engine knocking generally occurs when the burning of the fuel by the engine is uneven. The reduced rate of the EGR effect lowers oxygen circulation in the engines combustion chamber. I've heard similar cams (only about 5*'s off) and they have a nice rumble to them. Cylinder-head flow and LSA are directly related: as a rule of thumb, the better the head flows, the wider the LSA can be. If the overlap phase occurs too early, it will create an overly rich condition in the exhaust port, severely decreasing the gas mileage. Yearh, I have been reading a lot about this issue. The ported heads were capable of supporting over 700 hp, so we knew they would not be restrictive on our stroker. Lobe separation angles, he continues, are influenced by the camshaft grind. The 114 cam will give more low end torque, good midrange, less power up high. 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The only reason I . What Are The Wastegate Stuck Open Symptoms? 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. by Kdub Sun Dec 07, 2008 1:20 am, Post 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 110o will make more power overall. As usual, Marc (aka Master) is correct. 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. = Moderate 108-106 Deg. TH400 Vs Powerglide: Which One is Ideal for You? by jim martin Mon May 12, 2003 7:10 pm, Post It had a robust powerband with tons of usable torque. THis is a real generalization, but the weaker your heads, the more you will like the smaller centers ( 106-108) the better the heads, and the higher the compression, the more it will like the wider centers ( 112-114)everything else falls somewhere in the middle( 108-110) Once you get close with the cam centerlines, it wont make much differance if you change it up or down by 2 degrees. Come here to talk with others who like to drive fast.