It really comes down to the application. Since we were only changing the lobe separation angle, we had to make sure every variable (air/fuel, timing, water, air, and oil temps) was identical during testing. I have 108 for LSA and my headlights take awhile to go up when the car is idling. It is an important note you must keep; due to the lobe separation angle, there creates an overlapping of intake valve opening time and exhaust valve closing time and vice versa. FWIW. The 108-degree cam (blue lines) outperformed the other two, but idle quality suffered. A narrower lobe separation angle can provide less power but can also lead to less wear. 09 All testing was run through a set of 1 3/4-inch long-tube headers and 3-inch exhaust. This is one of the many reasons why Clay Smith Cams always recommends degreeing your camshaft in using the Lobe Center Method. Lower cylinder pressure is advantageous for your engine. by bug1914 Tue May 13, 2003 2:56 am, Post The 110o will make more power overall. " - Voltaire. Nothing makes mouths drop like a car that sounds and looks like it can't keep it self still! It will also give you a smoother idle and probably even better gas mileage. It's the scavenging effect of the high velocity exhaust gases rushing out that pulls the fresh fuel/air charge into the chamber. I've seen that Webcam cams can be ordered with either of the above. More than any other component, the cam profile determines things like idle quality, mileage, and overall driveability. Ultimately, it makes the 110 LSA an oil-consuming LSA. Contributions la connaissance de la flore du Maroc et de l'Afrique du It should still make close to 600hp and 600tq in my 512" stealth headed big block. Lobe Separation or Lobe Centers is another way of expressing the Valve Overlap, which was the term formerly used by cam manufacturers before industry standard verbiage changed. Realize what the engine is going in, however, as you may not be able to use the wildest cam out there. This form of short-term memory is supported by the prefrontal cortex (PFC) and is believed to rely on the ability of selectively tuned pyramidal neuron networks to persist in firing even after a to-be-remembered stimulus is removed from the environment. We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. by ANT Thu May 15, 2003 6:44 pm, Copyright 2022, S&S Motorsports LLC, All Rights Reserved - Powered by phpBB Forum Software phpBB Limited. 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. 554"/577" lift. AquaTraction Vs SeaDek: Which One Is Better For you? Lobe separation angle does. Well get out of that stocker and build a hipo motor for your VW. by lazaris Fri Dec 12, 2008 2:18 pm, Post The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. 114 lsa cam sound clips | LS1LT1 Forum 110 LSA: On the other hand, 110 LSA is a wider LSA with almost no overlap. If all the specs remained the same what will going from a 110 to a 112 lsa do to driving characteristics? 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. Is There a Sequence? Changing lobe seperation from 110 to 112-14? | For B Bodies Only I wouldn't assume 4 links fuel requirements will mirror yours at all. Post Enter lobe separation angle. For your convenience, I am providing a comparison table to give you an overall idea about the comparison. Cylinder-head flow and LSA are directly related: as a rule of thumb, the better the head flows, the wider the LSA can be. When boost or nitrous are introduced, and engine builders contemplate choices between single-, dual- or reverse-pattern camshafts then the discussion gets muchmore technical. 06 The ported heads featured a 2.165/1.590-inch valve combo. The only reason the advance or retard a camshaft profile is to get the timing events where they need to be. LSA is a result of valve timing events. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. A wider lobe center will give you more overall torque (comes in earlier and stays later). To establish the position of each lobe, the traditional reference point is where the lobes reach max lift. That was just a glimpse of the information you were looking for. Only once the intake valve has closed can compression begin to build. turbo camshafts lobe centers and lobe separation 4-Link72, do you run racing gas or pump with 10.5:1 CR? Methods: We evaluated 30 individuals with PD (62.47.2 years) and 22 age-matched healthy controls (61.06.4 years). hydraboost is the same as a vacuum brakebooster, only the booster is replaced by a unit that does the same but under hydraulic pressure. 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 -. by SStrokerAce Sun Dec 07, 2008 12:22 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. Check out the Comp Cams catalog, even the biggest hydraulic rollers use 110. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open. So, choose the perfect lobe separation angle for your engine, complying with the requirements of your needs. 110 LSA: On the contrary, it is pretty unpleasant to inform you that the efficient compression rate decreases at 110 LSA. by SStrokerAce Sat Dec 06, 2008 7:36 pm, Post The reduced rate of the EGR effect lowers oxygen circulation in the engines combustion chamber. Either learn to fix it, or learn to write checks. by randy331 Sat Dec 06, 2008 10:00 pm, Post Well, there can be different reasons for this problem. The graph above compares intake valve closing points of the three cams used in the test. Well, it is quite a natural event that you may not find the lope separation angle mentioned at the engine body. The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. I'm surprized at these questions as well as some of the replies. " lobe centers and lobe separation are 2 different things . i think a little more torque will be good for my car.With the XE274 it was a little slugish until around 3000 rpms. 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? A forum community dedicated to hot rod owners and enthusiasts. The 114 LSA is good for a blower or nitros motor. A cam 112LSA with 4 degrees advance puts the intake centerline at 108 degrees. its got a 3.73 posi and the Stock 4 speed with a very low 3.42 1st gear. Lobe separations on 383-406 cids.104-106-108-110? - Don Terrill's Speed 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. by flat4racer17 Mon May 12, 2003 1:40 pm, Post The final cam was tighter still, with a 108-degree LSA. Pinning the tail on the perfect cam can certainly be a difficult task. Mistakes that weaken a supercharger's performance The second cam would have a rougher idle, produce more torque and would rev quicker. A cam's lobe separation determines where and for how long peak torque occurs in an engine's rpm range. 292S-112: 292/292 - 240/240 - .495/.495 - 112* - 3400-7200. The SAME can be said. 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. I think the compression ratio has something to do with LSA too. He also enjoys reading books a lot and his favorite author is Paula Coelho. Idle quality was rough and the vacuum gauge showed only 9.8 in-Hg (inches of mercury). 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. In general, a stock replacement camshaft with duration of less than 200 degrees will have a lobe separation angle of more than 114 degrees. Engine builders Chuck Lawrence, left, and Doug Patton. ALL bolts are ARP. However, finding them might be challenging if you dont have any prior knowledge. I'd also go to a 110-112 lobe separation angle. Increased overlap improves upper RPM power. But it also has a lot of lobe separation. 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). 110 LSA: On the contrary, if you look at the powerband at 110 LSA, the powerband is comparatively broader. 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