Thoughts on 111 LSA on carb APP.
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Thoughts on 111 LSA on carb APP.
Just as the title says just wondering what you guy's thoughts are on a 111 LSA?? I realize a 110-108 is probably better but just curious of your thought on runnning 111 with a carb???
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Some of the carb specific cams go down as low as 106 installed. But, depending on the piston and heads, becareful how tight you go, as flycutting may be required. It all depends on what you want and what your willing to put up with. The carb database sticky at the top of the carb forum page is an INVALUABLE source of information on this subject. Best of luck with what ever cam you choose. Eric L
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Narrowing the LSA increases overlap. On cars with good and proper headers and free flowing exhaust, the scavenging effect of the headers increases the intake pulse in the midrange. This boosts the midrange power. The increase/advantage is exaggerated on cars with large volume heads and/or short runner single plane intake manifolds. This is why you see narrow lobe center cams being recommended and run on drag cars with single plane intakes. Cars with automatic transmissions tend to prefer a narrower lobe center than a stick shift car.
The above information is not specific to LS motors. We have know this for decades. However, the LS motors appear to be no exception.
The above information is not specific to LS motors. We have know this for decades. However, the LS motors appear to be no exception.
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I have several build forged nitrous motors with the old SBCs and are on a 106, they run pretty damn hard, gaining allot from small 200 shots.
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Any proof to back that? I can believe it at lower revs, but at higher RPM, where the events happen at a increased rate, it may very well not be so. If a tighter LSA brings TQ in faster on motor, it may bleed off some power from nitrous, but on the bid end, i find it not so easy to believe it is not getting the most from it.
I have several build forged nitrous motors with the old SBCs and are on a 106, they run pretty damn hard, gaining allot from small 200 shots.
I have several build forged nitrous motors with the old SBCs and are on a 106, they run pretty damn hard, gaining allot from small 200 shots.
Anytime you run a tight LSA both the intake and the exhaust valves are opening closer together leaving "both doors open". This allows more of the nitrous charge to slip out the open exhaust valve. Taking power away anywhere in the powerband will affect the whole run. Obviously as you know the narrow LSA actually narrows the powerband, so the whole shot will actually be optimized for a very short distance of the pull. I don't have actual numbers but I have have read up on test done. None of my links are saved but I will try and find one for you when I get a chance.