LSA questions

[Duct_tape123]

I have been told many different things about the LSA of a cam and have not received any definitive answers to my questions. Some say narrower spreads kill bottom end, then I see a graph that says it doesn't. I just want to know whats the best combo (LSA, dur. and lift) for bottom end torque. Because honestly I don't drive my truck at WOT all the time. Scroll to the bottom of this page. Camshaft Lobe Seperation Angle

[clementeunknown]

I read an article in Super Chevy if changing only the lsa would affect power or not. The cam specs were identical except for lsa and the lower they went the more power & torque increased through out the power band. They went all the way down to 107 lsa. I think it was the March 09 issue or so.

[Duct_tape123]

I saw that too. That one really had me confused, because most people on here tell you to go wide for torque, but then the graph shows something different, and the graph does not lie.

[ff_jeff]

In a specific application changing only the LSA in 2 different cams will show a increase/decrease in power and the curve. The way a cam effects the engine is in the overlap, duration, lift, and center line ect... There is no ''Perfect'' cam for low end torque. Low end torque is also relative. To me, good low end torque is 300wtq before 4krpms. Your not going to get gobbs of torque below 3000 rpms. At least not with out turbo/blower/nitrous/big cubes. If you want a towing rig, your better off getting a 6.0, 6.2, or a dmax. And if your not concerned with WOT and you just want a little more for pulling... get a tune, and call it a day. I recommended a cam called the CheaTR cam in another thread. good off idle power all the way to 6000rpms. Stock idle. that's about as good as it gets. You not going to see 50whp below 4000rpms. nor will you see 50wtq below 3krpms. Not without FI like I said above. Sorry so long.

[wayfastw86]

I was browsing over on the ls1tech.com site and I found a pretty good sticky over there

Got cam/heads/rocker/machining questions about LS1, LS2, LS6? READ ME FIRST! - LS1TECH

[clementeunknown]

Personally I like a choppy idle like a 110lsa. And as said you don't drive at WOT all the time, the idle is just the icing on the cake. This is probably one of the best idles I've heard it's a 110 LSA, LTs,and Areo Turbine muffler.

YouTube - cam idle 001

[motorholmes]

General Motors LS2 Small-Block - Cam Swap - Tune - Hot Rod Magazine

Here's a good article showing how narrowing the LSA improves torque and lowers the peak RPM of both. I've also heard that the LS-based engines have the best vacuum above 112 to 114 and I figure that's why I can't find a 112 or 110 cam for the 6.0L. I guess I'm shooting for the 114. Duration steals torque. Lift, compression, and displacement all increase it.