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Old 05-18-2008, 06:15 PM
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LSA idle question

I am building a 383 stroker. It is going to be a somewhat aggresive motor. The cam I am going with will probably be a 236 int 242 ext. My questions is LSA 110 or 112. I am leaning on on the 112 for a better idle quality. What is everyone feeling on LSA

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Old 05-18-2008, 06:41 PM
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It depends on your application. Auto or manual? heavy car or light? Gears? street or strip? You gotta post everything you know or its really hard for us to help.
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Old 05-18-2008, 07:02 PM
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Basically I am building a 63 chevy that is to appear visually as stock on the outside but to have some substantial power. This car shall be primarily street driven but will see the track 6-8 times a year. Cam is to be a solid roller.
Motor will have 2.02 1.60 fuelie heads ported and polished flows 250 cfm, intake is origional from a 63 327 that has been ported. Carter carb that has ben modified to flow around 750 cfm. Overall compression should be around 10.5 to 1
The car wieghs 4,000 LB with driver, M20 4 speed, 4.11 gears, tires on it will be 28" tall.
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Old 05-18-2008, 09:19 PM
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I think either one will work fine with that setup. The 112 will still have quite a lope to the idle and make a bit flatter torque curve, but might give up substantial peak power.

I'll run some dyno simulations tomorrow and maye post some screen caps of both scenarios.
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Old 05-19-2008, 06:07 AM
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Quote:
Originally Posted by curtis73
I think either one will work fine with that setup. The 112 will still have quite a lope to the idle and make a bit flatter torque curve, but might give up substantial peak power.

I'll run some dyno simulations tomorrow and maye post some screen caps of both scenarios.

You the man! Thanks!!!
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Old 05-19-2008, 10:16 AM
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Cams are always about tradeoffs. Give up something to get something else somewhere else. Wider lobe centers help the idle and broaden the torque curve, but give less top end horsepower.

BTW, you can keep all that stock-appearing stuff, which costs much horsepower, but with that cam, it ain't foolin' nobody who knows engines.

Modest proposal: Put on the best modern aluminum heads and intake, grind off the logos, stock rocker covers and paint it all orange, use the stock air cleaner and a small cap HEI with black plug wires. You'll be foolin' the same number of idjits that it is a stocker and won't fool the same engine guys who can hear the cam, but you'll have 75-100 more horsepower on the top end.

thnx, jack vines
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Old 05-19-2008, 11:37 AM
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Basically I am building this car to motor to enter into the stock appearing drag category which has become somewhat big around here. Not looking to hide anything when I start the car up
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Old 05-19-2008, 11:53 AM
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I think the 110 lsa will have slightly better throttle response. And the 112 will have slightly better idle. Most likely not noticeable either way. 2 degrees isn't that much of a difference. If you were considering 114 LSA then there would be more of a difference to think about.

But a 4.11 gear used with a 4 speed trans would work better with a narrow power band (in theory). So, I say go with the 110 for best et or a 112 for best idle.
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Old 05-19-2008, 01:09 PM
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Quote:
Originally Posted by cowbay
Basically I am building this car to motor to enter into the stock appearing drag category which has become somewhat big around here. Not looking to hide anything when I start the car up
You're building the car to race it. Don't select the cam based on idle quality.

Pat
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