3.1 stroker cam?

392 Views 2 Replies 3 Participants Last post by steves280, Nov 17, 2004

24ounce

Discussion Starter · Nov 16, 2004

dose the cam setup change the safe zones of the motor redline and tach or whatever?

im in contact with colt cams trying to get a good cam setup for a 3.1

im kinda lost with this because im driving an l24e31 right now - littel revmaster and have found optimal shift between about 6300 and 6500 in first and around 61-6200 in remaining gears im thinking the 3.1 woould act somewhat different i would love to build the motor to pull to almost 7000 but i have no idea what these 3.1 strokers do and where is optimal shift and what not

where do you 3.1 stroker guys think i should have the cam pull range? colt wants a 3500rpm range where i want the cam to pull the strongest

i know it depends on the whole motor set up but just say a standered 3.1 with exhaust and 3.90s is a good shift 58 or could a good shift be 68? it will be going in the 70 which should be sitting right around 2100 - 2200lbs with driver

just need some help here

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Dan Baldwin

· #2 · Nov 16, 2004

The standard 3.1 can safely be revved to and beyond 7000 rpm, so you've basically got the choice of maximizing power (3500-7000 power band) or maximizing street driveablility (~2000 - 5500), or anywhere in between.

However, a big cam with a stock head with stock intake (carbs or FI) will give you poor low-end response AND no top-end rush either

If you want to tune for maximum power, it's going to take more than just a cam. You will need headwork and big carburetion (multiple 44-45mm 3x2) or big FI setup (dunno what the stock FI will support, hp-wise, but I doubt it'll feed 3.1 liters very efficiently at 7000rpm).

The beauty is that you can tune a bigger-displacement engine more for high-rpm power while still having adequate low-end torque. But you won't get there with stock heads and stock intake (I don't think).

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steves280

· #3 · Nov 17, 2004

Also a larger displacement engine using the same head needs a "bigger" cam to have the same rev range. i.e. a hot cam for a 2.4L won't be that hot with a 3.1L. Dans right the stock EFI intake won't feed enough air for a 2.8 to make power over 5500 so it probably will fizz out at 5000 or less on a 3.1. You'll need big carbs or a custom EFI intake to make high RPM power.

I just had colt grind me a 280/280 cam with .510 lift 111 lobe centers that I'm planning on using in a 3.1L I'm building using custom EFI manifold/big header etc. Might end up going to a 292/292 if this one doesn't -turn on- on the top end like I want. I'm looking for big power from 3500-7000+

The setup I have right now pulls =hard= from 4000-7000 and figure a better head with more displacement and a hotter cam will just be more of the same, just more of it.

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