On Thu, 22 Jan 1998 15:22:05 -0800 Steve Sage <rootes(at)ix.netcom.com>
writes:
>Here's my tech question. I am getting my 1725 engine rebuilt and now
>find the camshaft needs to be re-ground. I've gone all the way in the
>piston dept. and have installed the 60 over pistons. I'm running the
>southern California). I'd like to increase low end acceleration as
>much
>as possible while still having a good "top" end and reasonable idle,
>which I know is everyone's ideal.
By cam alone, it is not possible to get more low end torque without
sacrificing top
end power. This is the sacrifice we make when tuning with the cam.
The 60 over pistons help with both displacement, and added compression.
Compression will give you power across the revs though.
Do a little head work, port the intake and exhaust to the head ports.
Put in flat tops, or mill the head.
Buy a header from S.S. "Be sure it fits and doesnt leak".
This will gain you 10 lb ft of torque and get you to about 100BHP.
If this is not quite what you had in mind, you can augment the added
compression with a little camming, to get to around 110 BHP.
Yes, the idle will be a little lumpier, the low end will be a little
missing,
but the top end will be a plenty.
I have two recipees for cams.
1) Street/strip 265i/275e 1000RPM idle 2500 to 6500 power band
224,232 (at).050
~110BHP to 120BHP
In my car right now.
2) Race/rally 295i/305e 1200RPM? idle 3500 to 8000 power band
234,246 (at).050
~140BHP to 150BHP
Just about ready for dyno.
Jarrid Gross
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