Quote:
Originally Posted by camgrinder
I do a version of the 993 super cup profile on the stock 964 cams. Works very well for a street driven engine. Basically I take the standard super cup profile and widen the lobe centers to 114 degrees. Its working better than the DC-20 profile in 3.6 litre engines.
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John's cup solid lifter cams worked very well on my 993 motor, though I think we did 113 degrees and clearanced the pistons a little.
With RS valves, VRam and 7500 rpm redline we ended with 330 hp (300 at the wheels dynojet) on race gas with an extremely wide torque curve- over 275 ft lbs from 3200 through 6200. ITBs would let you go with a bigger cam for more top end power, but piston clearance and streetability become issues.
I do like the ITB idea- VRam is very good for low end torque but a bit heavy, or there are things to recommend the '95 993 plastic intake if low end torque isn't a big deal and the ITBs prove difficult.
I'd also suggest bigger RS sized valves if budget allows- the stock 964 valves will cut power.
Exhaust- the 993 was very good, the 964 not as much. You should find a bit of power with good headers.
I'd consider building the motor to rev to 7500+. It's difficult to do on the cheap, but area under the curve is significantly improved.