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911-32 911-32 is offline
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Join Date: Sep 2003
Location: London
Posts: 644
Question How easy is a cam change?

In the CIS and Aggressive Cams thread John Dougherty very kindly answered my question regarding what is the most aggressive cam you can use with a std 3.2 Motronic engine:

"3.0 with cis would be the 964 grind.

3.2 motronic gets the super cup grind

3.2 with factory pistons and aftermarket management my DC24 grind (Valve to piston clearance will be close and need piston notching)

3.2 with JE pistons and motec? anything goes

Remember hotter cams need more compression

John Dougherty"

So, the next question is, how much work is involved in changing to a 993 Supercup grind cam? Nobody in the UK seems to have expereince with this cam in this engine. 964 cam grind, sure, but Supercup, never done it. My mechanic asked what the installed valve spring length would be? And also asked about preload on valve springs.

The thing is, I don't need to do a top end rebuild. My 1989 72,000 mile engine burns virtually zero oil and seems very strong compared to other cars. I just want more horsepower after years of DEing it in std form and more lately with stiff suspension and big brakes. The car will get SSIs and sport exhaust with a custom burned remap at the same time.

What do you guys think? What should I do? Any thoughts gratefully received.

Old 01-12-2005, 08:21 AM
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