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Author Topic:   One choice, compression or roller cam!
UFnARacing
Member
posted October 29, 2003 08:33 AM
With the money I've budgeted for next years motor this is what I have. 383 with good crank and good rods, both aftermarket. Ported vortec heads with 58cc chambers. Now to the question. I can't afford to have custom pistons that will give me over 14:1 compression and a roller cam setup. I can use flat tops and still get almost 13:1. Then go with a roller cam. Or, I can spend the cash on custom pistons and use a solid tappet cam setup.

I'm not talking about anything else but the choice between more compression or a roller cam. I think I've already made up my mind, but I'm looking for opinions.

The flat tops will have better flame travel and the roller cam will be much more aggressive giving more cylinder pressure. The vortecs are designed aroud swirl, so keeping the flame travel is good. That's probably which way I'll go.

Thanks,
Randy


dode
Member
posted October 29, 2003 10:02 AM
flat tops and roller cam gets my vote.

John

rocket36
Member
posted October 29, 2003 02:04 PM
roller cam.


Raz_900
Member
posted October 29, 2003 02:41 PM
Another for roller


BrianW
Member
posted October 31, 2003 08:57 PM
I vote for both - but if the budget is limited I'd say selecting a good matching roller cam you won't be giving up much to the extra 1 point of compression - there is a "rule of thumb" someone probably knows - something like every point in compression yeilds 3-4% more power (if I recall something in that range - works for engines from 8.5-14:1 or so...)

The key is to select a cam that will operate in the RPM range you intend to run the engine - plus try using a thin copper or steel shim gasket to gain ~.5 point of compression...

norightturn
Member
posted November 01, 2003 08:10 AM
roller and flat tops 13:1 is plenty.


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