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Re: Compression Ratio for pump gas
[Re: Justins72]
#1217376
04/23/12 12:12 AM
04/23/12 12:12 AM
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Joined: Jan 2007
Posts: 7,664 IN
ahy
master
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master
Joined: Jan 2007
Posts: 7,664
IN
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Quote:
Its bored .030 over stock stroke. Any suggestions on a hyd roller cam? For compression i should aim for around 9 with iron heads and around 10 with aluminum?
That's in the right ballpark for CR.
On the lifter debate... if you were putting in an engine built from a Magnum core (designed for roller lifters) I would say no doubt run the roller with the excellent well developed OE lifters and a suitable new or re-ground cam. Starting with a 340 flat tappet... not so sure its a good idea to run roller in a mild performance build. Besides cost, many require a bronze OP gear which can be short lived plus it takes some setup. With high zinc oil, the FT lives well I believe. Even with "belt and suspenders" meaning a nitrded cam and EDM drilled oil hole lifters its cheaper.
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