Re: which valves to buy? -- Turbo Mopar Main Forum

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Subject: Re: which valves to buy?

Author:
tonyz2897

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Date Posted: 14:30:14 01/19/03 Sun
In reply to: BuRn__ 's message, "which valves to buy?" on 10:27:21 01/19/03 Sun

I may be wrong, but I don't imagine you'd see much gain from going with the oversized valves unless you also did some port work to the head to make it flow better. Plus you'd have the cost of machine work necessary to install them. If you're going to port your head while it's off, it might be something to consider though.
Just my .02
Tony

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[> Subject: Re: which valves to buy?
Author: BuRn__ [ Edit \| View ]	Date Posted: 19:19:41 01/19/03 Sun im not gonna port the head, but was told when i take it to have it machined to "mill your head to minimal tolerances". would that have any effect on the valves? also, i plan on replacing the valves and all that stuff myself, just taking it to a shop to have it machined. is there n e thing i should watch out for? [ Post a Reply to This Message ]

[> [> Subject: Re: which valves to buy?

Author:
tonyz2897
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Date Posted: 11:19:40 01/20/03 Mon

I wouldn't go any farther than what's necessary to get the head back into spec as far as the flatness of the gasket surface. Planing excessive material off of the head will increase your compression ratio which would increase your octane requirement at high boost. In other words, increase the compression too much and you may get detonation with pump gas at a boost pressure that you would otherwise be able to run. I've also heard that compression made with boost makes more power than the equivalent static compression. I have never seen documentation to back this up though.
Tony

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[> [> [> Subject: Re: which valves to buy?
Author: BadAndy [ Edit \| View ]	Date Posted: 07:53:03 01/25/03 Sat That's not the worst of it.....you forgot the fact that milling changes your camshaft timing as the area between pullies has been shortened. [ Post a Reply to This Message ]