Re: Big bore

Posted by Craig Hendrickson On 2013/5/11 17:57:45
Fred Puhn Quote:
A blower will not only effectively increase the displacement but it will also somewhat overcome the poor breathing of a flathead engine. If you do it use a positive displacement blower like a Rootes. You get a lot of low end boost and there is no lag like you get with a turbo.


Sorry Fred, "there is no lag like you get with a turbo" is an old wife's tale. It all depends on the engine size, cam and turbo size. I designed and sold a couple of hundred of the H-O TurboForce systems for 1970-79 Firebirds, primarily Trans Ams during the 1970s. "Turbo lag" was the least of our problem. Mostly the problem was traction due to excessive torque, even from a standing, closed throttle start. H-O also adapted the blow thru design to some 305 & 350 Chebbies at the time. Same result.

On an Packard S8, I think a turbo would be the way to go. Particularly an EFI blow thru setup like Eric (nee TurboPacMan) was planning.

Craig

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