"Musson, Carl" wrote:
>
> Speaking of Exhaust Manifolds. What are the advantages to going to what I
> believe is called a 4 to 1 manifold/pipe setup. I have seen two for the TR3
> - one has the junction after the bend to the tailpipe and the other before
> it.
The 4-pipe into one collector arrangement is primarily for very high
continuous engine speeds. If you're running the engine constantly in the
5500-7000 rpm range, that's the type of manifold to use, presuming the
pipe lengths are tuned to the rpm range required.
The one with the collector before the bend is certainly easier and
cheaper to make, but from the sound of it, the lengths of the pipes
would likely be a bit too short for a TR4 engine running in the rpm
range mentioned above.
For all-round driving, the 4-2-1 header, with branches of the proper
length, would provide a little more average power across the rpm range
than the 4-1.
Cheers.
--
Michael D. Porter
Roswell, NM
[mailto: mporter@zianet.com]
`70 GT6+ (being refurbished, slowly)
`71 GT6 Mk. III (organ donor)
`72 GT6 Mk. III (daily driver)
`64 TR4 (awaiting intensive care)
`80 TR7 (3.8 liter Buick-powered)
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