[Fot] Exhaust header question

[David Cutter]

Mike,

Jon Wolfe in his Spitfire racing guide says: "UK aftermarket exhaust are
available...on the Spitfire they are of the 4 into 2 into 1 design which is
often considered best for tuned road use whereas the 4 into 1 configuration
is generally preferred for high revving race and rally cars...I have
experimented with both designs and the 4-2-1 does have a significant
mid-torque range advantage, whereas the 4-1 gives better top end power."

Nothing explicit in the Kastner material, but seems to imply 4-1, i.e. the
Chuck Gee collector pictured p.235.

Cheers, Dave





On Thu, Jul 27, 2023 at 11:38 AM Mike Harmuth via Fot <fot at autox.team.net>
wrote:

> Hi folks, I've been looking over my setup (1296, billet crank, head work,
> 2 SUs etc) and I'm wondering about a header change. I currently have one of
> the Stahl headers from Joe Siam but I was wondering if I'd gain some power
> (high end) with a 2 into 1 style, taking advantage of the scavenging.  I
> have one now in the parts bin, 1 5/8" diameter that I only need to weld a
> bung on for the AFR probe. I've used it in the past with an engine (SCCA
> legal) without this level of prep so I'm not sure it's up to the task.
>
> My Stahl header needs the engine out (current condition) to be removed so
> it seems like a good time to try it but I'd hate to take a step backwards
> and have to pull the engine to put the Stahl back in.
>
> Any thoughts on this?
>
> thanks
> mike h
>
>
>
>
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