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Re: Tuned headers


On 7 Jan 2004 at 17:07, phillip bradfield -- volkshaus wrote:

> >> Hey all. Just wondering how much of a difference a tuned header will make on
> >> an engine. By tuned, I mean a header that has equal length tubes from each
> >> exhaust port to the collector. This compared to a header that has unequal in
> >> length tubes.
> >> 
> > Ths Bill Fisher book covers this rather well. I think he claims 10-15%. This
> > should be balanced against the downside of imperfect fit and ground
> > clearance problems. Note also that there are differences in length between
> > different brands of OEM exhausts.
> 
> Wow. 10-15% - if that's accurate, that's significant.

You really should check the book rather than take my word for it. It's been 
quite a while since I studied that section. I DO recall that he makes the point 
over and over again that the exhaust can make the biggest difference of any 
bolt-on modification.

-- 
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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