Bombur@snet.net wrote:
>
> Having done some performance related engine modifications I am considering a
> header to squeeze some more HP out. I once read that the only effective
> headers are those which are harmonically tuned to the exhaust pressure
> waves. If correctly tuned they take advantage of the low pressure areas
> between the high pressure waves to greatly enhance engine breathing. In
> looking at TRF catalogue, I see that the headers listed have the front three
> cylinders flowing together, and the rear three likewise. Given the firing
> sequence of the 2.5L I can't see how such a header design would do much.
> Can anyone enlighten me?
>
> Peter Firla
> 74 TR-6
Peter,
The overall length of the header pipes is not significant enough to
warrant tuning.
Tuning is most beneficial of very high compression "big bore" engines
with lots of distance between one and two cylinders and the collector.
Besides, there is already little enough room for headers.
Tuned pipes would be VERY difficult to install without frame
modification.
Make sense????
Regards,
TonyR
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