Re: Altering length of dwell section vs header - tuned pipe.

Alex Degnes /
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Reread jennings.

For max hp with one stage diffusor:

-Header length should be 6-8 times header diameter.

-Header area should be 15-20% more than exhaust port area.

-Big end of divergent cone should have 6.25 times the area of its small end. Length is given by its taper (6-9*).

-Convergent cone taper should be 15-20*, length again given by taper.

If you follow this when building/altering your pipe - dwell section length is where you can tune in your tuned length.

Tuned length:

(Extiming x 1700)/rpm

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