Altering length of dwell section vs header - tuned pipe.

Header length decides when the whole push/pull pulse action happens, and dwell length decides timing between the push and the pull, right?

What does a shorter/longer dwell section do for the powerband vs a shorter longer header? Other than just change the whole tuned length.

When is altering the dwell instead of the header a good idea?

This guy uses a variable dwell to tune in the pipe.

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

Lenght of header+divergent cone should match up with exhaust timing - when exhaust opens?

Dwell section should match up with when transfers close kinda sorta?

??? (edited)

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

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

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

#CrazyWayne™ rocks. #CrazyWayne /

Yes and no or no and yes

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