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faq1 COOPER TUNED PIPE LENGTHS
COOPER PIPES TUNING LENGTHS 03/07
Determining pipe lengths is very subjective
and includes so many variables, i.e. available
horsepower, engine seal, prop size, if
the boat runs wet or loose on the water,
density altitude, shaft depth and angle,
and many more too numerous to mention.
The pipe lengths published here are a guide
to help as a beginning point and not intended
as absolute lengths as it relates to your
particular application.
QHP 21 7" TO 81/2"
QHP 45 81/2" TO 10"
QHP 67-1.00 10" TO 11 1/2"
QHP GAS 12" TO 131/2" Measure from the
edge of the outside of the engine where
the manifold bolts on, around the curves
back to the weld.
QFE 21 81/2" TO 10"
QFE 45 10" TO 11"
QFE 67-80 10/12" TO 12"
QFE 90-1.00 12" TO 12 3/4"
QFE-2 2.25" dia. 11" TO 12"
WRAP TO CENTER GAS PIPE
14 1/2" to 15 1/2"
100 Degree GAS pipe 13" to 14"
All cooper GAS pipes are measured
from the inside of the manifold
where it bolts to the engine around
all the curves to the weld.
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