John Knox wrote:
i have read of the importance of insuring that
manufactures specs on back pressure are not
exceeded, but i can find no numbers for my
yanmar 2gm15. does 48" from bottom of water
lift to top of transom gooseneck using 1.5" hose
sound excessive?
john


I don't know. How far down does the outlet drop from the top of the
transom gooseneck?

My 1/2/3 GM installation manual quotes 27 inches of water maximum
exhaust backpressure. This is _not_ the same as the vertical lift.
It can be measured by tapping into the exhaust elbow and comparing to
ambient pressure.

Evan Gatehouse