Hi all im using 2 php500 pumps what would be the best internal diamerer of the jet log and the best angle ? .was thinking 1.5 inch and 15 degrees
.any imput would be greatfully accepted .
Do a google search & see what the manufacturers do.
JW 
Iām using 20mm id on my jet log orrifice with a roughly 35mm thick walled housing cut on 11/12 deg. Using HP500s on 6ā.
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Been trying google not much success
What horse power are your engines?
GX270s in warmer months 390s in winter to generate more heat for heat exchanger. Ph 0272693054 if you need more info