03-18-2007, 11:16 PM #1
- Join Date
- Nov 2006
Prop Pitch For Gp1390r W Triples??
I am in the process of turning my gpr into a big bore. 1390cc with factory pipes, novi , race fuel, old style pump. i was thinking of starting with a 15/22 for a baseline, what do you guys think?? Thanks Sam
03-19-2007, 12:25 PM #2
Might want to ask your portsmith what the target rpm is for this motor. I am sure alot of the guys here would be able to help you out if that info was available. Also you might want to consider moving up to the HO pump with those tripples.
03-19-2007, 02:54 PM #3
- Join Date
- Nov 2006
I would like to turn 7900-8000 rpm. I would like to get the ho pump but I have several concord props laying around and would like to use what ive got. But one day i will get the ho pump. thanks sam
08-03-2008, 09:20 PM #4
I searched until I found this topic. I was going to start a new thread but I was sure one already existed.
I have a Lowell 1390 Triple with HO pump, Advent, and V forces. I am currently running a 15/25 Dynafly but cant spin it enough in the hot temps... 105 here...
I am still on the rich side and will make up for that but Im curious as to what people are using for prop pitches....
One more thing, stock carbs....
08-04-2008, 05:16 AM #5
I have a 1300 and run a 14/22 in the summer.7700 to 7800 rpms. In winter
that spins 8000 to 8100. Then I go to a 23.
I have to go to a 14/20 in heat to run between 7900 and 8000. Or a 17/22
08-04-2008, 08:26 AM #6
"I am currently running a 15/25 Dynafly "
what are your RPMs
what nozzle are you using (85 or 87)
who pitched your 15/25
08-04-2008, 10:21 AM #7
08-04-2008, 11:14 AM #8
08-04-2008, 12:20 PM #9
I have a concord 14/20 in good shape. How much difference in revs would the concord be than the DF???? Im not sure if the concord will work in the HO pump but if not I might just try it in the old pump....
08-04-2008, 01:34 PM #10
I'd try the concord in the HO pump
HO pump works better with any impeller than the old pump
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