06-09-2010, 11:08 AM #1
155mm pump liner and prop vs. 160mm pump liner and prop?
assuming that you have the same rpms with the 2 setups, what are the performance gains you get besides less cavitation with the 160mm liner and prop using the oem stator?
i was thinking i should expect better acceloration and a higher top end?
this is only achieved by keeping the rpms up with the correct pitched prop.
bigger pump = more water flow?
06-09-2010, 11:17 AM #2
...with the right setup you would think you can achieve a higher top speed if your pushing more water
06-09-2010, 03:45 PM #3
I've lost a couple of MPH on top with the 160mm liner and stock pump.
I'm running the RIVA B wheel, R1, and Riva I/C.
155mm pump and 14/25 impeller - 8200 RPM's 79 mph GPS
160mm liner, 14/16 impeller and stock stator/nozzle - 8200 RPMS's 75 GPS (+1or 2, water wasn't smooth)
The cav is 100% gone and the holeshot seemed better but that's just my feelings as I don't have a way to accurately measure gains there. The 155mm pump just cavitated all over the place which I'm sure doesn't help holeshotting.
06-09-2010, 04:29 PM #4
06-09-2010, 04:36 PM #5
06-09-2010, 05:16 PM #6
06-09-2010, 05:47 PM #7
Yep, the 14/16 is correct.
It was a 13/18 which for me had a blip of cav still and rpms ~7800. Had it repitched to 14/16. The 160mm impeller takes a lot of power to turn. Remember I'm using the B wheel which is RIVA's low boost wheel.
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