08-25-2008, 05:16 PM #1
RIVA Reduction Nozzle RPM question...
Say you are running a 83mm ring and jump down to a 82mm or 81mm ring. Per 1mm, what is the effect on RPM?
08-25-2008, 06:06 PM #2
I have read were guys see 80 - 100 rpm difference.
At my altitude it is only 50 to 60 rpm.
that is for 1 mm ring change.
08-25-2008, 06:15 PM #3
You are at 500 feet above sea-level, right?
08-25-2008, 06:19 PM #4
08-25-2008, 06:20 PM #5
I usually see 40-60 RPM difference in changing the venturi rings.
08-25-2008, 06:36 PM #6
08-25-2008, 06:48 PM #7
- Join Date
- Aug 2006
- Gonzales, La
Another way to put it. . . if you go from stock (83.5 mm) down to 81 mm and add enough power to keep the rpm the same, you gain right at 2 mph.
08-25-2008, 08:57 PM #8
08-29-2008, 03:09 PM #9
what size would the riva reduction nozzle be without a ring? and can it be runned with out the ring?
08-29-2008, 04:34 PM #10
- Join Date
- Jan 2007
- Lakeland, FL
88mm without a ring, though much of the venturi is the same size as OEM. Probably not the same as being bored out 88mm all the way. You can run without a ring, but the effectiveness is uncertain.
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