Thread: new pitch ?
10-19-2006, 06:24 PM #1
new pitch ?
i am turning my trued 14/20 7320 rpms at 71 mph. i know i need to re-pitch, but to what and will i see a speed increase or is it just so the engine isnt turning to much?
10-19-2006, 06:45 PM #2
- Join Date
- Nov 2005
- All over
10-19-2006, 07:01 PM #3
I would also say a 14/22 ---now keep in mind that a 14/22 will bring your rpms down a hair, but you may still be a tad on the high end (still above 7200) which is where you should be considering the time of year that it is.
If you put on a 14/22 and run....say 7230's in this season, then you should be spot on for the summer season where you will see approx 80-100 rpms less on the exact same prop in 85-90 degree weather.
Hope this helps.
10-19-2006, 07:43 PM #4
You need one of Tommy Jordons pitch gauges It will pay for its self after 1 use I would go 1 increment at a time,say to a 21 if you dont turn over 7280 I would call it good.That way when it heats up next year,It should be easier for you to stay in the 7200 range.Not to disagree with anyone,but to give you a broader spectrum.Ive been making good progress going with the less pitch/more rpm theory.I think you should hit 72.6-73.2
10-19-2006, 08:02 PM #5
- Join Date
- Apr 2006
- South MS
When my ski was single pipe non ported, with similar mods to yours plus 3 degree advance keyway, mine turned a 14/22 7200rpm in the heat of the summer and was good for 77mph+
You should be good with 14/22- 14/23
10-19-2006, 08:52 PM #6
10-19-2006, 09:02 PM #7
Call carl at island.
I have herd that 1 degree equals 100 rpm, but i guess that all depends on. . .
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