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  Prop: 90-HP Nissan

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Author Topic:   Prop: 90-HP Nissan
EddieS posted 05-24-2002 01:29 AM ET (US)   Profile for EddieS   Send Email to EddieS  
I took my '66 out today for its second sea trial. It has a 1998 Nissan 90 with a Stainless prop. At WOT I was able to reach 5100 RPM's Max, but I had to trim it to the verge of porposing in order to achieve 5100. Otherwise my max was 5000. The manual says 5000 to 5500 WOT would be correctly propped. Should I stick with this prop or should I replace it with a prop with less pitch? I did not have a GPS on board at the time, but if I had to hazard a guess I would estimate top speed at about 42 MPH

Any advice you guy's have would be great.

Ed

PFSQUAN posted 05-24-2002 08:37 AM ET (US)     Profile for PFSQUAN  Send Email to PFSQUAN     
5100 sounds on the low side, but since your boat is old, it could be heavier than normal if water has seeped in between the foam. I would definitely try another prop with an inch less pitch. Out of curiosity, do you know what other size propellers Nissan offers?
Salmon Tub posted 05-30-2002 06:55 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
I have the OEM prop that is 17" pitch. At least it is the prop that came with the engine (Nissan 90) and has 13.## x 17" stamped on it, their prop chart does not list this size. In any case, I only brought it up to WOT once, and that was way back during break-in. I hit 4900 with it. I never pull skiers and never goose the throttle so I am not worried too much about lugging the engine. I did buy an aftermarket 15" which gave me 5300 rpm at WOT. I don not use that one though. With the OEM one I did get 40-41 mph at 4900 rpm and that is plenty for me.
Clark Roberts posted 05-31-2002 08:21 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Eddie, suggest you select a prop that will allow wide open throttle (WOT) rpm at 5500 to 5600 rpm! This will allow engine to develop its max hp and have good mid-range accelleration. Also fuel economy should be better! You need to pick up about 400 rpm and generally an inch of pitch will net 200rpm either up or down so go down two inches in pitch and you should be dialed in at approx 5500rpm... Happy Whalin'.. Clark ..SCN
jimh posted 05-31-2002 10:25 AM ET (US)     Profile for jimh  Send Email to jimh     
[Reworded topic--jimh.]

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