WOT rpm?

[gomester]

I have gotten mixed answers but I have a 1995 Viper Cobra 188 single console with a 150 Yamaha pro-v. Not sure if this even matters but 25p prop and 6inch setback. What rpm should I be getting on this motor for optimal performance at WOT?

I have been told between 5500 - 5800 rpm but then read somewhere that it is 5,000. Also, anybody know what the limiter is as well?

[almetelo]

For the 2 stroke motors optimal RPM at WOT are around 5500RPM more or less

[Joe Raimondo]

Rev limiter should kick in at 6200 RPM.
Joe R

[rodbolt17]

the rev limiter is an engine protection device NOT a propping goal.

all the US market P150 motors used 4500-5500 RPM as an operating range with a note to prop closer to 5500 than 5000.
but no extended running above 5500 RPM.

[FabricGATOR]

How about a pair of 2000 150 HP OX66's pushing a 23 foot bluewater sportfish? I'm getting 4400... seems like it might be low.

[rodbolt17]

about 1000 RPM low.
but I dont know if its one engine,both engines or the hull.
a quick test with test wheel number YB-1626 willl tell you.

[gomester]

Thanks. That is very helpful.

the rev limiter is an engine protection device NOT a propping goal.

all the US market P150 motors used 4500-5500 RPM as an operating range with a note to prop closer to 5500 than 5000.
but no extended running above 5500 RPM.

[gomester]

Any idea what would be the v best pitch prop for that setup? Running a 25 pitch currently but seems to possibly be too underpowered.
Thanks.

[99yam40]

Performance Bulletins | Yamaha Outboards

See if you can find something like your set up here to see what prop they used and what it was doing

[gomester]

rpm/speed

So I took out yesterday with prop to pad at 3.5 inches, 6 inch setback, 25p tempest 3blade prop and was running 5300 rpm at about 57mph by myself, empty livewells, and about 3/4 tank of gas. I think I am really close if not already there. do you think a smaller pitch prop would increase the rpm's too much?

Performance Bulletins | Yamaha Outboards

See if you can find something like your set up here to see what prop they used and what it was doing

[99yam40]

Not sure what this means

So I took out yesterday with prop to pad at 3.5 inches,

Did you find anything at the web site I posted?

[gomester]

Well there are no boats that really match mine there so tough to gauge. I was simply explaining my setup and what rpm's and speed I was getting with the engine heighth, setback, rpm's, and prop pitch. I am a little confused on what you don't understand.
Thanks for checking though; I think I am nearly at optimum performance at this point.

Not sure what this means


Did you find anything at the web site I posted?

[Bilge Rat]

You are close,
might consider sending your prop to a good prop shop and let them clean it up.
Give them your set up and rpm, you need about 200 RPM.
They can tweak it to get what you need.

[FabricGATOR]

Someone told me 1" pitch equates about 150 rpm.
I'm just relating what the guy at the shop suggested from his experience...
Anyone?

[gomester]

Would another quarter inch of engine height give me that extra couple hundred rpm do you think?