prop recomendations

[26aftcab454]

bought a perfect 1981 Glastron SX 190 with a slightly tuned 300hp 350 chevy.
the prop is a SS 3 blade "5070 14"x19" the drive is a Alpha 1.
The boat is light weight bow rider -total rebuild in 2010- no water soaked foam-and runs good at
50ish mph till 4000rpm WOT. no more.
I'm thinkin it should hit higher WOT in the upper 4000s rpm closer to 5000 rpm range at a higher speed. It has a heck of a holeshot & rapid acceleration but thinkl it could be better.
sorry no more info .:facepalm: All I can find.
Input is appreciated.

 

[Robbabob]

Re: prop recomendations

What is the max HP rating for that boat?

 

[26aftcab454]

Re: prop recomendations

What is the max HP rating for that boat?

Do not know max hp rating--originally came with 5.0 220hp.

 

[reddogg]

Re: prop recomendations

Going up or down a pitch is worth about 200rpm.

red

 

[QC]

Re: prop recomendations

Do you have the gear ratio? If it's a 1.5 then the tach is off, or some other piece of data is wrong.

Whenever anybody says they have great hole shot and yet can't get to WOT RPM it is a clue as to bad data Garbage in = garbage out. Sumpin's garbage

 

[26aftcab454]

Re: prop recomendations

now I'm thinking it may be the tach too-- it runs great---tach says I'm idling at less than 500 rpm and cruise 28 to 30 mph at 2500 rpm.
it makes sense

 

[QC]

Re: prop recomendations

Ding, ding, ding, we have a winner. Check the back of your tach for the proper setting for V8

 

[26aftcab454]

Re: prop recomendations

thx