19 pitch to small?

[m8kinulook]

ok i have a 91 maxum with mercruiser 4.3 and alpha 1 outdrive. when i purchased the boat last year the prop was alittle damaged but not enough to worrie about. it ran well into 5500 rpms at wot with old prop. i bought a new 14.5-19 last week and im now at 6000 rpms at wot (which is max ) and buddie of mine sat in the back and could hear it airating. so my question is what prop should i change to because 6000 rpms is way too high and im guessing it should run in the 4400-4800 range. or am i wrong , someone point me in the right direction.

 

[jammer]

Re: 19 pitch to small?

ok i have a 91 maxum with mercruiser 4.3 and alpha 1 outdrive. when i purchased the boat last year the prop was alittle damaged but not enough to worrie about. it ran well into 5500 rpms at wot with old prop. i bought a new 14.5-19 last week and im now at 6000 rpms at wot (which is max ) and buddie of mine sat in the back and could hear it airating. so my question is what prop should i change to because 6000 rpms is way too high and im guessing it should run in the 4400-4800 range. or am i wrong , someone point me in the right direction.

Very humble opinion here. First it should be 14.25 not 14.5. Next I would take it to 23 pitch. I noticed you said 4.3l which can be 190hp or higher. Then there is the difference with aluminum and stainless..I am assuming you have an aluminum.

Good luck.

 

[RubberFrog]

Re: 19 pitch to small?

.25 difference diameter won't make any difference. How old is your tach?

 

[m8kinulook]

Re: 19 pitch to small?

.25 difference diameter won't make any difference. How old is your tach?

all gauges are new, and tach was also replaced. every marina i talked to said the 14.5 is what that motor/outdrive called for and they just automaticaly gave me a 19pitch without any questions.