Oem ss propeller cobalt
 

Hi, finish restaure my boat 272 year 1994 with bravo 3 ratio 1,8 and mercruiser engine 454 385 Hp… Please, that i want to know what is the top speed and what is the propeller pich correct from factory for this boat?


Thanks in advance


Erick

I don't remember the exact pitch but it is the old non-cupped 3x3's in the low 20's.
There are multiple options now if you would like to discuss them, give us a call.

Brett

Thanks, today i tested a bravo 3 ss pich 22, and i can not belive is take only top speed 45 milesx h and 4800 rpm full trotle wiith only few trim up, 3 persons, in good sea water conditions fuel only 1/4 .

The engine mercruiser said this engine the wot it is 4800-5200.... The problem is i can not go to picher up aprox 300 rpm in bravo 3.......on the contrary i have to go to 20 pich it is crazy, i will lost top speed, in the test i feel the engine very strong Great,....i think the performance will be around 50-55 miles.
The gauges are new farias
4500 lbs- 27 '
It is really the velocity of this boat?

This is probably a long shot, but make sure the air cleaner is very clean, I have had similar boats and have seen a dirty air cleaner make a couple hundred RPM difference.
If it has a painted bottom 45 might be all you"ll get

A set of 20P propellers could actually raise your speeds if the rpm grows enough.
It is rather strange that your slip % is 19%. This is a touch high for your application.

Brett

Hi, Breat thanks for your answer

If we go to 20p , will incrase 300 rpm more tourque and will be 5200 rpm the max rpm of this engine wot, it is correct? please confirm, the cuestion is : how much aprox. in your opinion can incrase in miles the top speed?, Now we are in 45 miles

Do you sale 20 ss for bravo 3.?

Thanks in advance

Erick

Looking back through this post and seeing you are at 4800 does put a little damper on speed growth. 2 inches of less pitch will allow the rpm to climb aprox. 400. This will put you at the max allowable rpm as you stated for your engine. In turn this will not produce additional speed unless the slip % drops.
My reference to smaller pitches gaining speed would only be relative in a situation where the rpm room for growth would in the 5-600 range. In these situations the additional HP can pull the smaller pitch more than 400 rpm and then the speed comes. If your engine stops making HP at 5200 and/or a rev limiter is in place, you will stay at the same speed unless, again, the slip drops.
Got to wonder if the 22's a little messed up?

Brett

Hi Brett, ok... I understand your point thanks for all your information