snowthrower
Seaman Apprentice
- Joined
- Aug 23, 2004
- Messages
- 40
I just bought a 1991 bayliner capri with a 3.0L alpha one. To replace my 1967 seaswirl with a mercruiser 120.
Now I thought just the refinements in engine design and the 1/2 litre in displacment would make it pull better but it is a little slugish. It will pull me up on the wakeboard OK with the wife and two small kids but the old 120 would yank me right up. I want to be able to have freinds along but I'm not sure how it will pull.
I'm thinking a reprop would help but need advise.
The new boat with the 3.0 is running a 19" pitch prop at 4600 rpm @ WOT and acording to the speedo I'm at about 34-35mph.
The recomended WOT range is 4200-4600 according to the engine cover. I did note that the engine will rev into the 2900-3000 pretty quick on the hole shot.
Should I go to say a 21" three blade to bring the RPMs down and move more water or even a four blade 20"
I wish I could swap the 21" pitch off the old boat onto the new one for a test run but they use differant thrust washers ( ya I checked ).
Also is there any diameter, cupping, or ... ?? that I should concider? If it would help the prop on there does not appear to be the factory unit and all the paint is greyed/missing, could I be cavitating?
Any one else pulling wake boards with a 3.0 that can input?
Now I thought just the refinements in engine design and the 1/2 litre in displacment would make it pull better but it is a little slugish. It will pull me up on the wakeboard OK with the wife and two small kids but the old 120 would yank me right up. I want to be able to have freinds along but I'm not sure how it will pull.
I'm thinking a reprop would help but need advise.
The new boat with the 3.0 is running a 19" pitch prop at 4600 rpm @ WOT and acording to the speedo I'm at about 34-35mph.
The recomended WOT range is 4200-4600 according to the engine cover. I did note that the engine will rev into the 2900-3000 pretty quick on the hole shot.
Should I go to say a 21" three blade to bring the RPMs down and move more water or even a four blade 20"
I wish I could swap the 21" pitch off the old boat onto the new one for a test run but they use differant thrust washers ( ya I checked ).
Also is there any diameter, cupping, or ... ?? that I should concider? If it would help the prop on there does not appear to be the factory unit and all the paint is greyed/missing, could I be cavitating?
Any one else pulling wake boards with a 3.0 that can input?