High Altitude prop question.

[S.D.Brian]

Hey Everyone,
I have a 1988 17’ galaxy open bow fish and ski boat with an inboard 2.5li Mercruiser alpha/gen 1.
My question is- I live in San Diego, and I take her out to the local lakes. But I also go up to the sierras to do a lot of fishing. I want to start taking the boat but don’t want to re jet the carb every time I go. Can I just swap out my current prop for a High Altitude prop?If so any recommendations( $150 is my max I’d like to spend) I’m only up there for a week at a time so re jetting each time I go sounds like to much.
Any and all recommendations are appreciated.
Tight lines.

Brian.

 

[alldodge]

Welcome
What ever prop your using now find one the has 2 inches of less pitch then current.

Exp: 19P go with 17P

 

[jimmbo]

How much higher in Altitude? What is you WOT Rpm at you usual Location? And what is the WOT Range of the Engine.

 

[froggy1150]

Remember it's about the air. With less available o2 per volume of air because it's less compact your air/fuel ratio will be off.the only way to truly correct this is to adjust fueling.

 

[froggy1150]

Altitudes

For small changes in altitude, carburetors will compensate without any modifications. For larger altitude changes, carburetor jetting adjustments may be needed. A rough estimate is one to two jet size reduction for every 1,000-foot elevation increase.