Boat prop question

codymeggs

Cadet
Joined
Feb 27, 2012
Messages
18
What is the best size prop for my 1983 90 hp Johnson model j90tlcte motor I have a 9x13 on there now?
 

hidef

Lieutenant
Joined
Aug 22, 2009
Messages
1,465
Re: Boat prop question

Do you have a Tach? Ideally you want the engine to turn around 5500 RPM at WOT with your normal load. Not knowing the size, type and weight of the boat makes it hard to determine what size prop you should be using.
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: Boat prop question

You'll have to run it with a good known tach on it and then prop it out to the correct WOT range of the mtr.
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: Boat prop question

A 13" prop sounds like maybe a pontoon or a brute of a boat.?
If you read "read this first" at the top of the page it will help you get us the info we need.
 
Top