What size prop do I have?

[jimmywayne]

I have a 1986 searay with a 140 h/p mercruiser I would like to buy a prop that will give me more speed I just don't know what size I can go with anyone have an ideal what is the largest size I can go with? Thanks Jimmy

 

[Turbo1]

Re: What size prop do I have?

As a general rule, in order to help you determine what you "need", we need to know what you "have"..
That would include prop make/model and size, material and what max RPM you can achieve at WOT and a GPS speed if that is available.
As most will tell you here, there is not a specific prop "labeled" for any one boat...therefore we must have a few of the variables you have now.

 

[Dunaruna]

Re: What size prop do I have?

I have a 1986 searay with a 140 h/p mercruiser I would like to buy a prop that will give me more speed....................

Wouldn't we all!

It is not as simple as just replacing the prop, what you already have may be the best size for speed. You need a base reference before you can successfully change props, need to know what you currently have and what WOT you are achieving. Then you can begin to calculate if a different pitch will help with speed. None of these calculations will work properly if the motor is out of tune. Waxing the underside of the hull is also a cheap way to improve speed.

Step one - tuneup/service (including leg)
Step two - prop for WOT