13p to a 15p prop

[stinkies daddy]

today i went to a 15 from a 13 pitch prop. got a really good deal! called arount first and each boat shop said jump all over it. my boat has a 40 hp mariner on it, w/ a 13 pitch prop. I got a 15 pitch for 50 bucks. from what i understand i will lose bout 300 to 500 rpm's on the hole shot but will make it up on the top end w/ no rpm loss there thus gaining 4 to 5 mph. what do y'all think?

[CatFan]

There is no free lunch. I don't think you can expect to jump to a prop that's harder to turn and not lose top-end RPMs. You want to turn close to your OB's rated maximum RPM to make your motor happy and avoid carbon build-up issues. It depends on how close of a match your 13P prop is to your rig's weight and motor whether you will see any performance improvement or hit.

[FisherMike]

About all I can say is, I believe there's going to be a big difference at some point.
Not too sure about where.
Theres a prop selector guide on AMD's forum you may want to check out.
I'll post it if I can find it.

Here you go.

http://appcenter.mercurymarine.com/p...ljGr5XDqQLvpAe

[stinkies daddy]

About all I can say is, I believe there's going to be a big difference at some point.
Not too sure about where.
Theres a prop selector guide on AMD's forum you may want to check out.
I'll post it if I can find it.

Here you go.

http://appcenter.mercurymarine.com/p...ljGr5XDqQLvpAe

Thanks but it didnt go back far enough for my moror

[asklouis]

Prop selection will depend a lot on how your boat is loaded! Install the new prop and load the boat the way you normally fish then see if your motor will reach the rated wot rpm. If it is too low the prop pitch is too high.

[stinkies daddy]

Prop selection will depend a lot on how your boat is loaded! Install the new prop and load the boat the way you normally fish then see if your motor will reach the rated wot rpm. If it is too low the prop pitch is too high.

The boat usually runs at 5500 rpms and the guide i found said that it should only drop the rpms to 5200 which is acceptable

[asklouis]

The boat usually runs at 5500 rpms and the guide i found said that it should only drop the rpms to 5200 which is acceptable

If 5200 is in the acceptable range you are in good shape. A good rule of thumb is one inch of pitch normally equates to 200 rpm but it varies a little each way depending where it falls on the scale.

[stinkies daddy]

If 5200 is in the acceptable range you are in good shape. A good rule of thumb is one inch of pitch normally equates to 200 rpm but it varies a little each way depending where it falls on the scale.

That is zactly what i saw also

Thanks for your help

[foul hook]

There are numerous pop mfg. around. You can get the info you need fron the internet. You need th eboat info and the prop info and the will list 2-3 props that will perform . They have years of exp. I have call some direct and they were glad to help. Guessing can get expensive.

[hack_62863]

if you find that you don't like the way it runs any GOOD prop shop should be able to change the pitch for you