Prop pitch

[Johnallee]

I have a 2000 crestliner 17.5 mod v hull with a 90 HP evenrude 2 stroke fitch. I was not reaching my max rpms( was told 6500) so I raised the motor up one position. Now it's at the second hole from the top and my rpms reach 6500 with the motor trimmed up a little. Before I raised the motor I was having problems with the boat caveating on rough water or when I trimmed the motor up to much. I know they all will do this I just think it has more to do with the hull and the position the motor was originally in. The prop on my motor is alu. 14x17 and I have a black stainless 13 7/8x17 that I have not tried yet. Any ideas if this will help me with the all around performance of my boat or should I try something else. I'm looking for more speed.

 

[jestor68]

Re: Prop pitch

My source shows the recommended WOT rpm range for a 2000 fitche Rude 90 as 5250-5750.

 

[Lyle29464]

Re: Prop pitch

sounds like you need a lot more bite a 19 SS might be a good guess. See if you can find a dealer that will work with you so you don't buy the wrong one. ( assuming the tach is correct)

 

[Bifflefan]

Re: Prop pitch

I'm looking for more speed.

From reading your post, you probably need to buy a faster boat.
You are not going to gain more than a couple mph with small mods to what you have.

 

[steelespike]

Re: Prop pitch

I agree 5250-5750 rpm.
I think the motor is too high.Try the ss prop.
We need the info requested in the stickys at the top of the prop forum.
Do some test runs with both of your props remind us of the prop size and get us the
wot rpm and speed with a light load.
Check the relation of your anti vent plate(just above the prop) and the bottom of the boat.
Usually should be even with or up to about an inch above.pictures would be a big help.
A rough prop calculation guessing 10% slip would be about 47 mph at 6500.
the ss prop might produce 49 assuming it could make the 6500.
You should prop for about 5700.