Prop question?

[89sport]

I have an 89 sport and I dont know off the top of my head what size prop would fit my boat. I know of a guy that is selling an acme four blade prop 13x12.5 Lh 1 1/8 and was wondering if that would fit my boat and if it is the right one??

[rsterling]

Im not 100% sure but I belive that boat is a right hand rotation.

[DanielC]

Go sit behind your boat and look forward at the propeller. If the boat moves forward when the propeller is rotated clockwise, you have a right hand propeller. Most Correct Craft boats have a right hand propeller. The LH in the number of the prop you are looking at means Left Hand. Probably the wrong propeller.

[TRBenj]

Definitely the wrong prop. Wrong rotation, wrong shaft diameter and wrong pitch.

Your '89 Sport should have the 1.23:1 PCM tranny, so the stock prop would have been a RH 14x16 3-blade, with a 1" shaft. Acme makes several models (both 3-blade and 4-blade) that would well on your boat. The one that works best depends on how you use it.

I have tried both the Acme 422 (12.5x15.5 4-blade) and 470 (12.5x15 3-blade). The 470 is the better prop. There are a few other choices that I dont have experience with yet. I know there is a 4-blade with less pitch (15"). There is also the new 1442 3-blade that is larger in diameter than the 470. Your best bet is to give Bill Weeks at Acme a call and tell him how you use your boat. He will make a good recommendation.

[triplered]

It's also possible that your '89 Sport has a 1:1 transmission,
in which case the OEM propeller would be different. The
Power Plus transmission was introduced that year, but I'm not
sure if it was actually "standard."

Identify your transmission first before choosing the propeller.
There should be an identifying gear ratio on the top of the tranny.

[TRBenj]

This is true- make sure you ID the tranny first. While the overwhelming majority of the 89-94 boats have the 1.23, the 1:1 was still available.

Either way, as long as the motor is original, you will need a RH prop with a 1" shaft.

[M3Fan]

The 470 is the better prop.

... if your're comfortable turning 200 more RPM WOT. Regardless of what the motors can technically handle, I'd rather keep mine around PCM's WOT specifications, just for peace of mind. Of course if my engine was not stock, I'd probably think differently.

[TRBenj]

The 470 is the better prop.

... if your're comfortable turning 200 more RPM WOT. Regardless of what the motors can technically handle, I'd rather keep mine around PCM's WOT specifications, just for peace of mind. Of course if my engine was not stock, I'd probably think differently.

The difference is really only 180 RPM, but youre right :razz:

An 89 would only have had 240 horse, so WOT RPM should be ~4400. An increase to 4600 would certainly not put the motor in any danger of self-destructing. A GT40 with a 4800 max RPM rating is physically no stronger than a bone stock 240 horse 351w. The 240 hp motor simply doesnt breath as well and starts to run out of breath above the rated RPM.

The story might be a little different if you are starting with an HO motor that is already turning close to 5k. 5200 RPM may be pushing some people's comfort level (not mine!), which is understandable.

I started with a 240 hp motor and went from 4400 to 4600 when switching to the 470. It increased performance all across the board- holeshot was terrific and I gained ~1MPH on the top end coming from a 4-blade OJ Legend.