best prop

[GroovyNautique]

I'm putting a 310 hp injected gt40 in my 1993 ski this week. I'm wondering which prop would be best for this.

thanks!

[jedgell]

RE: best prop

I'd go with the ACME #422, if you have the 1.23:1. I put one on my '95 Ski and it runs smooth and significantly reduced the cavitation when turning to the left.

[TRBenj]

RE: best prop

Acme 1442, hands down on that hull/engine combo.

[GroovyNautique]

RE: best prop

well, my problem now is that I actually have the 1:1 transmission as I discovered today. so I either need to get a left hand prop or a 1.23:1 transmission.

what kind of torque loss can I expect with a 1:1 transmission and a left hand prop as compared to the 1.23:1? not sure if I want to dump money into a transmission too? unless of course someone has one for sale here for a good price!

[TRBenj]

RE: best prop

Ah, so you had one of the semi-rare (in the 90's anyways) reverse rotation 351w's matched to a 1:1. Cool. Sorry for the bad recommendation- I was assuming you had the 1.23, obviously.

I would strongly recommend keeping the RH prop on the boat if theres any way for you to do so. Youre correct in that the easiest way to do that is to add the 1.23 trans. The LH prop that you'd want with that combo is an Acme 541, but thats not the way I would go. The hull was designed with a RH prop in mind and wont handle or behave the same with a lefty.

[GroovyNautique]

RE: best prop

since I can't seem to find a readily available rebuilt tranny, I think I'm going to go with your recommendation of an Acme 541 for now so I can get the boat on the water by the end of the week. I will look at the transmission swap for next season.

unless of course, someone pops up today with a 1.23:1 transmission for me, ready to go!

[AirTool]

RE: best prop

Here it is but you might need to change your mounts etc. too to get the correct drive angle.

http://www.skidim.com/prodinfo.asp?number=RA157017

type in ccfan for the promo and you might save 10%.

[TRBenj]

RE: best prop

Dont forget to reindex the pump in the tranny to switch it from the RH engine to the LH.

Airtool is correct- tranny mounts are different on the 1.23. I dont believe the engine mounts change, though..

Personally, Id do it right the first time (and get the 1.23) rather than spending $300+ on a prop you wont be able to use later and doing the whole job twice- but thats just me!

[GroovyNautique]

RE: best prop

ok, peer pressure works! my local nautique guy got me one at cost from pcm for $1300'ish, so I'm going to do it right the first time around and be done with it.

[AirTool]

Re: RE: best prop

Airtool is correct- tranny mounts are different on the 1.23. I dont believe the engine mounts change, though..

The 1.23 has the 9 degree change in shaft angle. I was thinking the 1.0 didn't have that and that the engine was angled to match prop the shaft angle.

[TRBenj]

Re: RE: best prop

Airtool is correct- tranny mounts are different on the 1.23. I dont believe the engine mounts change, though..

The 1.23 has the 9 degree change in shaft angle. I was thinking the 1.0 didn't have that and that the engine was angled to match prop the shaft angle.

Thats correct- the engine sits flatter with the 1.23. The engine height at the front is roughly the same (engine mounts dont change) but the tranny sits up a bit higher (hence the need for taller tranny mounts).