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VTJC
09-23-2004, 12:54 PM
I have a 99 MC CB Sport Star(95-97 Prostar and X-5 Hull) that I got used. Some how I ended up with a Maristar Manual. I am curious what is the max recommended running RPM for this engine? I have a 350 TBI with 1:1 transmission. I am also trying to confirm the shaft size, is it 1 inch?

Trying to pick out a new prop if you cannot tell! I current have a 13x13 OJ three blade. I am looking at the new CNC props, but unsure of the advantage of 3 or 4 blades for a boat that is uses almost exclusively for skiing.

Thanks in advance,

Jamie

BrianM
09-23-2004, 02:06 PM
Don't know what the RPM range is but if you go to Acmes web site and e-mail them the specs on your boat and what you want out of a prop. They will give you the reccomended prop. They got back to me in just a couple of hours.

east tx skier
09-23-2004, 03:15 PM
VTJC, I don't think the 350 TBI goes much past 4600 rpms if memory serves.

The choice of prop is as much about what your primary use for the boat is more than anything. There are a number of threads on this board and the old one about CNC'd props, specifically Acme props (although I'm sure OJ's are just as good). On a 1:1 direct drive boat, for slalom skiing Acme generally recommends the 3 blade unless the person insists that they want a 4 blade. I went with a 13x12 3 blade for my 93 Prostar (1:1) with a 351 HO and have proclaimed just on the good side of way too much that it is some of the best money I've spent on the boat. Call Bill Weeks or one of Acme's other folks. They are great to talk to, and will get you fixed up nicely. You can buy them for less from www.schnitzskis.com.

JimN
09-23-2004, 03:28 PM
The rev limiter will cut in as it gets closer to 5000 RPM. You'll definitely know when it starts. 4750 seems to be the number I remember- I didn't see the actual limit in my manual for 5.7L TBI.

1:1 has 1" shaft, 1.52:1 gets 1.25" shaft.

If the manual is for a Maristar with TBI, you're OK as far as the motor is concerned.

east tx skier
09-23-2004, 04:29 PM
Jim, I thought the gear reduction tranny had a 1 1/8" shaft? VTJC, you might check www.indmar.com. They have engine manuals available for download.

JimN
09-23-2004, 07:30 PM
I think you're right about 1-1/8". I never said I was infallible. Thanks for pointing this out.

VTJC
09-24-2004, 01:02 AM
Thanks for the advice. The Indamar manual from their website lists 4400-4800 as the operating range WOT, for carb and TBI 350s. The MPI, 8.1 MPI and Corvette engines are higher. The folks from ACME wanted to know the WOT limit to assist with selecting the prop. You all had recommended I contacted them in my previous prop inquiry post.

What are the different behaviors between three and four blade props?

Jamie

jimmer2880
09-24-2004, 07:42 AM
on non-cnc'd props... 4 blades usually gave a better hole-shot & stronger pull through the course. The price was top-end speed & more turbulence behind the boat. They also gave a softer wake I heard. I have a 4-blade OJ (non-CNC) on my 95 TBI 190 & it works well.

But - if I were to buy a new prop today, it would be a 3-blade CNC. Acme advertises that there isn't any difference between 3 & 4 blade CNC'd props.

VTJC
09-24-2004, 10:31 AM
I confirmed this morning my rev limiter kicks in at 4800rpm. Jimmer thanks for the info on the 3 vs 4 blade.

Jamie

VTJC
09-24-2004, 11:19 AM
Jim from Acme recommended an Acme #541, 13 x 12, 3-blade. This is pretty much an equivalent replacement for your 13 x 13 OJ, 3-blade, as far as sizing goes. But the Acme 541 has a lot more blade area than your current 3-blade. And it is fully CNCd. And it will offer much smoother and better performance throughout the range. In this application our 3-blade will offer everything that our four blade will, plus about 1-2 mph more speed on the top end.

Jamie

east tx skier
09-24-2004, 11:59 AM
I've got the 541, too. Schnitz was selling them earlier this year for $293 delivered.

east tx skier
09-24-2004, 03:16 PM
I think you're right about 1-1/8". I never said I was infallible. Thanks for pointing this out.

I thought I did it nicely, and in jeopardy fashion (in the form of a question).

Certainly wasn't like this delightful little dude :rant:

VTJC
09-25-2004, 11:31 AM
Going to try this four blade OJ XMP 12.5" x 12" http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2489862497&rd=1&sspagename=STRK%3AMEWN%3AIT Thanks for all your advice! Jamie

east tx skier
09-25-2004, 05:45 PM
Good luck with it. Let us know how it works for you.