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-   -   Prop Question ? (http://www.mariahownersclub.com/forum/prop-talk/2828-prop-question.html)

karmann 06-26-2009 01:27 PM
Prop Question ?
 
Hello All.

Can someone tell me the recomended prop for a 95 272 barchetta 454 W/ 385 Hp? It has a 15 1/4" x 21 pitch ss , on now, and seems to work fine.
When I look up a prop listing, it keps comming up with a 14 1/4"?

I want to buy a spare, But I'm not sure what size to get.
Can anyone tell me the manufacturer's recomended size?
W/O trimming up, and a lot of old gas, I was getting 44 mph, and 4000 rpm max.
thanks for any info.

WetWilly 06-28-2009 12:22 AM
Re: Prop Question ?
 
Hi karmann,

It does sound like you're a bit over propped at 4000 rpm max, but before you go out and buy a new on, you should do the WOT test properly (bad gas and improper trim can make a huge difference).

I read somewhere (still trying to locate it), the WOT RPM test should be performed with two people aboard, no additional gear and a 1/4 tank.

So empty (pump) out the "old" gas and refill 1/4 tank with fresh gas, get a passenger and go out on the water. When you get up on plane, trim out the boat for best speed and read the max RPM. Once you have the correct WOT RPM, you can determine if you need a different prop.

So go ahead and do the test and get back to us, OK?

WetWilly

karmann 06-29-2009 01:35 PM
Re: Prop Question ?
 
Hello Willie

What should the RPM's be at max?
Do you know what prop would have came on this boat from the factory?
thanks

Z 202 06-29-2009 02:52 PM
Re: Prop Question ?
 
4400-4800 is the standard WOT range for that motor.

What kind of drive do you have? I suspect a Bravo, but which one?

karmann 06-29-2009 07:17 PM
Re: Prop Question ?
 
Bravo One. 454 385 hp 27' boat

What size came on it from the factory?
thanks

z275st 06-29-2009 08:25 PM
Re: Prop Question ?
 
karmann,
I have a 27' with a 496 HO 425hp bravo1.
A few more horses, but not a huge difference. I run a Rev-4 21" for water sports and a heavy load, and a Mirage+ 23" for long distance cruising/top-speed.
I strongly agree with WetWilly on the retest prior to buying. I would think you should be getting better RPM's with your setup. There may be some other issues involved.
Just because a dealer sales a boat and prop together doesn't mean it is the best combination!

karmann 06-30-2009 03:13 PM
Re: Prop Question ?
 
Hello
What is the dia. of the rev 4?
thanks

z275st 06-30-2009 11:16 PM
Re: Prop Question ?
 
It is 14 5/8" dia.

Quote:
Originally Posted by karmann (Post 15934)
Hello
What is the dia. of the rev 4?
thanks

flood 07-01-2009 09:20 PM
Re: Prop Question ?
 
I also wanted to purchase a spare prop for my 2006 SX21. I sent an email directly to the Mariah website and they put me in touch with one of their tech guys. He provided me withrecommendations on the prop and pitch. Just a thought you might want to try.l


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