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  #1  
Old 09-02-2010
Frank Pristera Frank Pristera is offline
 
Join Date: Apr 2010
Posts: 7
Frank Pristera is probably out on their Luhrs boat.
Prop size help

I just purchused a 1991 350 Sportfisherman Convertible w/Twin Marine Power
454 SportPac engines. It's proped with 23x23 1/2 4 blade props. I'm turning 2800 rpms at WOT. I cannot read the transmission plates for the gear ratio,
there Borg Werner Velvet Drives. The previous original owner hasn't got a glue,he repropped in 2007. Is there anyone out there that has the same boat
that can help me.

Thank You

Frank "Cookie Monster"
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  #2  
Old 10-04-2010
Jus trollin Jus trollin is offline
 
Join Date: Oct 2009
Posts: 87
Jus trollin is probably out on their Luhrs boat.
prop size help

I have the same boat the trans ratio is 2:57:1 with 1 3/8 shafts H.P. is 310.
I am turning 4500rpm with 20X24 in. three blades with poor control backing into slip. I changed to 20X24in. 4 blades and lost 200 rpm but gained some control. Hope this helps
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  #3  
Old 12-14-2010
Esquire's Avatar
Esquire Esquire is offline
 
Join Date: Jul 2007
Location: Indiana, (just south of South Bend)
Posts: 210
Esquire will become famous soon enoughEsquire will become famous soon enough
It sounds like you are way overpropped. I have Crusader 8.2 (502) gas engines in my 36 and I cruise at @ 3400 to 3600 rpms, my wot is 4800 to 5000 rpms. A wot of 2800 rpms is more like a diesel than a gas 454... Call marine power and they should tell you your engines WOT rating, if I am right and it should be in the 4200 to 4600 range you need to get rid of those props, they will ruin your engines.
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  #4  
Old 01-21-2011
Choppy Choppy is offline
 
Join Date: May 2007
Posts: 3
Choppy is probably out on their Luhrs boat.
Props, Speed, Fuel Burn.....

Hi Gents,

I have a 1990 350 with Crusader 502's and although I can't seem to find my prop specs right now (I believe they are 18 x 19 and not sure of the cup), can you give me an idea of what your cruising speed and fuel consumption is at the 2800-3200 RPM range? I have always thought my boat should be faster (we cruise at 10-11 knots) but my mechanic has assurred me that we're OK..........thanks!

Aloha,
Choppy
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