prop trouble

[senior chief]

just purchased a trophy 2052 21.7ft 4.3 mercruser the dealer installed a ss prop 14.25-15 rpm maxes out at 5000 and safety device slows engine down to prevent over reving,bought boat in miss i live in nc.called dealer he said the stock alum prop does the same thing maxes out 5000 rpm stock prop is 15-17 can anyone help.mph with ss prop around 38-39 mph

 

[Bondo]

Re: prop trouble

You're Going the Wrong Way..... Go to a 19", or even a 21"..... The Only way to know for Sure, Is to Try one,+ See where your RPMs fall too...... You Should be turning around 4600rpms, at WOT....<br />Is this your Dealer's First Sale ???? He SHOULD Know Better......

 

[senior chief]

Re: prop trouble

thanks bondo i thought 19 or 21 but wasnt sure the dealer isnt much help ill call him tomorrow and inlighten his life.should i stay with 14.24 or go to 15 ss.

 

[karayj]

Re: prop trouble

you can find new props real cheep on ebay i bought several great prices

 

[Boatist]

Re: prop trouble

Senior Chief<br />Want to ask one question first. Is boat loaded with the normal gear you will carry or running very lite. I belive your WOT RPM's should be 4400-4800. Assuming boat has the gear in it you will normally carry then I would go with a 19 pitch stainless steel. This will reduce your rpm about 400 rpms to 4600. This is also assuming that 5000 was at full throttle. I mean if it hit the rev limiter at 3/4 throttle then you even need more pitch, a 21 inch. You can expect about 200 rpm change per inch of pitch change. I would tell dealer you want to exchange for the higher pitch prop. Stainless steel will usually give you about 2 to 3 mph increase over aluminum.