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Doral
 BoatUS Boat Groups/Manufacturer Forums>>Doral
Subject Topic: monticello rpm Post ReplyPost New Topic
 
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lexman
"Seaman Recruit"




Joined: July 22 2010
Posts: 12
Posted: July 22 2010 at 22:44 | IP Logged Quote lexman

Help - I'm looking at a 2006 monticello with a 5.7 Volvo - RPM's are reading 4200 with 43MPH- spec says 4800-5200. Is the rpm gauge off??? Thanks for any help.

Lexman

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bannister
"Seaman Recruit"




Joined: December 05 2009
Posts: 24
Posted: August 17 2010 at 03:56 | IP Logged Quote bannister

gauges might be a little bit off but not that much.
looks to me that you need a prop with smaller pitch to reach 4800 rpm.
you will loose some top speed (2-3 knots) but you will get on plane faster and fuel consumption will go down.

had the same problem with 22 pitch props and Merc. 5.7 EFI, running 40 mph at 4000 rpm but the boat had a hard time getting on plane without trim tabs. cruising speed at 3500 rpm was 28 mph burning 48lt per hour.

changed with 20 pitch (same boat weight and gear) and the boat gets on plane right away without trim tabs, going up to 4500 rpm at 39 mph. cruising speed at 3500 rpm is now 25 mph burning 43lt per hour.


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lexman
"Seaman Recruit"




Joined: July 22 2010
Posts: 12
Posted: August 17 2010 at 21:22 | IP Logged Quote lexman

Thanks Bannister- my props now are F4's - not sure if I want to go all the way to 20's or the 22's- would hate to buy a set and find out I need the other size.

Lexman

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bannister
"Seaman Recruit"




Joined: December 05 2009
Posts: 24
Posted: August 18 2010 at 05:48 | IP Logged Quote bannister

Go to your local Volvo Penta dealer and ask him for test props. He will give 2-3 sets to try and you will buy the one that suits you best.
Their tech department will help you with the right pitch according to your horse power, length and weight.
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