Go Back  Offshoreonly.com > Owners Forum > Baja
what rpm is ok? >

what rpm is ok?

Notices

what rpm is ok?

Thread Tools
 
Old 08-27-2010 | 01:10 PM
  #11  
Thread Starter
Registered
 
Joined: Jul 2010
Posts: 23
Likes: 0
Default

how do i figure my pitch so i know what im running?
delly is offline  
Reply
Old 08-27-2010 | 02:16 PM
  #12  
Dock Holiday's Avatar
Charter Member #34
 
Joined: Oct 2000
Posts: 7,151
Likes: 2
From: Beautiful North Carolina
Default

Originally Posted by delly
how do i figure my pitch so i know what im running?
My guess is a good prop to start with on your set up is a 23 pitch 3 blade. If you cannot get that prop to spin to around 5800 RPM then you have too much prop and need to back down to a 21 pitch. It is spins over 4800 RPM then you have an excess of power and will want to try a larger prop say a 25 pitch.

It is all trial and error based around matching the correct prop that puts your engine where it needs to be at WOT.
Dock Holiday is offline  
Reply
Old 08-28-2010 | 01:58 PM
  #13  
Registered
 
Joined: Nov 2006
Posts: 974
Likes: 4
From: Boca Raton, FL
Default

Originally Posted by Dock Holiday
My guess is a good prop to start with on your set up is a 23 pitch 3 blade. If you cannot get that prop to spin to around 5800 RPM then you have too much prop and need to back down to a 21 pitch. It is spins over 4800 RPM then you have an excess of power and will want to try a larger prop say a 25 pitch.

It is all trial and error based around matching the correct prop that puts your engine where it needs to be at WOT.
Dock, he's running a Bravo 3--dual props. He cant just throw on a 23 pitch 3 blade!! LOL!

If its the standard 7.4 litre 454 (not mag) then he should be running a max of 4800 RPM.
Powerquest_Baby!! is offline  
Reply
Old 08-30-2010 | 10:56 PM
  #14  
Thread Starter
Registered
 
Joined: Jul 2010
Posts: 23
Likes: 0
Default

ok on my props it say 24P So im assuming they are 24 pitch props
delly is offline  
Reply
Old 08-30-2010 | 11:11 PM
  #15  
Registered
 
Joined: Apr 2005
Posts: 2,957
Likes: 1
From: www.bajaboatowners.com
Default

that is correct..
Irishtornado is offline  
Reply
Old 08-30-2010 | 11:19 PM
  #16  
Registered
 
Joined: Apr 2005
Posts: 2,957
Likes: 1
From: www.bajaboatowners.com
Default

IMO you need to take that bravo 3 off there and put a bravo1 on there with 1.5 ratio. If you've already got a 1.5 ratio upper just buy a lower to put on it. Then put a 22p Bravo prop on it or a 23p Mirage Plus. I've got 2 bravo1 lower DWP on both
Irishtornado is offline  
Reply
Old 08-31-2010 | 11:34 PM
  #17  
Registered
 
Joined: Dec 2008
Posts: 729
Likes: 1
From: Detroit, MI/Lake Havasu, AZ
Default

On my carbed 272, the WOT range was 4200-4600 RPM. I could never get it to go over 4600.
SmurfOnABoat is offline  
Reply
Old 08-31-2010 | 11:35 PM
  #18  
Registered
 
Joined: Dec 2008
Posts: 729
Likes: 1
From: Detroit, MI/Lake Havasu, AZ
Default

Also, my 272 with a carbed 330hp 454 had a mirage 21 Pitch on it. Ran about 54/55mph @ WOT
SmurfOnABoat is offline  
Reply
Old 09-01-2010 | 03:37 PM
  #19  
AIR TIME's Avatar
Registered
20 Year Member
 
Joined: Dec 2000
Posts: 6,283
Likes: 1
From: EASTON MA.
Default

you need to check the tach cause to spin two 24p props to 6000rpm is nuts or you are over trimming the drive, a b1 drive will be better for you.
AIR TIME is offline  
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.