Go Back  Offshoreonly.com > General Discussion > General Boating Discussion
What to set the rev limiter to on an hp500 carb'd? >

What to set the rev limiter to on an hp500 carb'd?

Notices

What to set the rev limiter to on an hp500 carb'd?

Old 01-03-2010, 02:25 PM
  #1  
Registered
Platinum Member
Thread Starter
 
86Rette's Avatar
 
Join Date: Nov 2005
Location: Holland, MI
Posts: 32
Likes: 0
Received 0 Likes on 0 Posts
Default What to set the rev limiter to on an hp500 carb'd?

Just bought an msd 6 system for my hp500 carb'd. I know the stock merc rev limiter is set for either 5450 or 5350 but I have heard of people bumping it up. Also has anybody messed with tuning the msd with a laptop?

oops, I'm using my dad's laptop and just realized I'm logged in to his account. this is disturbedvelo22

Last edited by 86Rette; 01-03-2010 at 02:27 PM. Reason: clarification
86Rette is offline  
Old 01-03-2010, 04:26 PM
  #2  
Platinum Member
Platinum Member
 
Sea-Dated's Avatar
 
Join Date: Jun 2005
Location: Tulsa, Oklahoma / GLOC
Posts: 3,376
Received 0 Likes on 0 Posts
Default

I thought stock 500's had a 5200 redline....
Sea-Dated is offline  
Old 01-03-2010, 04:52 PM
  #3  
Registered
 
blue thunder's Avatar
 
Join Date: Nov 2001
Location: Pennsylvania
Posts: 3,385
Likes: 0
Received 0 Likes on 0 Posts
Default

It would depend on if the valve springs were stock hp500 and how many hours on them. If the springs were decent aftermarket with low hours and set up right, 5500rpm would be my number. That engine can make power up close to that level with an upgraded valvetrain. Stock, used springs, 5000rpm would be safe.
blue thunder is offline  
Old 01-03-2010, 05:08 PM
  #4  
Registered
 
Join Date: Jan 2004
Location: Jacksonville FL
Posts: 1,847
Received 6 Likes on 4 Posts
Default

i believe the limiter is at 5250. I had a carbed 500HP i took the rev limiter off and would Run 5600rpm's all day long on, the thing was the best motor ive ever owned, bullet proof
Boomer35 is offline  
Old 01-03-2010, 06:52 PM
  #5  
Charter Member
Charter Member
 
Thunderstruck's Avatar
 
Join Date: Nov 2000
Location: Lake Charles, LA USA
Posts: 1,094
Likes: 0
Received 0 Likes on 0 Posts
Default

I've run mine up to 5600 rpm for 5 years with no issues.
__________________
Long time cult member.
Thunderstruck is offline  
Old 01-03-2010, 07:06 PM
  #6  
Registered
 
Join Date: Mar 2009
Posts: 203
Likes: 0
Received 0 Likes on 0 Posts
Default

the springs have 50 hours on them and they are springs recommended as stock replacements. I'm pretty sure (at least its what the rpm gauge is reading) the motor is buzzing 5450 with the stock ignition. Did you guys set the distributer up like the stock?
DisturbedVelo22 is offline  
Old 01-03-2010, 07:24 PM
  #7  
Charter Member
Charter Member
 
Thunderstruck's Avatar
 
Join Date: Nov 2000
Location: Lake Charles, LA USA
Posts: 1,094
Likes: 0
Received 0 Likes on 0 Posts
Default

BTW my motors floated the valves with the stock lifters/valve springs at 57-5800. Probably need to stay below that.
__________________
Long time cult member.
Thunderstruck is offline  
Old 01-03-2010, 07:55 PM
  #8  
Are we having fun, yet?
Charter Member
 
Gizmo's Avatar
 
Join Date: Mar 2001
Location: Chesterfield, Va.
Posts: 782
Likes: 0
Received 0 Likes on 0 Posts
Default

Thunderstruck, What props are you running?
__________________
Jay
Gizmo is offline  
Old 01-03-2010, 10:55 PM
  #9  
Registered
 
Join Date: Mar 2009
Posts: 203
Likes: 0
Received 0 Likes on 0 Posts
Default

So stock replacement valve springs i should be all good at 5600?
DisturbedVelo22 is offline  
Old 01-04-2010, 02:22 AM
  #10  
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha/LOTO
Posts: 19,518
Received 1,784 Likes on 885 Posts
Default

Recommended WOT RPM of the 500HP is 4800-5200rpms. The rev limiters are supposed to be at 5350rpm, but vary somewhat and also tachs can be off. If you have TB IV ignition, the rev limiter is a separate part and can't be changed. If its a TB V, then I think you can have the limiter in the ECM changed.
Griff is offline  

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

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.