Like Tree0Likes

Fuel / HP curve for 454 mag

Reply
Old 03-09-2004, 06:42 PM
  #1
JC Performance Engines
Gold Member
Thread Starter
 
Stormrider's Avatar
 
Join Date: Jul 2002
Location: Long Island, NY
My Boats: 2003 28 Pantera - SOLD
Posts: 8,811
Default Fuel / HP curve for 454 mag

Does anyone have the graph for HP/ fuel usage
for a 1988-89 454 mag 365hp?
Stormrider is offline  
Reply With Quote
Old 03-10-2004, 12:26 PM
  #2
JC Performance Engines
Gold Member
Thread Starter
 
Stormrider's Avatar
 
Join Date: Jul 2002
Location: Long Island, NY
My Boats: 2003 28 Pantera - SOLD
Posts: 8,811
Default

No one has this?
Or does anyone know the fuel burn rate at certain RPMs?

rob
Stormrider is offline  
Reply With Quote
Old 03-10-2004, 12:38 PM
  #3
Registered
 
mikev's Avatar
 
Join Date: Sep 2001
Location: Cumming, GA.
My Boats: 1988 Donzi Regazza
Posts: 254
Default

fuel burn rate would vary depending on the boat it was in. a heavier boat will require more throttle to maintain the same rpms vs. a lighter boat. same reason you get worse gas mileage towing your boat vs. driving your truck unloaded.
mikev is offline  
Reply With Quote
Old 03-10-2004, 01:09 PM
  #4
JC Performance Engines
Gold Member
Thread Starter
 
Stormrider's Avatar
 
Join Date: Jul 2002
Location: Long Island, NY
My Boats: 2003 28 Pantera - SOLD
Posts: 8,811
Default

Are you sure that's right?

If an engine is turning 3000rpm it needs so much fuel to turn. Why would it need more fuel to turn the same RPM.
I understand you need more rpm to run a greater speed in a heavier boat.
But shouldn't rpm be rpm under any load?
Isn't the fuel metered to a specific amount per cylinder per crank turn?
Stormrider is offline  
Reply With Quote
Old 03-10-2004, 01:13 PM
  #5
Registered
 
mikev's Avatar
 
Join Date: Sep 2001
Location: Cumming, GA.
My Boats: 1988 Donzi Regazza
Posts: 254
Default

nope your truck runs the same rpm at 70 with a load or not but you get different mileage pulling a load vs. running empty
mikev is offline  
Reply With Quote
Old 03-10-2004, 01:15 PM
  #6
Charter Member #927
Charter Member
 
Payton's Avatar
 
Join Date: Jan 2001
Location: IN
My Boats: 1991 34' Super Hawaii
Posts: 4,817
Default

an engne under load will burn a lot more fuel than an engine running under a light load at the same rpm. So the fuel curve will vary from one application to another.
Payton is offline  
Reply With Quote
Old 03-10-2004, 01:29 PM
  #7
Registered
Platinum Member
 
Join Date: Jan 2001
Location: PA and MD
My Boats: fuel injection, superchargers
Posts: 1,449
Default

All you can say is that at WOT you will burn between 35-40 GPH per motor.
cobra marty is offline  
Reply With Quote
Old 03-10-2004, 01:38 PM
  #8
JC Performance Engines
Gold Member
Thread Starter
 
Stormrider's Avatar
 
Join Date: Jul 2002
Location: Long Island, NY
My Boats: 2003 28 Pantera - SOLD
Posts: 8,811
Default

Thanks guys, that is the info I was looking for.
I'll be installing a fuel flow meter that has a 35gph max.

If WOT is 40gph, than I'll be under 35gph more than 95% of the time. Which means the damn thing should be pretty accurate. As opposed to cruising at 3200-3400rpm burning 40gph.

This is what I just got from Merc.
1600rpm 3.6gph
2500rpm 7.3gph
3500rpm 13.4gph
4500rpm 24.3gph

that is as high as they go.
Stormrider is offline  
Reply With Quote
Old 03-10-2004, 04:12 PM
  #9
Registered
 
ragtop409's Avatar
 
Join Date: Jul 2002
Location: Maximo FLA
My Boats: 1995 Nova Spyder
Posts: 1,322
Default

Also depends on the size of prop you turn and the load it creates. I get better milage and mor RPM's with my 23 pitch but the GPS says the 25 pitch is faster at a lower RPM's and uses more gas. go figure Rag's
ragtop409 is offline  
Reply With Quote
Old 03-10-2004, 04:35 PM
  #10
Platinum Member
Platinum Member
 
CAP071's Avatar
 
Join Date: Jul 2001
Location: USA
Posts: 16,430
Default

Just plan on spending lots of $$$ on gas this summer anyway
CAP071 is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
blownboat
Swap Shop
7
10-17-2008 02:48 AM
jhoward
General Q & A
7
07-09-2007 07:00 PM
Donzi502
General Q & A
2
09-30-2006 11:58 PM
Phazar454Mag
General Q & A
3
09-12-2005 08:58 AM
Stormrider
General Q & A
0
03-09-2004 04:54 PM



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



All times are GMT -5. The time now is 01:56 PM.


Copyright 2011 OffShoreOnly. All rights reserved.