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Cliffjumper

  • Karma: +8/-0
460 ford won't go past 3500
« on: July 22, 2017, 02:07:06 PM »
Fresh rebuild on a bbf 460.  new dist rebuilt carb. Revs up to 5800rpm out of water. But in water only gets up to 3600 I'm not a Ford guy but been scratching my head at this.  460 .40 over .flat tappet cam by cam research, hei distributor. 850 Holley with 74 main and 84 secondary jets

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2xcrash

  • Karma: +1/-0
Re: 460 ford won't go past 3500
« Reply #1 on: July 22, 2017, 09:27:32 PM »
Man, sounds like we're in the same boat.... pardon the pun. I just posted about my 460 being a dog too today.


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Cliffjumper

  • Karma: +8/-0
Re: 460 ford won't go past 3500
« Reply #2 on: July 22, 2017, 10:09:00 PM »
Quote from: 2xcrash on July 22, 2017, 09:27:32 PM
Man, sounds like we're in the same boat.... pardon the pun. I just posted about my 460 being a dog too today.


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This one might be a timing issue. I'm not a Ford guy but this engine has got me stumpped

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oldseddie

  • Karma: +0/-0
Re: 460 ford won't go past 3500
« Reply #3 on: July 25, 2017, 05:10:57 AM »
Quote from: Cliffjumper on July 22, 2017, 10:09:00 PM
This one might be a timing issue. I'm not a Ford guy but this engine has got me stumpped

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I have seen cam timing being off causing this.

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GT Jets

  • Karma: +192/-0
Re: 460 ford won't go past 3500
« Reply #4 on: July 25, 2017, 10:00:15 PM »
Sounds like coil breakdown.

Does it idle good?

GT
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

Six-Oh-Nine

  • Karma: +28/-0
Re: 460 ford won't go past 3500
« Reply #5 on: July 27, 2017, 03:59:14 AM »
Quote from: Cliffjumper on July 22, 2017, 02:07:06 PM
Fresh rebuild on a bbf 460.  new dist rebuilt carb. Revs up to 5800rpm out of water. But in water only gets up to 3600 I'm not a Ford guy but been scratching my head at this.  460 .40 over .flat tappet cam by cam research, hei distributor. 850 Holley with 74 main and 84 secondary jets

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Just curious, what did it turn before the rebuild? Any popping, missing, stumbling, etc... ??? Any signs of anything awry other than it won't turn rpm?


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The Bostick ®

Some people play hard to get, I play hard to want.

Six-Oh-Nine

  • Karma: +28/-0
Re: 460 ford won't go past 3500
« Reply #6 on: July 27, 2017, 04:01:47 AM »
Quote from: GT Jets on July 25, 2017, 10:00:15 PM
Sounds like coil breakdown.

Does it idle good?

GT

Been there... done that... banged head against wall, greyed a few hairs, and said lots of cuss words because of it

Only thing is typically if a coil is crapping out, usually it will miss... stumble... something other than just hit a wall.


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The Bostick ®

Some people play hard to get, I play hard to want.

el mojado

  • Karma: +15/-0
Re: 460 ford won't go past 3500
« Reply #7 on: July 27, 2017, 11:27:45 PM »
Mine did this once. Dirty fuel filter and carb. Cleaned both then good to go. Good luck.

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Cliffjumper

  • Karma: +8/-0
Re: 460 ford won't go past 3500
« Reply #8 on: July 31, 2017, 11:32:54 AM »
Quote from: GT Jets on July 25, 2017, 10:00:15 PM
Sounds like coil breakdown.

Does it idle good?

GT
Yes idles fine.

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Cliffjumper

  • Karma: +8/-0
Re: 460 ford won't go past 3500
« Reply #9 on: July 31, 2017, 11:38:01 AM »
It has a msd box box was sent to msd to refresh it.  New cap, rotor. Still did the same. Put a hei in it still did the same thing.  Carb was rebuilt and running 8 psi to the carb. 850 double pumper mech secondaries.  74 primary jets 84 secondary jets.  I'm sticking a new dizzy in it and gonna try.  It has a new fuel filter in it

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GT Jets

  • Karma: +192/-0
Re: 460 ford won't go past 3500
« Reply #10 on: July 31, 2017, 07:37:09 PM »
Quote from: Cliffjumper on July 31, 2017, 11:38:01 AM
It has a msd box box was sent to msd to refresh it.  New cap, rotor. Still did the same. Put a hei in it still did the same thing.  Carb was rebuilt and running 8 psi to the carb. 850 double pumper mech secondaries.  74 primary jets 84 secondary jets.  I'm sticking a new dizzy in it and gonna try.  It has a new fuel filter in it

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Why 8PSI?
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

Cliffjumper

  • Karma: +8/-0
Re: 460 ford won't go past 3500
« Reply #11 on: July 31, 2017, 10:51:19 PM »
Quote from: GT Jets on July 31, 2017, 07:37:09 PM

Why 8PSI?
I'm running a Mallory pro comp fuel pump pushes 14 psi. So I put a regulator on it. 10 psi floods the carb

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GT Jets

  • Karma: +192/-0
Re: 460 ford won't go past 3500
« Reply #12 on: July 31, 2017, 11:20:33 PM »
Quote from: Cliffjumper on July 31, 2017, 10:51:19 PM
I'm running a Mallory pro comp fuel pump pushes 14 psi. So I put a regulator on it. 10 psi floods the carb

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Shouldn't need more than 6....
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

Cliffjumper

  • Karma: +8/-0
Re: 460 ford won't go past 3500
« Reply #13 on: August 12, 2017, 12:57:27 PM »
Well I'll find out today

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