440 falls off at 5 grand...Stumped
#1471740
07/21/13 10:16 PM
07/21/13 10:16 PM
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Joined: Jul 2007
Posts: 462 Detroit Michigan
stinger
OP
mopar
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OP
mopar
Joined: Jul 2007
Posts: 462
Detroit Michigan
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I have a 440 in a e bod,lunati 303 cam,worked 452 heads,391 rear auto. has 3/8 sender,fuel line,eddy mech. pump,eddy rpm intake,850 holly dbl. pumper msd 6a ign.,headers,2 1/2" exhaust. runs like a champ and falls apart just a tic past 5 grand. I've tried jetting,timing,fuel pumps,no air cleaner,gas cap,2 different dizzy's all with the exact same results. I would think it should pull past 5 grand but cant figure what's hanging it up. seems to be fuel but plugs are a nice tan color. Any idea's??? I'm stumped.
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Re: 440 falls off at 5 grand...Stumped
[Re: stinger]
#1471741
07/21/13 10:23 PM
07/21/13 10:23 PM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Re: 440 falls off at 5 grand...Stumped
[Re: DAYCLONA]
#1471743
07/21/13 10:27 PM
07/21/13 10:27 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
Not knowing whether you've performed the mods to the car, or purchased it that way?....but any chance the MSD may have a 5000 RPM rev chip limiter?
Oh yea try different chips if it as a limiter.
The other thing that can cause that is too much preload on the lifters and it pumping open. you can try taking a 1/2 turn at a time out of adjusters to see what it does don't be afraid of a little ticking!
Are the heads milled and or block decked much?
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Re: 440 falls off at 5 grand...Stumped
[Re: Dodgem]
#1471745
07/21/13 10:36 PM
07/21/13 10:36 PM
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Joined: Jul 2007
Posts: 462 Detroit Michigan
stinger
OP
mopar
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OP
mopar
Joined: Jul 2007
Posts: 462
Detroit Michigan
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heads been cc'd to 85 so a little cut,can see the numbers shaved a little bit. no rev limiter. didn't think of backing out and hitting it again but will try. just running stock rockers for now. I did not build the engine so not much help there.
maybe a set of rocker shaft shims???
Last edited by stinger; 07/21/13 10:40 PM.
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Re: 440 falls off at 5 grand...Stumped
[Re: stinger]
#1471746
07/21/13 11:10 PM
07/21/13 11:10 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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As you know I'd want to pin it to fuel or ign first. Sounds like you have a killer fuel delivery system but I'd T at the carb inlet & run a neoprene line to a vac gauge with a psi side & tape it to the windshield & need several psi at the offending rpm/load. since you've been dealing with this for awhile I'd go ahead & go to the trouble of subbing in a regular electronic ign & see what happens. Is rotor phasing close enough? NAPA has an Echlin rotor with a .060" longer blade that doesn't fix phasing but helps it as it reduces the distance the spark has to jump. MO-3000 for $8 dollars & change out the door. As said check preload. I'm gonna WAG that it is the Might Sputter & Die system. Holler how it goes.
live every 24 hour block of time like it's your last day on earth
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Re: 440 falls off at 5 grand...Stumped
[Re: strokerchall]
#1471748
07/21/13 11:58 PM
07/21/13 11:58 PM
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Joined: Jul 2007
Posts: 462 Detroit Michigan
stinger
OP
mopar
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OP
mopar
Joined: Jul 2007
Posts: 462
Detroit Michigan
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Quote:
do you have a carb spacer? maybe the fuel is boiling?
no and doudt it. don't think its pre load or pump up.engine runs great until the 5 grand mark and after it falls flat.
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Re: 440 falls off at 5 grand...Stumped
[Re: Dodgem]
#1471749
07/22/13 12:21 AM
07/22/13 12:21 AM
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Joined: Jan 2003
Posts: 28,399 Posting from 1893 in NW FL
TheBlueBeast
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 28,399
Posting from 1893 in NW FL
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Quote:
May be running out of fuel. run it up to 4800 let off completely then back to the boards if it then pulls up to say 5500 then you know your fuel is not keeping up!
I had a 383 that did this. the pump push rod was worn and when i replaced it the problem vanished.
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Re: 440 falls off at 5 grand...Stumped
[Re: stinger]
#1471752
07/22/13 03:22 AM
07/22/13 03:22 AM
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Joined: Jan 2003
Posts: 5,445 So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,445
So Cal
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Obviously you have hydraulic lifters.. If original Mopar OE stockers 5K or a little over is all you will get... Just my $0.02...
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Re: 440 falls off at 5 grand...Stumped
[Re: Mr.Yuck]
#1471758
07/22/13 09:34 AM
07/22/13 09:34 AM
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Joined: Mar 2005
Posts: 1,630 North Central Florida
eightlitermopar
top fuel
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top fuel
Joined: Mar 2005
Posts: 1,630
North Central Florida
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We had a 383 falling flat like that. It was the fuel pump pushrod. I second or third this opinion. Just looking at the rod you can't tell much of a difference. I'd change that and see what happens.....
Mopar or no car
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Re: 440 falls off at 5 grand...Stumped
[Re: eightlitermopar]
#1471759
07/22/13 10:23 AM
07/22/13 10:23 AM
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Joined: Jun 2008
Posts: 10,847 Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
We had a 383 falling flat like that. It was the fuel pump pushrod. I second or third this opinion. Just looking at the rod you can't tell much of a difference.
I'd change that and see what happens.....
p
Hook up a gauge and road test, does not sound like fuel to me though. Light throttle in to 5000 and then roll into it. Should have enough fuel in the bowls for a second or two.
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