Re: 440 falls off at 5 grand...Stumped
[Re: stinger]
#1471760
07/22/13 05:11 PM
07/22/13 05:11 PM
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Joined: Jan 2003
Posts: 3,849 N.E. Ohio
6bblFLASH
master
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master
Joined: Jan 2003
Posts: 3,849
N.E. Ohio
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I would be very interested in a solution too. I have the same problem on my 440,but have tried almost everything listed and more,3-cams/gears/carbs/ignition-3-of them/exhaust/timing /springs/fuel-pumps/shim-rockers......whats left? Heads and a lighter car
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas 9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ! 2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: 440 falls off at 5 grand...Stumped
[Re: stinger]
#1471761
07/22/13 05:50 PM
07/22/13 05:50 PM
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Joined: Aug 2006
Posts: 2,564 God's Country Maryland
GODSCOUNTRY340
master
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master
Joined: Aug 2006
Posts: 2,564
God's Country Maryland
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Make sure the gas tank vent isn't plugged. Try it with the gas cap either loose or off to verify.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: 440 falls off at 5 grand...Stumped
[Re: stinger]
#1471764
07/22/13 09:09 PM
07/22/13 09:09 PM
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Joined: Sep 2005
Posts: 6,516 Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Lot's of good suggestions. I'd add making sure the throttle plates are fully open with the pedal at WOT. If that's OK, I'd substitute in a different coil. You didn't say "how" it falls flat. If it's draining the fuel line like in a plugged tank intake they usually just die and then when you back off they start back up in my experience. If the acceleration goes flat with a burble it's the rev limiter kicking in if it cuts individual cylinders. If the limiter is the type that kills all spark it want's to put you through the front window. Just some more ideas, hope you find it soon...
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Re: 440 falls off at 5 grand...Stumped
[Re: 6bblFLASH]
#1471765
07/22/13 10:08 PM
07/22/13 10:08 PM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
I would be very interested in a solution too. I have the same problem on my 440,but have tried almost everything listed and more,3-cams/gears/carbs/ignition-3-of them/exhaust/timing /springs/fuel-pumps/shim-rockers......whats left? Heads and a lighter car
your blower is too small......
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Re: 440 falls off at 5 grand...Stumped
[Re: Lefty]
#1471766
07/22/13 10:08 PM
07/22/13 10:08 PM
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Joined: Jul 2007
Posts: 464 Detroit Michigan
stinger
OP
mopar
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OP
mopar
Joined: Jul 2007
Posts: 464
Detroit Michigan
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Quote:
Lot's of good suggestions. I'd add making sure the throttle plates are fully open with the pedal at WOT. If that's OK, I'd substitute in a different coil.
You didn't say "how" it falls flat. If it's draining the fuel line like in a plugged tank intake they usually just die and then when you back off they start back up in my experience. If the acceleration goes flat with a burble it's the rev limiter kicking in if it cuts individual cylinders. If the limiter is the type that kills all spark it want's to put you through the front window.
Just some more ideas, hope you find it soon...
it sounds like it just starts breaking up with a fast loss of power,let off and its fine. runs great up to 5ooo fine after.idles perfect,starts easy all the time.great running engine other then the 5 grand limit. there is no rev limiter. the coil is old though,sound like it could be a coil? it's a blaster 2. I thought coils just took a dump and that's that.
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Re: 440 falls off at 5 grand...Stumped
[Re: Mr.Yuck]
#1471768
07/22/13 10:23 PM
07/22/13 10:23 PM
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Joined: Jul 2007
Posts: 464 Detroit Michigan
stinger
OP
mopar
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OP
mopar
Joined: Jul 2007
Posts: 464
Detroit Michigan
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Quote:
My blaster II is like 10-15 years old. It's been on 4 engines. does it Peter out in the burn out box at 5k? or is it down track?
street car so down track
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Re: 440 falls off at 5 grand...Stumped
[Re: Dodgem]
#1471770
07/22/13 11:52 PM
07/22/13 11:52 PM
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Joined: Jul 2007
Posts: 464 Detroit Michigan
stinger
OP
mopar
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OP
mopar
Joined: Jul 2007
Posts: 464
Detroit Michigan
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Quote:
If it sounds like it's breaking up fuel supply or valve springs!
my thoughts as well. I'll do the fuel test in a few days and post my findings. the spring kit for this cam is cheap and single spring so should be an easy swap if need be. Thanks All!
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Re: 440 falls off at 5 grand...Stumped
[Re: dennismopar73]
#1471772
07/23/13 06:12 AM
07/23/13 06:12 AM
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Joined: Jun 2008
Posts: 10,958 Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,958
Oakdale CT
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Quote:
It will be fuel delivery! either the pump not up to task, or the way the fuel is ran to the carb (s) Unless the springs have broken the stocker will go past 5500!
I went through this over well over a decade ago, two different sets of MP springs! All crap. Checked the pressures before and after a weeks run time and was horrified how much they dropped off.
Ended up buying a set of battleship steel springs and taking out the inner spring to get the pressure I wanted. Even after years of use still within spec and the motor has been buzzed hard to 7200 RPM.
Before that it would get to around 5000-5500 and pop and frat like it had a bad misfire from a coil of ignition box.
Check the springs, check the springs, check the springs. Really not that hard to pull two and have them checked.
Ignition wise I ended up using a gold NASCAR box, Blaster II coil, and Moroso spiral core 8mm wires all of which made no difference till I changed springs.
Hell I even indexed the distributor rotor with a clear ignition cap and timing light, still got the cap too.
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Re: 440 falls off at 5 grand...Stumped
[Re: gdonovan]
#1471776
07/23/13 11:13 AM
07/23/13 11:13 AM
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Joined: Jan 2003
Posts: 6,840 The Swamp
Sixpak
master
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master
Joined: Jan 2003
Posts: 6,840
The Swamp
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Quote:
Quote:
It will be fuel delivery! either the pump not up to task, or the way the fuel is ran to the carb (s) Unless the springs have broken the stocker will go past 5500!
I went through this over well over a decade ago, two different sets of MP springs! All crap. Checked the pressures before and after a weeks run time and was horrified how much they dropped off.
Ended up buying a set of battleship steel springs and taking out the inner spring to get the pressure I wanted. Even after years of use still within spec and the motor has been buzzed hard to 7200 RPM.
Before that it would get to around 5000-5500 and pop and frat like it had a bad misfire from a coil of ignition box.
Check the springs, check the springs, check the springs. Really not that hard to pull two and have them checked.
Ignition wise I ended up using a gold NASCAR box, Blaster II coil, and Moroso spiral core 8mm wires all of which made no difference till I changed springs.
Hell I even indexed the distributor rotor with a clear ignition cap and timing light, still got the cap too.
MP springs are junk - you learned the hard way.
Not sure what rockers are on the motor but I had a small block that would break up at 4500. Was running stock non adjustable rockers. Heads and blocked were milled. Hydraulic lifters would pump up at 4500 and cause valve float. Adjustable rockers cured it. I'd start with the valve train - adjustable rockers/valve lash, valve springs, and look at fuel delivery too.
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Re: 440 falls off at 5 grand...Stumped
[Re: Sixpak]
#1471777
07/23/13 01:11 PM
07/23/13 01:11 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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My : Valve springs. R.
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