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Re: what's wrong...
[Re: Mr.Yuck]
#1211824
04/08/12 12:04 AM
04/08/12 12:04 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
vern it roll at least 5-10' after clearing. They don't give us much room that's for sure. Usually I just take it up to about 3k hold or a second and move forward...seemd like it wanted to stall so I gunned it more than usual.
Still have the factory amp gauge hooked up, looks good.
Voltage at your amp gauge doesnt mean anything...
check it at the pump and also at the ignition...
is that old fuel in your tank... it sounds like its
old fuel or it has water in it... could just be the
ignition
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Re: what's wrong...
[Re: rook440]
#1211827
04/08/12 03:10 AM
04/08/12 03:10 AM
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Joined: Jul 2011
Posts: 781
wine country
8urvette
super stock
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super stock
Joined: Jul 2011
Posts: 781
wine country
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Quote:
Check your grounds too to make sure they are clean and now corosion ,,,a good ground is very important and is often over looked ...
I had a buddy with a low 12 sec nova, ran great, all of sudden about 5000 rpms it would start to cut out.
he changed alternators, distributors, fuel pumps, battery, plugs, wires... he was about ready to give up when we discovered the grounds were solid and tight, but had built up corrosion between them and the chassis. we couldn't see it by looking at them, but just on a whim we pulled one and discovered this.
cleaned them all, and added a few more  and problem was gone.
Last edited by 8urvette; 04/08/12 03:12 AM.
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Re: what's wrong...
[Re: A57_RT ]
#1211831
04/08/12 09:47 AM
04/08/12 09:47 AM
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Joined: Sep 2003
Posts: 1,113
Lost in Pooler, GA
Gumbydammit
super stock
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super stock
Joined: Sep 2003
Posts: 1,113
Lost in Pooler, GA
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The Valve springs were not new when you bought the motor from me. I re ringed it, new bearings, put a 'street' roller cam in it, New timing chain, etc. and such just like we discussed. basically, A freshened bracket motor with a new cam.
I'd test the valve spring pressure just to be sure. It's been so long, I don't remember if they were new with the previous roller cam or not. With a Solid roller cam, and street driving, it's a good idea to check the springs once in a while anyway.
I wouldn't get carried away with worrying about the open or closed pressures when using an on-head tester, but rather seeing if there are big differences between the springs, and if one seems to get weaker faster than the others.
Anyway, that being said, I'd take the advice of others too, fuel pressure, and maybe try a pass on a mix of race gas and not Meth inj.
I'm Gumby dammit!
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Re: what's wrong...
[Re: Gumbydammit]
#1211833
04/08/12 10:44 AM
04/08/12 10:44 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Thanks guys, Sorry Gumby thought they were newer.. I'll hit the other items real quick and see how it goes, Chirs K. I went better the last pass because i stayed in it the 2nd pass I let out of it as soon as I hit 3rd. and don't hate on my green helmet...hahaha. It didn't seem to run bad at all at the end of the track, plugs looked good too..maybe a tad lean. I'll give it a once over and get the MSD in. What's the best way to test the springs? I also fiund another problem as I went to get a beer last night, seems the Drivers side axle seal has quit...that will be 1st on the list. and the traction bars are gone, went from 1.60 to 1.68 even a 1.86 sixty foot (last pass) Chris D.. yes I have the winshield washer injection, I thought that was it too, I cut it off on the 2nd pass when t started breaking up and it kept on doing it. BTBel..I checked them at the track, but I'll do a re-look here, nice and cool now. Anyway had fun, at least nothing broke. And I had 3 people tell me I had the coolest car at the track.. I said don't look to colse you might change your mond. 
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Re: what's wrong...
[Re: challengermike]
#1211836
04/08/12 11:34 AM
04/08/12 11:34 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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I'll start cheapest to most expensive...lol
fuel pressure up, clean all the grounds, check wires, check cap-rotor, Install the MSD go for a blast. If it still falls apart, I'll check the springs.
The gas SHOULD be good. I added stablizer last year, and have driven it a lot over the winter. It had 10 gallons of new 93 in it...Unless that gas was older (sitting in the ground for a while).
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Re: what's wrong...
[Re: Mr.Yuck]
#1211838
04/08/12 11:58 AM
04/08/12 11:58 AM
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Joined: Jan 2003
Posts: 9,989
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,989
Frostbitefalls MN (Rocky&Bullw...
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Quote:
I'll start cheapest to most expensive...lol
fuel pressure up, clean all the grounds, check wires, check cap-rotor, Install the MSD go for a blast. If it still falls apart, I'll check the springs.
The gas SHOULD be good. I added stablizer last year, and have driven it a lot over the winter. It had 10 gallons of new 93 in it...Unless that gas was older (sitting in the ground for a while).
On the ignition, hard wire it on its' own circuit with all new wire. Solder all connections. Use a separate on off switch. Why? There are gremlins in those old Mopar wiring circuits that can cause problems when a load is placed on them. Sounds to me like resistance in the power circuit to the ignition went up as it got warmer during the run. Or, SOMETHING in the ignition went south as it got heated during the run. Fuel pressure need never be over 7.5 PSI on holley fuel bowls running gas. I have had Tunnelrams show no problems at only 3 psi because that is all it took to pump enough gas through four float bowls to make 650 hp (and keep the bowls reasonably full)on gas. The instant I went to a single dominator, the two bowls needed the extra pressure to keep up. Then 7 psi was needed, and sufficient.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: what's wrong...
[Re: gregsdart]
#1211839
04/08/12 12:14 PM
04/08/12 12:14 PM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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What size are your fuel lines? You need volume as well as pressure.Also what size is your fuel pressure line going to the gauge? A few years back I had the same problem and like you had plenty of pressure 7lbs all the way down the track with a 1/8" plastic line to the fuel pressure gauge,changed it to a 3/8" line and had only about a 1 1/2 of pressure go through the lights. You also might want to check the size of your needle and seats,the standard size don't cut it for a Big block Mopar.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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Re: what's wrong...
[Re: Crizila]
#1211843
04/08/12 01:12 PM
04/08/12 01:12 PM
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Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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Quote:
Quote:
sounds like fuel starvation to me. Nothing in first gear then all through the second half of the track. What kind of fuel pump?
Yep. Fuel issue. Just because you have good pressure doesn't necessarily mean the motor isn't starving for fuel at the big end. Ignition, valve springs,etc, would most likely show up in every gear.
I thought so too.......I sent the box to Tx. ( MSD 7 AL )and it checked good.
Swapped chips for r.p.m. with ones that I knew worked.
I was pulling plugs and showing them to guys I trusted , checked connections , set and re-set floats and regulators , did the volume test etc.
But when the motor was pulling hard in 2nd and 3rd , it sounded just like it was on the chip.
It was a valve spring.
1st revved out just fine , so it didn't make sense to me either , but that cured it.
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