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Re: what's wrong...
[Re: Leigh]
#1211845
04/08/12 02:10 PM
04/08/12 02:10 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Could the carb(s) be jetted too lean for the cooler air conditions, you said the plugs look a tad lean, and I am sure it's after you drove back to the pits.  just trying to help
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: what's wrong...
[Re: VernMotor]
#1211846
04/08/12 02:18 PM
04/08/12 02:18 PM
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Joined: Jan 2003
Posts: 4,852
KENTUCKY
69CHARGERMD
master
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master
Joined: Jan 2003
Posts: 4,852
KENTUCKY
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Quote:
Well now with what you know about or do not know about the valve springs. you should get some new ones on it..if it fixs it or not.. That be the first thing I would do.
Im with Vern. I would replace them first. Hate to float a valve or have a valvetrain problem, especially if they havent been checked. ( Vern is pretty sharp with tuning, and his daughter is deadly on the track, howdy Vern )
The orange box being suspect is a given, would chuck that and stay with the MSD.
You can always chase the fuel and spark issue, and if hte plugs look good, and your fuel pressure isnt bottoming out down track, I would check the springs first....
good luck,,,,car looks great....ps,,i like the helmet as well...
Doug
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Re: what's wrong...
[Re: 69CHARGERMD]
#1211847
04/08/12 02:39 PM
04/08/12 02:39 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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How to fix a high gear miss like the one in your video.
#1. Get off the internet, leave the beer in the frig and get to work.
#2. check the valve springs. If you have an inner spring broke it might not miss free revving or in low gear. If you continue to screw around your motor might die a painfull death of parts crashing into each other.
#3. Remove the fuel lines at the carbs and do a gallon jug test. See how long it takes to fill a gallon jug with your fuel system but make sure you pull the lines at the carb to fully test the system could be a collapsed line. Like someone said unless your regulators is rear of the front spindle you can get away with 3 psi. I have never needed to run over 7 psi.
#4. Borrow an ignition tester. Even a mopar unit can be tested with an MSD ignition tester. Someone close to you should have one.
#5. Throw your fuel out and get some fresh
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: what's wrong...
[Re: gregsdart]
#1211851
04/08/12 06:58 PM
04/08/12 06:58 PM
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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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Greag they only thing I did off season was replace the steering column. PS column shift (w/ adapt) to Man floor shift. BRAND new re-manned $$$$ unit. I hope it's nothing in the ignition. MrMopar, 3/8" all the way up to the reg and 3/8 to the distro block then 5/16 to each carb. The gauge runs off the reg and that line is...umm what ever the standard line is 3/16"??? Leigh worked great last year, 11.389 w/ plenty in it. Dartman, the air was super good, one guy that brings a wheater station said "we have mine shaft air" whatever that is. Not sure why that would make such a big difference. I'm running 70 jets in the mains and yes that's back into the pits after a pass. Thanks 69... thump yes that's the shift light..never turned on (6400) 
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Re: what's wrong...
[Re: VernMotor]
#1211853
04/08/12 08:37 PM
04/08/12 08:37 PM
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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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Quote:
From everything you have said..I agree it might of been lean for the DA..you have any idea what he said it was ?
The guy w/ the weather equip? He said something about 18...and something about the baramtic pressure. No idea what that all meant, I was more concerned about the 14+ mph steady head wind 
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Re: what's wrong...
[Re: VernMotor]
#1211855
04/08/12 09:34 PM
04/08/12 09:34 PM
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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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Quote:
well if he said 18ft ..that is very good air.. I would not call it mineshaft air but very good. And if you run in 2000-3000 ft da..That is alot of change depending on how your car was jet'ed to start with. It could be very lean and to add to that a headwind would make it leaner on top of that. one anytime you add load to a car it lean it and head wind pushing more air in the scoops.
the track is at 300 ft maybe, close to sea level. Thanks, cowl hood same effect?
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Re: what's wrong...
[Re: VernMotor]
#1211859
04/08/12 10:08 PM
04/08/12 10:08 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Quote:
well if he said 18ft ..that is very good air.. I would not call it mineshaft air but very good. And if you run in 2000-3000 ft da..That is alot of change depending on how your car was jet'ed to start with. It could be very lean and to add to that a headwind would make it leaner on top of that. one anytime you add load to a car it lean it and head wind pushing more air in the scoops.
You would normally jet down for bad air such as hot summer days and jet up for good cool dry air of spring and late fall if you were lean to start with then the good/mineshaft air would compound the issue and cause the miss problem, altho I do agree with a lot of the other suggestions that the guys have brought up here as possible reasons,, but I have also had a friends car that has experienced a high speed miss when the jett is too lean for the conditions like weather change's and we have to jet it up. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: what's wrong...
[Re: Kevins493]
#1211860
04/08/12 10:23 PM
04/08/12 10:23 PM
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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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Quote:
Track is actually something like 550-700 ft. Damascus is 900 ft ASL, and that's one of the closest major towns. I would replace the valve springs before you try anything else, since that's the problem that would cause the most damage and isn't even the most expensive one to fix now. Why did you stay in the throttle so long after it started breaking up?
I didn't.. only on 1-2.. 3rd was 1/2 pedal. I looked at the fuel pres gauge, then turned the meth.H2O off then took my foot off. Probably should have just let off at the 1-2 shift.
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Re: what's wrong...
[Re: 440PURSUIT]
#1211862
04/09/12 04:38 PM
04/09/12 04:38 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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Whatever the problem turns out to be, please ressurect this thread and add your findings for future reference. Mick 
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Also, was that your shift light I saw in the scoop that was covered? 
