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Re: My new heads are killing me need help [Re: a493demon] #2540599
08/23/18 08:29 PM
08/23/18 08:29 PM
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So. Burlington, Vt.
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fast68plymouth Offline
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Originally Posted By a493demon
Prob. the dist pick up .
If it's MSD I had one go out on mine .


Quote:

Checked wiring
Checked timing
Checked comp test 170-175
Checked leak down was not a noticeable difference
Checked cap and rotor
Checked crank trigger
Checked ignition box/ tried my 7al

wave


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: My new heads are killing me need help [Re: 70dusterjohn] #2540658
08/23/18 11:22 PM
08/23/18 11:22 PM
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Texas
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RustyM Offline
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fwiw- I think I mentioned we have been having problems with Msd units- its been the connector between the distributer to the box.
Maybe a bad run of connectors- who knows.

Indications; Power drop, running rich, then missing, then just fine, then missing, then rich.
Apparently it causes some type of signal jiggle the msd box doesn't like- at all.

I thought i had mentioned you might want to check that but it may have been some other thread.

If you use an msd checker only you can miss the problem if the connection is solid when you are checking.
Check that little connecter- wiggle it a little with engine at 2000rpm.
If thats the problem, you WILL hear it and feel it.
Msd box may be warmer as well.
Whatever that flakey connection issue does to the MSD 6AL, 6 AL2, 7- It doesn't like it one bit.
fyi

Re: My new heads are killing me need help [Re: 70dusterjohn] #2540678
08/24/18 12:13 AM
08/24/18 12:13 AM
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Posts: 1,613
Deerfield, Ohio
70dusterjohn Offline OP
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Deerfield, Ohio
The box was bad . Changed it out and all is right with the World 🌎.... seems to have pick up a bunch of power of course that’s set of the pants feeling .. we shall see thanks for all the replies it really helped ...👍🏻

Re: My new heads are killing me need help [Re: 70dusterjohn] #2540709
08/24/18 01:40 AM
08/24/18 01:40 AM
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tjmarcus1 Offline
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I am confused too! Is the motor in the car or out? Why did you not make a full pass?

Re: My new heads are killing me need help [Re: 70dusterjohn] #2540786
08/24/18 09:31 AM
08/24/18 09:31 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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You have lost so much power, and right on the launch. That says it must be the ignition some how. Ther would be enuogh fuel in the bowls to carry you almost to the 60 ft clocks. Bad coil? Trigger wire picking up signal from another wire, poor conection, hopefully you do NOT have ignition wired any where through stock wiring. Coil wire have a break or bad connection?

Last edited by gregsdart; 08/24/18 09:32 AM.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: My new heads are killing me need help [Re: tjmarcus1] #2540790
08/24/18 09:47 AM
08/24/18 09:47 AM
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Deerfield, Ohio
70dusterjohn Offline OP
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Originally Posted By tjmarcus1
I am confused too! Is the motor in the car or out? Why did you not make a full pass?




Was out put it back in. I put zippers on it so it’s easier 😂

Re: My new heads are killing me need help [Re: gregsdart] #2540792
08/24/18 09:49 AM
08/24/18 09:49 AM
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Deerfield, Ohio
70dusterjohn Offline OP
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Originally Posted By gregsdart
You have lost so much power, and right on the launch. That says it must be the ignition some how. Ther would be enuogh fuel in the bowls to carry you almost to the 60 ft clocks. Bad coil? Trigger wire picking up signal from another wire, poor conection, hopefully you do NOT have ignition wired any where through stock wiring. Coil wire have a break or bad connection?



Was the msd box ..

Re: My new heads are killing me need help [Re: 70dusterjohn] #2540818
08/24/18 11:36 AM
08/24/18 11:36 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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When you get a full good pass, then you will have absolute proof all is well. Like RedGreen says, we're pullin for ya😀😀


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: My new heads are killing me need help [Re: 70dusterjohn] #2541066
08/24/18 10:47 PM
08/24/18 10:47 PM
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Deerfield, Ohio
70dusterjohn Offline OP
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Well just took it up the road and it feels like a beast. It never felt that way on the street so I’m hoping I’m going in the right direction. Thanks for all the input ...

Re: My new heads are killing me need help [Re: 70dusterjohn] #2541162
08/25/18 08:34 AM
08/25/18 08:34 AM
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Akron, Ohio
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Good luck John


1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
Re: My new heads are killing me need help [Re: 70dusterjohn] #2541251
08/25/18 01:54 PM
08/25/18 01:54 PM
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Bend,OR USA
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Did you run it out in high gear? If not maybe you should before going to the track scope twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: My new heads are killing me need help [Re: 70dusterjohn] #2541351
08/25/18 07:52 PM
08/25/18 07:52 PM
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Deerfield, Ohio
70dusterjohn Offline OP
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Yes ran it as far as the RPM would let me lol, and it was pulling harder than I can even imagine. So I’m hopeful we will be moving in the right direction

Re: My new heads are killing me need help [Re: 70dusterjohn] #2541362
08/25/18 08:34 PM
08/25/18 08:34 PM
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Deerfield, Ohio
70dusterjohn Offline OP
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Oh also I forgot I was using a g-tech for speed 1/4 mile, so the results where pretty good just let it roll out then hitting it hard .

Re: My new heads are killing me need help [Re: 70dusterjohn] #2541462
08/26/18 03:05 AM
08/26/18 03:05 AM
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pacific northwest
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Stroker Scamp Offline
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Glad you found the problem, post the results


footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
Re: My new heads are killing me need help [Re: 70dusterjohn] #2541728
08/26/18 08:24 PM
08/26/18 08:24 PM
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Deerfield, Ohio
70dusterjohn Offline OP
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Okay so went to the track today and it ran the same as before . I’m really getting tired of trying things and nothing working .. I’m down some serious power .. I don’t know what else to look at ..

Re: My new heads are killing me need help [Re: 70dusterjohn] #2541742
08/26/18 09:17 PM
08/26/18 09:17 PM
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Charlotte, North Carolina
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Same as before 10.50's or same as before 9.70's? I thought that your G tech showed marked improvement. What changed since your street run the other day?


[image][/image]
Re: My new heads are killing me need help [Re: 70dusterjohn] #2541757
08/26/18 10:24 PM
08/26/18 10:24 PM
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Deerfield, Ohio
70dusterjohn Offline OP
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Nothing changed I don’t put a lot of stick in the g-meters . Zone run there where over 500 cars . I was not waiting for another run for 2 hours . It went 10.55 st 136 ? I just don’t get it . It comes out kinda flat and then really starts to come on. I went from a best 60ft of 1.28 to today a 1.75 ... I don’t know what to do at this point ..

Re: My new heads are killing me need help [Re: 70dusterjohn] #2541764
08/26/18 10:36 PM
08/26/18 10:36 PM
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Washington
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madscientist Offline
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Look at the converter. Something is eating power.

I'd pull the engine and get it on the dyno to rule that out.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: My new heads are killing me need help [Re: 70dusterjohn] #2541804
08/26/18 11:40 PM
08/26/18 11:40 PM
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Charlotte, North Carolina
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136 mph? That's fast enough for a 9.70 pass. Something is wrong on the launch. The top end charge seems to be real strong. Carb, ignition, cam centerline?


[image][/image]
Re: My new heads are killing me need help [Re: 70dusterjohn] #2541814
08/27/18 12:08 AM
08/27/18 12:08 AM
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Bend,OR USA
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Originally Posted By 70dusterjohn
It went 10.55 st 136 ? I just don’t get it . It comes out kinda flat and then really starts to come on. I went from a best 60ft of 1.28 to today a 1.75 ... I don’t know what to do at this point ..

It looks like converter time to me whiney Have it checked now before pulling all your hair out up whistling


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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