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1970 six pack
#246817
03/08/09 12:18 PM
03/08/09 12:18 PM
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Anonymous
OP
Unregistered
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Anonymous
OP
Unregistered
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My Cuda has about 400 miles on it, everything including the Holleys are new. When I first started last summer I was getting a severe surge going down the highway and was told to bump the jets from 62 to 69. Within a week I was getting backfire through the exhaust on excelleration and the plugs were very black. I was then told to drop down to 67's and still could not keep the plugs clean but the surging pretty much went away and I was still getting backfire so last fall I changed to 64's on the jets and have not had a chance to drive the car but I started it last week and noticed a lot of black fluid comming out the tail pipe when I first started it. Do you think this was stored or do I need to go down to 63's for jets? On everyones advice I have replaced everything electrical including the pointless ignition. The one thing I have noticed is that I am able to get idle adjustment on the center carb now but with the two outboards I need to turn the bottom two screws in all the way for the car to idle properly. I was told that I should put my fingers over the two bleed holes and if adjusted properly there would be no change in idle speed. I am not able to do that and I do not know why. If there is anyone from central Wisconsin reading this and they know of a good six pack person in the area please let me know because it seems I can not get this on my own.
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Re: 1970 six pack
#246818
03/08/09 12:21 PM
03/08/09 12:21 PM
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Joined: Mar 2007
Posts: 3,285 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,285
West Coast, USA
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Have you set you float levels? Where are they set at? What is you initial and total timing set at? Have you checked for vacumn leaks?
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: 1970 six pack
[Re: mickm]
#246821
03/08/09 01:14 PM
03/08/09 01:14 PM
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Joined: Feb 2006
Posts: 643 southern conn
1969gtx
mopar
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mopar
Joined: Feb 2006
Posts: 643
southern conn
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Hi has the carbs been siting for long time and have cork gaskets change them & ck power valve if it backfires it can make a hole in the diaphragm. will let fuel leak by in to intake
1965 A/FX Plymouth 9.50 et @139 mph 1965 A/FX awb plymouth flashback [email]10.26@129mph[/email] mph on pump gas 426 hemi 1969 GTX Hemi 4 speed 12.50 et @ 112mph in F.A.S.T TRIM 1970 GTX 4406pac 4 speed 11.05 @126.9 mph in F.A.S.T TRIM http://www.AFXER.com
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Re: 1970 six pack
[Re: jbc426]
#246822
03/08/09 01:18 PM
03/08/09 01:18 PM
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Anonymous
OP
Unregistered
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Anonymous
OP
Unregistered
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floats are set at bottom of screw holes, timing is 10 degrees BTC and checked for vacuum leaks a dozen times
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Re: 1970 six pack
[Re: 1969gtx]
#246823
03/08/09 01:22 PM
03/08/09 01:22 PM
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Anonymous
OP
Unregistered
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Anonymous
OP
Unregistered
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the gaskets are not cork and the carbs are new. I have not checked the power valve but it is not backfiring through the carb, it is out the tail pipe
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Re: 1970 six pack
#246825
03/09/09 01:59 AM
03/09/09 01:59 AM
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Joined: Mar 2007
Posts: 3,285 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,285
West Coast, USA
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Quote:
floats are set at bottom of screw holes, timing is 10 degrees BTC and checked for vacuum leaks a dozen times
Do you have to bump the car to get fuel to spill out or does it trickle out when its running? Is your timing set with the vacumn advance hooked up? What distributor do you have? Has the mechanical advance been altered or is it stock?What did you do to check for the vacumn leaks, spray carb cleaner type flamable liquid?
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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