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Re: What could cause this?
[Re: Pacnorthcuda]
#1016861
06/21/11 02:03 PM
06/21/11 02:03 PM
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Joined: Apr 2005
Posts: 1,322
Michigan
crlush
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,322
Michigan
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Quote:
Quote:
Pull the needle and seats......clean them. Stuck float.
 I would suspect a needle & seat issue.
needle and seat, garbage in fuel bowl, or no gas tank vent, which is pressurizing tank and overcoming needle and seat, when it does it unscrew your gas cap and see if you get a rush of air.
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Re: What could cause this?
[Re: 70Cuda383]
#1016863
06/21/11 03:56 PM
06/21/11 03:56 PM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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IMO, you don't have enough initial timing at 10BTDC with that cam. Try 16* or more. If you give the engine more initial and it picks up RPM, it wants that additional timing. I generally put as much initial on it as it will take, still start when hot, no starter kick back or straining starter. You'll have to limit the distributor mechanical advance to hit your desired total timing. Fuel shooting out the carb is a bad thing and needs to be addressed as mentioned. Most likely dirt in needle/seat or it's just bad, stuck/sunk float. Get that fixed up. Make sure your fuel filter is good and you don't have rust in fuel line/tank. Here's a really solid write up on 6 pack tuning from the tech section. http://www.moparts.org/Tech/Archive/fuel/7.htmlGet the initial figured out and reset your idle adjustments.
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Re: What could cause this?
[Re: 70Cuda383]
#1016864
06/21/11 04:33 PM
06/21/11 04:33 PM
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Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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Quote:
Thanks. It also makes it easier to read when it's not full caps.
Not if you have bad eyes !!  
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Re: What could cause this?
[Re: 73rrak]
#1016866
06/22/11 12:29 PM
06/22/11 12:29 PM
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Joined: Jun 2006
Posts: 733
Long Island NY
yellow sixpack
OP
super stock
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OP
super stock
Joined: Jun 2006
Posts: 733
Long Island NY
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Thanks guys all great stuff going through it all.
Rob
If you can't be smart.....don't be stupid!
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Re: What could cause this?
[Re: yellow sixpack]
#1016867
06/22/11 01:13 PM
06/22/11 01:13 PM
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Joined: Jan 2008
Posts: 3,886
Lost and Spaced
bboogieart
master
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master
Joined: Jan 2008
Posts: 3,886
Lost and Spaced
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Quote "or no gas tank vent, which is pressurizing tank and overcoming needle and seat, when it does it unscrew your gas cap and see if you get a rush of air"  Two posts to this affect. I believe this is backwards, the tank would not be pressurized but would become a vacuum tank and not allow gas out. The woosh you hear is air getting sucked back in. Think about it. Suck gas out of a none vented tank. How would that creat positive pressure. An electric pump could over pressurise the needle seat though. Needs a return line. I agree on changing you oil pronto. Always remember oil is cheaper than iron. 
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Re: What could cause this?
[Re: yellow sixpack]
#1016868
06/22/11 01:34 PM
06/22/11 01:34 PM
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
My 440 sixpack at start up is running great after 1/2 hr or so of street driving the car starts to run sloppy and stall at every stop sign and red light. The engine has a comp cam# 21 227-4.timing at 10 btdc engine compr 9.7/1. Also when I am trying to start it at this point fuel shoots out of center carb like a fountain....fooled with mixture screws still cant get it to run right. I let the car cool...drive it again starts all over. Also checked timing does not jump. Thanks Rob
If fuel is coming out of the carb you need to fix that first. Check fuel pressure should be 3-5 psi, Check needle and seat assembly, and that the "O" rings are in good shape. If the "O" rings are bad fuel will go around the needle and seat and flood the carb. Also remove the float and shake it to make sure fuel is not getting inside the float. I had a float with a pinhole in it and it would run fine for a time, but then fuel would get into the float and sink it, then the carb would flood.
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