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Re: Cylinder Cranking Pressure on Stock 426 Hemi
[Re: torkrules]
#1417022
04/11/13 11:25 PM
04/11/13 11:25 PM
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Joined: Jan 2003
Posts: 3,905
Minnesota
3twos
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,905
Minnesota
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I think I should give up on the compression test and move forward on trying to figure out why this engine won't run. I tried 3 different testers and they are all different. What does a person have to do to take compression readings? The tester I started with is one I bought several years ago and probably used it a half dozen times and it has been in the case an that is it. I stuck it in my good running 8hp briggs and stratton snow blower tonight and could not even get 70psi on it. These things are quirky. I got the valves all adjusted and put back together and ran it tonight and there is no blow by comming out the breather at all. Absolutely nothing! I am going to start with the primary carb on saturday and see what I find. The engine starts fine and runs on high idle, once the choke opens it won't run worth a crap. I just got this car and will have to spend some time with it.I have done many compression tests over the years, why I can't test this engine is beyond me.
Al & Sheila
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Re: Cylinder Cranking Pressure on Stock 426 Hemi
[Re: mickm]
#1417025
04/12/13 03:23 AM
04/12/13 03:23 AM
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Joined: Jan 2007
Posts: 10,128
A Red State
SNK-EYZ
I Live Here
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I Live Here
Joined: Jan 2007
Posts: 10,128
A Red State
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Kinda sounds like a vacuum leak or maybe a carb issue (internal blockage).
If you can't find an obvious leak, I had a problem with a factory street Hemi intake that had a pinhole in the floor under the rear carb going into the exhaust crossover.
Took forever to find that.
Had it welded up and it idled fine after that.
Kayse can't keep up at all now. lol
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Re: Cylinder Cranking Pressure on Stock 426 Hemi
[Re: 3twos]
#1417026
04/12/13 10:49 AM
04/12/13 10:49 AM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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I wonder if your not getting the compression testers seated down in there?? What year is it and is the distributor any good?? They are famous for the upper shaft bushing wearing and it flopping all around??? Even the advance weights may be stuck 
Last edited by Dodgem; 04/12/13 10:54 AM.
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Re: Cylinder Cranking Pressure on Stock 426 Hemi
[Re: Dodgem]
#1417027
04/12/13 09:54 PM
04/12/13 09:54 PM
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Joined: Jun 2004
Posts: 3,319
Chicago Burbs
sthemi
master
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master
Joined: Jun 2004
Posts: 3,319
Chicago Burbs
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could be a bit of dirt in the idle passage.. the backyard fix for it is to remove the mixture screws and blow into the holes with compressed air. reassemble and try it. cost is zero.. 
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Re: Cylinder Cranking Pressure on Stock 426 Hemi
[Re: SNK-EYZ]
#1417028
04/13/13 10:00 AM
04/13/13 10:00 AM
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Joined: Apr 2012
Posts: 294
Oregon
KillerCuda
enthusiast
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enthusiast
Joined: Apr 2012
Posts: 294
Oregon
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Quote:
Kinda sounds like a vacuum leak or maybe a carb issue (internal blockage).
If you can't find an obvious leak, I had a problem with a factory street Hemi intake that had a pinhole in the floor under the rear carb going into the exhaust crossover.
Took forever to find that.
Had it welded up and it idled fine after that.
man, that one must have been a head scratcher! i have never heard of that, and probably would have never even thought to have checked that.
d
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