360 not runnin right.
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360 not runnin right.
I bought a good runnin 360 with a 4 barrel on it to put in my 64 4x4 and it set for a few years, it ran real good when I brought it home, now when you start it it fouls out number 5 and 7 with gas, can any one help me?
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Joined: Mar 2002
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From: Boise, Idaho
Stuck rings or valves. With the truck warmed up, pull the plug wires off one by one and check to see how much the idle speed drops off. If the two cylinders don't cause the engine speed to drop, they've probably got stuck/bent valves. Do a compression check.
Try pulling the plugs and spraying PB Blaster into the plug holes to loosen the rings. Let it soak.
BTW, be sure to add STP, GM EOS, or WalMart TechLube to keep the cam lubed. Motor oil no longer has ZDDP in it and you cam can have its lobes wiped out because of the missing lube.
Try pulling the plugs and spraying PB Blaster into the plug holes to loosen the rings. Let it soak.
BTW, be sure to add STP, GM EOS, or WalMart TechLube to keep the cam lubed. Motor oil no longer has ZDDP in it and you cam can have its lobes wiped out because of the missing lube.
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From: Boise, Idaho
Originally Posted by scamardo
Do you use the additive with every oil change now?
I did a web search on Zinc Diaryl DithioPhospate and found a very interesting PDF by a university in Texas that was trying to find a substitute for ZDDP. Catalytic converters get poisoned by the Zinc in ZDDP so they're trying to find a substitute for it but it hasn't been easy.
If your vehicle doesn't have a catalytic converter, be sure to use it. If it does, use it sparingly.
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From: Union, Washington
Originally Posted by pcmenten
Good question. It's critical that it be done soon after a new cam is installed. It leaves a layer on the lobes and faces of the lifters. After that I'd do it at least every other oil change. I do it with every oil change on my MGB and 86 Mustang 5.0. Not a lot, about an ounce, enough to keep the film on the cam.
I did a web search on Zinc Diaryl DithioPhospate and found a very interesting PDF by a university in Texas that was trying to find a substitute for ZDDP. Catalytic converters get poisoned by the Zinc in ZDDP so they're trying to find a substitute for it but it hasn't been easy.
If your vehicle doesn't have a catalytic converter, be sure to use it. If it does, use it sparingly.
I did a web search on Zinc Diaryl DithioPhospate and found a very interesting PDF by a university in Texas that was trying to find a substitute for ZDDP. Catalytic converters get poisoned by the Zinc in ZDDP so they're trying to find a substitute for it but it hasn't been easy.
If your vehicle doesn't have a catalytic converter, be sure to use it. If it does, use it sparingly.
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From: Boise, Idaho
Originally Posted by Bear 45/70
How does something get from the crank case to the catalytic converter in a properly running engine? And what does if any would have to be minute even in a worn engine if you only put an ounce in your crankcase.
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Post Fiend
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From: Iowa
Bear, that's a very good point. However, Zinc Dialkyldithiophosphate (ZDDP) does poison catylitic converters. In a normally running engine that's not burning oil, it's not a problem. However, the government is making automakers warranty emissions equipment longer, and the API has severely reduced ZDDP in the oil because of this. Because all new engines, and most made in the last 10 years have roller cams, it's not a big issue. On old engines with well-broken-in cams with established wear patterns, there is enough ZDDP left to protect the cam. Also, on an engine that goes 200,000 miles, the number of quarts of burned oil does add up. The ZDDP is VERY effective at plating the catylists in a catylitic converter. It only takes a very thin layer on the catylists to keep them from doing their job.
The problem comes with the enthusiast putting together a motor with a new flat tappet cam. There is not enough ZDDP in API SM rated oils to allow the cam to correctly establish a wear pattern with the lifters. This results in a higher percentage of cams going flat.
The problem comes with the enthusiast putting together a motor with a new flat tappet cam. There is not enough ZDDP in API SM rated oils to allow the cam to correctly establish a wear pattern with the lifters. This results in a higher percentage of cams going flat.
Last edited by rusty70f100; Aug 28, 2005 at 08:37 PM.
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Postmaster
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Originally Posted by Bear 45/70
How does something get from the crank case to the catalytic converter in a properly running engine? And what does if any would have to be minute even in a worn engine if you only put an ounce in your crankcase.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
Originally Posted by 76supercab2
Good quesiton. I believe the answer is "Positive Crankcase Ventilation System".
Lead Driver
Joined: Oct 2004
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From: Central Oregon
Originally Posted by 1964 4x4
I bought a good runnin 360 with a 4 barrel on it to put in my 64 4x4 and it set for a few years, it ran real good when I brought it home, now when you start it it fouls out number 5 and 7 with gas, can any one help me?
Postmaster
Joined: Feb 2003
Posts: 4,043
Likes: 4
Originally Posted by Bear 45/70
Are you trying to tell me this stuff will vaporize then reconstitute in the combustion chamber? I doubt that very much. I will buy Rusty's explaination though.
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