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 4Likes
10-16-2012, 07:58 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by blykins
Well, it could be a few things....
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I'll betcha a bottle of cam break-in goo that if he removes the breathers from both valve covers, fires it up, and puts his hands over the holes he'll feel the leak. Or use aluminum HVAC tape over them to see the suction. That's what we used to do when we were young, dumb, and broke....  If it tries to suck the tape in to the valve covers then he can tweak the carb 'til the cows come home and he's not going to fix the problem. |
10-16-2012, 08:21 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
I always assume everything is mechanically sound in something like this....otherwise the brainstorming/parts chasing would be endless.
Always a possibility for a leak though.
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10-16-2012, 08:31 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by blykins
Always a possibility for a leak though.
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John, maybe you could humor us and just put some tape over the valve cover holes, start her up, and see if it looks like it's trying to suck the tape in. You might even go one step further and stick the vacuum gauge on the dipstick tube after you've sealed up the holes, too. If you eliminate the specter of an internal vacuum leak, and propane around the outside does nothing, then that will put your mind at rest. |
10-16-2012, 04:22 PM
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CC Member
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Join Date: Nov 2007
Location: Clayton,
IN
Cobra Make, Engine: ERA 838
Posts: 1,146
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Not Ranked
When I put the carb on I tested for vac leaks with my propane torch. Blow gas along intake gaskets and around carb and look for idle changes. None.
With the PVC unhooked, the engine blows some oil mist from the valve covers.
Vac is close to 11 at normal idle speed of about 900.
John |
10-16-2012, 04:33 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Alright.... I can only imagine the frustration that you're going through with what usually is a one-weekend job, if that.  |
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