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Re: How do you tell if the "power valve" is bad??
[Re: scotts66charger]
#371748
07/10/09 02:58 PM
07/10/09 02:58 PM
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Joined: Sep 2007
Posts: 5,037
hi
sharpie
Moparts Linguist
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Moparts Linguist
Joined: Sep 2007
Posts: 5,037
hi
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They don't go bad as often as people say. How old is your Holley carb, btw? After 92 or something, they all had the check valves.
edit: to tell if it's bad, take it out, and suck on the large end. No, I'm not kidding. If you can move the sprung piece toward you, it's still good.
Last edited by sharpie; 07/10/09 04:19 PM.
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Re: How do you tell if the "power valve" is bad??
[Re: sharpie]
#371749
07/10/09 05:46 PM
07/10/09 05:46 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
They don't go bad as often as people say. How old is your Holley carb, btw? After 92 or something, they all had the check valves.
edit: to tell if it's bad, take it out, and suck on the large end. No, I'm not kidding. If you can move the sprung piece toward you, it's still good.
Well, yeah, they do. Or at least they used to. I used to rebuild Holleys "moonlight" while I was at Miramar. I've been into at least a hundred. I'd be I've found at least 5 bad power valves RIGHT OUT OF A NEW KIT.
So far a sucking on the valve, you cannot tell if it's leaking, which is what causes the problem. Another thing that causes them to "be" bad is overtightening, which warps the thing
The BEST way to tell is that a previously tuned car simply will not idle, and the idle screws have little effect. When I was doing this moonlight rebuilding, I used to mark and save valves that I knew had been OK on idle. The acid test is simple. replace with a a good valve.
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Re: How do you tell if the "power valve" is bad??
#371750
07/10/09 06:03 PM
07/10/09 06:03 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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I made an adapter fron an old spark plug boot that I use with my Mighty-Vac. I can not only tell if they leak, but I can also see at what vacuum they actually start to open and compare it to what is stamped on the valve.
Fastest 300
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Re: How do you tell if the "power valve" is bad??
[Re: Crizila]
#371751
07/10/09 06:37 PM
07/10/09 06:37 PM
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Joined: Jan 2003
Posts: 25,827
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,827
Rio Linda, CA
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Some Mighy-Vacs come with a suction cup attachment that will fit over the end of a power valve.
The INTERNET, the MISinformation superhighway
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