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Distributor Cap Blow off
#983764
05/01/11 08:43 AM
05/01/11 08:43 AM
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Joined: May 2010
Posts: 59
Rhode Island
Caparco
OP
member
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OP
member
Joined: May 2010
Posts: 59
Rhode Island
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Having trouble with my Cap blowing off when I get up on the gas to pass or from a stop, Doesn't come right off just one side pops and cocks to the right, throws it way out of time.
Tried to adjust (bend back) the thin metal 'barbie pin' clip, worked a little but soon re-accured. I don't think drilling a vent hole in it is good as presure is good there. right?.. would some Twine burn up in the compatment? What are your thoughts
And yes I don't see anything in the way under the hood would be in the way when the engine lifts from exceleration, seems to be just Presure.
Marcus
~ 72 Dodge Challenger ~
~ 97 Dodge Neon ~
~ 97 Dodge Ram ~
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Re: Distributor Cap Blow off
[Re: Caparco]
#983766
05/01/11 09:06 AM
05/01/11 09:06 AM
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Joined: May 2007
Posts: 952
Queens, N. Y.
FASTBACK340
super stock
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super stock
Joined: May 2007
Posts: 952
Queens, N. Y.
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The only things that come to mind are either the rotor is rising and pushing the cap off, or maybe the shaft is bent or the shaft bushing is shot.
I'm curious on this one....
`68 Barracuda 340-S
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Re: Distributor Cap Blow off
[Re: Mopar_Country]
#983771
05/01/11 07:57 PM
05/01/11 07:57 PM
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Joined: Apr 2010
Posts: 10,570
Sunny South Florida
Golden-Arm
I Live Here
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I Live Here
Joined: Apr 2010
Posts: 10,570
Sunny South Florida
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caps have a vent, with a little cover over it. there shouldnt be anything making that much presure inside the cap, unless you are getting crankcase pressure leaking up the shaft, into the cap. i suspect you'd see a lot of oil coming up and into the housing, if this was true. snap the cap on and then try to lift or wiggle it off. it shouldnt really move. of it does, something isnt right. i've had junk caps, that just wouldnt mount properly, and could be moved off the dizzy, when clipped down. replacing with a quality cap fixed it for me.  you didnt mention engine size, but if you have a small block, make sure you dont have a broken motor mount. the engine twisting when torqued from a stop, could drive the dizzy into the firewall, and pop the cap. (depending on clearance in your particular car)
"When Tyranny Becomes Law, Rebellion Becomes Duty"
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Re: Distributor Cap Blow off
[Re: 62maxwgn]
#983776
05/02/11 07:51 AM
05/02/11 07:51 AM
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Joined: Jan 2003
Posts: 75,386
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,386
A gulag near you.
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Quote:
John,ever see gas inside a distributor ?
No I haven't but I knew as soon as I posted that there would be someone contradicting it .
Think I'll hang in the general section from now on , hippo and penguin talk is getting more interesting by he day
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Re: Distributor Cap Blow off
[Re: JohnRR]
#983779
05/02/11 12:20 PM
05/02/11 12:20 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:
Quote:
John,ever see gas inside a distributor ?
No I haven't but I knew as soon as I posted that there would be someone contradicting it .
Boy John,never knew you were that easily offended. Why do you suppose they vent a cap ? !!!!! 
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Re: Distributor Cap Blow off
[Re: 62maxwgn]
#983780
05/02/11 12:25 PM
05/02/11 12:25 PM
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Joined: Jan 2003
Posts: 75,386
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,386
A gulag near you.
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Quote:
Quote:
Quote:
John,ever see gas inside a distributor ?
No I haven't but I knew as soon as I posted that there would be someone contradicting it .
Boy John,never knew you were that easily offended !!!!!
I'm not offended easily , my memory isn't as good as i thought it was I guess, I need to just sit back and  and let others that have the answers do the talking, maybe I'll learn something. I have personally NEVER had a cap come off on any vehicle I have own that had a distributor cap.
I could have sworn I have seen an extra hole or 2 in the bottom of a distributor housing, the alum chrysler single point anyway ???
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Re: Distributor Cap Blow off
[Re: 62maxwgn]
#983781
05/02/11 12:35 PM
05/02/11 12:35 PM
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Joined: May 2003
Posts: 15,495
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,495
Florida
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caps have vents to let positive charged ions out,when they build up inside the cap it can cause carbon tracking and mis-fires. used to see it on roundy round dirt track cars,mostly with the chebby HEI dizzys and big fat caps. dont think it blows the cap off though  
Last edited by scratchnfotraction; 05/02/11 12:59 PM.
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Re: Distributor Cap Blow off
[Re: scratchnfotraction]
#983782
05/02/11 12:48 PM
05/02/11 12:48 PM
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Joined: Jan 2003
Posts: 75,386
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,386
A gulag near you.
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Quote:
caps have vents to let positive charged ions out,when they build up inside the cap it can cause carbon tracking and mis-fires.
used to see it on roundy round dirt track cars,mostly with the chebby HEI dizzys and big fat caps.
dont think it blows the cap of though
I can see that . Reason you don't see it blow the cap of an HEI I guess would be because it is bolted down ?
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now I know why chebby used screws on the cap.