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Re: Distributor Cap Blow off
[Re: 62maxwgn]
#983784
05/02/11 01:21 PM
05/02/11 01:21 PM
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Joined: Apr 2010
Posts: 1,216
Under My Car
Mopar_Country
pro stock
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pro stock
Joined: Apr 2010
Posts: 1,216
Under My Car
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Boy John,never knew you were that easily offended. Why do you suppose they vent a cap ? !!!!! 
A lot of it has to do with moisture, the vent gives it somewhere to go instead of creating corrosion.
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Re: Distributor Cap Blow off
[Re: Mopar_Country]
#983785
05/02/11 01:25 PM
05/02/11 01:25 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Boy John,never knew you were that easily offended. Why do you suppose they vent a cap ? !!!!!
A lot of it has to do with moisture, the vent gives it somewhere to go instead of creating corrosion.
Yea, it's not there to relieve pressure. The OP either has a cheaper dist cap, cheaper dist or it's not on right. imo Maybe he has wrong parts too.
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Re: Distributor Cap Blow off
[Re: RemCharger]
#983787
05/02/11 01:36 PM
05/02/11 01:36 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
I wd40'd my weights once, fired it up and,..POW! blew the sucker right off. Thats the closest I've seen. 
 
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Re: Distributor Cap Blow off
[Re: Evil Spirit]
#983788
05/02/11 01:44 PM
05/02/11 01:44 PM
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Joined: Apr 2010
Posts: 1,216
Under My Car
Mopar_Country
pro stock
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pro stock
Joined: Apr 2010
Posts: 1,216
Under My Car
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Quote:
Vacuum advance diaphragm can fail, letting gasoline vapors get into distributor, ignite, and blow cap off. AMC's had this problem mid/late 70's. 
Evil Spirit may have nailed it.
Because I am inquisitive in nature I had to ask. Spoke with an acquaintance of mine and he said the same thing, check your vac canister, after shut down gas vapors can come up the vac line and fill the cap with enough vapor to pop it of upon start.
That's not something I would have ever thought, and I have never seen it happen.
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Re: Distributor Cap Blow off
[Re: Mopar_Country]
#983789
05/02/11 02:03 PM
05/02/11 02:03 PM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
Vacuum advance diaphragm can fail, letting gasoline vapors get into distributor, ignite, and blow cap off. AMC's had this problem mid/late 70's.
Evil Spirit may have nailed it.
Because I am inquisitive in nature I had to ask. Spoke with an acquaintance of mine and he said the same thing, check your vac canister, after shut down gas vapors can come up the vac line and fill the cap with enough vapor to pop it of upon start.
That's not something I would have ever thought, and I have never seen it happen.
If that was the case, it would blow off as soon as he starts the car, which is not happening.
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Re: Distributor Cap Blow off
[Re: imfixinmopars426]
#983791
05/03/11 05:33 PM
05/03/11 05:33 PM
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Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
StandOnIt
super stock
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super stock
Joined: Nov 2006
Posts: 1,086
Baton Rouge, La.
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I have a brand new cap in the top of my tool box that won't stay put on the dist. It rocks back and forth popping the clips loose. I went and bought an accel cap and it didn't rock. Been running it wide open for a few years now without an issue. I don't really know why I haven't thrown that other one away yet. I guess its the horder in me...haaaaa.
I did have a small block ford dist grenade on me one time driving down the road. I was on the gas pretty good too. Put another cap and sleeve (busted that too) on it and took off again. Never did it again....
76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.
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Re: Distributor Cap Blow off
[Re: Evil Spirit]
#983793
05/04/11 07:41 PM
05/04/11 07:41 PM
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Joined: Nov 2008
Posts: 1,565
tennessee
pushbutton
pro stock
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pro stock
Joined: Nov 2008
Posts: 1,565
tennessee
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Quote:
Vacuum advance diaphram can fail, letting gasoline vapors get into distributor, ignite, and blow cap off. AMC's had this problem mid/late 70's.
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Re: Distributor Cap Blow off
[Re: Caparco]
#983795
05/05/11 09:21 AM
05/05/11 09:21 AM
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Joined: Jan 2003
Posts: 5,270
Missouri
MY340
master
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master
Joined: Jan 2003
Posts: 5,270
Missouri
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Had a 79 Scout Terra with Chrysler electronic ignition and the cap kept coming off due to the clip issue on one side. I wired it down if I remember and no more problems with it coming loose.
1970 FE5 Duster 360/904/3.91's SOLD
1973 TB3 SpaceDuster 340/4spd/4.10's SOLD
Moparless for now but when the opportunity is right I'll have another one.
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Re: Distributor Cap Blow off
[Re: Challenger 1]
#983796
05/07/11 06:24 AM
05/07/11 06:24 AM
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Joined: Mar 2010
Posts: 357
Lake Elmo, MN
Evil Monkey
enthusiast
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enthusiast
Joined: Mar 2010
Posts: 357
Lake Elmo, MN
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Quote:
Quote:
Quote:
Vacuum advance diaphragm can fail, letting gasoline vapors get into distributor, ignite, and blow cap off. AMC's had this problem mid/late 70's.
Evil Spirit may have nailed it.
Because I am inquisitive in nature I had to ask. Spoke with an acquaintance of mine and he said the same thing, check your vac canister, after shut down gas vapors can come up the vac line and fill the cap with enough vapor to pop it of upon start.
That's not something I would have ever thought, and I have never seen it happen.
If that was the case, it would blow off as soon as he starts the car, which is not happening.
That's exactly what would happen on my 75 Jeep CJ7. It would only happen when starting the car - never happened driving down the road. As soon as I cranked the starter, there would be a big bang from the distributor cap hitting the hood - maybe happened 1 out of 5 times I started the car. Popped the hood, clipped the distributor cap back on, and it would fire right up. I thought someone was messing with me the first few times it happened. Eventually I found out about the vacuum canister problem, replaced it, and it never happened again.
I used to have one of the clips come loose on the cap of the 318 in my 5th Ave. I re-bent the clip a few times until I got it so that it wouldn't come off any more, but it took a few tries to get it right. It seemed to be twisted a little and I'm guessing that's what caused it to pop off.
1974 'Cuda 360/TKO
1990 Ram Van
1998 Neon
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Re: Distributor Cap Blow off
[Re: Evil Monkey]
#983797
05/07/11 08:43 AM
05/07/11 08:43 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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As said the clips need the same bend/tension on each side which is rarely a prob. I think the prob is the cap & I'd R&R it & maybe the clips from a junk dist & I'm assuming there is no rotor interference
live every 24 hour block of time like it's your last day on earth
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Re: Distributor Cap Blow off
[Re: RapidRobert]
#983798
05/07/11 09:59 AM
05/07/11 09:59 AM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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The vacuum advance canister has no real direct path to the distributor internals in a stock Chrysler distributor. there are too many areas to vent any gas fumes out to atmosphere before it gets to the internals.
I doubt it's fumes.
It's possibly a worn distributor allow the shaft to move around knocking the cap loose or it's a bad cap.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: Distributor Cap Blow off
[Re: badblubeee]
#983800
05/31/11 07:22 PM
05/31/11 07:22 PM
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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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No this is not when I start.. starts fine.. its when you really give it the gas.. from a stop or passing on highway and I can't make it pop off in park reving the engine or with my head under the hood , in fear of damaging something! And blowing off isn't real correct.. the 2 clips stay on and it just cocks to one side.. throwing the timing way off.. popping and choking un- drivable someone said tie it down... but I really don't like this at all!!..LOL may work, ill have to see when i get her running but isn't this a electrical hazard!!.. lol got to be a better answer! 
~ 72 Dodge Challenger ~
~ 97 Dodge Neon ~
~ 97 Dodge Ram ~
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