Freeze plug blows out @ 105 mph
#481136
09/27/09 02:03 PM
09/27/09 02:03 PM
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Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
67HEMI
OP
super stock
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OP
super stock
Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
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I was at arm drop live in Memphis Friday. It had rained all week and the track was green so I let a few cars go ahead of me to down a little rubber.The routine was the same as always, 160 degrees, roll through the water, 2nd to 3rd for a 3 second burnout, roll in,stage,launch, it only had a 1.45 60 foot,ran a 6.63 @ 102 then I heard a pop and the front end dropped. I thought a ball joint broke so I just coasted on through the lights.Then I saw water coming up through the edge of the hood so I cut it off.The freeze plug behind the drivers side motor mount blew out. I think that is what saved me as the motor mount dispersed the water as it came out. The freeze plug is brass but is very shallow like a 1/8 shoulder.They were already installed in the block when I bought the car 4 years ago. I will be putting in the deep ones with a 1/4 inch shoulder. I am very thankful to have not hit the wall  Any ideas what might have caused it to come out? Block flex or just the shallow shoulder combined with the narrow block shoulder or something else?
'33 Plymouth 5 Window Coupe Blown Aluminum HEMI w/bolt ons (under construction)
'69 Chrysler 300 Convertible 375 HP 440
'71 Plymouth Duster 360 W/EFI (Wife's Ride)
'12 Ram MegaCab Dually 6.7 Cummins
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Re: Freeze plug blows out @ 105 mph
[Re: BBLM23]
#481138
09/27/09 03:56 PM
09/27/09 03:56 PM
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Joined: Jan 2003
Posts: 1,235
TN
65racer
2009 IHRA World Champion
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2009 IHRA World Champion
Joined: Jan 2003
Posts: 1,235
TN
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Had the same problem with mine last season, only I lost the same 1 twice, never could see, or figure out why this problem started to occur, I had ran the block several season before, and never any problems ,mine was in the middle hole on the pass side of the block, thought it might have been brass plug related, so I changed brands of plugs, and had it happen again, after the second time I used one of those rubber squeeze type, and have had no more problems with it since, knock on wood, have never figured out why this just started happening, but as you know it is not any fun when it happens, I almost stuffed mine in the wall the first time, but luckily it recovered before any contact, but the car had an awful smell inside for a while  . Be extra careful with it if you go with another brass plug,  it could happen again, which I hope you don't have any problems with it, I though when mine did it the first time it was just one of those fluke deals, but after the 2nd time, that theory was out the window. Good luck Dave
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Re: Freeze plug blows out @ 105 mph
[Re: 65racer]
#481139
09/27/09 04:05 PM
09/27/09 04:05 PM
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Joined: Feb 2007
Posts: 6,295
U.S.
moparniac
master
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master
Joined: Feb 2007
Posts: 6,295
U.S.
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did you have antifreeze in the car..... rich is a stickler about that! glad everything was okay...... Im so glad my new block has screw in ones..... that happened to me one time going down the street!  Try this below! 
Last edited by *WeDgiE*; 09/27/09 04:06 PM.
Mopar Performance
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Re: Freeze plug blows out @ 105 mph
[Re: moparniac]
#481140
09/27/09 04:38 PM
09/27/09 04:38 PM
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Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
67HEMI
OP
super stock
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OP
super stock
Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
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No all I had was water and water wetter in it. With antifreeze it might have gotten real ugly!!I like the CHINESE freeze plug picture  That is a good idea with the screws or I thought about tapping the block and using screw in type.
'33 Plymouth 5 Window Coupe Blown Aluminum HEMI w/bolt ons (under construction)
'69 Chrysler 300 Convertible 375 HP 440
'71 Plymouth Duster 360 W/EFI (Wife's Ride)
'12 Ram MegaCab Dually 6.7 Cummins
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Re: Freeze plug blows out @ 105 mph
[Re: Mike Swann]
#481146
09/27/09 10:54 PM
09/27/09 10:54 PM
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Joined: Jun 2005
Posts: 1,283
Colorado,U.S.A
4404dart
pro stock
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pro stock
Joined: Jun 2005
Posts: 1,283
Colorado,U.S.A
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Quote:
Quote:
I have been fighting this same problem for a long time, a member on here said that detonation will shake them out, I'm thinking that might be the case.
Yep, I have first hand experience with this. The plug falling out is symptom of problem.
A friend crashed his Firebird this summer, because of a freeze plug coming out. We were spraying it for the first time this year and I put a little more jst in then before, well it took off and was on a low 9 sec pass, the plug came out, went left, then right into the wall. we've already fixed it, but I'm nervous to take it out again. 
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