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Kabooom... back fire thru carb
#441615
08/17/09 10:56 PM
08/17/09 10:56 PM
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Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
Jeepmon
OP
master
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OP
master
Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
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I thought I would share this with you since its something I have never seen, heard about or ever experienced.. Being a skool boy learning this nitrous stuff.. I made a silly little error that could have been quite costly.. Luckily, the motor seems to be ok.. In the pits this last weekend, we hooked up the bottle, put the warmer on it and got it up to temp.. For some dumb reason, I decided to purge it by using the micro-switch on the gas pedal.. I know.. I know.. what was I thinking  An hour or so later, they called my number for first round time trials and I hopped in the car and was all excited to break new ET's and MPH... I crank over the motor and KABOOOOM !!! people 6 rows away ducked for cover.. The ol nitrous back fire.. Well.... we needed to put all the rubber vacuum lines back on the carb and then decided to fire it up to see if there was any damage.. the motor fired right up, but shot up to 3500 rpm.. Turned off the motor and looked everything over once again.. turned on the fuel pump, no fuel running down the carb.. so we fired it back up... right up to 3500 rpm and fuel was gushin into the secondaries..  Decided to miss the 1st round and pull off the carb and to my surprise, the backfire bent both butterflies on the secondary almost a good 70 degrees pointing upward... which explains why the motor raced to 3500 rpm... We flattened them back out and the motor seems to have survived without any issues..  However this was sooooo freak, I thought I would share it with you guys...
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Re: Kabooom... back fire thru carb
[Re: Jeepmon]
#441619
08/17/09 11:11 PM
08/17/09 11:11 PM
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Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
I thought I would share this with you since its something I have never seen, heard about or ever experienced..
Being a skool boy learning this nitrous stuff.. I made a silly little error that could have been quite costly.. Luckily, the motor seems to be ok..
In the pits this last weekend, we hooked up the bottle, put the warmer on it and got it up to temp.. For some dumb reason, I decided to purge it by using the micro-switch on the gas pedal.. I know.. I know.. what was I thinking
An hour or so later, they called my number for first round time trials and I hopped in the car and was all excited to break new ET's and MPH...
I crank over the motor and KABOOOOM !!! people 6 rows away ducked for cover.. The ol nitrous back fire..
Well.... we needed to put all the rubber vacuum lines back on the carb and then decided to fire it up to see if there was any damage.. the motor fired right up, but shot up to 3500 rpm.. Turned off the motor and looked everything over once again.. turned on the fuel pump, no fuel running down the carb.. so we fired it back up... right up to 3500 rpm and fuel was gushin into the secondaries..
Decided to miss the 1st round and pull off the carb and to my surprise, the backfire bent both butterflies on the secondary almost a good 70 degrees pointing upward... which explains why the motor raced to 3500 rpm...
We flattened them back out and the motor seems to have survived without any issues.. However this was sooooo freak, I thought I would share it with you guys...
You guys need to know this stuff is NASTY and to treat it with a lot of respect. You could have hurt yourself or somebody else. It will lay in a manifold for a long time and this is exactly what happens.
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Re: Kabooom... back fire thru carb
[Re: S/ST 3040]
#441621
08/17/09 11:26 PM
08/17/09 11:26 PM
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Joined: Dec 2004
Posts: 1,256
Salisbury North Carolina
8secDart
pro stock
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pro stock
Joined: Dec 2004
Posts: 1,256
Salisbury North Carolina
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Quote:
That ought to teach you...........now get that crap off of
there and do it the right way.
What is the right way,go slow.Give me a break.Not everyone is 90 years old on here.
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Re: Kabooom... back fire thru carb
[Re: 70dusterjohn]
#441623
08/18/09 03:37 AM
08/18/09 03:37 AM
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Joined: Jul 2003
Posts: 12,129
Cleveland
sunroofgtx
I Live Here
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I Live Here
Joined: Jul 2003
Posts: 12,129
Cleveland
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Wow Don. Glad that was it for the problem. That laughing gas is some dangerous stuff. Good luck , bud..
Join the quickest team in motorsports. Team FireCore. CustomWiresets.com
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Re: Kabooom... back fire thru carb
[Re: sunroofgtx]
#441624
08/18/09 07:58 AM
08/18/09 07:58 AM
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Joined: Jan 2003
Posts: 8,022
Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,022
Tulsa OK
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A friend of mine had a pretty severe backfire in his stang years ago and it did lots of damage. A solenoid hung open in the shutdown area and it died, so he went to fire it up on the return road and BOOM. Hood, intake, throttle body, ring lands on the pistons were all done for.
I have done the same thing as you have, but mine bent the primary blades and I never could get it to idle right again so I had to get a new baseplate.
68 Barracuda Formula S 340
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Re: Kabooom... back fire thru carb
[Re: Jeepmon]
#441625
08/18/09 08:30 AM
08/18/09 08:30 AM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Quote:
I thought I would share this with you since its something I have never seen, heard about or ever experienced..
Being a skool boy learning this nitrous stuff.. I made a silly little error that could have been quite costly.. Luckily, the motor seems to be ok..
In the pits this last weekend, we hooked up the bottle, put the warmer on it and got it up to temp.. For some dumb reason, I decided to purge it by using the micro-switch on the gas pedal.. I know.. I know.. what was I thinking
An hour or so later, they called my number for first round time trials and I hopped in the car and was all excited to break new ET's and MPH...
I crank over the motor and KABOOOOM !!! people 6 rows away ducked for cover.. The ol nitrous back fire..
Well.... we needed to put all the rubber vacuum lines back on the carb and then decided to fire it up to see if there was any damage.. the motor fired right up, but shot up to 3500 rpm.. Turned off the motor and looked everything over once again.. turned on the fuel pump, no fuel running down the carb.. so we fired it back up... right up to 3500 rpm and fuel was gushin into the secondaries..
Decided to miss the 1st round and pull off the carb and to my surprise, the backfire bent both butterflies on the secondary almost a good 70 degrees pointing upward... which explains why the motor raced to 3500 rpm...
We flattened them back out and the motor seems to have survived without any issues.. However this was sooooo freak, I thought I would share it with you guys...
Wow
Dont feel bad, you know 100% more than me about NOS, but someday I plan to run it..So its safe to say not to purge the line through the engine at all correct?
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Kabooom... back fire thru carb
[Re: maximum entropy]
#441628
08/18/09 12:15 PM
08/18/09 12:15 PM
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Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
S/ST 3040
master
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master
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
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Quote:
Quote:
Quote:
Not everyone is 90 years old on here.
Then, hopefully most of us still have a sense of humor.
yeah. slow like the cuda in your sig pic. what a turd. 
It is a pile. 
10.74 @ 124.73
OEM heads, stock stroke 340, flat tappet, 727......... 
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Re: Kabooom... back fire thru carb
[Re: S/ST 3040]
#441629
08/18/09 12:27 PM
08/18/09 12:27 PM
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Joined: Jul 2004
Posts: 323
Maryland
Bill_G
enthusiast
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enthusiast
Joined: Jul 2004
Posts: 323
Maryland
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Just went through this with a friend we put the spring loaded pressure relief valve on his SM tunnel ram, get one of these it will save you money in the long run!
Bill
1970 Charger R/T
1970 Dart Swinger 340/4spd
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Re: Kabooom... back fire thru carb
[Re: Bill_G]
#441630
08/18/09 12:46 PM
08/18/09 12:46 PM
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Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
Jeepmon
OP
master
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OP
master
Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
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Quote:
Just went through this with a friend we put the spring loaded pressure relief valve on his SM tunnel ram, get one of these it will save you money in the long run!
Bill
What the heck is that and how does it work?
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Thats crazy force behind those NOS booms... 
