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Post your stories/results from Detonating/Pre-Igniting on a big shot!

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Old 11-18-2007, 01:50 AM   #1
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Default Post your stories/results from Detonating/Pre-Igniting on a big shot!

After reading Dave's post about the 28 degrees of timing and fuel pump with stock rods on a 300 shot detonating and bending the rod, I became curious..... what kind of damage have yall seen on big shots of nitrous with detonation or pre-igniting the cylinder?

I assume the list will include:

Lifted Heads
Broken Ringlands
Bent Valves
Burnt plugs
Backfires??
Lost compression

What happened to you?
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Old 11-18-2007, 02:36 AM   #2
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Never detonated but got a little Lean
Melted number 8 plug down. Rejetted number eight and made a dozen or so more passes. I thought I was lifting a head gasket because it would push coolant out durring each run. I ran 10.oh and dyno'd over 600RWHP like this


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I got a feeling compression was down on number eight
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Old 11-18-2007, 08:02 AM   #3
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Quote:
Originally Posted by TwoFast4Lv View Post
Never detonated but got a little Lean
Melted number 8 plug down. Rejetted number eight and made a dozen or so more passes. I thought I was lifting a head gasket because it would push coolant out durring each run. I ran 10.oh and dyno'd over 600RWHP like this


I got a feeling compression was down on number eight

that is a good start... thanks for the contribution!
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2000 WS6
6.19 @110mph N2O (1.39 60ft) / 7.12 @ 97mph NA --- Looking to go faster with a turbo or two + 408ci = lots of fun
http://408ws6transam.googlepages.com/home
2005 Pontiac GTO M6 another motor, intake, and a 224/224 cam
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Old 11-18-2007, 08:57 AM   #4
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Quote:
Originally Posted by TwoFast4Lv View Post
Never detonated but got a little Lean
Melted number 8 plug down. Rejetted number eight and made a dozen or so more passes. I thought I was lifting a head gasket because it would push coolant out durring each run. I ran 10.oh and dyno'd over 600RWHP like this


Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

I got a feeling compression was down on number eight
Ellis, looks like a little detonation to me; the piston tops look sand blasted a tell tale sign? Or is this just the pic?
Robert
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Old 11-18-2007, 09:03 AM   #5
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I melted 6 of my plugs and burned 2 valves when I got greedy with the timing on a 200 shot. The porcilin came off the tip of one of the plugs and got chewed up between the head and piston.
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Old 11-18-2007, 09:44 AM   #6
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Quote:
Originally Posted by Robert56 View Post
Ellis, looks like a little detonation to me; the piston tops look sand blasted a tell tale sign? Or is this just the pic?
Robert
Nope it is just the flash on the pic's. My $100 E-bay shop camera LOL.

The pistons looked great once we cleaned them up. HOPEFULLY this will clean up the high end miss I was getting. I have yet to put it through the last 200ft on juice with out breaking up. At one point we were down to 10* and below 10 ARF

i was SO glad I took the NGKs out and went to the Autolite racing plugs!
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Old 11-19-2007, 01:43 AM   #7
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Quote:
Originally Posted by TwoFast4Lv View Post
Nope it is just the flash on the pic's. My $100 E-bay shop camera LOL.

The pistons looked great once we cleaned them up. HOPEFULLY this will clean up the high end miss I was getting. I have yet to put it through the last 200ft on juice with out breaking up. At one point we were down to 10* and below 10 ARF

i was SO glad I took the NGKs out and went to the Autolite racing plugs!
what size shot wher you spraying and what oct were you on?
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Old 11-19-2007, 09:14 AM   #8
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Never had any experience with detonating/pre-ignition but I had a backfire once that blue a flame out of the corner of my hood, fried my MAF, and blew apart my CAI.
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Old 11-19-2007, 09:37 AM   #9
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what size shot wher you spraying and what oct were you on?
We were running 104UL and spraying through a .082 N2O jet
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Old 11-19-2007, 11:21 AM   #10
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Quote:
Originally Posted by TwoFast4Lv View Post
We were running 104UL and spraying through a .082 N2O jet
thanks man!
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Old 11-19-2007, 12:14 PM   #11
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melted a few dozen plugs getting greedy on nitrous and not reflashing my nitrous tunes. i have a ground strap off number 3 permanently embedded in my piston to remind me not to be an idiot
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Old 11-19-2007, 10:19 PM   #12
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I was trying to make it to thunder a few years back and got in a hurry with my car. I had a bad voltage to the injectors and on a 400 shot it was not pretty. I busted the block,took out number 6 and 8 piston and hurt the head. I felt like crying.
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Old 11-20-2007, 01:42 AM   #13
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That reminds me I need to drop a set of '9s' back in for the dyno this weekend.

Robert better be ready to go over 700RWHP. . I will be
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Old 11-20-2007, 09:06 PM   #14
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Quote:
Originally Posted by TwoFast4Lv View Post
That reminds me I need to drop a set of '9s' back in for the dyno this weekend.

Robert better be ready to go over 700RWHP. . I will be
Hehe, more than ready. I'll blow that **** up if I have to, lol.
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Old 11-20-2007, 10:35 PM   #15
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Fuel pump **** the bed, was a really quick end of the season install, no fpss and this was the result...

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Old 11-20-2007, 10:42 PM   #16
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A few more...


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Old 11-21-2007, 12:50 AM   #17
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damn.... you win. that is some major carnage!
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http://408ws6transam.googlepages.com/home
2005 Pontiac GTO M6 another motor, intake, and a 224/224 cam
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Old 11-21-2007, 10:08 AM   #18
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fill in those holes with some JB-weld, & some of those piston rings can be straightened back out.
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Old 11-21-2007, 10:53 AM   #19
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hahah The heads were salvageable that was about it
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Old 11-21-2007, 11:40 AM   #20
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some light reading...

http://www.yellowbullet.com/forum/showthread.php?t=3151
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Old 11-21-2007, 11:40 AM
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