Post your stories/results from Detonating/Pre-Igniting on a big shot! - LS1TECH



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

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Old 11-18-2007, 02:50 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, 03:36 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






I got a feeling compression was down on number eight
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Old 11-18-2007, 09:02 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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Old 11-18-2007, 09:57 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






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, 10:03 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, 10:44 AM   #6
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Quote:
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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, 02:43 AM   #7
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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, 10:14 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, 10:37 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, 12:21 PM   #10
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Quote:
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We were running 104UL and spraying through a .082 N2O jet
thanks man!
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Old 11-19-2007, 01:14 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, 11:19 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, 02:42 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, 10:06 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.
Robert
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Old 11-20-2007, 11:35 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, 11:42 PM   #16
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A few more...





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Old 11-21-2007, 01:50 AM   #17
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damn.... you win. that is some major carnage!
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Old 11-21-2007, 11:08 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, 11:53 AM   #19
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hahah The heads were salvageable that was about it
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Old 11-21-2007, 12:40 PM   #20
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some light reading...

http://www.yellowbullet.com/forum/showthread.php?t=3151
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