Nitrous backfire

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Jan 19, 2014 | 10:53 PM

06blcksierra

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Nitrous backfire

Had a pretty decent size nitrous backfire while making a test hit on my 5.3 swap camaro. It sounded fine after it happened until about 1 more block and it started knocking pretty loud. Its not down on power and there is no metal in the oil, all the rockers checked out and so did the springs. Just looking for advice on where to look next. Any help will be great. It was on a 175 shot.

Jan 19, 2014 | 11:40 PM

adamcs

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From: charleston, sc

You already pull all the plugs out and check them? If not start there

Jan 20, 2014 | 01:26 AM

06blcksierra

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Yes it melted #3 plug, just the strap. Replaced with a new one and still no change. No blow by or anything. Would it be possible for a lifter to have collapsed?

Jan 20, 2014 | 01:31 AM

brandon6.0

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From: Glennville, GA.

Check compression on that cylinder, better yet maybe all of them.

Also check pushrod, valves, or springs.

Jan 20, 2014 | 10:19 AM

06blcksierra

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Planning on checking the compression this weekend. Pushrods where good. Springs appeared to be fine. Thank you for the pointers!

Jan 20, 2014 | 11:32 AM

brandon@nitrousoutlet

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From: Waco, TX

What made it backfire?

Jan 20, 2014 | 01:19 PM

06blcksierra

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Honestly I have no clue. Running a good tune and I was on race gas just to be safe. I bought the kit through nitrous outlet so I know its a good kit. Was a good solid run and right after it shifted into 3rd all hell broke loose lol. Car doesn't smoke, doesn't run bad its just knocking pretty loud. Doesn't seem to be any blow by. I didn't get a decent log that run so I have no clue what it could be

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Jan 20, 2014 | 02:25 PM

brandon@nitrousoutlet

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From: Waco, TX

Any idea of how much timing you had in it? Air/Fuel ratio? What plugs were you running? How big of a shot?

Jan 21, 2014 | 12:52 PM

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87silverbullet

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From: Slidell,LA

Quote:

Originally Posted by 06blcksierra

I said the same thing and ended up with 4 spun bearings and a bent crank.

Jan 22, 2014 | 10:28 AM

#11

ATVracr

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From: GB

Quote:

Originally Posted by shortdog

Not a good tune if you melted a plug. I bet too much timing.

What I was thinking, Probably wrong plugs also.

Once you melt the plug it can lite off random like a glow plug, cause random backfire.

Jan 22, 2014 | 07:50 PM

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boostit5.3

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what plugs?

Feb 10, 2014 | 08:36 PM

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06blcksierra

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I believe the plug was br7? I'll have to look. Sorry about the delay. I got the motor tore down and only thing that was hurt was a few lifters. I guess you can think a unknown mileage junk yard motor for that. Lol. It got me into the low 11s so it hasn't been too bad. I think it'll be up and running next month with a better tune for sure. Thanks guys