can detonation destroy one piston and not the others.
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From: Carlisle, PA, usa
can detonation destroy one piston and not the others.
Here’s the story. Some local guy wanted me to install an intake manifold for him and he told me how crappy his car ran and it was loosing oil like crazy. He was telling me how the two local shop ripped him off. The one shop charged him like $6000 for a b20vtec setup (nothing special, just a used b20 block with a used gsr head). They gave him the car when they knew it was running 19:1 air fuel ratio. It blew up 1000 miles later and they told him to **** off. He then went a bought a gsr short block with ctr pistons in it. The second shop took the gsr head from the old b20vtec and put it on the gsr short block with ctr pistons. They put RC 310cc injectors on it and tuned it with a vafc. The vafc settings were –30 at most of the rpm range and the distributor was set at –3 degree. He said the shop dyno tuned it and he thinks it made low power for the setup.
I told him that the injectors were too big and it’s not good to set the vafc at –30, and he should get a chipped p28 and I can tune it for him with uber. After he got the chipped p28 and brought me the car, I turned the distributor back to 16 deg and set the ignition back by 5 degree across the board with uber, and told him to leave it there until we get it dyno tune next week. We couldn’t schedule to dyno with in a week, so my friend came over several days later and we street tune the car with wideband. The car ran good with no sign of detonation, I even pull the plugs and checked. The next day, he brought the car over and said it was running really shitty and burning oil bad. So I pull all the plugs to do a compression check and saw that #3 plug was completely fouled out with carbon and oil, the other plugs looked perfect. Compression came out to 275-45-275-240 from cyl 4-1. So he went back to the second shop to have an ls put in and they took the old engine apart. They told him that #3 was completely detonated and the corners of the pistons were completely gone. Is it possible for detonation to occur in just one cylinder and not the rest. I know cyl 3 usually run a little hot but to completely destroy one cylinder in several days and the rest of the other pistons were fine. I told him to send me pictures or let me look at the block.
I told him that the injectors were too big and it’s not good to set the vafc at –30, and he should get a chipped p28 and I can tune it for him with uber. After he got the chipped p28 and brought me the car, I turned the distributor back to 16 deg and set the ignition back by 5 degree across the board with uber, and told him to leave it there until we get it dyno tune next week. We couldn’t schedule to dyno with in a week, so my friend came over several days later and we street tune the car with wideband. The car ran good with no sign of detonation, I even pull the plugs and checked. The next day, he brought the car over and said it was running really shitty and burning oil bad. So I pull all the plugs to do a compression check and saw that #3 plug was completely fouled out with carbon and oil, the other plugs looked perfect. Compression came out to 275-45-275-240 from cyl 4-1. So he went back to the second shop to have an ls put in and they took the old engine apart. They told him that #3 was completely detonated and the corners of the pistons were completely gone. Is it possible for detonation to occur in just one cylinder and not the rest. I know cyl 3 usually run a little hot but to completely destroy one cylinder in several days and the rest of the other pistons were fine. I told him to send me pictures or let me look at the block.
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From: Carlisle, PA, usa
Re: can detonation destroy one piston and not the others. (skunked)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by skunked »</TD></TR><TR><TD CLASS="quote">Injector fail?</TD></TR></TABLE>
never thought about that.
it makes sense now, it could have been his wire harness. his harness under the dash was completely melted together because he wired fog light directly to the power antena wire without a relay. the horn wasn't working, so i seperated all the melted wire trying to fix the horn and all his lights got screwed up. his brake lights wasn't working and the driver side head lights were very dim and the parking lights were always on.
Modified by rice4life at 12:42 PM 3/16/2005
never thought about that.
it makes sense now, it could have been his wire harness. his harness under the dash was completely melted together because he wired fog light directly to the power antena wire without a relay. the horn wasn't working, so i seperated all the melted wire trying to fix the horn and all his lights got screwed up. his brake lights wasn't working and the driver side head lights were very dim and the parking lights were always on.
Modified by rice4life at 12:42 PM 3/16/2005
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From: los banos, ca
Re: can detonation destroy one piston and not the others. (rice4life)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rice4life »</TD></TR><TR><TD CLASS="quote">
never thought about that.
it makes sense now, it could have been his wire harness. his harness under the dash was completely melted together because he wired fog light directly to the power antena wire without a relay. the horn wasn't working, so i seperated all the melted wire trying to fix the horn and all his lights got screwed up. his brake lights wasn't working and the driver side head lights were very dim and the parking lights were always on.
Modified by rice4life at 12:42 PM 3/16/2005</TD></TR></TABLE>
now that was worth reading LOL toooo funny....
never thought about that.
it makes sense now, it could have been his wire harness. his harness under the dash was completely melted together because he wired fog light directly to the power antena wire without a relay. the horn wasn't working, so i seperated all the melted wire trying to fix the horn and all his lights got screwed up. his brake lights wasn't working and the driver side head lights were very dim and the parking lights were always on.
Modified by rice4life at 12:42 PM 3/16/2005</TD></TR></TABLE>
now that was worth reading LOL toooo funny....
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From: NOR CAL
Re: can detonation destroy one piston and not the others. (rice4life)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rice4life »</TD></TR><TR><TD CLASS="quote">
never thought about that.
it makes sense now, it could have been his wire harness. his harness under the dash was completely melted together because he wired fog light directly to the power antena wire without a relay. the horn wasn't working, so i seperated all the melted wire trying to fix the horn and all his lights got screwed up. his brake lights wasn't working and the driver side head lights were very dim and the parking lights were always on.
Modified by rice4life at 12:42 PM 3/16/2005</TD></TR></TABLE>
Pull all the injectors out of the rail and see if they spray....It could be electrical or maybe a clogged or failed injector.
never thought about that.
it makes sense now, it could have been his wire harness. his harness under the dash was completely melted together because he wired fog light directly to the power antena wire without a relay. the horn wasn't working, so i seperated all the melted wire trying to fix the horn and all his lights got screwed up. his brake lights wasn't working and the driver side head lights were very dim and the parking lights were always on.
Modified by rice4life at 12:42 PM 3/16/2005</TD></TR></TABLE>
Pull all the injectors out of the rail and see if they spray....It could be electrical or maybe a clogged or failed injector.
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