Sounds like audible pinging, but no KR?
10-20-2002, 02:47 PM
#1
Sounds like audible pinging, but no KR? Anyone have any idea what this could be?
No KR with several passes on Autotap, but sounds like audible pinging under hard acceleration.
Could it be internal? Maybe a loose rocker arm? Or is it more likely my belt or something?
No KR with several passes on Autotap, but sounds like audible pinging under hard acceleration.
Could it be internal? Maybe a loose rocker arm? Or is it more likely my belt or something?
10-21-2002, 09:47 AM
#3
Re: Sounds like audible pinging, but no KR? I have LS1 Edit Jason, and the knock stuff is all set to stock. I am running total timing at 26 degrees with zero knock and about 11.1:1 CR. Can't figure out what's making the knocking sound <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />
Todd
Todd
10-21-2002, 02:03 PM
#4
Re: Sounds like audible pinging, but no KR? This is a silly one, but I figured I would throw it in there.
I was getting what sounded like detonation at higher rpms (like somebody had just thrown in a bag of marbles) with no KR, no loss in time....nothing. I couldn't figure out what it was.
It turned out to be my tranny. I grabbed it one day during a high speed run, and could "feel" the noise.... <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />
I guess something is wearing out with my tranny tolerances, and it now makes this noise at higher RPMs. It sounds alot like detonation.
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
I was getting what sounded like detonation at higher rpms (like somebody had just thrown in a bag of marbles) with no KR, no loss in time....nothing. I couldn't figure out what it was.
It turned out to be my tranny. I grabbed it one day during a high speed run, and could "feel" the noise.... <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />
I guess something is wearing out with my tranny tolerances, and it now makes this noise at higher RPMs. It sounds alot like detonation.
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
10-21-2002, 02:20 PM
#5
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Re: Sounds like audible pinging, but no KR? I just replaced my tranny mount on Saturday, and a lot of vibration & noise went away. It didn'te really sound much like pinging, though.
10-21-2002, 04:12 PM
#6
Re: Sounds like audible pinging, but no KR? I am also suspecting the tranny. It's a Th350 and I have been getting lots of vibration from down there lately. Think the tranny is about o crap on me <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
Todd
Todd
10-21-2002, 04:45 PM
#7
Re: Sounds like audible pinging, but no KR? I learned the hard way that if it is pinging it probably is detonation even if ATAP shows no KR!
When I had my SC I thought I heard the pinging, but ATAP showed no knock retard, so I didn't get off the gas on my test runs. Goodbye head gasket & ringlands. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
I'd cut your timing or boost, or increase your octane and see if it goes away.
When I had my SC I thought I heard the pinging, but ATAP showed no knock retard, so I didn't get off the gas on my test runs. Goodbye head gasket & ringlands. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
I'd cut your timing or boost, or increase your octane and see if it goes away.
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10-21-2002, 06:09 PM
#8
Re: Sounds like audible pinging, but no KR? 11.1:1 compression, 94 octane, 50 degrees outside, only 26 degrees of timing = knock?
I have a hard time believing it's knock...been running this combo for a few months now with no issues. Just started up in the last few days.
Todd
I have a hard time believing it's knock...been running this combo for a few months now with no issues. Just started up in the last few days.
Todd
10-21-2002, 10:23 PM
#9
Re: Sounds like audible pinging, but no KR? bad tank of gas?? operating temps increased??
Its simple test if you have edit to reduce the high octane table 5 degrees, test it, and then either restore it or dial it in. I'm guess I'm just a bit nervous when I hear knock now. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Its simple test if you have edit to reduce the high octane table 5 degrees, test it, and then either restore it or dial it in. I'm guess I'm just a bit nervous when I hear knock now. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
10-22-2002, 02:09 PM
#11
LS1Tech Co-Founder
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Re: Sounds like audible pinging, but no KR? Simple experiment.
Using your LS1 Edit, reduce the timing.
Does it still make the noise?
I drove a H/C M6 car that had audible detonation at part throttle right when I would get into it... it needed more fuel.
Using your LS1 Edit, reduce the timing.
Does it still make the noise?
I drove a H/C M6 car that had audible detonation at part throttle right when I would get into it... it needed more fuel.