Identifying ping (detonation) with loud exhaust - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mrturner1 · 04-11-2016, 02:21 PM

Hey guys so I'm still tuning my truck in and I'm wondering how to identify ping when you have loud exhaust. Also wondering if timing will change the sound of your exhaust. My exhaust is fairly loud I have a long tubes and flow masters dumped, and I noticed that when changing the timing it sounds different under acceleration and it made it kind of flappy when I rev or drive it. When I gave it a little more timing is when it seemed to make the exhaust sound flappy and there was a slight noise under acceleration but I can't tell if it's ping or not because under light acceleration or hard acceleration flow masters make a lot of noise and some of it is kind of like the high pitch tone of a ping. Another thing I noticed when I gave it a little more timing the RPMs didn't drop when I put it in gear as bad, maybe only 200 RPM a set of 400 like it was before.

Let me know what you think guys. I've been playing with everything from 32 total to 38. It's a 9.5-1 or 10-1 SBC with a Comp 280H, 67cc RHS heads and edelbrock rpm intake and 650 AVS carb, GM HEI

MMcMasters · 04-11-2016, 03:54 PM

You can read the plugs to see if there is any indication of detonation. You will see little black specks on the porcelain. This is a sign of detonation. If the specks appear to be shiny or sparkle, then this is a sign of severe detonation and the shiny pieces are actually pieces of the piston.

It's not as simple as this but this is a good tool if you suspect your tune up may be off.

Here is a very good article and well worth the read:

http://www.chevelles.com/forums/13-p...ion-101-a.html

Mike

**jeffahart** · 04-11-2016, 07:34 PM

I think you would be able to here it. Even as subtle as it might be under the exhaust noise, it is a different noise, it's that rattling pop corn popper type clatter... pinging. And if it's bad enough you may even feel it in the pedal. The flappy seems like the timing. In tune it will purr. So at this point you are not solving for detonation, you just think you might be. But I think you would here it.

04-11-2016, 02:21 PM	#1
Mrturner1 Registered User Join Date: Nov 2015 Location: Colfax California Posts: 1,644	Identifying ping (detonation) with loud exhaust Hey guys so I'm still tuning my truck in and I'm wondering how to identify ping when you have loud exhaust. Also wondering if timing will change the sound of your exhaust. My exhaust is fairly loud I have a long tubes and flow masters dumped, and I noticed that when changing the timing it sounds different under acceleration and it made it kind of flappy when I rev or drive it. When I gave it a little more timing is when it seemed to make the exhaust sound flappy and there was a slight noise under acceleration but I can't tell if it's ping or not because under light acceleration or hard acceleration flow masters make a lot of noise and some of it is kind of like the high pitch tone of a ping. Another thing I noticed when I gave it a little more timing the RPMs didn't drop when I put it in gear as bad, maybe only 200 RPM a set of 400 like it was before. Let me know what you think guys. I've been playing with everything from 32 total to 38. It's a 9.5-1 or 10-1 SBC with a Comp 280H, 67cc RHS heads and edelbrock rpm intake and 650 AVS carb, GM HEI

04-11-2016, 03:54 PM	#2
MMcMasters Registered User Join Date: Dec 2012 Location: Rochester, IL Posts: 537	Re: Identifying ping (detonation) with loud exhaust You can read the plugs to see if there is any indication of detonation. You will see little black specks on the porcelain. This is a sign of detonation. If the specks appear to be shiny or sparkle, then this is a sign of severe detonation and the shiny pieces are actually pieces of the piston. It's not as simple as this but this is a good tool if you suspect your tune up may be off. Here is a very good article and well worth the read: http://www.chevelles.com/forums/13-p...ion-101-a.html Mike

04-11-2016, 07:34 PM	#3
jeffahart Senior Member Join Date: May 2012 Location: Scottsdale, AZ Posts: 1,907	Re: Identifying ping (detonation) with loud exhaust I think you would be able to here it. Even as subtle as it might be under the exhaust noise, it is a different noise, it's that rattling pop corn popper type clatter... pinging. And if it's bad enough you may even feel it in the pedal. The flappy seems like the timing. In tune it will purr. So at this point you are not solving for detonation, you just think you might be. But I think you would here it. __________________ White K20



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