Pinging noise, possible spark knock? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

383Chevy · 04-23-2011, 01:01 PM

Theres this really annoying pinging noise, it happened even before i put my new cam in, i can cruise and wont hear it but i have a 383 so like to "get on it" and when i do soon as it shifts into 2nd gear i get this pinging/rattling noise and i know it is NOT and rod knock im being told its a spark knock anyway its annoying as all hell and im not sure how to get rid of it i mean **** im runnin 93 octane too. Any help would be appreciated

**PRattenbury** · 04-23-2011, 01:54 PM

Use a cooler heat range plug. Go down one range. If it seems to help but not all the way, drop another one (don't go more than 2 heat ranges cooler on the plugs). Use 93 octane gas. Make sure you're not running too lean. And if all that fails, try retarding your timing a bit. If it still pings after all that, get used to the ping. Your compression ratio is probably too high for pump gas.

383Chevy · 04-23-2011, 02:08 PM

Quote:

Originally Posted by PRattenbury

Use a cooler heat range plug. Go down one range. If it seems to help but not all the way, drop another one (don't go more than 2 heat ranges cooler on the plugs). Use 93 octane gas. Make sure you're not running too lean. And if all that fails, try retarding your timing a bit. If it still pings after all that, get used to the ping. Your compression ratio is probably too high for pump gas.

Never thought about the plugs, i will try that and the carb prolly is running a lil too lean thanks

cableguy0 · 04-23-2011, 03:31 PM

Need more info.. What is the compression ratio? WHat are the engine specs? Where is your timing set? What kind of carb and what size is it?

85Bowtie · 04-23-2011, 09:04 PM

What heads, pistons and head gaskets are you using? How far in the bore are the pistons? Your problem may not be compression, but instead lack of quench. Many people mistake pinging to be related to having too much compression when most times it's too much heat soaked into the combustion chamber. A higher octane fuel could help resist the extra heat, but that doesn't mean your compression is causing the problem.

mooseknuckles · 04-23-2011, 09:50 PM

check timing!

Blue Chevy 1987 · 04-25-2011, 09:17 AM

could be a headstud or pushroad, rocker arm

BigBlocksRule · 04-25-2011, 09:26 AM

Double check vacuum advance on your dizzy, too. If you're running the same carb with the same settings you had with a 350, you're probably running lean when you get on it.
Get it fixed, detonation tears up more engines than all other causes!

04-23-2011, 01:01 PM	#1
383Chevy [><]Sofa King Dirty 4x4[><] Join Date: Jul 2009 Location: Englewood, Fl Posts: 353	Pinging noise, possible spark knock? Theres this really annoying pinging noise, it happened even before i put my new cam in, i can cruise and wont hear it but i have a 383 so like to "get on it" and when i do soon as it shifts into 2nd gear i get this pinging/rattling noise and i know it is NOT and rod knock im being told its a spark knock anyway its annoying as all hell and im not sure how to get rid of it i mean ** im runnin 93 octane too. Any help would be appreciated __________________ 00' Chevy Silverado 1500 z71 33"s 3" lift 5-speed Past trucks** 85' Chevy C10 Step side 388 stroker 33" bfg a/t's holley 670cfm world product heads 14.80@92mph 92' S10/Tahoe sbc swap

04-23-2011, 01:54 PM	#2
PRattenbury Senior Member Join Date: Feb 2010 Location: Maumelle, AR Posts: 478	Re: Pinging noise, possible spark knock? Use a cooler heat range plug. Go down one range. If it seems to help but not all the way, drop another one (don't go more than 2 heat ranges cooler on the plugs). Use 93 octane gas. Make sure you're not running too lean. And if all that fails, try retarding your timing a bit. If it still pings after all that, get used to the ping. Your compression ratio is probably too high for pump gas.

04-23-2011, 03:31 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Pinging noise, possible spark knock? Need more info.. What is the compression ratio? WHat are the engine specs? Where is your timing set? What kind of carb and what size is it? __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. Last edited by cableguy0; 04-23-2011 at 03:32 PM.

04-23-2011, 09:04 PM	#5
85Bowtie Registered User Join Date: Mar 2009 Location: TN Posts: 410	Re: Pinging noise, possible spark knock? What heads, pistons and head gaskets are you using? How far in the bore are the pistons? Your problem may not be compression, but instead lack of quench. Many people mistake pinging to be related to having too much compression when most times it's too much heat soaked into the combustion chamber. A higher octane fuel could help resist the extra heat, but that doesn't mean your compression is causing the problem. __________________ '69 Dodge Charger R/T 440, 727, 3.55 Sure Grip '68 Plymouth Road Runner 383, 727, 3.23 Sure Grip '89 Dodge Diplomat ex cop car 408, 727, 3.55 Sure Grip '77 Dodge Monaco ex cop car 440, 727, 2.71 '79 Dodge 'Lil Red Express pickup 360, 727, 3.55 Sure Grip '12 Dodge Challenger SRT8 392, M6, 3.92 '85 Chevrolet C-10 SWB 2wd 305, TH350, 2.73

04-23-2011, 09:50 PM	#6
mooseknuckles Registered User Join Date: Sep 2009 Location: ottawa,canada Posts: 4,550	Re: Pinging noise, possible spark knock? check timing! __________________ my build threads '86 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415628 '67 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=635078 '63 GMC http://67-72chevytrucks.com/vboard/s...d.php?t=674682

04-25-2011, 09:17 AM	#7
Blue Chevy 1987 Registered User Join Date: Aug 2010 Location: Virginia Beach, VA Posts: 64	Re: Pinging noise, possible spark knock? could be a headstud or pushroad, rocker arm

04-25-2011, 09:26 AM	#8
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: Pinging noise, possible spark knock? Double check vacuum advance on your dizzy, too. If you're running the same carb with the same settings you had with a 350, you're probably running lean when you get on it. Get it fixed, detonation tears up more engines than all other causes!

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