Pinging Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mikajo39 · 10-24-2009, 07:14 PM

Ok here's my dilemma my engine seems to ping pretty bad on the drivers side only(350) at part throttle, even with vacuum advance disconnected. It has 9.5-1 compression with iron heads. I have to back the timing off to where it doesn't ping for me to drive it and when its backed off that far the timing is too retarded and I get full throttle stumbles. It'll ping when cold too. I've tried different advance springs, when it runs good ( no stumbles) the timing is 34 deg all out at 3200 rpm but It will ping on the freeway. Should I try a colder plug? Or could my jetting be too lean and making it ping? I'm pretty frustrated with this blasted thing, it's new and I can't even have fun with it without problems.

**leddzepp** · 10-24-2009, 07:43 PM

What octane fuel are you running? Cheap gas can cause pinging. With that compression, I would be running 91 in it.

mikajo39 · 10-24-2009, 07:56 PM

Oops knew I forgot something, I'm running 91 best I can get here in cali. Usually buy from the 76 or chevron no cheapy gas is used.

dwcsr · 10-24-2009, 07:58 PM

Could be several things or all the things I mention.

To hot a plug, high zinc/lithium oil ( Diesel oil) and worn valve guides or a lot of blow by in the engine. The zinc gets into the cylinders and you get hot spots and pinging. Use an oil that is for later model engines not the high Zinc oil, run a R43TS (colder) plug and 93 octane gas, Set your timing at 6-8 BTDC. Thats the only way I got mine to stop pinging and run decent. My other option is a rebuild to stop the blow by and fix the guides.

**leddzepp** · 10-24-2009, 08:01 PM

I figured with your detailed post that you were running 91, but had to ask

Too bad 91 is the best we can get here

mikajo39 · 10-24-2009, 08:04 PM

Quote:

Originally Posted by leddzepp

I figured with your detailed post that you were running 91, but had to ask

Too bad 91 is the best we can get here

Yeah really, there's a VP racing fuels bout 20 miles from me but I can't afford 7 dollars a gallon

mikajo39 · 10-24-2009, 08:05 PM

Quote:

Originally Posted by dwcsr

Could be several things or all the things I mention.

To hot a plug, high zinc/lithium oil ( Diesel oil) and worn valve guides or a lot of blow by in the engine. The zinc gets into the cylinders and you get hot spots and pinging. Use an oil that is for later model engines not the high Zinc oil, run a R43TS (colder) plug and 93 octane gas, Set your timing at 6-8 BTDC. Thats the only way I got mine to stop pinging and run decent. My other option is a rebuild to stop the blow by and fix the guides.

Well this engine is brand new and has less than 500 miles on it so I'm pretty sure everything is still nice on the inside, oil looks like gold, and I still have to change it in about 100 miles when it's break in period is done.

silverstreak · 10-24-2009, 09:02 PM

Running lean can make it ping as well. What type / size carb are you running? Does it do it at WOT also?

mikajo39 · 10-25-2009, 12:02 AM

Quote:

Originally Posted by silverstreak

Running lean can make it ping as well. What type / size carb are you running? Does it do it at WOT also?

edelbrock performer 600 It only pings at part throttle WOT is all good

silverstreak · 10-25-2009, 08:52 AM

OK, Edelbrock makes a few different versions of the 600. Look on the front of the carb just below the passenger side front mounting ear where it bolts to the intake. The part number should be stamped there. The two most common versions are the 1405 and 1406. The 1406 is calibrated for a near stock engine and is lean calibrated for fuel economy. The 1405 is calibrated richer for a performance engine. If you're pushing 400hp you probably need the 1405, however if you have the 1406, it can be calibrated richer.

Here's what I would do. Buy or borrow an air fuel ratio monitor.
http://www.summitracing.com/parts/EDL-6593/?image=large
and see where the AFR is at part throttle.
If it's indicating lean at that point, you can use a calibration kit http://www.summitracing.com/parts/EDL-1487/?image=large to richen the carb at part throttle with the various jets, metering rods and step up springs.
Here are some links to tuning the Edelbrock carbs:
http://www.carcraft.com/techarticles...ing/index.html
http://www.telusplanet.net/public/gi.../section_2.htm

mikajo39 · 10-25-2009, 10:30 AM

Well I'm over 400hp. I know I have the one tuned for performance, the 1405. I'll have to take it into shop class we have A/F gauges there. I think my next step is colder plugs and jetting it up

10-24-2009, 07:14 PM	#1
mikajo39 Gearhead and audio junkie Join Date: Aug 2008 Location: nunyah Posts: 452	Pinging Problems Ok here's my dilemma my engine seems to ping pretty bad on the drivers side only(350) at part throttle, even with vacuum advance disconnected. It has 9.5-1 compression with iron heads. I have to back the timing off to where it doesn't ping for me to drive it and when its backed off that far the timing is too retarded and I get full throttle stumbles. It'll ping when cold too. I've tried different advance springs, when it runs good ( no stumbles) the timing is 34 deg all out at 3200 rpm but It will ping on the freeway. Should I try a colder plug? Or could my jetting be too lean and making it ping? I'm pretty frustrated with this blasted thing, it's new and I can't even have fun with it without problems.

10-24-2009, 07:43 PM	#2
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,008	Re: Pinging Problems What octane fuel are you running? Cheap gas can cause pinging. With that compression, I would be running 91 in it. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

10-24-2009, 07:56 PM	#3
mikajo39 Gearhead and audio junkie Join Date: Aug 2008 Location: nunyah Posts: 452	Re: Pinging Problems Oops knew I forgot something, I'm running 91 best I can get here in cali. Usually buy from the 76 or chevron no cheapy gas is used.

10-24-2009, 07:58 PM	#4
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: Pinging Problems Could be several things or all the things I mention. To hot a plug, high zinc/lithium oil ( Diesel oil) and worn valve guides or a lot of blow by in the engine. The zinc gets into the cylinders and you get hot spots and pinging. Use an oil that is for later model engines not the high Zinc oil, run a R43TS (colder) plug and 93 octane gas, Set your timing at 6-8 BTDC. Thats the only way I got mine to stop pinging and run decent. My other option is a rebuild to stop the blow by and fix the guides. Last edited by dwcsr; 10-24-2009 at 07:59 PM.

10-24-2009, 08:01 PM	#5
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,008	Re: Pinging Problems I figured with your detailed post that you were running 91, but had to ask Too bad 91 is the best we can get here __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

10-24-2009, 09:02 PM	#8
silverstreak Registered User Join Date: Mar 2009 Location: USA Posts: 255	Re: Pinging Problems Running lean can make it ping as well. What type / size carb are you running? Does it do it at WOT also?

10-25-2009, 08:52 AM	#10
silverstreak Registered User Join Date: Mar 2009 Location: USA Posts: 255	Re: Pinging Problems OK, Edelbrock makes a few different versions of the 600. Look on the front of the carb just below the passenger side front mounting ear where it bolts to the intake. The part number should be stamped there. The two most common versions are the 1405 and 1406. The 1406 is calibrated for a near stock engine and is lean calibrated for fuel economy. The 1405 is calibrated richer for a performance engine. If you're pushing 400hp you probably need the 1405, however if you have the 1406, it can be calibrated richer. Here's what I would do. Buy or borrow an air fuel ratio monitor. http://www.summitracing.com/parts/EDL-6593/?image=large and see where the AFR is at part throttle. If it's indicating lean at that point, you can use a calibration kit http://www.summitracing.com/parts/EDL-1487/?image=large to richen the carb at part throttle with the various jets, metering rods and step up springs. Here are some links to tuning the Edelbrock carbs: http://www.carcraft.com/techarticles...ing/index.html http://www.telusplanet.net/public/gi.../section_2.htm

10-25-2009, 10:30 AM	#11
mikajo39 Gearhead and audio junkie Join Date: Aug 2008 Location: nunyah Posts: 452	Re: Pinging Problems Well I'm over 400hp. I know I have the one tuned for performance, the 1405. I'll have to take it into shop class we have A/F gauges there. I think my next step is colder plugs and jetting it up

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