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Author
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Topic: pinging at higher RPM....
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kewljay223
Gearhead Posts: 473
From: Long Beach, California
Registered: Sep 2002
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posted 10-18-2006 07:45 PM
 
hello, if you have read my other post you will know i will be getting a stroker pretty soon. but until then, i would like to get my engine running as good as possible and this pinging thing is really starting to kick my a**!! it started a couple months ago. first i had a problem with the timing or something. the engine would start to run rough or backfire randomly on its own. so i brought it to my mechanic buddy and we tried everything. i got a new air cleaner (k&N), fuel filter, fuel pressure guage to make sure it was adequate, and that didnt fix it. then i just broke down and bought a new edelbrock carb thinking it was dirty inside the old one instead of having it rebuilt. seemed to fix the running rough part but then it started pinging. not thinking about it but just out of reflex i retarded the timing til it went away. then about 3 days later, it would come back. so i retarded it again and made sure the hold down bolt for the dist was tight to make sure it wouldnt move. again, 3 days later it was back. i did this for about 2 weeks!! i had the pertronix points inside and my buddy told me he has had plenty of problems with them so i switched back to points to eliminate that unit. and its still doing it. but this is the weird part that i just noticed last week. the pinging i hear only happens above 2k and really gets loud after 3k and does it when im in low gears such as 2nd but mostly 3rd. 4th gear im on the freeway and cant hear it that well and 5th, well i would be doing over 100 to find out! what the hell is causing pinging at a higher rpm when its supposed to be caused by too advanced timing in a high gear at low rpm (i.e. 4th gear at 1500-2000rpm) pinging is not good for an engine so i would like to fix this asap. any suggestions? please help! this is so irritating
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 10-18-2006 09:31 PM
What octane are you running it it right now??? You might try premium gas and see if that helps.
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kewljay223
Gearhead Posts: 473
From: Long Beach, California
Registered: Sep 2002
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posted 10-18-2006 10:26 PM
I use 91. that's the highest we get here. have been using it since I first fired it up since the rebuild a year ago.
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 10-18-2006 11:06 PM
Hmmm, I have no clue what it could be, sounds like you covered everything. I ran my Pertronix for over 2 years without a problem, but that's not to say this one didn't go bad.------------------
William
M&M# 4256
MCA# 64831 68 Coupe
289
C4
3:55's/Trac-Lok
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honeyburst
Gearhead Posts: 846
From: Nashville, TN, USA
Registered: Mar 2006
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posted 10-19-2006 09:55 AM
you say that when you adjust the timing, it goes away, then comes back........how's your vacumme (sp?) advance ???, you should look at that....I had a similar problem and played around with the springs in the distributer (didn't cure my problem, but I noticed a difference)...... ------------------
Without life there could be no music, but without music, there can be no life.
1973 Convertible, 1965 A Code 4spd coupe, Past: 1969 GT, 1967 6cyl coupe, 1968 coupe
Two Rivers Ford, Parts Dept., Nashville, TN
www.geocities.com/littlewhitecoupe
www.geocities.com/jezebeldream
www.geocities.com/my73conv
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rcodenewf
Gearhead Posts: 151
From: Manitoba, Canada
Registered: Jan 2002
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posted 10-19-2006 10:11 AM
How about some specs on your engine? The first thing I would do is get a dial back timing light and see just what advance curve you have in that distributor. There are lots of causes for pinging so we have to see where to start.
John
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kewljay223
Gearhead Posts: 473
From: Long Beach, California
Registered: Sep 2002
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posted 10-19-2006 09:29 PM
i will get you the specs on the engine tomorrow. gotta look for the cam info. but its mostly stock with bolt on stuff. i using the mechanical advance cuz my vacume in the dist isnt working properly. the only vacume im using is the brake booster from the back of the carb. and ill get to checking the timing tomorrow or on saturday when im not working. thanks for the replies and ill keep you posted.
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kewljay223
Gearhead Posts: 473
From: Long Beach, California
Registered: Sep 2002
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posted 10-24-2006 11:15 PM
hey again. im so sorry this has taken a while. just couldnt find the info and ive been busy. anyway, heres some specs.dur. @ .050 is 214-INT and 224-EXH
SAE dur is 292/302
valve lift is .512/.538
cam lift is .296/.311
lobe spread is 112 i have a dual plane 4bbl offy with stock 2v heads/internals. 600 cfm edelbrock carb with long tube headers bolted to a dual 2 1/2 eshaust with x pipe. basically stock. also my buddy asked me if it pinged while the engine was cold. i didnt know cuz i dont like to push it till its warmed up. he said sometimes engines will ping when they get to hot (or something along those lines) due to some kind of build up on the pistons.... so i went out one morning and noticed that it didnt do it till it warmed up. what does this mean? BTW, my guage tells me it usually shows about 210. i know that seems high but its never lower than that unless its cold out and it doesnt usually get hotter unless im in traffic or a drive through. but i have an electric fan on a switch when im in that situation. i dont recall what the tstat is rated cuz its been a while since i put it in. but lets say it was 190, shouldnt the engine be cooler? well thats my latest update. let me know if you need anymore info.
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 10-24-2006 11:24 PM
Not really, the t-stats run a little higher than what they are rated at, so it sounds normal for a 190. You could always try a 160 and see if it helps.------------------
William
M&M# 4256
MCA# 64831 68 Coupe
289
C4
3:55's/Trac-Lok
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kewljay223
Gearhead Posts: 473
From: Long Beach, California
Registered: Sep 2002
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posted 10-25-2006 02:43 AM
well since its a cleveland it has a special tstat but again i dont recall where/when/what kind i bought. where can i get one that is 160? one of the sponsors here?
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 10-25-2006 08:32 AM
See if this helps.https://mustangsandmore.com/ubb/Forum27/HTML/000218.html ------------------
William
M&M# 4256
MCA# 64831 68 Coupe
289
C4
3:55's/Trac-Lok
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 10-25-2006 10:07 AM
I recommend the Robert Shaw 351C thermostat. You may need to look around for them, though. The last time I bought some I got them online but I can't remember where.Never let anyone tell you the 351C doesn't take it's own thermostat, they have a valve that works with the brass ring in the block. ------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL
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Tom G
Gearhead Posts: 1069
From: Bethlehem, Pa USA
Registered: Nov 2001
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posted 10-26-2006 08:38 PM
Maybe the Edelbrock is leaning out thye are notorious for being lean. They try to set them for economy and emissions.------------------
67 Mustang F/B 302 GT-40X FMS engine RPM Air Gap 650 Holley DP Crane 1.7 roller rockers, Performer Nitrous, ceramic headers WC T5, cable clutch MagnaFlow SS kit W/X Pipe 3.89 9". SSBC 4 piston frdisc Clearwater Aqua, Vintage 40 series 16X8 215 front 255/50 drag radials 308 RWHP@5800rpm 300 tq NA 385rwhp 380 w 75 shot 13.11 @111mph 88 GT (FiveOfastback's ride)
347 Twisted wedge custom HYD roller 565 lift 282 duration Street Heat, BBK headers X pipe
G Force 353 RWHP 393 RWTQ Red/Silver Newest Project!
69 Boss 302 Acapulco Blue
65k original miles Matching number motor and trans
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kewljay223
Gearhead Posts: 473
From: Long Beach, California
Registered: Sep 2002
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posted 10-28-2006 01:29 PM
a lean condition would make it ping? i never heard of that. it was starting to flatten out at around 3700rpm so i changed the metering rod one size richer and it changed a bit to about 4100. i think i need to change it one or two more sizes. buti didnt think that anything to do with the pinging....???
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 10-28-2006 04:34 PM
Yup, leaner mixtures run hotter which create hot spots which promotes detonation.------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL
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