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Old 11-27-2002, 00:19   #1 (permalink)
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351c Pinging

Ok, u blokes lets see what you guys reckon, I'm desperate !!! My 351 clevo has been running choice ever since I got it (about 5 months ago). I have always run it off premium fuel, and it was running sweeeet. But then I lost my job alas, and I was povo for a while so I filled up with LPR. Since that tank she's been pinging and I'm very upset. I have filled it up ever since with premium but she still pings. I screwed around with the timing, that didn't work so I set it back to 6BTDC, then I got new sparkies coz I thought carbon buildup, but to no avail. Then I got octain boost, and that did nothing, although I did put that in on a full tank ? Right now I'm currently running the tank dry and get a fresh batch of premium. PLEASE HELP ! I'm running outta ideas. I know its not the motor (compression and the like) because it was running like a dream. Its got me stuffed. Any advice would be greatly appreciated. Cheers.
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Old 11-27-2002, 00:51   #2 (permalink)
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Our 302c was pinging bad its runnin on LRP my dad retarded the timing abit, new points now she runs smooth on LRP. dunno if that helps.
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Old 11-27-2002, 04:25   #3 (permalink)
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no vacuum leaks that have appeared by accident????? Are you filling it on premium or Synergy8000/Optipoo or such? I found that anything less that the 'real' premium unleadeds made the car ping its nuts off
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Old 11-27-2002, 12:21   #4 (permalink)
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what year clevo you got... I heard that you need hardend valves to run unleaded??

if there any criteria for what cars can and carn't run ULP???
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Old 11-27-2002, 12:40   #5 (permalink)
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I have a 1973 351 Clevo and I can't get it to idle below 1,500 RMP. The engine was just rebuilt.:(
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Old 11-27-2002, 12:44   #6 (permalink)
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what carbie you got on their?
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Old 11-27-2002, 12:50   #7 (permalink)
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That LPR - you mean LRP (lead replacement petrol), supposed to have an octane rating of 97 (last I heard), so that should not cause pinging. Or do you mean ULP - that's normally 91 and is one step removed from cat's piss and an insult to the motoring public.

You could have got a stale batch, most servos are phasing out LRP as demand drops. I would drain the tank and use the top octane stuff with a valve seat recession additive.

What compression ratio is it?

mdriver315 - you should start a new thread on this, otherwise we all get confused. Just hit the "new thread" button at the top of the page and ask away. You will get more responses like that.
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Old 11-27-2002, 15:58   #8 (permalink)
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Check your spark advance it is quite common for the small springs on the mechanical advance to break or loose there tension.Try to mark your pully at the max advance.I don't know what it is but say 28* mark the pulley at that. Then with timming light at say 2500rpm it should not go over that mark on front pulley. Some tune THAT way, saying it's when the engine is actually working as against when idling.. Spark plug leads fireing order right?If the valve guides are worn will do this also due to build up of carbon not good for good combustion..A problem on high mileage Clevo's due to there valve angle and rocker ratio..

Another is it getting "hot" not nessessary over heating but the combustion chambers/ heads maybe getting hot esp in this weather. Running too lean can cause it too..

A trick we used to do years ago was pour slowly some upper cylinder lube [2 stroke will do] down carbie about 1/2 a cup. Leave it some time to soften any carbon, then take it for a good hard drive.Some water injection does help also..
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Old 11-29-2002, 03:14   #9 (permalink)
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My mate has a 64 holden with a 202 and on LRP it pings like a bitch. On PULP it runs pretty good. I keep telling him how he's choking the atmosphere not having any cats, EGR and PCV valves or cahrchol cansters. He says he will choke me. LOL.
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Old 11-29-2002, 04:51   #10 (permalink)
Two SC 61's = trouble
 
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If its pinging retard the spark. Loosen bolt that holds dist and turn a few degree, same rotation as rotor. It maybe slightly slugish in cold weather but your engine and fuel economy will love you for it!!!Better still get it tuned.. Detonation kills engines!!
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