Pinging - Pre-ignition... please elaborate?

Andy /

Sep 18, 2008 10:48PM

I'm trying to find info about pre-ignition. I suspect I might have a pre-ignition problem, but I'm not sure about the signs.

I have a stock peugeot 103 w/ 15/15 sha, reeds, performance exhaust, etc.

It started making a high-pitched "pinging" noise once I added the performance exhaust... but only at mid-high rpms. At full rpms, you don't always notice it.

anyhow... I've got a head gasket and base gasket. Don't want to add more and lose compression.

What about timing? should I advance it or retard it? I'd just be doing it by putting a piston stop in, and chaging the placement of the flywheel... I have the current spot marked.

thanks for the advice, the wiki is not so clear.

Re: Pinging - Pre-ignition... please elaborate?

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zach

Sep 19, 2008 06:51AM

retard your timing if you are pinging. check for a little melted spot on your piston.

Re: Pinging - Pre-ignition... please elaborate?

Andy /

akpasta OP

Sep 19, 2008 08:11PM

what about spark plug? Is minor pinging noticable by looking at the plug? My plug looks fine... could it just be my pipe has a metallic sound? It's a simonini "top one" from treats hq

Re: Pinging - Pre-ignition... please elaborate?

Ed /

soapscum57

Sep 19, 2008 08:19PM

okay, i think(having read your other posts) that you might not be pinging. pinging usually happens when you run high compression, but it could also be your timing. sure, your pipe should cause things to compress a little better, but i doubt it would cause any pre-ignition.

how pre-ignition or pinging usually happens is when things get too hot or too compressed and the fuel air mixture ignites before your piston reaches the proper spot. with a low compression head i doubt this could be happening.

try putting a little extra gas tank on, with high octane gas in it. run it for a while and see if that makes any difference. higher octane is less likely to pre-ignite.