Jackham Posted January 23, 2021 Report Share Posted January 23, 2021 Anyone know what has caused this? The gap between the blue writing and metal is how far it moved up and down Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
375hp banshees Posted January 23, 2021 Report Share Posted January 23, 2021 Could be defect,vibration, detonation...throw it away Quote Link to comment Share on other sites More sharing options...
n2otoofast4u Posted January 24, 2021 Report Share Posted January 24, 2021 Not that uncommon. Replace the plug, check netting and timing. Quote Link to comment Share on other sites More sharing options...
Jackham Posted January 24, 2021 Author Report Share Posted January 24, 2021 Not that uncommon. Replace the plug, check netting and timing. What should be my timing be at I’ve got a 421 20cc domes running 99ron with octane boosterSent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Keno Posted January 24, 2021 Report Share Posted January 24, 2021 99 RON is like 93 AKI? Octane booster is usually trash. And your compression is probably around 180 psi? I would keep timing stock and run a wide squish. Replace the plug and suspect deto if it happens again or your plugs keep backing out. You could try richening your main a bit to lessen the chances of deto. Other option is to put some 23cc domes in. Quote Link to comment Share on other sites More sharing options...
hoppedupandcutdown Posted January 25, 2021 Report Share Posted January 25, 2021 ^^^That^^^ You need way more octane for that setup. And Octane Booster is trash. 1 Quote Link to comment Share on other sites More sharing options...
Jackham Posted January 25, 2021 Author Report Share Posted January 25, 2021 I had the problem of my plugs backing out a few times and put octane booster in and not had a problem yet until this! According to the last guy that owned it he said it was 155 psiSent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Keno Posted January 25, 2021 Report Share Posted January 25, 2021 155 on a 4mil is 24cc domes Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted January 25, 2021 Report Share Posted January 25, 2021 If you're breaking plugs or backing them out, you're lean. Add fuel or octane. Quote Link to comment Share on other sites More sharing options...
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