Alex29573 Posted February 14, 2010 Report Share Posted February 14, 2010 Can someone tell me if when sparkplugs get loose - if its a problem with not enough octane or is it a problem with too lean of a jet? thanks Quote Link to comment Share on other sites More sharing options...
WantABanshee Posted February 14, 2010 Report Share Posted February 14, 2010 Banshee's vibrate ALOT. Not to insult but are you snugging them down good enough? Quote Link to comment Share on other sites More sharing options...
Alex29573 Posted February 15, 2010 Author Report Share Posted February 15, 2010 yes im tightening them hard enough... im runninig an uncorrected 12:1 compression ratio with 7 degree timing advance. i run sunocco 110 that gas is leaded/unoxygenated and 105 MON, 110 (r+m)/2 Quote Link to comment Share on other sites More sharing options...
Rodneya Posted February 15, 2010 Report Share Posted February 15, 2010 (edited) Plugs backing out are caused by detonation due to too low octane fuel for your compression. Vibration will not do it unless they are only finger tight and lean jetting will cause pre-ignition which will melt holes in the piston. Dont run it like that. It will be expensive. You bjust beat me with your answer, but 7 deg timing could also be a cause Edited February 15, 2010 by Rodneya Quote Link to comment Share on other sites More sharing options...
Alex29573 Posted February 15, 2010 Author Report Share Posted February 15, 2010 sunoco says that gas is good up to 13:1 compression but im thinking i might need something rated for more compression since im mixing the fuel with oil... can anyone help???? Quote Link to comment Share on other sites More sharing options...
Heavymod Posted February 15, 2010 Report Share Posted February 15, 2010 Sounds like to me that 7 degrees timing might be a little too much timing...I would back it down to at least 5 degrees timing. Sounds like it is pre detonating at 7 degrees. We have had plugs starting to loosen up at 5 degrees with 110 octane race fuel. We usually run Sunoco or Turbo Blue. Quote Link to comment Share on other sites More sharing options...
T_Shee Posted February 15, 2010 Report Share Posted February 15, 2010 Sounds like to me that 7 degrees timing might be a little too much timing...I would back it down to at least 5 degrees timing. Sounds like it is pre detonating at 7 degrees. We have had plugs starting to loosen up at 5 degrees with 110 octane race fuel. We usually run Sunoco or Turbo Blue. x2 cant hurt to back it down and try it. Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted February 15, 2010 Report Share Posted February 15, 2010 You've got some detonation issues going on. If your plugs are backing out, don't just keep tightening them up and keep riding. Fix the problem. I'd try by backing your timing down a little bit and see if it helps. If not, then you have 2 options... bigger domes, to drop your compression to where the detonation stops, or change fuels. If it were me, I'd just swap to methanol and keep the domes and timing you have now. It takes a hell of a lot to detonate meth, and your engine will run cooler. Quote Link to comment Share on other sites More sharing options...
T_Shee Posted February 15, 2010 Report Share Posted February 15, 2010 is it stock stroke? had a buddy with a 4 mil and the domes were cut wrong causing his plugs to back out. Quote Link to comment Share on other sites More sharing options...
powertripn Posted February 15, 2010 Report Share Posted February 15, 2010 Can someone tell me if when sparkplugs get loose - if its a problem with not enough octane or is it a problem with too lean of a jet? thanks I had the same problem on mine a while back.I had no detonation and the jetting was right on.My plugs just seem to loosen slightly after a hard ride.I bought a plug lock for mine on ebay and solved the problem. Quote Link to comment Share on other sites More sharing options...
Rodneya Posted February 15, 2010 Report Share Posted February 15, 2010 I had the same problem on mine a while back.I had no detonation and the jetting was right on.My plugs just seem to loosen slightly after a hard ride.I bought a plug lock for mine on ebay and solved the problem. Running a plug lock is asking to demo your motor. Quote Link to comment Share on other sites More sharing options...
THE358BANSH Posted February 15, 2010 Report Share Posted February 15, 2010 Are there any signs of detonation on the plug itself? Evan Quote Link to comment Share on other sites More sharing options...
Alex29573 Posted February 15, 2010 Author Report Share Posted February 15, 2010 the plugs look good but then again i havent kept riding it. i let it happen twice and i stopped riding. im at a plus 7 timing b/c jim from passion told me to do that. its a 421 setup. he told me to do 110 octane but i think the problem is that sunocco 110 is not really the same as vp. im going to talk to him today. thanks guys Quote Link to comment Share on other sites More sharing options...
spurdy Posted February 15, 2010 Report Share Posted February 15, 2010 Running a plug lock is asking to demo your motor. X 2 !!! Quote Link to comment Share on other sites More sharing options...
MILO Posted February 15, 2010 Report Share Posted February 15, 2010 im at a plus 7 timing b/c jim from passion told me to do that....im going to talk to him today. thanks guys not that the folks here don't know what they're talking about, but getting in touch with your builder would be the best first step. Quote Link to comment Share on other sites More sharing options...
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