snakeman52646 Posted November 7, 2006 Report Share Posted November 7, 2006 Ok did a search ,did get alot of differ info. but just curious for my personal situation. Got a 98 banshee: bored .80 over (just done) milled head alien dmc exhaust adjustable timing plate( set on +4 as I type) reed spacers did compression test got 200 in each jug ( did few differ times got same) So my question is the place i can get racing fuel has 112 octane,and 119 octane. Which would be to my advantage to run? Also leave my timing where it's at or not? thanks for your time, billie. Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted November 7, 2006 Report Share Posted November 7, 2006 Ok did a search ,did get alot of differ info. but just curious for my personal situation. Got a 98 banshee: bored .80 over (just done) milled head alien dmc exhaust adjustable timing plate( set on +4 as I type) reed spacers did compression test got 200 in each jug ( did few differ times got same) So my question is the place i can get racing fuel has 112 octane,and 119 octane. Which would be to my advantage to run? Also leave my timing where it's at or not? thanks for your time, billie. well first off if your not running bigger carbs you dont need that spacer... but 200 lbs is really high you got a stroker or is it stock crank? you should be ok on the 112... Quote Link to comment Share on other sites More sharing options...
Polish Posted November 7, 2006 Report Share Posted November 7, 2006 200lbs in each jug :ohmy: Quote Link to comment Share on other sites More sharing options...
snakeman52646 Posted November 7, 2006 Author Report Share Posted November 7, 2006 (edited) stock crank, and larger carbs, and port and polish job. also tested a few times with my tester and my friends tester and it was always around same 200 in each jug.. what about the timing? any suggestions? thanks again, Billie Edited November 7, 2006 by snakeman52646 Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted November 7, 2006 Report Share Posted November 7, 2006 (edited) +4 or +6 either way you go advance timing or not 200 lbs your going to need race gas... Edited November 7, 2006 by Bansh-eman Quote Link to comment Share on other sites More sharing options...
snakeman52646 Posted November 7, 2006 Author Report Share Posted November 7, 2006 went with the 112 octane with klotz. left the timing at +4. can hear pinging at idle. seems to run and idle fine. Basically sounds like a bb in my pipes. It's not over heating. any help would be appreciated. Billie Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 7, 2006 Report Share Posted November 7, 2006 Someone cut that head too thin. Get a new one. NO WAY you should have that much compression...period. Not to mention, that is going to destroy that crank if it hasn't been welded. I'd bet the squish is so tight, it's only a matter of time before that thing gernades... Quote Link to comment Share on other sites More sharing options...
baddsheee Posted November 7, 2006 Report Share Posted November 7, 2006 Would definitely agree with dajogejr. Seems like someone got mill happy on that head. You could only take off so much on a stocker. Need more like a cool head. Wouldn't risk running that. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 7, 2006 Report Share Posted November 7, 2006 I run 185PSi or so in my cub, NOSS Head, not sure on dome size....big bore domes. I run 110 octane all day. (Switching to alky...) But, I'm 100% certain my squish clearance is acceptable....no pinging, detonating or preignition... Normally I'd say the tester itself is suspect...but, if you're running that much compression, with 113 octane gas and only 4 degrees of timing, yeah....that head is fubar.... Get a NOSS head or another stocker, and have .025 or .030 milled off. PM Rocketboy here, I know he machines them...and might have one laying around. Quote Link to comment Share on other sites More sharing options...
snakeman52646 Posted November 7, 2006 Author Report Share Posted November 7, 2006 ok , I really appreciate your guys help. One more think, would running it the way it is cause head gaskets to blow? I had a couple of the go on me. Billie Quote Link to comment Share on other sites More sharing options...
dajogejr Posted November 7, 2006 Report Share Posted November 7, 2006 HELL YES!!!! You're lucky, that motor is telling you something....a 20 dollar head gasket is a lot cheaper than a top end and crank! I almost asked you if it was popping gaskets.... Yeah, I would stop running that bike all together, it's only going to get more expensive to fix!! Quote Link to comment Share on other sites More sharing options...
snakeman52646 Posted November 7, 2006 Author Report Share Posted November 7, 2006 ok, it's done running til I get a new head and gasket. Thank you so much, you save me a tremedous amount of time ,money, and suffering. billie Quote Link to comment Share on other sites More sharing options...
snakeman52646 Posted November 7, 2006 Author Report Share Posted November 7, 2006 so basically it ran fine before when it was bored .20 over and had the same head on it. But boring it to .80 over and using the same head causes the problem because of the head being milled to far and more compression from being .80 over now? just want to make sure i understand what your saying. thanks, Billie Quote Link to comment Share on other sites More sharing options...
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