252wheelieking Posted May 19, 2012 Report Share Posted May 19, 2012 So what color are you guys plugs when you're are checking them running 100LL? I checked mines & they are grey. Quote Link to comment Share on other sites More sharing options...
EvilBanshee Posted May 19, 2012 Report Share Posted May 19, 2012 So what color are you guys plugs when you're are checking them running 100LL? I checked mines & they are grey. That is perfect!! Dont let anyone fool you saying its lean. They dont know shit. Ledded fuel runs Light grey even almost a white when it perfectly tuned. Trust me. Your fine. Been running 100LL for YEARS Quote Link to comment Share on other sites More sharing options...
Nightmare Posted May 19, 2012 Report Share Posted May 19, 2012 I got it! 100LL blue. Just Got 12 gallons from the airport. $5.20/gallon. Ouch!!! Cheaper than VP though! Thats really not a bad price. I think its close to 7 bucks here in Albuquerque Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted May 19, 2012 Report Share Posted May 19, 2012 That is perfect!! Dont let anyone fool you saying its lean. They dont know shit. Ledded fuel runs Light grey even almost a white when it perfectly tuned. Trust me. Your fine. Been running 100LL for YEARS Thanks I heard the samething before from a member on here. I just needed a second opinion....I will run a second set of plugs with richer mains just to see if the color changes. Im hoping to see the grey get darker, if so I think I can finally read these plugs using this fuel from that. I have less than 155psi. with +4 timing, how much more compression & timing could I add to 100LL & be safe?....it's not a drag bike but more of a duner 421 cub. I should asking how much compression & timing was you running using 100LL for years? Quote Link to comment Share on other sites More sharing options...
EvilBanshee Posted May 21, 2012 Report Share Posted May 21, 2012 Thanks I heard the samething before from a member on here. I just needed a second opinion....I will run a second set of plugs with richer mains just to see if the color changes. Im hoping to see the grey get darker, if so I think I can finally read these plugs using this fuel from that. I have less than 155psi. with +4 timing, how much more compression & timing could I add to 100LL & be safe?....it's not a drag bike but more of a duner 421 cub. I should asking how much compression & timing was you running using 100LL for years? I have the same set up. 22cc domes, +5 timing. I was wondering the same. I thought maybe 20cc domes max? But that may be asking for trouble. I wouldnt do less then 21cc domes on 100LL Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted May 21, 2012 Report Share Posted May 21, 2012 (edited) I have the same set up. 22cc domes, +5 timing. I was wondering the same. I thought maybe 20cc domes max? But that may be asking for trouble. I wouldnt do less then 21cc domes on 100LL I tried some 93 pump gas yesterday & almost blew this engine. It started detonating, spark plugs backed out & right cylinder died & was smoking like a freight train. I turned it off & rechecked compression & it was 140-145psi. with the tip being 1/4" shorter than spark plug tip. So it has to have more compression than what the tester is reading. I'm also running +4 timing. I did not have any problems at all before I use 93 pump. So today im going to get 5 gallons of 100LL & see if it gets back to running good. Edited May 21, 2012 by 252wheelieking Quote Link to comment Share on other sites More sharing options...
EvilBanshee Posted May 21, 2012 Report Share Posted May 21, 2012 I tried some 93 pump gas yesterday & almost blew this engine. It started detonating, spark plugs backed out & right cylinder died & was smoking like a freight train. I turned it off & rechecked compression & it was 140-145psi. with the tip being 1/4" shorter than spark plug tip. So it has to have more compression than what the tester is reading. I'm also running +4 timing. I did not have any problems at all before I use 93 pump. So today im going to get 5 gallons of 100LL & see if it gets back to running good. YOur compression ratio will be around 14:1. 93 octane is for engine with compression around 11-12:1 Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted May 21, 2012 Report Share Posted May 21, 2012 YOur compression ratio will be around 14:1. 93 octane is for engine with compression around 11-12:1 I pulled the head today & the right cylinder dome oring blowed & was letting coolant in the right cylinder. Everything stills looks good so im going to order a new oring kit put it back together & stick with the 100LL. Quote Link to comment Share on other sites More sharing options...
hotrodbanshee Posted May 22, 2012 Report Share Posted May 22, 2012 Is the 100LL avgas rated at 100octane? Sorry if this is a dumb question. I head from a friend it is around 110 octane. Which is it? Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted May 23, 2012 Report Share Posted May 23, 2012 Is the 100LL avgas rated at 100octane? Sorry if this is a dumb question. I head from a friend it is around 110 octane. Which is it? No it's not a dumb question......From what I was told it's rated 100 octane...& I will be using it from now on....It is a damn good fuel in my opinion. Quote Link to comment Share on other sites More sharing options...
hotrodbanshee Posted May 23, 2012 Report Share Posted May 23, 2012 I am going to make the switch to av gas as soon as I use up the fuel I use now. Right now I am using a 50/50 mix of VP C12 108 octane and pump gas 93 octane with koltz super techniplate mixed at 36:1. Should I use straight av gas 100LL mixed 36:1 when I make the switch? Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted May 23, 2012 Report Share Posted May 23, 2012 I am going to make the switch to av gas as soon as I use up the fuel I use now. Right now I am using a 50/50 mix of VP C12 108 octane and pump gas 93 octane with koltz super techniplate mixed at 36:1. Should I use straight av gas 100LL mixed 36:1 when I make the switch? what is your compression ration & timing? Quote Link to comment Share on other sites More sharing options...
hotrodbanshee Posted May 23, 2012 Report Share Posted May 23, 2012 (edited) 170psi and +6 timing Edited May 23, 2012 by hotrodbanshee Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted May 23, 2012 Report Share Posted May 23, 2012 (edited) 170psi and +6 timing Yes run 100LL straight....check your plugs after you switch cause it is leaded & oxygenated....you will most likely have to richen your mains 1-2 sizes.....after that you will like it... Oh yeah the plugs give a grey reading instead of brown....but you read them the same way....white is lean & the darker the grey the richer you are. Hope that helps. Edited May 23, 2012 by 252wheelieking Quote Link to comment Share on other sites More sharing options...
ginger Posted May 23, 2012 Report Share Posted May 23, 2012 from everything i have read, 100ll is not oxygenated. Also, depends on your gas provider, my local airport it is 108octane, im friends with the owner of the place. Quote Link to comment Share on other sites More sharing options...
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