SonOfSand Posted April 4, 2012 Report Share Posted April 4, 2012 So I get the bump in timing but I was also told that I should go up one size on the pilots to make the switch to av gas. Is that a what move av gassers have done? No, just make the switch then jet according to how the engine responds. Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted April 4, 2012 Report Share Posted April 4, 2012 (edited) 5000 feet I think I need some 23cc or 24cc domes then cause im at sea level. From my understanding you should lower one dome size for every thousand feet of elevation that you rise to keep your compression acceptable for your fuel octane rating. Then opposite for every thousand feet of elevation lowered. So if im at sea level & running 22cc domes that makes me have to run 110 race fuel or you think 100LL av gas will keep it from detonation? I dont have easy access to 110 race fuel but I can get 100LL av gas easy. Edited April 4, 2012 by 252wheelieking Quote Link to comment Share on other sites More sharing options...
SonOfSand Posted April 4, 2012 Report Share Posted April 4, 2012 I think I need some 23cc or 24cc domes then cause im at sea level. From my understanding you should lower one dome size for every thousand feet of elevation that you rise to keep your compression acceptable for your fuel octane rating. Then opposite for every thousand feet of elevation lowered. So if im at sea level & running 22cc domes that makes me have to run 110 race fuel or you think 100LL av gas will keep it from detonation? I dont have easy access to 110 race fuel but I can get 100LL av gas easy. HOw much timing did you want to run? who sold you the domes, and what did they say? Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted April 4, 2012 Report Share Posted April 4, 2012 (edited) HOw much timing did you want to run? who sold you the domes, and what did they say? I want to run the correct timing to make fun, fast & more reliable. I brought the domes from a member on here who had Andy at M&M cut them. The guy I brought them from said he had Andy at M&M cut them & they we're set up for 100LL & pump gas. He said he ran pump gas without any problems, but im nervous cause I been having bad luck with my engines here lately. I PM'd Andy & he said if he cut the domes they would be ok for pump gas & 100LL will most definitely work. Now the part that gets me nervous is that from what im reading & was told 22cc domes require 110 race fuel. If I run 100LL I will not be able to run any timing. From the looks of your set up, i dont think i can even think about pump gas with 22cc domes at sealevel (82ft). Edited April 4, 2012 by 252wheelieking Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted April 4, 2012 Report Share Posted April 4, 2012 Hey 252, Just to confirm, i ran those domes for some time on pump and on 100ll without problems. I ran about 3-4* timing. You have to remember that there is a lot more to domes than just the CC's of the dome. The more i research ,the more i find that to be the case. So what that means is not all 22cc domes require the same fuel octane rating. Of course thats not even counting the setup of the engine. Different band widths and percentages ,different band angles ,and many more things that im still learning about,all affect the way the dome works...not just the CC's. Im sure Andy knows his dome setups. That... and the fact that i actually ran those domes on pump should set your mind at ease. Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted April 4, 2012 Report Share Posted April 4, 2012 Hey 252, Just to confirm, i ran those domes for some time on pump and on 100ll without problems. I ran about 3-4* timing. You have to remember that there is a lot more to domes than just the CC's of the dome. The more i research ,the more i find that to be the case. So what that means is not all 22cc domes require the same fuel octane rating. Of course thats not even counting the setup of the engine. Different band widths and percentages ,different band angles ,and many more things that im still learning about,all affect the way the dome works...not just the CC's. Im sure Andy knows his dome setups. That... and the fact that i actually ran those domes on pump should set your mind at ease. Ok im going to use 100LL with +3* timing to start out with. Im just being cautious cause of the last two engine I had to blow in 1 years time. I can see that the domes are still good & looks brand new. You are right I have alot to learn about domes. Quote Link to comment Share on other sites More sharing options...
sprinklerman Posted April 4, 2012 Report Share Posted April 4, 2012 I understand that. You said you've had some bad luck with your engine? Did you sort out what the problem was? Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted April 4, 2012 Report Share Posted April 4, 2012 I understand that. You said you've had some bad luck with your engine? Did you sort out what the problem was? No not yet....im leaning more towards something is wrong with the cases. My reason is because have rebuilt stock banshee motors alot & never had this happen to any of them except mines. I just finish rebuilding the topend on my cousin motor. I built that bottomend also & I checked the rods on the crank & everything is still passing specs. I never had this problem until i started using these cases. So im going with everthing different, cases, cylinders, & stator. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.