r6rider04 Posted February 6, 2006 Report Share Posted February 6, 2006 right now i'm running 50/50 93octane and VP c-12, but its getting expensive so i was wondering if running straight 100LL would be better or worse. Right now i'm paying about 35 bucks/ tank and runnin straight AV-gas would save me about 15 bucks/ tank, any insight would be appreciated thanks, Brian Quote Link to comment Share on other sites More sharing options...
banshee tuner Posted February 6, 2006 Report Share Posted February 6, 2006 What is your compression, how much is your head milled? Quote Link to comment Share on other sites More sharing options...
Fasttoy Posted February 7, 2006 Report Share Posted February 7, 2006 (edited) ave gas is for airplanes ,,,,and thats it ...if you compression is below 155 you can just run the good pump fuel...you have the same mods as me ,,except the pipes ,i have fmf,,and CPI drag pipes ,mine works great on pump gas,,,i am at sea level ...my head is shaved off .035ths ,,,, Edited February 7, 2006 by Fasttoy Quote Link to comment Share on other sites More sharing options...
87banshee388 Posted February 7, 2006 Report Share Posted February 7, 2006 Run an 50/50 mix with 93 and 110. it would oly be about $10 for three gallons Quote Link to comment Share on other sites More sharing options...
fastbanshee4u Posted February 7, 2006 Report Share Posted February 7, 2006 I would like to see a compression reading.Alot of people run higher octane than really needed.High octane does not run better ,it just keeps from detenating. Quote Link to comment Share on other sites More sharing options...
brock_fuzzy_69 Posted February 7, 2006 Report Share Posted February 7, 2006 oh common guys plenty of racers run AV gas its just fine dont buy into all the myths and BS that revolves around the AV gas subject but AV here is 3.59 a gal and 110 is 4.00 so 110 is fine for me Quote Link to comment Share on other sites More sharing options...
dawarriorman Posted February 7, 2006 Report Share Posted February 7, 2006 Its quite obvious that you have no concept or understanding of specific gravity and the differences, but if you want to use AvGas go ahead, after all it is your motor. But then again what would a Aviation Mechanic know about AVGAS. 469996[/snapback] I've done a lot of research on it, and AV gas works fine for normal motors. The specific gravity is no lower than alot of race fuels. It has plenty of octane, and its not only for high altitudes, or else how would the planes land? And your normal car doesn't rev higher than 6 grand, so can you say pump gas isn't for high rpm? Quote Link to comment Share on other sites More sharing options...
sandrappy Posted February 7, 2006 Report Share Posted February 7, 2006 I've done a lot of research on it, and AV gas works fine for normal motors. The specific gravity is no lower than alot of race fuels. It has plenty of octane, and its not only for high altitudes, or else how would the planes land? And your normal car doesn't rev higher than 6 grand, so can you say pump gas isn't for high rpm? 470005[/snapback] Exactly. Planes have to land and take off so the gas must be good enough to do that since this is a vital part of flight. Plus how do you make a gas for low rpm's? Trust me I have use av gas for years, and it is fine. They acutally hold av gas to much higher standards then regular gas because if they have a bad batch of av gas the consiquences are much more serious. Like everyone has said av gas is designed for high altitude. Do you know how the make the gas better for high elevations? They add more alcohol to the gas to increase the oxygen in the fuel. So basically av gas is a more oxygenated fuel then other typical fuels, which will increase the power over a non oxygenated fuel. I don't see the drawl back of this. Also all gas has a go through a ron, or mon rating system. This rating is the same for all gas, so it's octane ratings are the same used on other types of fuels. Heck Sunoco has a fuel specifically designed for small bore high rpm engines. However, I bought some and did some testing on it, and it showed no gain in power at all. Gas that is "designed" for a certain task I feel is just marketing schemes, because like I said before you should judge the quality of the fuel form the ron and mon ratings. However av gas isn't the best thing since sliced bread, there are drawl backs to running av gas. Even though it says it is 100LL (low lead) it is just lower lead level then it use to be. It still has 5 times the amount of lead then old leaded pump gas use to have. So you will develop deposites quickly in the combustion chamber. However if you rebuild often, like a 2 stroke should be, then it isn't a big deal. Plus the lead actually acts as a lubricant. Just my $.02 Quote Link to comment Share on other sites More sharing options...
r6rider04 Posted February 7, 2006 Author Report Share Posted February 7, 2006 a few of you asked for my compression and it is 162 on both cyls. give or take 1-2 psi, and i did try running it on straight pump gas and it ran like shit and the motor sounded like shit. i've looked into buying race fuel in bulk but i cant swing 500-600 bucks for that, so i'm stuck buying it by 5 gallon cans @ $8/gallon, I just wanted to see what the pros and cons of av-gas were thanks guys for all your thoughts Quote Link to comment Share on other sites More sharing options...
banshee tuner Posted February 7, 2006 Report Share Posted February 7, 2006 If it runs good on the av gas run it. I have 150 psi and I run 93 octane but if it was much higher I would run race gas. Quote Link to comment Share on other sites More sharing options...
brock_fuzzy_69 Posted February 7, 2006 Report Share Posted February 7, 2006 sorry if i stepped on any toes but guys will afrgue till the end of time on wheather or not to run AV gas some airplane mechs say its fine to runa dn other will say not to run it Quote Link to comment Share on other sites More sharing options...
dawarriorman Posted February 8, 2006 Report Share Posted February 8, 2006 sorry if i stepped on any toes but guys will afrgue till the end of time on wheather or not to run AV gas some airplane mechs say its fine to runa dn other will say not to run it 470266[/snapback] Exactly, people will argue till the end of time. I've read up quite a bit on it, talked to people that have used it (in drag cars), and they haven't had the smallest problem. And those are engines that would have blown holes in the pistons with 93 octane (the one guy did the first time he ran the motor). Until somebody can give me a real reason, and back it up with credible data, then Im going to keep running it. Just saying its designed for an airplane, and this isn't an airplane is not a good reason. Im going to say it now. Pump gas is designed for cars, and its no good for quads. Everybody stop using pump gas now. See how stupid that sounds. Quote Link to comment Share on other sites More sharing options...
fastbanshee4u Posted February 8, 2006 Report Share Posted February 8, 2006 I had run av gas for two seasons,and up to 210#s of compression.Never a problem.Trinity racing told me their sponsered riders run it for the whole race season.You buy the overpriced race fuel,while I will continue to use 100LL ave gas.Although,some airports are getting stricter on selling to so many of us who are trashing our engines. Quote Link to comment Share on other sites More sharing options...
lonestar Posted February 8, 2006 Report Share Posted February 8, 2006 I used AVgas for about 8 years with no problem at all. It's refined fuel. Clean fuel. Alot of people out west us it too with no problems. Quote Link to comment Share on other sites More sharing options...
RNBRAD Posted February 9, 2006 Report Share Posted February 9, 2006 Also all gas has a go through a ron, or mon rating system. This rating is the same for all gas, so it's octane ratings are the same used on other types of fuels That is not correct. The MON of av and pump gas is tested the same, but the av gas still goes through a converting process which will result in a tad smaller octane (very minimal). The RON of AVgas and pump gas is tested altogether different and the numbers between the 2 aren't even close. Quote Link to comment Share on other sites More sharing options...
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