What kind of fuel?

[bansheemorphine]

I just bought an 04 450r with a sparks head and cam, +3mm stroker crank and a 13:1 comp piston(i think). The previous owner ran c12 but it is a little expensive for me. I have heard of some people running aviation fuel, mostly the stuff called 100ll.

I have searched and searched and can't seem to get a straight answer. Is the aviation fuel good for my motor? does it have enough octane to run that high of compression safely, also do people run the av gas pure or do they mix it with something?

[jersey devil]

Av gas has lead in it and you will ruin the valve seats and valves by running it.DON"T USE IT!What ever you use make sure it is unleaded!

[BlaineKaiser450]

Originally posted by jersey devil
Av gas has lead in it and you will ruin the valve seats and valves by running it.DON"T USE IT!What ever you use make sure it is unleaded! leaded is okay. Aviation fuel has non-freezing agents in it so its bad for the motor unless its designed for it. you would probably be fine with 100 or 104 octane

[bansheemorphine]

so from your experience a mix of 50/50 91 octane pump gas and 100ll should be fine? and should have enough octane for my motor with 13:1 compression?

[JJs450r]

torco 110 for me, maybe sunoco 110 every once in a while

[bansheemorphine]

What does that stuff cost?

[ss440ex]

Question...

What is the compression ratio on some these single engine aircraft?

[veenser2000]

I've been using torco 110 50/50 with 91 octane and my motor is 13 to 1. Also my partner who i race with has a 14 to 1 baldwin motor and mixes approximately 70%/30% using the same fuels. Torco 110 is also pretty cheap considering it is 110 octane but will not produce the big numbers you will want for a national race like oxygenated fuel.

[tflatt]

you can look up VP, Rockett or and other racing fuel on the net and get the tech department # and tell them the specs on your quad
and they will give you the mix you need Rockett will for sure that is what we sell and run

[pro-rider46]

okay, heres the real facts on 100ll, i did a lot of research on fuels awhile back. 100LL is 100 octane not 110, yes it ll does stand for low lead. No it doesnt have anti freezing agents in it, unless the owner of the station put it in the gas, and chances are they didnt unless your pretty far north, check to be sure. if you are going to run 100ll on a 13:1 piston with 3mm stroke, i would run it straight, especially cause its only about a buck more than pump fuel.

[bansheemorphine]

Do you think it will have any long term effects running it straight? Have you ever ran it before?

[fastredrider44]

I don't know about the AV gas that yall are talking about, but heres what I run in my motor. 110 sunoco mixed 50/50 with shell v-power 93 octane. I get the sunoco for around 7 a gallon, so its around 3 to 5 dollars a gallon depending on what the pump gas costs.

[loons]

Since when have leaded fuels been bad for these motors? Leaded fuel is just fine. You need 105 octane minimum with anything 13-1 and over. Especially with that stroker crank.

[jersey devil]

Seems like we have many different pros and cons on av gas?

[loons]

I personally would not run it, but that is just me. I run 13-1 compression and run straight c-12.

[Ty's400]

Dragon Racing Fuels- tarragon 110

[ss440ex]

Originally posted by jersey devil
Seems like we have many different pros and cons on av gas?

My understanding of these aircraft engines are only 7:1-8:1 compression,
And that avation fuel is blended for alitude.

Just my thought.....

[chevys&honda$]

100LL--- IS 110 octane

ok, it has a minimum octane rating of 100, but is really 110 octane

I have ran 100LL in (without any problems)

1. 89 xr 80
2. 86 xr 200r
3. 99 warrior
4. 96 banshee
5. 05 raptor 350
6. 07 z400
7. 07 trx 450r
8. lt250r
9. 85 nissan 4x4
10. 97 nissan 4x4
11. 75 chevy nova

and alot more, basically almost everything i have owned

[chevys&honda$]

Originally posted by ss440ex
My understanding of these aircraft engines are only 7:1-8:1 compression,
And that avation fuel is blended for alitude.

Just my thought.....

I will ask my pops you^^^might be right, all i know is he would never steer me wrong and he's a pretty fart smeller..... oh pretty smart feller

[chevys&honda$]

After an hour talking with my dad who is a airplane mechanic, pilot, flight intructor and who has raced sprint cars these are the facts about av gas (100LL)



single engine aircraft comp ratio's in most plane's is between 6.5;1 and 8.5;1 and they do not need to use 100LL but to be extra safe they run it because of the high octane and the sabilaty of the 100LL, they will run on 82 octane.

100LL av gas is safe to use in any engine as long as there is not catalatic converter( the lead will plug it up)

For you guys with high compression 10.5;1 and up to 13.5;1 av gas will be fine, it is 110 octane and the lead in it is good for your valve's it protect's them, the only problem you MAY have is spark plug fouling witch is very uncommon

[Beaudacious]

i did an SG test on AV gas from m local airport and found it is very inconsistent. i always run sunoco 112 leaded and im running 13.6:1 comp ratio with lots of R's no problem people who are trying to cheap out on good fuel for their high comp ATVs should stick to driving their daily driver cars Quads are a luxury

[GPracer2500]

All this talk about octane rating and nobody bothered to specify which type of octane rating they're talking about (e.g. MON, RON, or R+M/2)?? :eek:

We can assume pump gas sold in North America is rated using the average of the RON method and the MON method. If you're talking pump gas, it's reasonable to just say "91 octane" because it's ALL rated with R+M/2. With any other gasoline (race gasoline, aviation gasoline, pump gas sold outside of North America, or even non-gasoline fuels such as ethanol) it could be rated using any of the three aforementioned methods. If one person is referring to MON and another is referring to RON, well--it's apples and oranges.

The easiest way to keep it all straight is to try and refer only to MON. That's the rating most relevant to our hard-working powersport engines anyway.

[vAnS_77]

On the leaded subject. You can run leaded fuel, it actually HELPS your valve seats. It acts like a lube for them, thus helps them....Most dirtbikes run u4.2 I believe in the AMA approved, which is leaded fuel. My general rule about octane is that, anything above 12:1 or 12:5:1 at best. Make sure to use 109 at least.. Most BP locations might have torco which is 110 unleaded. Never use like STP or w/e fuel booster. Only use VP boosters, and name brand racing fuels.