I'm planning on using a 25/75 mix of 110/91 to keep my high compression G23VTEC motor happy and alive.

The thing is, racing fuel is difficult to obtain where I live, but theres an airport nearby. Was just wondering if I could get away with running 25% aviation fuel in the mix instead of racing fuel. Any negative side effects to doing this?

 

Aviation gas or AV Gas, is commonly 100 Low Lead, which could theoretically shorten 02 sensor life.. other than that its fine
Make sure your not getting JET A or any type of Jet fuel...

 

hmmm... I remember hearing about how lead can mess up o2 sensors, but will a 25% mix matter that much?

FYI, the car will be tuned on a wideband, then ran in open loop... the wideband is still there tho, and the display is integrated into the cluster so I know if the car runs dangerously lean or rich.

 

Avgas is measured on a different octane scale. I believe it's got something to do with the different operating conditions (temperature & manifold vacuum & other differences) during the octane testing. So 100 octane avgas might not measure 100 when you measure it by the automotive octane test procedures (RON & MON).

Does anyone know whether to expect it to be higher vs. lower??

 

Well, once you tune it with the wideband - it should be fine. I'd take the wideband out though. Those cost too much to ruin. I'm sure it won't be anything instnat; it should take some time to kill the o2. That - or have a backup o2 sensor.

 

I always thought jet fuel was similar to kerosene?? I'll see what I can dig up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">Avgas is measured on a different octane scale. I believe it's got something to do with the different operating conditions (temperature & manifold vacuum & other differences) during the octane testing. So 100 octane avgas might not measure 100 when you measure it by the automotive octane test procedures (RON & MON).

Does anyone know whether to expect it to be higher vs. lower??
</TD></TR></TABLE>

You are correct. Av gas octane is rated on a different scale than gasolines intended for ground level use. The AV gas also is formulated to burn at higher elevations. What is 100 octane AV, is not necessarily 100 octane ground level.

To run 25% AV gas will be fine. There is a big chemical difference in the makeup of AV gas and "regular" gas. As long as you dont go to 50% or more AV gas youll be fine. The AV gas is different because many small planes dont rev high so the chemical is made to "burn easier" for a lack of better words.

On a side note a gallon of av gas weighs substantially less than a gallon of "regular" fuel.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lewdin’ Incognito &raquo;</TD></TR><TR><TD CLASS="quote">I always thought jet fuel was similar to kerosene?? I'll see what I can dig up.</TD></TR></TABLE>That's true. That's why ariha said DO NOT USE jet fuel.

Avgas is for piston-engine planes.

 

Ah, gotcha.....guess it didn't sink in exactly which kind he said.

 

well if u have an OBD0 engine, it really doesnt matter, but the lead does mess up the O2 so ud have to remove it and clean it every so often. The aviation fuel (100 low lead) burns for a long time, alot longer compared to regular race fuel or gas. i use to run it as an emergency fuel when i couldnt get c-12 just because of my high octane, the benifits it is cheap. around 3.50 a gallon over the VP fuel that runs around 7 dollars a gallon average.

 

you can use the jet fuel if it is a diesel engine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRXnorway &raquo;</TD></TR><TR><TD CLASS="quote">you can use the jet fuel if it is a diesel engine </TD></TR></TABLE>

Yes,but it runs real "dry".You can run a little mixed in.Works good in a kerosene heater though.

Back on topic the lead in av gas has been dramatically reduced in the last ten years.I believe there is only one blend for older piston engines.The blends are really different than land fuels,as are their octane rating scale.If you could see how basic piston aircraft engines are you would be amazed.Very low compression,poor chamber and port design.Basically the engine design was "frozen" in the 1940's.I personally would stay away from av gas.
Glenn

 

well mix about 3-5% 2 stroke oil works fine in the jet a1. or so i have heard