Avgas

[Dearlove]

i know there is a few topics on it already but they are old and i was wondering if anyone has been running straight avgas without killing the engine,

i use to run my old civic on it, but it burn out all the exhaust valves, but doesnt the rb26 have sodium filled exhaust vales or something??

not too worried bout the o2 sensors as they're prob already dead

not doing it for performance gains, just coz i get get hold of a bit here and there

[GTRsean]

Umm, don't run it straight, best to mix with petrol 50:50, then ignition timing can be advanced (tuned to suit of course).

Don't run a cat converter, it kills them too.

It's not street legal....

That's all we have found.

[VB-]

can you get a reliable source of it? you need a pilots licence to buy it *legally* now afaik. dunno how stringent it is though

[Dearlove]

yeah i dont exactly 'buy it'

[VB-]

in that case, decat and find what mix works best for u

[R31Nismoid]

Just because you can get it doesn't mean you should use it

And certainly not straight...

Honestly not worth the effort of the retune and what not for odd occasions

[Dearlove]

i wouldnt re tune for it, prob use bout 1/2 1/2 mix,

[R31Nismoid]

No point then really to be honest without getting a proper retune to allow/add i timing and so on dude...

[Dearlove]

yeah i realise that, its more for not having to spend as much money on fuel,

[Keeper]

a few of the boys at work mix it 50/50 and throw in in their motorbikes, saying that people usually take it from the slops tank, so make sure you drain for water content before adding to your tank.

it does require a tune to run properly, i stay clear of it personally unless you can guarantee a sufficient supply to mix half half all the time and tune to suit.

[rob82]

Its fine to run without mixing it but it may render your cat useless - but it wont destroy it.

[Cjmartz2k]

Yes it will destroy a cat. It's leaded and it clogs up the cat. Makes it overheat to the point of glowing red and destroys it. I've seen it happen.

Dearlove, you might want to look into water/meth injection as a cheap option for the net effect of higher octane gas. Is it something you want to run all the time or just for track nights? If just track nights, you could also make some of your own high octane brew with something like tolulene (sp?) of xylene. Has the effect of taking US R/M+2 93 octane gas up to around 98 octane. What do you guys have down there? Av gas is only like 106 or there abouts IIRC.

[SDEWY5]

lol 106? id b shitting the gear if i could get my hands on some of that...if its tuned on 98 then 106 is going to make fkn absolutely no diff other than protect ur engine slightly from det...waste of time... rather stick 100 shot up it then tune it on that crap...at least it would have some valuable effect

[Dearlove]

the avgas i'd use is 100/130

100 octane rating when lean, 130 when rich, or so they teach us at tafe...

[blind_elk]

Because it contains lead, it is illegal to use it in a car complied to run unleaded. It will kill the O2 sensors, and the cat. (and de-catting is also illegal).

Before you get caught with it in the fuel tank, make sure you have a very good relationship with your local bank manager.

[VB-]

^ read post #4 again, then think about the relevance of 'legalities' in this case

[gotRICE?]

I would assume hes not stealing it or he wouldnt have said anything at all.

Makes the inside of your exhaust red. Then everyone thinks you have a rusty one aaoouu.

[rob82]

It doesn't kill 02 sensors - we have an XR6T that has covered thousands of kilometers on avgas without destroying anything - mind you it doesn't have a cat. And as for red exhuast thats crap. It leaves a white residue in the exhuast system thats why it makes reading plugs more difficult too - as they appear alot whiter ie- hotter than what they actually are.

[gotRICE?]

Gee maybe they painted it red then. my mistake

i just mentioned it because a friend of mine run it in his Supra for a while and the inside of the tip on his cannon muffler went red.

I love SAU. Its the one place to go when you want to make someone get all uptight.

Keep it up.

Edited March 24, 2009 by gotRICE?

[Dearlove]

HAHA, no im not stealing it.

i work in the aviation industry, thats all

and i know a bit bout the fuel,

it burns slower than 98 therefore increasing its detenation charateristics, and in turn it burns hotter, and killed my poor litle civic engine's valves

it doesnt make the exhaust go red but when running really rich i have seen it going 'sort of white' but mostly black

its got alot of lead in it, say the old leaded fuel for cars was like 0.05g of lead or something, avgas is about 6g (my numbers my be a little wrong) thats why they are trying to get rid of it just like in cars

it has a lower reid pressure, cant be bothered explaining, plus it doesnt matter if your running it in a car.