Can't Hit 10 PSI after putting Airplane Fuel!

[diegom6]

Before putting 5 gallons of L100(Airplane Fuel) {with less than 1/4 of tank} I was runing in my second stage(boost controller) 10 PSI, when I filled the with the gas, I warm up the engine after that, and made a ran......WTF??? my boost gauge showed me 7-8 PSI and noticed the lost of power due the less boost.


I stoped the car, turned up the boost controller to see if I could have more boost, nothing, stayed there, two time I did it.

I arrived at home, checked the BOV valve, re-adjusted it, nothing.... then with friend of mine dissambled the wastgate housing part ( Internal Wastgate) and we noticed that the hut sometimes the valve wasn't closing enough, we tight the hut, and then aseembled the housing back. Now is working good and closing good. Then I tighted (again and more) the wastegate.

Did a run, nothing....still in 7-8 and sometimes I think 8.8 or 9 PSI, the power wasn't like before filling withte airplane gas...

I took off the vacumm from the wastgate too see if the trubo starts to charge like crazy.... guess what! Nothing still in those damm PSIs

I checked all the charge pipes, and all are very tighted, also I don't hear any air leak.

Then went to the street ilegal races, and made two runs againt my friend's M3 E30, I smoked him even when I lost power (before the fuel), did another ran, when the stop light was green we launched,...the my engine failed, WTF????? sounds like trik tri k tirk tirk or something like that....and then I went slow due the problem...

Today I will take out the oil pan and check the metals..

The Idle is still good, without noise, but when I hit 1800 RPM or so...start to make nosie this trik trik trik sound....

Oh, BTW::: I added yeaterday the local fuel (97) to see if the problem was the special fuel, but even with that couldn't get the problem...

Any suggestion?
:cry:
This is very wierd!!!!

[bimmerjim®]

pull the valve cover first, sounds like you have a broken valve spring.

[TriFlow]

I break rocker arms all the time and I dont even have a turbo yet.

Good luck

[BoostMe]

is it jet fuel or piston engine fuel

[diegom6]

is it jet fuel or piston engine fuel

don't know what fuel is exactly, my friend told is made for the light airplanes (piston) engines.

Well, this is what I found, main bearing(metal) ROD N#1 is shitt, has wear, and must be replaced, hofully, the journal on the crank isn't damage, looks clean and soft...the 6th cylinder in the rod it's very good, looks like new...then I found the second main bearing of the crank a bit of color bronze,(you know what I mean, I don't have the word and time to look in a dictionary).....

I'm taking out the rest, we will find more surprises sure, hope not...

So, why the first bearing rod failed? Also the metal have "Axial" play, I mean it doesn't fit precise in the "clamp" of the rod...but hte rest looks find...

I took two pics with a old DIgi Camera, but it doesn't look good, horrible resolution...must be in the garbage, the other camera is gone, went to a trip...!

[bimmerjim®]

im wondering that too. i wasnt ecpecting to hear crank damamge.. did you hapen to run low on oil? low on oil pressure? that would explain the turbos low boost pressure (no lubrication for the turbo, it wont spool..) and the main baring failure. maybe if the oil pump went out, and you had no way to notice, AND, the oil presure idiot light didnt come on, then that may have been the problem.

but, also, if the gas you put in was low octane av gas (heavlay leaded. the equivelent of 82 octane here in US) then you could have goten some detonation and squashed the main barring.

see, airplanes tipicaly run a lower octane than automobiles. lower octane is acutlay more volitile. it burns faster and produces more heat. thus, making more power. but it dosent go well in cars. most airplane engine run only 4-6 degrees total advance, most cars run 24-32 degrees total advance. thehigher the octane, the slower it burns. so, the more you can advance timing witohut detonation.

maybe i can help you buy a 55 gallon drum of c16 (low lead 116 octane race gas) i know a few supplyers. its about 6 bucks a gallon, but you can mix it with your pump gas to make your overall octane rating higher safely (as long as you have removed your catalitic converter) although i dont know what shipping would be to south america.. let alone customs laws..

the problems seem to stem of the gas you put in, so im thining is some reaction...... mechanical related to the gas.

[diegom6]

Maybe is th eoil presuure, maybe wasn't enough press who knows...the turbo shaft runs soft, it's ok... the oil level was/is normal...Castrol RS Syntetic

I will return to normal gas cars, I won't do idiots things with out asking first...no more this week I will let you know what exactly is wrong..

[Jay Stock E30]

I'm sorry to hear that man, hope you get it back up and running fairly easily

[kingmanjr00]

hey there...i am a pilot and maybe can shed some light on this situation...100 octane aviation fuel is normally, not always but usually, low lead...i've always heard that you should not put it in your car...i don't know if the low lead hurts anything but that is what i have always heard...i'll check around and see if i can find anything else out...

[mops]

around here AV gas (aviation gas) is cheaper to buy than best pump fuel. it has about 120 octanes, but it is heavy leaded (i.e. kills oxygen sensors). Many ppl use that fuel for drag strip. yes, airplane engines run low advance, but aswell they run low rpm's... they rely on torque not hp to make power.

bugger about the engine eh... i hope you get it together....

I'll be rebuilding my m20 within newxt two months... just gotta sort this bloody radiator...

[iXer]

Oh holy old thread revive.

[diegom6]

Oh holy old thread revive.

holy! x2

ohh, back days when my m20 was stock except for the turbo lol

-Diego

[Gabi_323i]

oh damn :D i read the whole topic and i really thought that you busted the 3.0l #-o

[87-325iC]

me too

[Reynard38]

Most of the Avgas available here in the US is 100 octane. It is called low lead, but acutally has quite a bit of lead in it. Aircraft piston engines typically run pretty high compression, but very low revs (2700 RPM or so).

[XuRacing]

what! jet fuel? DONT USE THAT! i have had bad experiences with it. It burns way too hot. Whats your EGT reading out?