What is the lifespan of 98 PULP ??
I have heard that premium has a very short lifespan.

The car in question has half a tank of 2 1/2 year old premium, which is smelling like paint varnish not petrol anymore.
The car is pinging under load and is totally gutless.
Is this due to the premium being off ???

The motor is a high comp L18.
Flat-top forgies with a 39cc L16 head.

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1975 P610/180B SSS ex PRC3 Rally car (parts car)
1974 P610/180B SSS (parts car)
1972 P510/1600 Currently sitting untouched
1977 P610/180B Wagon Daily Driver

not too sure about lifespan, but my old man had a Yamaha FZR250, and we would refill it approx every 5 days, and there was a huge difference in it, would start heaps easier, run smoother, better pickup, so thats my experience with it!
i think the fact that these things are such small motors and very sensitive make it very noticeable, much more so than a car.

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Dave W

The 1600

Recommended traders: Nissanman, pro240c, 2door510, Datsport, mkyle, Green510, Um_510, jdmdatsun510, Ludachris

I've heard anything from less than 1 week, to up to 2 weeks. Anything over that, and it is probably cactus.

So, a new tank of fuel could be your answer! (Or then again, it might not...)

i have heard that it last for about 3-4 days i have also heard that petrol has a life of about a month

ANY fuel over a month old is stuffed.

i can't believe you can actually run your car on 2? y.o. fuel!!! you must have great spark!!!!

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frankenstein projects R us.

The Republic of Western Australia -
Propping up the Nation's Economy since 1901.

its got to last more than a week surely.

by the time they manufacture it and then take it to the fuel station, then it sits in their tanks until its mostly used up!

in the country aswell they probably dont see a refueling rig too regularly.

has to be a few months at least. some facts are needed on this i think.

BP wrote

more fuel reading:

http://www.fefcholden.org.au/techinfo/B ... ET2002.doc

I have a lot of experience in the hydrocarbon industry working on rigs and for bp petroleum, and i don't see how petrol can change over time?

hydrocarbon is hydrocarbon? it does not decompose or change state
The only thing i think it could do is separate. Longer chains to the bottom and lighter shorter chains to the top.

at BP we used to have tanks of AVGAS that had not been used or drained for years it was though agitated every fey days, and then one day they would be piped to the refilling depot.

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Circuit Race 1600 in the build

Yeah I am suprised to.
I popped out this arvo and spoke to a friend that is a mechanic, and he said he was suprised it would even start.
Thats a S2 Bluebird dizzy for you.

I will be removing the tank tomorrow and draining all the fuel out, then a trip with the jerry-can to the local BP should sort things out.

It realy does smell like varnish though. I smelt the petrol from my daily driver and it is nothing like it anymore.

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1975 P610/180B SSS ex PRC3 Rally car (parts car)
1974 P610/180B SSS (parts car)
1972 P510/1600 Currently sitting untouched
1977 P610/180B Wagon Daily Driver

AVGAS aint the same as a PULP lampy. PULP has lots of chemicals in it that AVGAS doesnt, I believe this is why the stuff "goes off".

Trust me, the stuff in my tank is NOT PULP anymore.
I have a tank of varnish.

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1975 P610/180B SSS ex PRC3 Rally car (parts car)
1974 P610/180B SSS (parts car)
1972 P510/1600 Currently sitting untouched
1977 P610/180B Wagon Daily Driver

this sniffing petrol sh*t has me feeling all light headed...

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frankenstein projects R us.

The Republic of Western Australia -
Propping up the Nation's Economy since 1901.

My head is still spinning, I think I need another hit.

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1975 P610/180B SSS ex PRC3 Rally car (parts car)
1974 P610/180B SSS (parts car)
1972 P510/1600 Currently sitting untouched
1977 P610/180B Wagon Daily Driver

i just did some researching in my textbooks and found out that PULP does contain more additives than normal unleaded.
you we right Datsss73
It is the oxidising of these additives which can lead to gunk in your datto tank
quote outta my textbook
Oxygenates are organic compounds containing carbon, oxygen and hydrogen. They are added to petrol as a blending component and to increase octane. They improve combustion and reduce carbon monoxide formation and hydrocarbon emissions. Oxygenates include alcohols (e.g., ethanol, methanol) and ethers (e.g., MTBE - methyl tertiary-butyl ether). Some oxygenates such as ethanol can increase fuel volatility if blended in high concentrations and others, such as methanol, can be corrosive. Unlike petrol, all oxygenates are readily soluble in water.
If excess oxidation occurs it can result in the formation of gums and deposits, affecting whether engines run reliably and efficiently and give years of good service.

source
fundamentals of hydrocarbon processing vol 2
author- Sam Field

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Circuit Race 1600 in the build

Thats why your leaded AVGAS was good for years, it has none of the chemicals that is in modern PULP.

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1975 P610/180B SSS ex PRC3 Rally car (parts car)
1974 P610/180B SSS (parts car)
1972 P510/1600 Currently sitting untouched
1977 P610/180B Wagon Daily Driver

I was talking to the owner of an auto elec shop about 2 months ago. He commented on how quickly Shell Optimax 98 goes 'off' now. From what he could tell it only seems to last roughly 30 days from the refinery now. He suspected they might have changed the recipe?
He does a lot of performance work, and quite often analyses cars in-shop.