Petrol Puzzled

[alanMember]

have used that 100 octain stuff from united made the bike ktm300 crack and worked real well in the pw 50 young bloke was on fire if i use shell optimax or 98bp stuff in the pw or jr80 they foulplugs real fast and run like shit but the 300 goes alright .thats just my experiance am no chemist no nothing about fuel

[Bob DowsettMember]

I knew it
Noah told me it was crap years ago

:laugh:

Now i need some clarification

If you were using higher lower octane fuel in carbies this would make a difference in peformance depending on how your engine was designed ??

In Finjected weapons wouldn’t you be able to manipulate both timing and injection as well as your heat rating in your plug to compensate
so using higher octane fuel would be a waste of cash ?? :unsure:

I want some 100 for josh’s pee wee :woohoo: where do u get it :laugh:

[Bob DowsettMember]

Won’t altitude play a roll in all of this as well

Why don’t we just use avgas and stop rooting around with all other inferior products :laugh:

[Scott SouthwellMember]

Problem solved.

Now would it be better to charge from old coal power stations or coal seam gas?

[Bob DowsettMember]

Scotty wrote:

Problem solved.

Now would it be better to charge from old coal power stations or coal seam gas?

I would throw some low octane fuel on it at a high altitude position and watch it burn a slow death

cause its orange

[Steve WyethMember]

Rob400 wrote:

Great topic could go on about it for hours but wont.

Everyone to there own on this one,

It is no different to anything else you can buy for your machine there is cheap on there is good.

Low octane crap is not for me 👿 👿 It will detonate earlyer and under less compression in your cylinder. No good for your engine componates or your economy.

Just my 5 cents worth Premium all the way for me. :woohoo: :woohoo:

Cheers
Robert

Lowwe Octane will detonate earlier. However, I used to run 91 Octane in my 300 with a high comp head and lean jetting with no ping or det and on the hottest of days. So, that being the case, using anything above that Octane level it just pointless.

People like to think their enduro bikes are hardcore race engines, when in fact they aren’t really. They run relatively low compression levels compared to other forms of motorsport of the purpose of reliability. You would have to have jetted your bike pretty poorly to get serious det with common fuels.

As for the car, I use E10 in my supercharged car and have done for the entire 3.5 years I’ve owned it, never a drama and I get excellent fuel economy. Admittedly I do get better econonmy by about 30Km per tank if I use 98 fuel. Do the maths though, for the extra 30Km I’m getting I would be better off buying more E10 than filling up with 98 and 20c/litre more for the whole tank.

Bob – The beatuy of fuel injection is that you can adjust for higher rated fuels generally speaking. However, FI on dirtbike is so basic is doesn’t compensate for much at all. It doesn’t even use closed loop FI for larger throttle openings so it doesn’t correct for fuel/air ratio’s (at higher throttle opening) based on the O2 level in the exhaust product.

They also don’t have knock sensors as far as I’m aware so can’t retard ignition when detonation is present.

[Matt BakerMember]

Don’t forget also that whats written on the bowser and what is actually in the tanks is not always the same thing.

[scott bockingMember]

LC4skin wrote:

Don’t forget also that whats written on the bowser and what is actually in the tanks is not always the same thing.

Or the calibration of the bowser. I managed to get 11.8 litres in a 10 litre jerry can at a local servo. :dry:

STM

[Matt BakerMember]

singletrackmind wrote:

LC4skin wrote:

Don’t forget also that whats written on the bowser and what is actually in the tanks is not always the same thing.

Or the calibration of the bowser. I managed to get 11.8 litres in a 10 litre jerry can at a local servo. :dry:

STM

I managed to get 15 schooners in a 12 schooner drinking session :laugh: :laugh:

[Steve WyethMember]

singletrackmind wrote:

LC4skin wrote:

Don’t forget also that whats written on the bowser and what is actually in the tanks is not always the same thing.

Or the calibration of the bowser. I managed to get 11.8 litres in a 10 litre jerry can at a local servo. :dry:

STM

Or the specifications of the manufacturer. I measured 1.2L extra capacity in my old 450 fuel tank using water and measuring jug. I suspect they quote on the basis that it isn’t filled to the brim and it’s better to say 10L and actually be 11 as opposed to 9.

EDIT: To add that I was putting water in a spare tank that had a hairline crack (to measure the level at which it started leaking), not the one I was using on my bike :woohoo:

[scott bockingMember]

LC4skin wrote:

singletrackmind wrote:

LC4skin wrote:

Don’t forget also that whats written on the bowser and what is actually in the tanks is not always the same thing.

Or the calibration of the bowser. I managed to get 11.8 litres in a 10 litre jerry can at a local servo. :dry:

STM

I managed to get 15 schooners in a 12 schooner drinking session :laugh: :laugh:

Were you drinking E10 or premium? :laugh:

STM

[Matt BakerMember]

singletrackmind wrote:

Were you drinking E10 or premium? :laugh:

STM

Super Tooheys Premium New, plus a few power additive Scotchies just to stop the pinging.

[Adrian SnowdenMember]

So genius’s of petroleum products:
Some time back I was running late for a ride and filled the drz with e10 instead of diesel. Bike ran great all day with not a problem. After the ride it sat in the shed for about ten days and when i tried to start it no go it just coughed a few times and died. I was advised to drain the tank and carby as “the ethanol settles out of the fuel and sits in the bottom of the tank which is why it wont run”. I did that refilled it with the normal fuel and it went straight away so I assumed the advice to be correct.

Is the above acurate or folklore with a happy ending?

[Steve WyethMember]

Yep it can settle out the Ethanol has a different density to the remainder of the fuel products and since they aren’t chemically bonded if left untouched for a while it will settle. Not much different to 2t oil in fuel really in that regard.

Yay for folklore!

[Author]

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