Author Topic: Petrol oil ratio  (Read 14930 times)

RalphT

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Re: Petrol oil ratio
« Reply #15 on: February 05, 2010, 10:56:57 AM »
This fuel is for jet engines and is not generally for road use, the tax is different.  I don't think that Mr PC Plod would be very happy with you using it in your Transit :'(
1960 Messerschmitt KR200

marcus

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Re: Petrol oil ratio
« Reply #16 on: February 05, 2010, 12:53:15 PM »
Different tax     >:(   : does that mean Airport Tax + Boarding Fee and Luggage Surcharge?!
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RalphT

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Re: Petrol oil ratio
« Reply #17 on: February 05, 2010, 04:23:59 PM »
These are all things you need to consider if you want to go flying ;D ask Michael O'Leary ;D

I'll stick to 25:1 regular two stroke mix in my schmitt until I know what bearings etc it has.
1960 Messerschmitt KR200

Big Al

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Re: Petrol oil ratio
« Reply #18 on: February 06, 2010, 08:51:12 AM »
At the risk of being pendantic -

Avgas is expensive as it is high octane fuel formulated for aero piston and wankel engines, things like Lycoming engines fitted to such as Cessna. Gas turbines will run on it but I would think that it would be over spec.

Kerosene is high grade parafin for aero turbojet engines commonly fitted to long haul airliners and such. This is the cheap fuel as it attracts low taxation and will run a diesel engine. I think Avgas would fail to work in a diesel engine as it is something like 7 star petrol. I suspect there are folk with private planes who are using the low cost and access to run their cars on kerosene but of course it does not carry the additives needed for a car engine. Therefore they are probably running a % mix or alternating tankfuls to avoid a failure. You can smell it in the exhaust too just as veggie oil smells like a chip shop went passed. Not sure if Avgas makes such a noticeable smell on being combusted.

Was it in fact kerosene that was the smell the personnel carriers were making. It is more the smell of airports. It maybe that the Army has dispensation to run on kerosene to save us money. Diesel engines will run on all sorts of things, olive oil, coconut oil even engine oil as you will find if you overfill the sump on some designs as it gets into the induction and bypasses the throttle control going to max revs spontaneously! Using a diesel for the army vehicles makes sense as the engines can use many differing fuel sources during the confusion of a battle rather than getting stranded for the need of specialised fuel.

Two strokes do not need fuel additives as they come in a bottle called two stroke so if a fuel will burn in the engine that is good enough! We have had a Schmitt run Avgas round Shoreham Airfield quite happily but it is not economic. I like the low tech of the two stroke but the price is paid if you want to increase performance as they are much harder to tune than other types of engine. Just as computer maping is cracked which would have made life so much simpler two strokes seem to be out of fashion.
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