rexjan(at)bigpond.com
Guest
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 Posted: Sun Apr 16, 2006 8:08 pm Post subject: Ethanol Fuel |
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Well Herbert re your posting on Ethanol in our fuel. I also have a Blue Head 582. I used to race Karts and we used Methanol in some classes of racing and I know the result in a 2 stroke. I also used 10% alchohol in petrol in in a 5 litre Chevy in my Hydroplane at one stage when racing fuel was not available for a short period here in Australia.
In the Hydro the only trouble was a hell of a white mess to constantly clean out of the Holley carb but in a 2 stroke it is very bad news indeed. It absobs moisture and causes pin spots of rust on the needle bearings so that they soon fail. A big improvement was able to be made by runnining our motors for 5 minutes on straight petrol and mineral oil after the race meeting. Synthetic oil although a very good lubricant also absorbs moisture. While it is in a warm motor the moisture just evaporates and all is fine but left standing it is a problem. This is why you can buy a mineral/synthetic mix.
Also note to run our motors after the meeting on petrol we had to screw in our adjustable carby jets as a motor needs 3 times the flow on alchohol as petrol.
I wasn't really aware of the problem with the alchohol and fibreglass tanks but obviously this is another aspect that is a problem. Also the aluminium fuel lines and seals.
Trying to run Avgas in our 2 strokes is not good news either due to the lead.
It seems to me that our 2 strokes days are numbered and there will be the other issues as well that apply even with a 4 stroke replacing our 2 strokes like the aluminium fuel lines. I guess there will be some answer re that white corrosion build up in the carby if we are all going to get this junk fuel in our cars [ perhaps plastic carbs like on some lawn mowers ] but I for one find it all a very big worry and my 582 is still only about 100 hours.
Perhaps with more discussion we can solve some problems but I can't see we can solve them all. We used to run our Kart motors on petrol at the end of a meeting to clear the alchohol and synthetic oil but we won't even have this option with our planes because where will we get the straight petrol to do it.
The last thing we want is problems with our engine in the air. It's bad enough on the ground. It would be nice if avgas without the lead came on the market to solve the problem but the 4 stroke guys want it and there is not enough fuel used by us 2 strokers to warrant it.
Rex
Australia
MKIV Kitfox 582
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