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I understand from another poster that catering oil can contain a flame retardent. Can this effect ignition and reduce efficiency?
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You might find it easier to get a knowledgable answer over on biodiesel.infopop.cc - there are a lot of people there running cars on used or fresh vegetable oil, and there is a UK section as well. Someone's bound to have encountered it. If you get a response, please post the relevant information here as well.
andymc
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It would certainly make sense to have a flame retardent in the oil for cooking use; but I don't think it would have much effect in a CI engine.
Yeah; let us know how you get on!
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groups.msn.com/honestjohn - Pictures say a thousand words.....
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Hi Pullgees. I run a Pug 309D on new and used veg oil. I would esitimate that there's probably roughly a 10% drop in power in both cases. I believe the reduced power is a result of veg oil's naturally lower cetane value - diesel's equvalent of octane. Veg oil has a cetane roughly around 42, whilst diesel is over 50, depending on who's fuel you buy. The reduced cetane means you need to burn more oil to get up steep hills etc!
I boost the cetane rating by the addition of around 0.5% by volume of 2-ethyl hexyl nitrate. A fancy name for a chenmical that's widely added to diesel by manufacturers to boost the cetane rating. It's not a cheap substance to buy, so there's a cost / performance trade off. After a bit of experimenting, I get around 50mpg, at a cost of around 57p/litre (if using new oil), with slightly better performace than dino-diesel.
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