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Thread: E85 Fuel
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16th January 2008, 16:40 #1
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E85 Fuel
Corvette GT1 announced they will be using E85 (85% ethanol) fuel for this season. E85 has a higher octane rating and therefore the engine will be more resistant to knock. This should allow them and others using this fuel to run higher compression and more aggressive tuning (timing..etc). However, there is roughly a 30% degredation in fuel economy. I wonder how they will account for this ? Will larger fuel tanks be allowed or just more pit stops and make up for it with the extra power ? A dilema for endurance racing.
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19th January 2008, 08:12 #2
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Will they run E85 at LeMans, too?
"You can mop the blood up later." - R.A. Lafferty
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22nd January 2008, 22:07 #3
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Higher compression means if you're running 10:1, and you can go to 16:1, you use 10 litres of air per litre of fuel. In 16:1, you use 16 litres of air per litre of fuel.
In Christ,
Bobby
Deuteronomy 31:6-8
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23rd January 2008, 15:26 #4
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Originally Posted by BobbyC
1. Compression refers to the reduction in cylinder volume during the compression stroke. 10:1 means that the full air charge into the cylinder is compressed to 1/10 its volume during compression. It has nothing to do with the fuel/air mixture.
2. An engine needs to maintain a proper fuel/air mixture (in chemistry we call this the stoichiometric ratio) so raising the compression actually requires the engine to use more fuel. If the compression increases from 10:1 to 15:1 and you maintained one unit of fuel per 10 units air (it doesn't matter what those units are) in the 15:1 cycle, there would be a drastic reduction in the fuel/air mixture which would lead to a less powerful engine. The fuel/air mixture must rise with compression, though it is not a perfect 1 to 1 scaling.
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15th March 2008, 22:02 #5
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Since when does stoich change with compression? I've been taught that stoichiometric (with pure gasoline) is 14.7:1 at 6:1 compression and at 14:1 compression.
racing-reference.info/showblog?id=1785
9 Simple Rules as Suggested by a Nerd
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16th March 2008, 16:30 #6
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Originally Posted by call_me_andrew
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16th April 2008, 01:56 #7
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I was talking to Ron Fellows last Thursday, and he was telling me that AMLS allowed Corvette Racing to increase their fuel cell size, due to the reduced fuel efficiency.
They will run the regular race fuel, not the E85 at Le Man.
One last thing he told me that I found interesting ... the weight of the fuel ... E85 is heavier than the regular racing fuel.
Mark
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16th April 2008, 06:31 #8
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Originally Posted by CDN_Wolf_eh"You can mop the blood up later." - R.A. Lafferty
Did Jan Solans get 3 points for his 8th place at the end of saturday? Wikipedia and WRC site shows he didn't, eWRC shows he did.
[WRC] Vodafone Rally de Portugal...