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Old 02-09-2007, 10:32 AM   #31
True_Brit
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you lot look VERY smart!!!
i dont know what all this means but its interesting
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Old 02-09-2007, 09:01 PM   #32
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Quote:
Originally Posted by Wally
Ok so Ethanol has a stoich afr of 9 compared wth petrol of 14.7. Then a 10% mix of ethanol into petrol would make the resultant stoich afr:

(0.10 x 9) + (0.90 x 14.7) = 14.13

So that means if I'm not running closed loop on my ECU the engine is going to run lean by 1 -14.7/14.3 = 2.8%? This might be a problem if I'm running 5% Co on my turbo engines.

And I guess my power is going to drop even more because pulp is about 33 Mj/litre while ethanol is about 21:

(0.10 x 21) + (0.90 x 33) = 31.8 = 3.8% drop in specific energy.

I guess this lower power would make my engine run cooler?

What do you think Chris?
What's "afr"? lol.

You confused me, but if I look through it more carefully, I'll probably figure out where you got the numbers from.

Based on (my) logic, your engine would have to run at higher RPM to get the same power, and would therefore produce more heat.
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Old 02-10-2007, 02:17 AM   #33
dodgerforlife
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Quote:
Originally Posted by chris_knows
What's "afr"? lol.

You confused me, but if I look through it more carefully, I'll probably figure out where you got the numbers from.

Based on (my) logic, your engine would have to run at higher RPM to get the same power, and would therefore produce more heat.


I think he means Air/Fuel Ratio...but that could be wrong..

I have no idea what all those calculations are for, I hate math.


But simply put, they up the compression ratio in flex fuel engines, which produces more power without increasing RPM when burning E85, and so that you don't burn too much gasoline with the higher compression ratios, they have the computer control the fuel injectors when you're burning a tank of fuel that has more gasoline in it then E85.
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