really high % ethenol (96-98%)?

[JDSfastGN]

Has anybody run pure ethanol(or really high%)? Were there any downsides? I run denatured(90% eth anyways i believe) right now but have a friend that can get a 55 gallon drum of 99% pure ethenol for a good price and was wondering whether i should try it out. Thanks for any help or ideas guys.

 

[Alky V6]

It shouldn't be to much different than running methanol. Here are some properties as compared to methanol.
Oxygen content
Methanol 49.9, Ethanol 34.8
Specific energy at stoichAFR
Methanol 3.08, Ethanol 3.00
Boiling point (C.)
Methanol 65, Ethanol 78
Stoich AFR
Methanol 6.45 to 1, Ethanol 9.0 to one

Conclusion: Methanol has it slightly over ethanol, but if you have a way of getting the ethanol for a good price, burn it.

My heads not too clear right now. How will the different AFRs of the two alcohols affect how much of each could be injected? How much gasoline would need to be pulled back with each?

 

[JDSfastGN]

thanks for the reply Donnie. Im interested in the answers to the last ?s you posed as well. I would guess with less oxygen content it would need less fuel...(could easily be wrong here) but maybe not much change would be needed since all i run and am tuned for is denatured. thanks

 

[BDC]

It shouldn't be to much different than running methanol. Here are some properties as compared to methanol.
Oxygen content
Methanol 49.9, Ethanol 34.8
Specific energy at stoichAFR
Methanol 3.08, Ethanol 3.00
Boiling point (C.)
Methanol 65, Ethanol 78
Stoich AFR
Methanol 6.45 to 1, Ethanol 9.0 to one

Conclusion: Methanol has it slightly over ethanol, but if you have a way of getting the ethanol for a good price, burn it.

My heads not too clear right now. How will the different AFRs of the two alcohols affect how much of each could be injected? How much gasoline would need to be pulled back with each?

Based on just that data, it sounds to me that methanol is preferred given its higher oxygen content, therefore it's higher combustion BTU's. Also, not to mention the higher latent heat of evapouration methanol has over ethanol. Seems like a no brainer to me.

Ethanol 904 kJ/kg
Methanol 1109 kJ/kg

B

 

[Pablo]

yeah, i doubt youll notice too much of a difference between the denatured and 99%, at the amount we are using, that last 10% isnt very significant. It also depends on what its denatured with, alot of the time it is denatured with methanol in which case, that last 10% may make you run a richer lambda which basically means that on a wb o2 it will look richer. A tiny bit richer.

You might might have to pull back a little bit of fuel, but I doubt it especially if you are on a single nozzle


I used to run 99% pure isopropyl which is on the opposite end of the spectrum from methanol and ethanol in that it has more btus but it has an insane stoich of like 20:1, to run methanol after I had been running iso, I had to add a ton of fuel, im talking like 10 digits worth on the pe vs rpm fuel map to get my afrs on the wideband back to where they needed to be. Probably 30% more fuel. It sucked though, the latent heat properties of the stuff is pretty weak compared to ethanol and especially methanol