tman6919

I've been reading up on ethanol and direct gasoline injection http://en.wikipedia.org/wiki/Gasoline_Direct_Injection for a little while and want to what you guys think will be the future of ethanol in these vehicles. Every year there are more and more vechiles coming out with a GDI engine available or standard.

Audi a4 and vW 2.0t, Volvo 2.0t, Mitsu 1.8, Isuzu 3.5 etc.

they all run higher than normal CR and boast better fuel economy and more power than their port injected counterparts

I read the MIT paper http://lfee.mit.edu/public/LFEE_2005-001_RP.pdf on ethanol supplemented through GDI to aid a gasoline vehicle but does anybody have any links to a straight e85 Direct Injected vehicle running ethanol.

I would think this would be a great future engine. what do you guys think

I know theres a few people that are going to flame for asking but im just curious what the OG's think about this. E85 has proven itself as a great alternative to race gas over here in Colorado and i just want to discuss what the great minds of HMT think would be the outcome of converting one of these direct injected vehicles to run e85

accordepicenter

i have no idea but your avatar is mesmerizing. Where is JD when you need him?

Chris Harris

Direct injection is the hotness because it eliminates the need for the air in the intake runners to swirl and mix properly with the fuel being injected in the runners before passing through the intake valve and into the cylinder. This allows for the best atomization and much less chance of the fuel pre-igniting or detonation as it enters the cylinder before the actual cylinder combustion event should take place.

I think some of the S-series Audi's are running 13:1 compression using High Test and direct injection. Couple that with the octane rating of E85 and you could see some seriously high compression motors with zero chance of knock, even with boost

I think a lot of these Audi's arent using any Throttle Bodies either...figure that one out

Racintweek

please help me figure that out, i'm obviously missing something

Zeniceguycrx

direct injection is the way things are going but running on ethonol alone wont happen, ethenol has less emmisions but also reduces your fuel economy

SDRAWKCAB

I think that statement was made durring the paxonboost bashing....

Zeniceguycrx

Addition of alcohol reduces the heat content of the resulting fuel mixture(alcohol has about 1/2 of the energy content of gasoline. ther fore you need to use a lot more to go the same distance.

aswell alcohol is very volitile and can cause drivability issues, there fore it will not happen

accordepicenter

to make the same power on e85 as gasoline youll need nearly twice the fuel, there is alot less energy released when you burn the alcohol