Triple engine power - must be a catch

[Tuckerbox]

Say you tripled the compression in the engine and somehow kept temperatures to the same level, what sort of effect would that have on the power? Double? Triple?

Actually, you can't just double your boost with a turbo and expect that, so I suppose this wouldn't be any different.

[Billzilla]

Say you tripled the compression in the engine and somehow kept temperatures to the same level, what sort of effect would that have on the power? Double? Triple?

Actually, you can't just double your boost with a turbo and expect that, so I suppose this wouldn't be any different.

Yep.
It's a non-linear thing, so three times the compression would make much less than three times the power. Lots of heat though.

[walkie]

you'd want to keep a close eye on your ethanol guage

[oldcorollas]

they say it is to prevent spontaneous ignition....

so it is just a direct alcohol injected turbo motor concept "to reduce gasoline consumption".....

lucky the "technology review", which is pusblished by MIT, published a story about an MIT researcher using conventional technology in a new and more expensive way, otherwise we would never know about it :p

[2JZR31]

WOW!!! MIT has finally caught up to the backyard mechanics at PF. Only difference is we inject the alcahol/water before it gets into the combustion chamber.

[bv]

The whole point of big capacity engines, is that they can be relatively lazy, whilst having some modicum of efficiency.

errr, what? im confused

I thought that was the point of turbocharged engines they can be small capacity when off boost for effeciency, then perform like a big donk when on

[GTSBoy]

errr, what? im confused

I thought that was the point of turbocharged engines they can be small capacity when off boost for effeciency, then perform like a big donk when on

Yuh, because big engines have all the ring and bearing friction losses whether you are puddling or belting. Big engines always cost more in losses to make the same power (at the same level of technology that is).

[GTSBoy]

Thing that gets me with this is that they say they are going to direct inject a very small amount of ethanol which will magically cool the charge, and they are going to inject the petrol in the normal fashion, which I take to mean with port injectors. So for port injectors to work, the petrol must get injected at the piston is falling, or at latest as it just starts to rise after BDC, so that the fuel is all in the cylinder for the entire compression stroke. I cannot see how you can whack lots of compression + boost + a very small spot of ethanol, which would have to be injected after the petrol fuel is in the cylinder and not have it diesel with the piston 3/4 of the way up the bore. It must be a pretty talented squirt of ethanol. Let's face it. The water/meth injection boys here squirt in absolutely massive volumes of water to control detonation. Almost enough to extinguish the flame. How can a thimble full of ethanol do it?

[2JZR31]

I didn't see any CR's mentioned?