a technical discussion, engine efficiency Options

[r_towle]

so, I have been thinking (not always a good thing)
If an engine is basically an air pump, and the objective is to make it as close to 100 percent efficient, why is the exhaust valve so much smaller than the intake valve?

Forget emmisions, forget fuel delivery, just want to understand why this is so...it is so on most engines...

Rich

[Bleyseng]

QUOTE (Brett W @ Aug 18 2005, 11:30 PM)

I don't get it, I mean I understand wanting to work with what you have, but damn. Even I understand futility when it slaps me in the face. For all the time and effort you put into to making the stock DJET or LJET work, you could have gone down to Pull-A-Part and snagged everything you need to convert to CIS. Or you could have gotten a job at night delivering pizza until you could pay cash for a nice standalond Fuel management system. Djet can't handle anything more than controlling a gas leak into each cylinder. You can use a modern system and tune for big cams, huge motors, turbos, superchargers, nitrous, etc. They cost less than the great lengths you will go to to tweak an already marginal system. Don't re-invent the wheel, just to do so. Now if you want to figure out how to make a stock engine run on E85 or french fry grease thats cool.

Don't worry, I will be running a Haltech EFI system on the 2.4l motor. I said I just wanted to try it to see for myself once and for all what the problems are.