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Old 07-15-2005, 11:36 AM   #10 (permalink)
moman
4.6 Liter Northstar V8
 
Join Date: Mar 2005
Location: MO & FL
Posts: 1,923
Re: Direct-injection engines make a comeback

Quote:
Originally Posted by Bvonscott
Sounds complicated to me. Anyone have a "lamens terms" description of how it works? Or a website?
It's quite simple. The fuel injector in screwed into the cylinder like a spark plug. Air comes through the intake valve, mixing with the fuel in the cylinder.
Conventional fuel enjection (port/sequential) has the fuel injector positioned above the intake valve, and fires when the valve is opened, in essence mixing the air/fuel mixture slightly above the valve.

The drawback I see is having another screw hole in an aluminum head. There are enough helicoils done now removing spark plugs every 5 years. Try removing a fuel injector after 15 years!
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1997 Chevy Silverado Ext cab Z71 - 5700 V8
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