I find it interesting when they brag about less "back of the intake valve deposits" when so many newer cars have "direct fuel injection" and gasoline newer gets to the back of the intake valves.
I have read were some direct injected gasoline car engines still inject a portion of the gasoline (through another set of injector(s)) into the plenum area just to keep the intake valves washed clean, but at a slight mileage reduction.
(The deposits come from crankcase ventilation vapors.)
"The most well-known issue that direct injection has is the injector is located behind the valve instead of in front of the valve so you don’t have that mechanical cleaning of the backside of the intake valve that you would on a multipoint injection.
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Today's Featured Article - Museum Coverage: The Stuttgart Agricultural Museum - by Cindy Ladage. While cold wind was blowing back in Illinois, in Arkansas, daffodils were in bloom, and the Magnolia trees were adorned with fragrant blossoms. Stuttgart, Arkansas was the site of this year's winter Minneapolis Moline Collector's show February 25-27, 1999. The show was held at the Oliver Museum created by Don Oliver, the pioneer of the four wheel drive tractor. Oliver along with Gale Stroh and Kenneth Bull using Minneapolis Moline tractors and parts created what has become known as
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