That doesn't sound right. Diesels are 2-stroke engines similar to bike
engines except that they have an intake valve. They need exhaust back pressure
to properly scavenge the cylinder, otherwise excess gas (and raw fuel) would
go through without burning.
.............................................................
I stand corrected, partially at least, I guess diesels are popular in both
2 and 4 stroke variants. I believe that the typical roadgoing diesel, from
pickups to 18 wheelers, is a 4 stroke.
////////////////////////////////////////////
My 3208NA Caterpillar V8 diesel engine in my bus conversion is a four
stroke, but what you may be thinking about is the Detroit 6V92 which I believe is a
"SCREAMER", or a 2 stroke, there are some of them still around, used in
buses, dump trucks and some over the road older trucks, as well as fire and
rescue trucks and marine use. They definitely have a distinct sound to them.
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