OT a little 2 cycle Vs 4cycle

Brian Foster did pass the time by typing:

Also in 2cycle plugs foul real quick.

Emissions primarily ; 2 stroke engines are more dirty as some of the oil put in for lubrication gets burnt. However, they tend to be higher output as they can fire twice as often. Don't know about wear ; would guess that 2 strokes would wear faster, both because of the oil and also because of the output.

Dave Milne, Scotland '91 Grand Wagoneer, '99 TJ

The two cycle crankcase scavenged engine used in snow blowers, model airplanes, chain saws, has nothing to do with two cycle diesels which run dry crankcases and use plenum scavenging with a Roots (most Detroits) or centrifugal (Foden, a few odd Detroits, Junkers Jumo). Two cycle spark engines using direct injection and pressure oiling with synthetic oils are much, much cleaner than they were years ago, which is the only reason they are still allowed in outboards.

You don't know much about Detroit Diesels either. A 6-71 does not have

it may interest you to know that the ONLY Detroit Diesel engine meeting the most stringent new heavy vehicle standards for emissions is the 6V92T DDEC.

They stink, they smell bad, and they smoke. They have a bitch of a time passing the smog laws of pretty much everywhere, and they stink, smell bad, and smoke. Mixing gas and oil is not biggie, the major manufacturers figured out a very long time ago how to meter the oil into the fuel supply, so the operator simply adds gas to one tank and oil to another, and the rest magicly happens all by itself. But, none of this gets around the stench, the stink, and the smell. Then, there's the noise.

Where do you mix the oil in a cell phone?

How much you want to bet?

No, I was just off line. I had other stuff to do like work.

"Buttons" are used in the Cummins PT system. Detroits have a unit injector that is connected to a shaft and bellcrank affair that is operated by a rod off the governor. "Running the rack" refers to setting the injector slides up so they are all even in travel so all cylinders get the same fuel. When the engine is converted to DDEC the rack and its linkages are removed.

I'm told the very first Series 60 engines have little flat areas in the casting so that if DDEC hadn't worked out they could have went mechanical via field conversion.

LOL Don't say that in a room of avid snowmobilers. Theirs nothing like the smell of a 2 stroke on a crispy -15 degree C winter morning. AHHHHHH :-) Can't wait ( beats this +32C humidity crap)

It's amazing the HP that comes out of my little half liter

Along with everything else that has come up, two stroke engines may produce more power per pound, but they have a very narrow power band. I believe this applies to the Detroits as well, that's why they have like 400 gears. It is also why they are used in things that run at one speed, usually wide open (chainsaws, weedeaters,etc). Snowmobile pulleys keep the engine in that band as long as possible. The other advantage of the two stroke is that they can run at any angle.

Uh, that might *really* be an advantage in an off road situation. :-)

-- Old Crow '82 FLTC 92" 'Pearl' '95 Jeep YJ Rio Grande SENS, TOMKAT, BS#133, DOF#51, MAMBM

Nah, I just run it slowly through a really deep water crossing. Still it'd be nice to turn it over and have it still run.

-- Old Crow '95 Wrangler Rio Grande

The other advantage of the two stroke is

This feature would seemingly make them ideal for a Jeep. Of couser, a Jeep with 400 gears would suck.

Clean it out, or empty it out? Either way, I'm not clear on what the down side is.