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Posted by user on August 13, 2009, 2:09 pm
News wrote:

Most don't pass the current acceptable levels, which is why most
vehicles that used to use them such as scooters now use four stoke

Posted by News on August 13, 2009, 2:44 pm

Orbital, Chrysler and others used direct injection and reached emission
levels. Chrysler had a normal wet crank - about 20 years ago!!!!.
Chrysler went against the engine because of the screaming scooter/lawn mower
image, as you demonstrated.  Their engines were very quiet and smooth and
revved to 10,000 without any problems.  All a two-stroke is, is an engine
that every downward stroke is a power stoke, as opposed to every other stoke
a power stroke in 4 -stroke. There are many ways to achieve that. The
largest piston engines in the world are two-stroke diesels.

Posted by harry on August 13, 2009, 6:24 pm

Correct. Pulitzer.  However they have a piston rod and crosshead
similar to a steam engine. They rev very slow. The reverse side of the
piston takes the place of the crankcase & transfer port in the
conventional 2T engine. Crankshaft has "conventional lubrication"
actually from a separately powered oil pump which is started before
the main engine is run (hence virtually no wear on the engine at all)
This overcomes all the lubrication problems, no oil is mixed with the
fuel or burns with the fuel.
Extremely heavy engines but as they are marine engines it doesn't
They have the added advantage that they can run equally well in either

Posted by News on August 13, 2009, 9:40 pm



Posted by clare on August 14, 2009, 1:59 am
 On Thu, 13 Aug 2009 11:24:41 -0700 (PDT), harry


  All the old "jimmy" diesels were 2 strokers too. 3-71, 6-71, 8-71
etc. All with belt driven blowers - and I believe some also  turbo

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