Engine starting and stopping.. 5

[cshmech]

I have a basic(silly!!) doubt about it.. When an ic engine(say 4 stroke) stops, it may stop at any position. When an engine is started, fuel supply and spark is given. But how its possible that it starts to run again in the same direction(CW-CCW)??
I mean, it should run in the same direction, but whats the mechanism which makes sure that engine runs in the same direction??

 

[Surestick]

http://en.wikipedia.org/wiki/Coffman_engine_starter

 

[dicer]

A 4 cycle diesel engine will run in reverse. I have done it.

 

[Lou Scannon]

Was it a mechanical unit injector engine?

 

[dgallup]

It won't run well, the injection is going to be way late.

 

[waross]

A conventional 4 stroke engine doesn't
Explode" at random. The charge is ignited by the spark plug. If the engine starts to run backwards it will be sucking in the exhaust and blowing out the carb. You can't get any fuel that way so it stops instead of running backwards.
Old diesel powered Caterpilars would sometimes kick bak when lugged down badly. They would suck air in the exhaust and blow out the air cleaner. In those days the air cleaners were oil bath. Another scenario was backing up a hill at the end of the day and running down the hill in the morning to start the engine. If you forgot to shift out of reverse before starting the Ccat would start and run backwards. This was not good for the engine for several reasons. The operator did not enjoy the face full of oil he usually got when the exhaust started issuing from the air cleaner.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[budt]

Rolls Royce used a system called "Static Start" insome of their cars. No starter at all. I originally heard about this from an Engineer born and raised in England who came to the U.S. in the 50's. He indicated it worked well even when the engine had been off for dsys.

Static-start engine
Another way to provide for shutting off a car's engine when it is stopped, then immediately restarting it when it's time to go, is by employing a static-start engine. Such an engine requires no starter motor, but employs sensors to determine the exact position of each piston, then precisely timing the injection and ignition of fuel to turn over the engine.[2]

This was from a Google search for "Static Start Engine"

This is the only info I could find on it.


Bud Trinkel, Fluid Power Consultant
HYDRA-PNEU CONSULTING

 

[cshmech]

thanks budt and waross for the information...

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-Harish