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Mr. Luddite

On 1/17/2015 11:27 AM, wrote:
On Sat, 17 Jan 2015 10:06:02 -0500, KC wrote:

Back in the 80's when we were discussing this we assumed by now there
would be no starters... The computer would just fire the next cylinder
in line is how we thought it would work...

How would that work? To start an engine you need fuel, air, spark and
compression. If the car had sat more than a minute, there would be no
compression and most injected engines cut the fuel off before the
engine stops spinning these days to mitigate "making oil" so the "next
cylinder" would be dry.

I don't think Scott understands what "start-stop" is.

He's probably thinking of the attempts to cut fuel and ignition to 2 or
more cylinders once a car had reached cruising speed. GM had a system
that cut an 8 cylinder back to 6 or 4 in the 1980's. Didn't really
work out very well.

Some modern engines have a system whereby if the engine starts to
overheat, a couple of cylinders will shut down and just pump air, adding
additional cooling. The engine in my truck is supposed to do that but
it has never had a reason to.