[DML] Re: More on idle speeds

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

There are a lot of reasons the idle speed is set where it is. Some are
related to smoothness of the motor when idling, some are emissions
related, and a BIG reason is so when you shift into gear you don't
always stall out the motor. On an automatic it is affected by the
"creep" of the torque convertor. BTW that is another weird point. The
idle spec for the automatic AND the 5-speed is the same. Very strange.
On just about every other kind of car I can think of there is ALWAYS a
different idle spec for the auto idle (usually a little faster). You
will find the idle is also always below the point at which the
mechanical advance starts to come in for the ignition.
David Teitelbaum
vin 10757 


--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote:
> 
> 
> It's not the firing order -- it's the displacement. Little engines,
> circa 1981 at least, simply lack enough inertia to idle at 500-600
> RPM. Like you, I love big block lope, but you'll never get it from a
> PRV. If you think the thing rocks & rolls at 800 RPM (*THAT'S* the
> effect of odd firing), try it at 500-600.
> 
> And don't forget that Volvo specified 950 RPM idle, surely for this
> very reason.
> 
>








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