| Re: [GMCnet] 2 interesting topics. Warming up your engine before leaving the drive. Piston travel. [message #326970 is a reply to message #326969] |
Sun, 10 December 2017 10:04   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Ring reversal under combustion pressures wears rings, cylinder bores and
piston ring lands and grooves about as much as anything else. Compound that
with dirty intake air fuel mixture, and not enough lubrication at the top
of the bore and you can see why the top of the bores wear more than the
bottom does. Further compound that issue by doing it when the engine oils
and coolant is not at operating temperature and you have your answer to why
cold engines wear more quickly than warmed up ones do. Many more factors to
consider here, but that's enough to keep this conversation going for now.
Jim Hupy
Salem, Or (currently at a GMC CASCADER rally at Westport, Washington. It is
a balmy 39 degrees farenheit and the sun is just peeking over the clear
cloudless horizon. Travel home today, where it currently is 28 degrees.)
On Dec 10, 2017 7:22 AM, "John R. Lebetski" wrote:
> Water. Water is the issue during a long cold and lazy warm up. More than a
> gallon is produced for each gallon of fuel burn. Thankfully most exits via
> exhaust but the rest ends up in the oil until it boils off. After about 60
> Secs (and bags have reached auto level) I drive off gently to minimize
> idling. Then drive normally but not aggressively til normal temp. On a
> sliding scale I would adjust times with temp drop. Might be 2 mins below
> zero
> and driving more gently at first as well. But road load is your friend in
> the anti watering war. Also the dash heat will work much sooner and forward
> progress beats 0 MPG any day.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
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