Quote:
Originally Posted by Mech Spec
It's not that I can't see it from your perspective, it's that your perspective is conjecture. You still cant actually provide any evidence that cylinder walls experience excess wear from start-stop restarts
And like I said, number of start-stop activations is inversely proportional to number of miles driven. Any car that actually reaches 200k+ miles in the next 10-15 years either was a commercial vehicle or was driven mostly on the highway.
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You make good points.
If one was concerned about cylinder wall (and ring/piston) wear with auto stop/start enabled one can only imagine the concern for the engine internals when subjected to a cold start after hours since last running.
I have driven a number of cars to 150K miles and beyond, one to 317K miles. And this one in 16 years. While none were equipped with auto stop/start they certainly were subject to cold engine starts. From 0F to triple digits. No engine manifested any issues from the high number of engine starts or even just the high number of miles and run time.
Auto stop/start has the advantage of starting a hot engine at most a few minutes after it was shut down. Also the engine controller knows which cylinder is at a suitable position to complete a full intake/compression stroke and thus likely fire when sparked (and fueled). Other cylinders do not receive any fuel nor any spark. All it takes is one cylinder to fire and the rest quickly follow. So prolonged cranking is not necessary.
Will add that even though there has been a expressed concern about auto stop/start and its possible negative effect on the engine there doesn't appear to be flood of posts of owners with sick engines arising from the use of auto stop/start.
From my work on automotive test equipment devices that collect engine and vehicle telemetry non-commercial passenger vehicles spend a considerable time idling. Testing with various brands/models of vehicles here and in Europe I also had these devices in all my cars from 2003 to 2017. Even though I had a 60 mile a day almost all highway commute it was surprising how many minutes of the trip the engine spent idling.
Short trips were ever worse. Often the engine spent as much time idling as it spend running above idle.