Re: Turbocharged engines and the idling start / stop system Quote:
Originally Posted by venkyhere How will you classify two exactly same cars - one parked in a basement like above and one parked on level ground (which doesn't need to climb a ramp) , each of them starting 365 days a year and driving off in the same manner, for 4/5 years or running 100k odo. Will there be a noticeable difference in wear between the two ? If yes, engine design and oil engineering are still not "fully reliable" yet |
Yes, if everything else is identical (the cars are driven in an identical way) there would be a difference in wear. How much is impossible to say. But climbing a ramp, even a steep one, would take a short while only. We are talking about minute cumulative wear. So once a day 10-20 seconds of running a cold engine at a bit of loading is unlikely to be a major problem.
Gut feeling is idling the engine is likely worse than a bit of engine loading anyway.
I am not sure what you mean with engine/oil design and engineering not fully reliable yet. I am not aware of a single design that does not have limitations. Whether it is a car, a plane or a coffeemaker. Take it beyond its normal operating instructions and you are likely to see problems, or additional wear and tear.
You want to push a performance envelop it is just a question of money. How much more expensive can an engine/car be to solve this? In practice it tends to be more of a theoretical problem. Certainly for the first 100-150K kilometers.
So you are wearing the piston rings and the cilinder (liners). To a lesser extend probably bearings/cams/valve stem seals a bit too. How big a problem is that really? The first sign of this kind of wear tends to be oil consumption.
As long as you are not loosing compression you can debate how relevant engine wear, or oil consumption is? We have another thread on oil consumption. Lots of people are very concerned, but on many engines up to 1l of oil consumption per 1000 km is not considered a problem at all. (again, do not believe me, but check your owner manual!).
An engine overhaul is expensive, adding some oil now and then is not.
Jeroen |