上個月交了台G30 到現在1000多公里，油門沒有超過一半過。保養手冊說前面不能開太快。又過了一定的訓車期後才可以操。現在的車還有這種觀念嗎還需要這樣子嗎？聽聽大家意見
Jeam0007 wrote:
第一桶機油，建議訓車...(恕刪)
最清楚你的的引擎設計與製造的就是原廠，所以要相信車主手冊的話。
這1-2 年家裡剛好買新車，日系車1000km 漏出的機油，肉眼可見金屬屑一堆，而歐系引擎則完全看不到金屬屑。前者在磨合過，用力操以前，當然是換油比較好，而後者我也是建議用力操以前換性能好一點的油再來操比較保護引擎，不用擔心磨合期沒操車，以後就不會跑這種沒有理論依據的話，最多只是電腦要一段時間學習而已。
後來我爲了追查這樣的差異背後的原因，才了解現在的汽缸製造技術有進步，以致於新引擎已經很接近以前磨合完成的引擎，所以金屬屑少很多，但這種新製程對於零件的製造公差比以往更嚴苛，因此也讓大量量產的引擎吃機油的比例比以往高.
AlfaBrera32 wrote:
最清楚你的的引擎設計...(恕刪)
我看完以下連結的文章,比較能理解為什麼歐系車比較會吃機油,如果吃的量不大,而且沒有變嚴重,就比較能接受,我摘錄一些關鍵的句子:
http://www.aa1car.com/library/plateau_finish.htm
Scott Gabrielson, a ring engineer with Federal-Mogul, says he is very much in favor of plateau finishing because that is what a ring does to the bore finish when it breaks it in. "The closer we can get the bore to what the ring likes to run on, the less the ring will wear during break-in and the longer the rings will last."
"What is more important than bore finish today," says Scott, "is bore geometry. With low tension oil rings, you can get into big trouble fast if you have bore distortion problems."
One change Meara said he has seen lately among some race engine builders is a desire to increase the "RVK" numbers (valley depth) in the crosshatch to improve oil retention. Another issue is how to minimize bore distortion when the engine is running.
http://www.aa1car.com/library/oil_consumption.htm
HIGH OIL CONSUMPTION IN SOME NEW VEHICLES
Auto makers plateau hone the cylinders so the rings will seat quickly. Plateau honing shaves the sharp peaks off the scratches in the cylinder wall after the initial honing so the finish will be similar to a broken-in cylinder. If the honing process is not done correctly, the rings may never seat. This is especially important on engines with aluminum alloy cylinders or hard coated (Nikasil) cylinders.
Also, many late model engines are factory-filled with low viscosity synthetic oil (5W-20, 0W-20, 0W-40, etc.) to reduce friction and improve fuel economy. Low viscosity oil is thinner so it can leak past rings and valve guide seals easier than heavier viscosity oils. Synthetic oil is a great lubricant for all types of driving but it is NOT a good break-in oil - especially if the cylinders were not honed properly.
Most aftermarket engine builders break-in new engines with a conventional non-detergent SAE 30W or 10W-30 motor oil or a special break-in oil. Once the piston rings have seated (a process that can take 45 minutes to an hour or more on a dyno, or several hundred miles of normal driving if the engine is broken-in in the vehicle), the break-in oil is drained and the engine is refilled with what ever oil will be used for normal driving (conventional or synthetic).
There's no easy fix for improperly honed cylinders or incorrectly installed rings other than to rebuild or replace the engine - an expensive fix that most car manufacturers want to avoid. So if your new car dealer tells you high oil consumption is "normal," they are full of BS! A late model engine that has been honed and assembled correctly should use less than a half a quart of oil between normal oil changes (and that includes engines that specify oil changes every 5,000 to 7,500 miles!).
目前日系車大部分的汽缸製造方法是這種:
http://www.stealth316.com/2-breakin.htm
Fill the engine with the appropriate amount of 10W30-weight, petroleum-based oil. Start the engine and let it run for about 20 minutes at low (about 2000) RPM. Drain the oil while it's hot and inspect the oil for metal particles. There should be no chunks of aluminum, brass, iron, or steel. Refill with oil (see below for type) and drive the car (after any other considerations have been addressed) for 500 miles and drain the oil again. During those first 500 miles, the loading on the rings should be moderate and varying. This is accomplished by varying speeds (no long-distance constant speeds, especially full-throttle) and occasionally increasing the cylinder pressures by quick acceleration or full-throttle uphill climbs. Stay away from redline though. If very-hard rings are used with hard cylinder liners (which are not used in the Mitsubishi 6G72 cast-iron block), the full break-in period may take longer than 500 miles.
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