@@kennethx2 Actually, you are wrong I'm afraid, 93 is better than 87. A higher octane rating indicates greater resistance to knock. In layman's term, more power. The ECU can take advantage of the elevated knock threshold and dial in more aggressive timing to improve performance. There was a test by a magazine, that even in a Civic (賣菜車), there was an increase in power of close to 10 HP. Most performance cars insist on running on higher octane fuel … I wondered why ? 🤔🤔
@kennethx22 жыл бұрын
@@ahlapski I am not 100% sure too, but what I learn from a Honda mechanic, he told me that if your engine not required premium fuel, it won’t harm to your engine if put 93 on it, but won't improve how your car runs. In the other hand, a performance engine requires premium fuel can’t put 87/89 on it, detonation may happen, it can damages the pistons, some car have sensor show you the wrong gasoline. To choose the correct fuel follow the owner’s manual is what mechanic recommend, could void your warranty if the factory find out
@alanchang68982 жыл бұрын
partly right partly wrong. you need to run pretty rich in low engine loading to have bore wash. 14.0 13.5 isn't going to destroy your engine. yes, it is going to waste some fuel. but it isn't going to wash out the bore. if you talk about bore wash, the afr is going to be around 11 region at light load. you need slightly richer during idling because the block is cold. a heated block helps to vaporize the fuel to make the combustion happen easier. dig deeper before going too technical. paper is paper, paper always have differences from application.
pistions are oval when cold. they will turn round after warm up. they do not take a long time to get to operation shape. however, they take a 5 minute plus when -30c. in addition, this topic is more cirtical to short skirt pistions. they will cause permanent pistion slap. one more major item in the vehicle also need to be warm which are transmissions.