Ok last time then I am done with this. This was told to me by an engine builder I use to have do my motors so I wont take the credit for it.

Your standing with a piano on your back and your jumping up and down. Everytime you jump up you hit the ceiling. Your use to the piano and your legs have gotten use to this load. Everything is working fine but now someone takes the piano off of your back and now you jump. Do you think your going to hit the ceiling with less force? Ok now its time for a couple tylenol's

 

Of interest is only that 25% of the 4 stroke cycle - the power stroke. The other 3 is as you say. Near, at and just after the power stroke, if there is load, the crank will give constant back pressure on the rod big end (and up the line to the rod/wrist pin end). In this instant, the gap will not get larger (ie. slap or close in the opposite direction) due to the "load" keeping that gap or "clearance" at a minimum. It is this 25% of the time that having load will diminish the wear and tear on that part of the hardware.

 

But even when revving while idled, the piston is still going to drive the crank on the power stroke, otherwise the engine would cease turning. The only way that it would be otherwise is under engine _braking_. Remember, there's still a few hp of load for friction, oil pump, water pump, alternator - well enough to provide a resistance.

Sure, because I'm not going to jump nearly as hard. Similarly, you're not giving your engine NEARLY as much gas when you rev it in neutral as you would to acheive the same revs onder load. I guess if you could somehow bypass the engine computer and rev limiter to dump large amounts of fuel into the cylinder at zero load, then it would be as in your analogy, but I don't think our friend from the original post was doing that.

 

I do believe some of you guys think too much.

 

You are sooooo right! I'm going to take my own advice and STOP "over-thinking" this thing. It only takes from the enjoyment of driving this great car.

 

Your right....its back to the crack pipe after these responses

 

when i do my oil change in the honda dealer, they always rev up my engine after the oil has be replaced..
how about when u replacing the radiator coolant the s2000 owner's manual tells u keep the rev at 1500 until the fan comes on twice (a few mins)
i feel bad for my s..

 

[QUOTE]Originally posted by whiteGoKart39
[B]when i do my oil change in the honda dealer, they always rev up my engine after the oil has be replaced..