I only saw one technical flay in blkfrds post.
Quote:
|
#2. Does spend more time at TDC like folks have mentioned.
|
Well, "folks" and you are slightly incorrect in this statement.
To be correct 'technically' the pistons in a rotating assy, regardless of rod length, spend exactly the same amount of time at TDC if the engines are running at the same rpm. (TDC is measured in distance and position rather than in length or period of time)
The one piston (short or long stroke) cannot stay at the point of TDC any longer than another piston (short or long) as the stop/go motion of the transition from BTC to TDC to PTC(past top center), will be nearly instantaneous in each circumstance.
So you're right that the long rod has more time in the upper quadrant due to it's slowing as it reaches the apex then the slower acceleration as it departs,(thus creating less stress on the wrist pin and other moving parts) than the shorter rod, but it's always at the point of TCD for no longer than that specific Degree of rotation which is almost an immeasurable amount as far as on a time line is concerned.
And with the ignition occurring at a position BTC, my entire statement is irrelevant to this post as far as practicalities are concerned.
Did I screw up again or did I do good?
