Are sure this is not a trick question? Can I take a guess?
There are four places this would happen. For example one would be about 30-40 degrees ABDC (After Bottom Dead Center) depending on the cam. The engine would be something like this:
One cylinder (piston going up) is on the compression stroke and both valves are closed (exhaust has been closed and intake just closed).
Another cylinder also has the piston going up and is on the exhaust stroke. Exhaust valve is open and intake has not yet opened. (30-40 degrees After Bottom Dead Center)
The third piston going down (30-40 degrees ATDC) and is on the power stroke with both valves closed.
The last piston is going down on the intake stroke with the intake open and exhaust just closed.
My guess is there are six valves closed at one time.
Since there are four cylinders there are least four places this will happen and it will last until the piston gets high (low) enough for the valve overlaps to come into play. It will not happen at TCD (Top Dead Center) because of the value overlap
Did I get it right???
Richard
At 02:26 PM 10/29/2003 -0900, Pete Thomson wrote:
============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Hi everyone, can any of you enlighten me as to which position, relative to Top Dead Center on any cylinder, is the position during which the most valves are closed on a C 85 ?
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