Wow.... Bizzare....Originally posted by: Vic
Actually, I do understand.Originally posted by: Zenmervolt
No, you don't understand. In my example when cylinder 1 is at TDC, cylinder 2 is at BDC. This is how almost every 4-cycle in-line two cylinder I have seen is set up.
As for boxer engines, you're blowing smoke. I have a boxer 4 in my car (1976 VW-Porsche 914). Cylinder arrangement is as follows:
Cylinders 1 and 4 are both at TDC when cylinders 2 and 3 are at BDC. Cylinders that are directly opposed (e.g. cylinders 1 and 3 in my example) are never both at TDC or BDC at the same time.
First, look at the drawing on this page here.
Note how the opposing pistons are always at TDC together at the same time, then BDC together at the same time. This is how all horizontally-opposed engines are made.
See the pictures here
Second, VW and Porsche numbered the pistons for their old flat engines different that most other manufacturers. They did number them the way you showed above and the firing order was 1-4-3-2. Now you calculate piston positions based on that.
OTOH, Subaru numbers their flat 4 pistons like this:
And the firing order is 1-3-2-4, which is just the opposite (because the VW's were rear-engine and the Subarus are front-engine).
I think I have the same concept in my head that ZV does... dispite the animation, I'm having trouble computing it.. lol