I've been on the net a while and have long since been bothered if it seems that people are pissed at me. Written word doesn't convey nearly enough emotion. Then again, even if people are pissed at me, I don't worry about it

As for the dwell at BDC vs TDC, it is true. There is less dwell at BDC than at TDC. At 90 degrees (horizontal crank), is the piston at the same spot with a long and a short rod? No. At only two specific points will the piston lift be the same no matter the rod length. TDC and BDC. At all other times they are at different places at any particular degree.

Lets think of it this way. You know that a long rod has a lower peak piston speed. Well, how would speed be on a graph with angle and lift. Steepness of the angle. You also know that a long rod motor will have more dwell at TDC. So the only variables right now are steepness of the line on a graph (speed of the piston) and where that line 'connects' with the BDC dwell curve. If the BDC dwell curve is wider (more dwell), how can it have a lesser angle than a short-rod setup?


-=Whittey=-