Crankshaft Modification 6

[mindenm]

Hi all,

I am neither an engine nor automotive engineer but recently using CAD I came up with a quite simple in my opinion addition to a crankshaft. It shows in that CAD model that power and intake strokes will last for 190 degrees of the crankshaft rotation but exhaust and compression ones- for the rest 170 degrees. At the same time a connecting rod deviates for up to 3 degrees from the direction of the piston center line during high pressure in a cylinder from TDC for about 130 degrees rotation of the crank. And only at the end of the power/intake stroke and the beginning of the exhaust/compression stroke that angle goes to about 16-17 degrees.
I would appreciate opinions of engineers in the field if those features would help to improve performance of an engine and if it is advisable to try to build a prototype.
P.S. It is a much simpler addition to the crank then Honda’s EXlink.

 

[Lou Scannon]

Excellent elucidation, Brian!

"Schiefgehen will, was schiefgehen kann" - das Murphygesetz

 

[BrianGar]

Indeed, and not a word wasted, star time.

Brian,

 

[mindenm]

Brian,
thank you for your analysis and the lesson. As I said from the beginning I was looking for both. Just by chance I stumble in that 190/170 split and did not know how it would play out. As you asked before, attached, please find a file with a 2 digs increment run if it is of any interest for you now. There are also 2 curves with changing positions of the pistons on the way from TDC for both a conventional and proposed mechanisms. The file is in Excel.
Michael