Here is what I am after: an M54B28 block using the longest connecting rods possible to improve the Connecting rod ratio and lower piston speeds over traditional setup of 135mm rods and 2.8l pistons.
M54 allow block, 211mm deck height.
M52B28 Crankshaft 84mm
M50B25 connecting rods 140mm
M54B25 Pistons, 27.75mm Compression height
So, on paper it looks like this:
84/2 =42 + 140 + 27.75 = 209.75
The M54B25 block using the 75mm crankshaft, 144mm connecting rod and, 27.75 CH pistons come to 209.25mm.
So, if I went w/ the 84 crank route with the long 140mm rods then, the M54B25 piston CH would change by 0.5mm. What do you think the compression ratio would yield with something like this? I'd say, it would go up by a full point..? 11.2:1
Do you think, there would be issues with piston\valve contact because of the additional 0.5mm in Compression height?
M54 allow block, 211mm deck height.
M52B28 Crankshaft 84mm
M50B25 connecting rods 140mm
M54B25 Pistons, 27.75mm Compression height
So, on paper it looks like this:
84/2 =42 + 140 + 27.75 = 209.75
The M54B25 block using the 75mm crankshaft, 144mm connecting rod and, 27.75 CH pistons come to 209.25mm.
So, if I went w/ the 84 crank route with the long 140mm rods then, the M54B25 piston CH would change by 0.5mm. What do you think the compression ratio would yield with something like this? I'd say, it would go up by a full point..? 11.2:1
Do you think, there would be issues with piston\valve contact because of the additional 0.5mm in Compression height?