I ran my math for this engine. The numbers are startling in several ways.
I used the exact same specs for both combinations where it mattered. Peak torque at 5700 and power at 7300. And an effective compression ratio of 11.5 with a SCR of 12.4
The numbers they gave on the show for the cam the picked is 284/296 on a 112. We have no idea where it’s timed at because Dave didn’t say.
My numbers for the long rod engine:
271/282 107/105
I quickly picked some bullet lobes. This is probably what I would have used. If I looked harder at Comp and Howard’s I may pick different lobes but this is close enough.
Long rod engine:
R303/4665 303-271-193-.4665 (.782)
R314/4620 314-282-200-.4620 (.785)
IVO 46.5 BTDC
IVC 76.5 ABDC
EVO 86.0 BBDC
EVC 48.0 ATDC
94.5 overlap
Short rod engine:
R303/4665 303-271-193-.4665 (.782)
R320/4414 320-285-205-.4445 (.756)
IVO 43.5 BTDC
IVC 79.5 BBDC
EVO 92.0 BBDC
EVC 48.0 ATDC
91.5 overlap
The long rod opens the intake valve 3 degrees later than the short rod.
The long rod closes the intake valve 3 degrees sooner than the short rod.
The long rod opens the exhaust valve later than the short rod.
The long rod and the short rod engine close the exhaust valve at the time.
The long rod engine has 3 more degrees of overlap.
It would be interesting (and costly) to repeat the test and change cams for r/s ratio.
I’m not sure why the torque peak was at as low rpm as it was with 13 more degrees of intake duration on the cam they used in the test.