On the subject of piston height/ deck height- in order to get the squish band to work at 50 thou on a standard 850 with RH 10 head I calculate the CR will be 12.2 to one.
I get 13 to one for doing same with a 920?
Are my numbers correct?
RH10 combustion chamber, head upside down and levelled on work bench then filled with fluid to 50 thou over top the squish area.
= 37 cc
828/2 = 414 cc +37 cc = 451 cc
451÷37 = 12.2 to 1
Not gonna work.
For the 920 it's
37.5 CCS in the combustion chamber as the squish area gets widened out to 82 mm or so.
My pistons are 80.5 mm, so it's actually a 910 cc motor, not a 920.
455 + 37.5 = 492.5
492.5 ÷ 37.5 = 13.1 to one CR.
Really not going to work.
What is the cubic capacity of the 750 combustion chamber? It might be good to do the calculations.
Glen