Piston deck height/ Quench question
I yet have another question haha. Our rotating assembly calls for 12:1 CR with a 64cc cylinder head. (With a stock deck height/ 9.025) Problem here is after using UEM calculators I have found that we are -.020 down in the hole.
3.480/2= 1.74+6+1.265= 9.005 - Half the stroke+Rod Length+ PCH
So instead of being at 12:1 static compression ratio using a 0.041 gasket... we are at 11.3:1
If we used a cometic .027 thick head gasket it would bring the CR back up to 11.7 at .047 quench
Question is can we get away without being at zero deck running a thinner head gasket. Im scratching my head though why its advertised at 12:1 CR with stock deck height. We ordered the rotating assembly through competition products. I checked speedway motors rotating assemblies and it was the same scenario 12:1 advertised but when you add all the numbers up your -.020 in the hole. Am i calculating something wrong here or is this in fact true. Sorry if some of these things come off sounding funny I'm still learning and this will be my first high compression motor. :) Race fuel Motor lol
Thanks y'all