Tim van Schyndel
Well-Known Member
- Joined
- Jan 22, 2013
- Messages
- 99
I have read two different ways to calculate the compression ratio which involves either the full cylinder swept volume or volume from top of exhaust port to TDC.
My questions are:
Tim
My questions are:
- does either method matter as long as you always use the same method?
- what ratio to aim for with 50% nitro (non toroidal head buttons) for either method?
- When measuring squish, does the "slack" (which is taken up by the measuring) in the main and big end rod bearings have an impact on the measurement. e.g. I use a small piece of solder through the glow plug, turn the motor over and measure the squashed lead solder. As this would take any force all bearings down, does it represent the true squish. I thought it would considering it is the compression stroke although it would not take into consideration oil and the crank counter balance applying forces in the opposite direction.
Tim