Made a little chart to show hole area and hole sizes.
mm..........2.......3......4.......5.......6..
1.0......1.571 2.356 3.142 3.927 4.712
1.1......1.901 2.851 3.801 4.752 5.702
1.2......2.262 3.393 4.524 5.655 6.786
1.3......2.655 3.982 5.309 6.637 7.964
1.4......3.079 4.618 6.158 7.697 9.236
1.5......3.534 5.301 7.069 8.836
1.6......4.021 6.032 8.042
1.7......4.540 6.809
1.8......5.089 7.634
1.9......5.671 8.506
As you can see 2x1.7 will have similar STATIC pack to 3x1.4 or 4x1.2 or 6x1.0.
When you move the shock shaft slowly, the differences between them is not that noticeable. However, the differences between fewer larger holes and more smaller holes is when the shock starts to pack. Less holes pack late in the stroke. More holes pack earlier due to more turbulent flow from more holes. Normally I alter pistons size and holes to adjust for track conditions. Bigger holes also favor bumpy tracks, but will bottom out more on larger jumps, smaller holes are preferred on smoother tracks with larger jumps.
I don;t have a chart referencing piston sizes (area of the holes) and oil weight combinations as there are too many different brands of oils.
Remember, oil weight is used to control the weight transfer front to back and side to side.
You can match heavier oil, and more holes or larger oils and light oil with smaller and less holes to achieve the same damping ratio, but heavier oil and larger hole area pack later in the stroke. Lighter oils and smaller hole area pack earlier in the stroke. It depends on what you want to achieve with the car.
Normally I tend to figure out what oil I want to use (heavier for fast flowing, high grip, and lighter for smaller technical tracks) and match the piston sizes and holes accordingly. Bigger holes for low grip and bumpy tracks, smaller holes for higher grip surfaces. Smaller holes for larger jumps. Just need to find the perfect balance and it takes time to test and find the right combination.
This is my opinions and testing. Feel free to experiment and try.
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