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Old 03-05-2010, 07:43 AM   #1
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Default Comparing Pistons

Was curious about this so I figure some of your gurus out there can answer.

Is there a formula you can use to compare pistons to each other?

Example:

- Piston 1 - 2 hole with 1mm holes, what would be an equivalent 3 hole piston and same question in reverse?
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Old 03-05-2010, 08:19 AM   #2
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assuming the same thickness and overall diameter of the pistons, you can probably compare them using the formula for calculating the area of a circle (pi * r^2). sum the area that the oil will flow through and that should be ballpark.

if you're switching between piston mfrs, things like the edge radius and hole tapers can affect the dampening as well, and are much tougher to calculate/predict.
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Old 03-05-2010, 08:33 AM   #3
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Quote:
Originally Posted by seaball View Post
assuming the same thickness and overall diameter of the pistons, you can probably compare them using the formula for calculating the area of a circle (pi * r^2). sum the area that the oil will flow through and that should be ballpark.

if you're switching between piston mfrs, things like the edge radius and hole tapers can affect the dampening as well, and are much tougher to calculate/predict.

So do you mean like this?

I am running Tamiya 4 hole pistons bored out to 1.4mm.

(3.1416*1.4^2)*4 = 24.63 square mm?
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Old 03-05-2010, 08:42 AM   #4
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Quote:
Originally Posted by PitNamedGordie View Post
So do you mean like this?

I am running Tamiya 4 hole pistons bored out to 1.4mm.

(3.1416*1.4^2)*4 = 24.63 square mm?
close.

3.14 * (0.7^2) * 4 ~/= 6.15 sqmm

realistically, pi doesn't even need to be there for the relative comparisions, but let's not ahead of ourselves.
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Old 03-05-2010, 09:15 AM   #5
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Quote:
Originally Posted by seaball View Post
close.

3.14 * (0.7^2) * 4 ~/= 6.15 sqmm

realistically, pi doesn't even need to be there for the relative comparisions, but let's not ahead of ourselves.
Gotcha

Oh and uh..I knew r was radius not diameter
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