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Gazzalene

Shock cap bleed hole?

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Just seen a video on YT where a guy improves some Axial shocks AND it was a big difference after the mod.

The shocks where sprung,metal body and plastic cap. Very much like Tamiya and others.

The thing he did was to put a very tiny hole into the plastic cap above the diaphragm.

Thinking about this I have seen some shocks with a bleed hole but this is more a "equilation" hole. What are your views on this? where do many not have this hole?

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The hole lets out the air trapped between the cap and the diaphragm, to eliminate the springiness of that air compressing. It probably makes the shock smoother and more consistent, but like so many tiny details on RC cars, whether or not it's a meaningful difference in performance is up for debate.

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The vintage tamiya HiCaps have such a hole in the top cap.

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I have not long got back into rc. I am surprised that all the Tamiya shocks I have built to far have the piston force itself back out.even without the spring,just feels so hard. Do not know if they are built that way and it takes some weight off the springs? I might give the vent hole mod a go.

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Here is a diagram for what's happening.  

Even without a vent hole, I build the shocks with the rods about 1/4 or 1/3 way in.  

oM26QNk.jpg

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On 8/18/2020 at 11:04 PM, Gazzalene said:

I have not long got back into rc. I am surprised that all the Tamiya shocks I have built to far have the piston force itself back out.even without the spring,just feels so hard. Do not know if they are built that way and it takes some weight off the springs? I might give the vent hole mod a go.

It’s deliberate. It provides progression in the spring rate as the shock goes deeper through its travel. 

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