Speed,Combat,Scale,Racing > Carrier

OS MAX .65 VR DF engine work for class II

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Dennis Holler:
Dave,
You aren't wrong!! LL~ LL~
I wasn't kidding early on when I said I might need the speed pole to hang on too lol

MM Good point on the hardness.  We are a ways from that though.

bill bischoff:
The slot should NOT be 180 degrees opposite the original slot!  It should be a mirror image of the existing slot. Whatever distance the crankpin slot is from the edge of the port opening, the new slot should be the same distance from the other side of the port opening. In reality is should be close to 90 degrees.

Motorman:
That's interesting. Any reversable drum rotor or rear disk valve I've ever seen has two slots 180 degrees from each other. You did mention turning the back plate, maybe that's the difference?

bill bischoff:
A disc valve with two opposed pin holes is so you can clock the venturi position two different ways. Upper left and lower right, for example. One always seems to fit the airplane better than the other. Having the backplate 90 degrees "out of phase" is what screws up the timing and makes it run backwards.

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