Strange camshaft.

[petrolhead773]

So I bought 52mm kit off AliExpress and it came with a strange cam.
It looks like Glixal A9 cam but letters are different from Glixal A9 cam.
16002/P6 XX on first bearing
6002C3 TO TPI on second bearing
8 big holes 1 medium hole 2 small holes on gear
So is it a Glixal A9 cam or not? (The kit was brought from ChinaScooterParts not from Glixal)


Also is the Piston weight normal?

[90GTVert]

That's prob whatever they call an A9. I don't even know if there's a standard for an A cam that anyone follows. Should be, but they seem to vary a bit. Can't tell you if the piston weight is exactly what everyone gets for that brand, but it's roughly what some other brands weigh.

[GrumpyUnk]

In case is has been forgotten, there is a post(I think by 90GTVert) on site listing the expected weight of the various pistons. I do not have it at hand.
With a 52mm cylinder and piston, you are adding more reciprocating(back and forth) mass that will add vibration. It will also increase the acceleration loads on the connecting rod big end bearing and the wrist pin.
Is it too much, I cannot say. Others have installed them and it worked. It seems to depend on the luck of the draw with the connecting rod and connecting rod bearing installed on manufacture. Some last and some fail. Not much you could do to lessen the loads except grind away some of the piston you feel is unnecessary, or drill holes in the piston skirt or ??? to remove mass. I am not an engineer, but know that modern auto engines use 'slipper' pistons with not much skirt at all, but instead have the skirt cut away to leave a narrow band to handle the sidewall thrust(90 to axis of rotation - the piston gets pushed sideways a bit as the rod is offset by the crankshaft), and the fore and aft areas are removed. Go take a look at a new Chevy small block performance piston, or Ford 302 style. "slipper pistons" have less mass.
 I think the A9 camshaft is similar to a unicorn in that they are all a bit 'different'.  Either the lift or duration is done on a whim.  It seems.  And manufacturers crease 'performance' camshafts designed by their uncles' brothers' cousin.  Maybe.
 OTOH, it seems that there are A8, A10, and at least an A11 camshaft, apparently(from reading) used for 'racing' purposes.  Also like unicorns, not seen in the wild or on dealer shelves...  From what I've read by other posters, the A9 actually is more of a torque booster, and not much different at higher rpms.  More or less.  It won't add to top speed, but you'll get there quicker.  I think.
tom