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Posted by: vesnyder Oct 24 2007, 08:21 AM

I am in the process of assembling new P&C's onto my motor and Jake's video says the cylinders arrow should point to the flywheel - except on mine there is not an arrow? I have AA P&C's - is there a parrticular alignment I should use? The only marking on the cylinder I see is "STD" stamped on top. Somebody also maked the bottom of the piston with a red marker on the side that is aligned to the non-flat side of the cylinder. Anything I should do or just "bolt them up"?

Posted by: type47 Oct 24 2007, 08:58 AM

i thought that the "pointing" of the pistons was very important, i think it has something to do with piston slap or the pressure of the piston skirt on the cylinder. i faintly recall that the 2.0L piston pin is offset so as to produce even skirt to cylinder pressure so that one side of the piston doesn't wear more than the other side of the piston. i don't know what the measurements are but if your piston isn't marked as to which side goes toward the flywheel you could measure the distance from the center of the piston wrist pin hole to the 2 opposite sides of the piston. but i don't know what to do with those measurements.

Cap'n ????

Posted by: toon1 Oct 24 2007, 09:10 AM

there should be an arrow notop of the "piston" that will point towards the flywheel.

If I recall there is no arrow on the cyl's.

Posted by: blitZ Oct 24 2007, 09:13 AM

Not all pistons have an orientation. You might want to contact the manufacturer.
The KBs I got from Jake go either way.

Posted by: geniusanthony Oct 24 2007, 09:32 AM

In reading the Tom Wilson book about Rebuilding your Aircooled VW engine, I seem to remember that only Type 1's had the orientation marks. Damn now I am thinking back trying to remember if I did this or not when I built mine...
Someone please put my mind at ease on this one...ANd yeah, vesnyders too

Posted by: StratPlayer Oct 24 2007, 10:06 AM

When installing my new pistons and cylinders I had the euro pistons. They had and emblem on the pistons that looked like a crankshaft and that emblem was installed with the emblem facing the flywheel on all cylinders

Posted by: Cap'n Krusty Oct 24 2007, 10:56 AM

QUOTE(geniusanthony @ Oct 24 2007, 08:32 AM)

In reading the Tom Wilson book about Rebuilding your Aircooled VW engine, I seem to remember that only Type 1's had the orientation marks. Damn now I am thinking back trying to remember if I did this or not when I built mine...
Someone please put my mind at ease on this one...ANd yeah, vesnyders too

Posted by: Borderline Oct 24 2007, 11:09 AM

I asked the same question last year when assembling my 1911. The AA pistons are symmetric and can be assembled either way.

Posted by: vesnyder Oct 24 2007, 02:23 PM

Thanks! Borderline - very interested in the oucome of your 1911. Did it meet expectations?