Camshaft Confusion, Correct Part# to run original D-Jet Options

[914_7T3]

The cam from my '73 is worn and I have secured what I believe to be a NOS replacement part #021109111B that has been separated from its box (will arrive Monday). This is the identical part # to the one that was in my GA case and I purchased it listed as the correct part for my car along with the '76 912e.

However this is merely the part number for the Camshaft gear and there are no additional part #s on the Cam itself.

Questions as follows:

#1: The cam gear is riveted to the shaft as a one piece assembly, so is there anyway that this can be the incorrect replacement shaft?

#2 Cam Gear Part number 021109111C has a corresponding part #021109101K stamped on the cam itself. Some say that the difference is that the C designation is a stronger alloy versus magnesium for the part designation ending in B. Is that correct and would this be the correct cam as well for a GA case? If so, would you go alloy or magnesium? Both gears are marked -3 at the teeth.

#3 Worst case scenario, can the original be reground or would it be foolish to reuse.

#4 Are there any replacement Cams that are as good as or better than the NOS 44 year old OEM option?


Here are some pics as oily engine parts are cool (IMG:style_emoticons/default/sunglasses.gif)

[Superhawk996]

Follow up - New Learning

So after having bought engine GA000099 it turns out that this engine is a stock 2.0L that has never been rebuilt before. I say this based on the fact that the engine tin, cheese head screw had never seen a screwdriver and because it had an intact D-jet system inclusive of many original ground connectors, spark plug connectors, etc. Stock Mahle 94mm shallow dish pistons, etc.

With the help of
@914_7T3 I was able to locate a NOS crankshaft.

Initially I was skeptical that this was the correct cam for a stock 2.0L since I couldn't verify the part numbers from any of my own take off parts from my vehicle's engine.

My recent purchase of Engine GA000099 is shedding some light on the situation.

The cam I bought is stamped with VW part 021.109.101K. One pink paint stripe. One 1/2 ring cast on the cam to the right of the center bearing surface.

Porsche part number on the box is 021.109.015K but there is no way to tell for sure if this is the proper box for the NOS cam I received since the box wasn't sealed. Boxes often get shuffled and/or simply used as safe place to store parts. If you think about it, it is pretty amazing that 40 odd years later we can still find any NOS parts!

I suspect my box wasn't original to the cam I purchased since the drive gear on my NOS cam is a "0" pitch offset which should be 021.109.021M according to PET. 021.109.015M is supposed to be a "-3" pitch offset but would be the same cam profile, just a different drive gear. Really doesn't matter since I only care what the camshaft actually is - not the box. However, it all adds up to another source for confusion. Given that there are other known errors in PET, I don't even fully trust that!



PET indicates that suffix(s) of the latest part is "M". Despite much searching on the net, I could never find a firm tie between the VW part numbers, the Porsche PET part numbers, or any parts that end in suffix "K" vs. "M".

I found conflicting information all over the web. The most authoritative seemed to be:
https://www.thesamba.com/vw/forum/archive/i...t-348618--.html

In splitting the case of GA000099 you can see that the stock cam is marked with two pink stripes.



along with VW part number 021.109.101k



the cam has 1/2 band cast into it .



Not sure why this cam has two pink stripes vs. my NOS cam with only one pink stripe but suspect that it may be due to the difference in the drive gear. My NOS drive gear is a "C" suffix with "0" pitch offset. The drive gear on the GA000099 is a "B" which indicates "-3" pitch offset. Different levels of variation in gear pitch diameter allowed for select fit of the cam to crank gear to minimize cam backlash as part of factory build.

So it does indeed seem to me that the NOS camshaft that I bought is indeed the correct cam for a GA motor. VW part number matches. Cast 1/2 ring matches, paint color matches. Good enough for me. I'm happier than a bird with a french fry! (IMG:style_emoticons/default/piratenanner.gif)



Hopefully this helps someone else in the future.