I have a couple of interesting updates that some might find interesting.
Firstly, Colt Cams has brand new better cams that will be ready to ship in a week (maybe 2 tops) for the V10 touareg! WOOT. I'm going to be installing a set of them into my 04, and a couple other local fellows. This job can be done without dropping the engine and I will post up a video on the removal and reinstallation of these cams documenting the procedure.
The other reason for posting is regarding the hydraulic lifters in the TDI engines. Specifically the newer "better" black nitrided lifters.
I made a video about this yesterday and it has been shown to Colt and Kerma before it was made public. I imagine a number of people who do business with these people will be notified regarding this issue in the following weeks.
Here is a link to the video
If you do not wish to watch the video the short version is that all the TDI engines have an improper grind on them. There is a .011" ridge on the cams which is what you would find on a solid lifter style cam grind. But VW does not include the proper entry ramp to follow it.... But due to the cam and lifter issues they put out the black nitrided lifter which is harder and should help to reduce wear. What they did not state is that they modified the lifters by changing the piston design and adding a spring to make a hydraulic lifter that then maintains roughly a .014" valve lash.
This means that these lifters MAY help to reduce the wear on a stock ground camshaft. I say may because the cam grind does not actually have the proper re-entry ramp that is on a mechanical/solid profile. But most cams being sold now (and all performance grinds) are using a proper hydraulic lifter profile.
So this means that if you have a performance or new cam with a better profile, and are using the black nitrided lifters. You are getting a slap between the lifters and cam lobe that will likely cause an accelerated rate of wear on the parts.
To correct this, all you need to do is pull the lifters, smack them on a hard surface to pop the piston out and remove the spring that sits right on top of the piston. Then push the piston back into the lifter and reassemble. There will be much less top end noise in the engine after doing this as well.
I hope that this helps a few people save a few $$$ on repairs down the road!