Wap, wap, wap. Options

[Bee Jay]

I didn't make the WCC because of this sound coming from the engine compartment. It didn't get louder when we plugged the tailpipe. I ran a compression check this weekend. Cylinders 1,2 & 3 were 100lbs +- 5%, but number four was only 50lbs. OK, the head is either cracked or the head to piston seal is gone. There are only 4K miles on the engine since Wayne Dempsey, Tom Gould and I built it in 2000. There was a lot of debate at the time on whether or not to include the copper "head gasket" and the popular advice was to leave it out. Am I to regret that decision? My 3.0 motor isn't ready, I haven't even started tearing it down yet, so I guess I need to drop this 2.0 liter, and repair the head leak, if I want to drive it this summer.
Bee Jay
My car:
http://www.picturetrail.com/gallery/view?p...2754&uid=598455

[DBCooper]

QUOTE (aircooledboy @ Jul 19 2005, 06:36 AM)

Engines, P/N 071 100 031AX, 039 100 031 B/C/DX, have been modified to improve heat transfer an increase durability. These changes effect Engine codes: GD, GE, CV. The following improvements have been introduced as of remanufactured Engine number 89000.

I think you're reading that wrong. It says that VW's own reman engines were changed as of that date. I'd say if VW found that change to improvge VW's engines being rebuilt to be put into VW cars and busses then it's probably equally effective on VW's engines being rebuilt to be put into Porsche cars.

As for lapping the cylinders I can say from experience that it pretty much eliminates sealing problems in VW engines in VW cars. If you look at machined aluminum under a microscope you'll see that there's no such thing as a "perfect" machined surface. There are always imperfections, high and low. Lapping doesn't remove any metal to speak of, little or none on the tops of the steel liners and not enough to change any angles in the mating surfaces, it just takes off the sharp tops of the ridges and microscopic galling in the aluminum. It's still not perfect, but it's a better mating surface than the raw machined surfaces.