cofab pistons? again...

[joop]

DJ=2.1
DF=1.9

BBB

Joop

[Joe vw]

Actually the second picture at the beginning of this thread shows me what I need to know

Bottom picture is a DJ piston on the left and the same DG cofab on the right

IMGP4711.JPG

I will try some mockups to see what can be done with what I have.
The DG top piston ring is too high to shave the piston along with the valve notches.
If you have a staight edge, a picture like on the Go-Westy site with all pistons linked with the straight-edge on top (pictured head on centered) would be most informative along with depth mic measurements to the peak of the valve notches. I'm just saying .
I don't believe we ever got the DF piston version in the USA.
Thanks for the pictures though.
I may just use the MV pistons, opening the valve notches along with the abscence of the head gaskets then put some pressure through the 48 dellortos

[fastback]

i did test assemble a 2,1 turbo engine today,
with stock rods MV pistons,
stock valves
Eagle 286° turbo cam with 9,6mm lift @cam
1,1:1 rockers,
turned the valve adjusters 2,5 mm in from "zero lash"

no hitting the pistons.

[Paul Lee]

How do DH pistons compare? I remember hearing somewhere that 1.9 and DJ pistons are similar, although now it seems like they may have been referring to a DG. I have my DH in pieces right now and am curious.

[joop]

All 1.9 pistons are the same... but I did find out that some had a deeper valve cutaway but this had nothing to do with the engine #
opened a DG engine today and one piston had one circlip missing

wbx19.jpg

DF= 3,75mm
MV= 4,5mm
DJ = 4,8mm

Have many pistons with this typical damage

IMGP4923.JPG

Some had also damage at the hydros... done by the pushrods...


Joop

[fastback]

good info on the valve pockets!
yeah when the hydros get worn and noisy, the pushrod is all over the place.
hitting the lifter in random places