[Grady Clay]

Armin,

As you noted, the picture is of the casting number.
With your May 1971 casting, the other half of the crankcase should be 901.101.102.3R.
Can you confirm?


Cam timing on a 2.2 911E (type 911/01 and 911/04) is:
Intake valve lift at TDC Overlap with 0.1 mm valve clearance - - - 3.00 mm to 3.30 mm with ‘desired value’ 3.15 mm.

Specs for the 901.105.181.00 (L, MFI) and 901.105.110.05 (R) cams are:
Intake lift 36.58 mm.
Exhaust lift 36.25 mm.
Intake opens 20° ATC.
Intake closes 34° ABC.
Exhaust opens 40° BBC.
Exhaust closes 6° BTC.


This afternoon I’ll call JE and ask why you got no response to your five emails.
I may have posted an incorrect (or not monitored) email address from their website.

It is critical that you know the CR, deck clearance and valve clearance.
Regardless of input from JE, any good builder will physically measure these critical numbers.
I would be particularly cautious given the pistons don’t have the markings noted in the JE website.

If, for some reason, you buy new pistons for your cylinders, send the cylinders to JE for accurate fitting piston size (you can specify the clearance).
You can also choose smaller valve pockets, more suitable for your valve size and 911E cams.
This allows for a lower piston crown (better flame travel) at the same compression ratio (CR).

Please post images of the tops of the cylinders where the head gasket sets.
It is not clear (to me) if these are for a 2.0 head or a 2.2/2.4 head.

What does the piston-to-cylinder clearance actually measure?
(Note Steve’s post above.)

Have you considered twin ignition for this engine?

Best,
Grady