please help to identify 20v cams!

[george21]

i am doing some work on my aby and need to identify cams in there, i have been told that they are from rs2 but can't find strait answer are they or they not!!
there is what is writtin on them
first 034 AM and then separate 8561
second 034 102 G and then separate 828A
AUDI logo, germany, and that is it.
tried to do a search on google and here but had no luck, please help guys!!

[UrS4boy]

20V Camshaft info

i am doing some work on my aby and need to identify cams in there, i have been told that they are from rs2 but can't find strait answer are they or they not!! there is what is written on them
first 034 AM and then separate 8561
second 034 102 G and then separate 828A
AUDI logo, germany, and that is it.
tried to do a search on google and here but had no luck, please help guys!!

Here is some info:

Intake

AAN, ABY, 3B_ Opens 3° ATDC, closes 25° ABDC, duration 202°, lift 8,3mm
ADU__________Opens 13° ATDC, closes 35° ABDC, duration 202°, lift 8,3mm?
NM __________Opens 0° ATDC, closes 32° ABDC, duration 212°, lift 9,6mm?
7A___________Opens 6° ATDC, closes 38° ABDC, duration 212°, lift 9,6mm


Exhaust

AAN, ABY, 3B_ Opens 42° BBDC, closes 9° BTDC, duration 213°, lift 8,6mm
ADU__________ Opens 24° BBDC, closes 1° ATDC, duration 205°, lift 9,5mm
NM __________ Opens 35° BBDC, closes 3° BTDC, duration 212°, lift 9,6mm
7A___________ Opens 42° BBDC, closes 3° BTDC, duration 219°, lift 10,5mm



Intake cams:

AAN, ABY, ADU 034109021AN (after mid-Feb.1991, 021AQ before - see diagram below)
Opens 3° ATDC, closes 25° ABDC, duration 202°, lift 8.3mm
Note: installed, the ADU Opens 13° ATDC, closes 35° ABDC, duration 202°, lift 8.3 mm (because the RS2 cam sprocket is turned 10 deg)

3B = 034109021AH (to N005500); 021AQ thereafter. Spec? Not sure. Reference thinks they are the same as the AAN, etc. above. (Different PN because of the 3B drive gear.)

NM 034109021AD (NM is a 2L version of the 7A)
Opens 0° ATDC, closes 32° ABDC, duration 212°, lift 9.6mm

7A 054109021
Opens 6° ATDC, closes 38° ABDC, duration 224°, lift 9.6mm (7A looks suspiciously the same as the NM cam except for the 6° difference)

Exhaust camshafts

AAN, ABY, 3B PN 034109022D
Opens 42° BBDC, closes 9° BTDC, duration 213°, lift 8.6mm

ADU PN 034109022G (originally 034109022F, but the G replaced it Sept 30/97)
Opens 24° BBDC, closes 1° ATDC, duration 205°, lift 9.5mm

NM PN 034109022C
Opens 35° BBDC, closes 3° BTDC, duration 212°, lift 9.6mm

7A PN 054109022
Opens 42° BBDC, closes 3° BTDC, duration 213°, lift 10.5mm

Remember that the NM, 7A, 3B and early AAN intake cams have drive gears to power the distributor and/or cam position sensor (early AANs), as shown here (3B on the left, early AAN on the right):



The above is from:
http://forums.quattroworld.com/s4s6/msgs/87524.phtml which is, in part, based on
this reference thread: http://www.s2forum.com/forum/showthr...712&page=2

[george21]

cheers for info, but nothing is matching my part numbers! and how to measure those degrees etc got no clue...

[UrS4boy]

cheers for info, but nothing is matching my part numbers! and how to measure those degrees etc got no clue...

That is because what you see is the casting number for the camshaft blank that is then ground to the respective specification. That said, I had an RS2 Exhaust and I think it had the 021G cast into it. (It's in my AAN now so I can't check it).

To check the lift and duration you need a dial gauge and a means to rotate the cam shaft so that you can find the base circle and then the start of the lift and then the final maximum lift.

[george21]

I see... Better give it to machine shop to measure it for me and then compare to to the table in above post. As i wont figure out my self by the look of it.

[K Simmonds]

Hey George, sorry I missed your call last week, had a busy couple of days plus I'm rubbish at keeping my mobile on me (I hate the thing), what was it you wanted to know?

From the numbers you have posted I would expect them to be standard cams, Nothelle didn't change them as part of the conversion.

This link helps a bit.

http://www.20v-sauger-tuning.de/gussnummern.htm