Aan And 3b Cams Are They The Same

[220bhp]

Can anyone tell me if AAN cams with dissy gear and 3b cams are the same.

[S2central.net]

Yes

[rs200]

NO they are NOT the same..

intake cam have different type of teeth for "distributor" AAN have more and 3b have less teeth. you must have the same type.
but they are same . they open and close valves exactly the same.
if you have hall sensor under the cam pulley , you can use 3B cams , without any problem

[S2central.net]

mmmm well the old family album CLEARLY shows that 3B intake cam 034 109 021 AQ is also used on the early AAN engine with the CMP/G40 driven by dissy gear.

True there is an earler variant on 3B than ends with part number AH but I've not found out why yet...

[S2central.net]

Interestingly - there are TWO versions of 3B distributor and the changeover lines up with the INTAKE camshaft so there must be something in this from Varazin. Well observed too !

So in fact we can say the late 3B (from 8B-N-005501 onwards) has same intake camshaft as the AAN.

You cannot however use intake cam from early 3B (or the RR) in the AAN if it needs to drive the CMP/G40 sensor.

[twoqu]

http://www.s2forum.com/forum/showthread.php?t=49137

[rs200]

two versions of 3b distributor and there are different in gear.
for Europa come with metal gear , and to America go with plastic gear.

sorry but my English are not so good..

[UrS4boy]

mmmm well the old family album CLEARLY shows that 3B intake cam 034 109 021 AQ is also used on the early AAN engine with the CMP/G40 driven by dissy gear. True there is an earler variant on 3B than ends with part number AH but I've not found out why yet...

You do remember this photo Thuppu posted (taken by Jari Aalto):

3B on the left, AAN on the right:

[UrS4boy]

20 valve Turbo and non-Turbo Camshaft PNs and Specifications

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° BTDC, closes 38° ABDC, duration 224°, lift 9.6mm

Exhaust cams:

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

AAN camshaft PNs with intake cam PN change:



NM,7A,3B and ABY camshaft PNs



ADU (RS2) camshaft PNs



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):



Reference for the camshaft specs:

http://www.s2forum.com/forum/showthread.php?t=22712

[RaiviS4]

Maybe someone can tell, from an engine(aan,7A,3b) is the camshaft?

[UrS4boy]

Maybe someone can tell, from an engine(aan,7A,3b) is the camshaft?

No dizzy or cam sensor drive gear = AAN = ABY = ADU intake cam (all the same)