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AAH vs AFC V6's
I was paging through the Bentley for my 100, and they actually list 3 V6
engines, the AAH, AAH/AFC and AFC. Here's the specs they list:
Engine Code AAH AAH/AFC AFC
Dates 11/91-8/94 8/94-5/95
5/95-
Liters 2.771 2.771
2.771
Output 174 hp 174 hp
174 hp
Torque 184 ft-lb 184 ft-lb
180 ft-lb
Bore 82.5 mm 82.5 mm
82.5 mm
Stroke 86.4 mm 86.4 mm 86.4
mm
Compression ratio 10.3:1 10.3:1
10.0:1
Valve timing:
Intake opens 4 deg. 10.5 deg.
10.5 deg.
Intake closes 42 deg. 45.45 deg.
45.45 deg.
Exhaust opens 42 deg. 37.5 deg. 37.5
deg.
Exhaust closes 2 deg. 2.55 deg. 2.55
deg.
Min. RON 95 95
91
Fuel injection MFI MFI
MFI
OBD yes yes
yes
O2S control yes yes
yes
Knock sensor con. yes yes
yes
3-way cat. conv. yes yes
yes
Exhaust gas recirc. no no
yes
They also have a little explanation on why the oil circulation was revised
on engines produced 8/94 and newer. It says it was revised so that the oil
pressure refief valve in the oil pump is on the "clean oil" side. The
advantage is stated that the oil pressure is now controlled from the oil
filter and oil cooler, so that the oil pressure available at those locations
is supplied via the pressure relief valve or from the oil pump. No mention
on why the larger filter though. On the subject of OBD I and OBD II, it says
that beginning 3/94, manual transmission FWD vehicles with the 2.8 V6 have
OBD II capabilities. Surprisingly, there is no mention of when the automatic
and quattro V6's switched over to OBD II.
Craig
'92 100S (78k)