RE: Alfetta motor sizes

["John Fielding" <johnf@domain.elided>]

A common thread running around about Alfetta motor sizes often erroneously
refers to a "1750" motor.  The 1750cc motor was never used in the Alfetta.
From my Alfetta Inspection Manual for the 1983 models.

There were only three different motor sizes offered in the Alfetta.  (As
John Hertzman correctly states the 1300cc motor was also never utilised
in the Alfetta series).

However there are subtle differences between the other motors.

The smallest motor was the 1600cc which was designated as 016.00 and had a
swept volume of 1570cc with a bore & stroke of 70mm x 82mm.  CR was 9:1.

Maybe some dislexic folks swapped the numbers around to get to 1750??

The 1800cc motor was designated as 016.78 and was in fact a swept volume of
1779cc with a bore and stroke of 80mm x 88.5mm.  CR was 9.5:1.

The 2L motor was offered in two versions.  These were 016.55 & 017.13, the
latter motor was the Motronic version, fitted here in the Alfetta 159i, with
Bosch
EFI.  Both of these motors used a common bore & stroke of 84mm x 88.5mm.

The Weber carbed version (although it was also fitted with either Dellorto
or Solex carbs from time to time) had a CR of 9:1.  The  Motronic motor had
a
CR of 10:1 and later 10.4:1. Potentionally the EFI version is capable of
much higher outputs but was developed to overcome the emissions issues
becoming common in most countries at the time which Alfa found difficult to
meet with carb motors.

The power outputs for each motor were as follows:
1600cc    109HP
1800cc    122HP
2000cc    130HP (both carb & EFI)

(My original 2L Weber carbed motor used Motronic pistons and a head shaved
to bring the CR up to around 12.5:1.  This motor running on 102 octane
racing fuel and with a radically altered pair of camshaft and other internal
modifications showed 136kW on the dyno (about 175HP). However it
showed an affinity to eat its oil control rings and I reverted to the
shorter stroke 1.8L motor for further racing).

All motors had the spin-on oil filter which was fitted on the exhaust side
of the block on the timing cover (below the alternator). The dipstick was
fitted adjacent to the distributor on the opposite side.

Incidentally on the thread of putting a 2L crank into an 1800 motor or vice
versa.  The bore centres of the two motors are slightly different and hence
this cannot be done without extensive machining to the block deck were the
liners fit.

I hope this interests some of the digestee.

John Fielding
Durban
South Africa

Alfetta 1.8L turbo -which however now uses a Guilletta motor!

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