75 Twinspark rotor arms and compression test

[jonathan coates <alfa@xxxxxxxxxxxxxxxxx>]

After fitting the new Dizzy caps and getting a small result in reducing
the coughing of my 75 Twinspark, John from Denmark (I think) told me the
part numbers for the rotor arms. I got the Lucas versions and fitted
them today, they even have "made in Italy" on them.
The original ones were glued on, however the new ones fit and have keys
to stop them spinning on the shaft.
Now the question, why were they glued on? Is it just to sell
distributors?
Will I find out soon why, and will it cost lots of money?

The part numbers, for those interested are:-
Bosch 1234 33 2370
Lucas DRB 512

The car is still coughing a bit - next stop injectors.

Todays diary Alfa content
Took the 33 to a mechanic today as a new clutch in this looked like
chequebook time, the engine, gearbox etc come out under the car and I
dont feel equipped for this, nor solvent enough to buy a lift. The
mechanic had a new GTV for his company car and a 3 litre 75 (Milano
Verde) as a works van. When the 33 is cured I will let him loose on the
164, which he thinks may be rebuildable rather than needing a rebuilt
engine, then if the 75 still isn't going well he'll have a look at that.
The challenge is there, I have to find the fault and cure the twinspark
as it's going to cost money soon.
His works van is possibly for sale so an upgrade is maybe on the cards,
a different body and additional litre might cure it altogether!
Anybody know what the compression test should show? Mine are all about
10 bar (150psi) after two strokes, pumping up to 12 bar if I leave it
cranking for more strokes. Is this good?
- -- 
jonathan coates

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