Topic: engine block

[diesel]

Hi
what is the difference between a 124 CSA engine block 132 AC 4.000 and a Fiat 124 Spider/Coupe 132 AC 1.000 ?

thanks!

[guy moerenhout]

block ,I think is the same only conrods and pistons are different .Sometimes pistons are 84 our 86

[124Abarth]

Ok, no mistake.
One is the original 124 Abarth Rally engine block. (132 AC 4000) and the other is the 124 Coupé or the 132 GLS versions.
All the reference books explain that there are no differences and the engine block, as itself, suffers basically no changes. In fact the Coupé versions have a smaller diameter of the crankshaft end and a different PDC of the flywheel's bolts.
The flywheel's bolts are smaller than the Abarth version too. The Abarth version has the 14mm dia bolts and the Coupé version has 12mm dia bolts.
In fact the bigger difference between the two engines is in the timing of the camshafts.
I don't know if there is a difference between conrods but I think so. Probably they are lighter on the Abarth Rally version.
As an option a set of Titanium conrods was available of the shelf.
About the pistons diameter the two engine block leaved Torino with 84 mm bore, so everything else was an ex work job (ABARTH, Corso Marche, Torino) with the 232 engine block (86 mm bore) or an other privateer that tried to do the same.

Spartaco

[diesel]

Dear all
thanks for your comments!

I asked this question because i detected the 132 AC 1.000 number on my 124 CSA Abarth. The cylinder head with camshaft are Abarth, according the Fiat garage. He said, pointed Abarth camshaft are mounted.

Is there a possibility to check if the crankshaft is Abarth by removing the oil pan? I don't want to remove the gearbox to check if the flywheel's bolts are 14mm or 12mm.   Or is there another possibility to check if i have an Abarth 124 rally crankshaft on my engine block??

thanks and Merry Christmas!!   

[124Abarth]

Hello

No way to identify the crankshaft without removing the gearbox. Leave it as it is, you will never feel the difference. As you have to change the clutch, the gearbox must be removed. Wait until you have to do this operation.

Best Regards

Spartaco

[pneter]

I've just verified on my engines:
132AC.4000 has 10mm flywheel bolts
132AC.1000 has 10mm
154A.1000 has 12mm (8VCroma turbo)
154E.1000 has 12mm (16VCroma)
Between 132.AC.4000 and 132AC.1000 cranks are the same, bearings, pistons and ring sets are the same. The only thing I can see different is a different part number for the con rods, 123AC.4000 engine rods being Fiat# 4305890. 132.AC1000 being Fiat# 4287880.  I Don't know about the actual geometrical or material difference between these rods.

Cheers!