Alfa V6 Bore and Stroke

[Chris J]

80mm x 66.2mm 2.0 12v 205bhp (Turbo)
88mm x 68.3mm 2.5 12v 163bhp
88mm x 68.3mm 2.5 24v 192bhp

92.5mm x 60mm 2.4 12v 190bhp (Ferrari Dino)

93mm x 72.6mm 3.0 12v 192bhp (210bhp Cloverleaf)
93mm x 72.6mm 3.0 24v 220bhp (230bhp Cloverleaf)
93mm x 78.0mm 3.2 24v 250bhp

'Just comparing dimensions/specs. of Alfa V6 engines (and one other type).

I take it you need liners and rods if converting to a GTA crank?, but in theory any of the Alfa V6s can be stroked to 78mm?

I see the Dino has a very short stroke, and almost the same bore as a 3.0 Alfa?

[strat6v]

Just the crank i think Chris. Could be wrong.

Dare say AH would sell the cranks seperate, look to be about £700 ish? plus vat?

[Chris J]

I'm just thinking that if it is only the GTA crank that's needed to increase from 3.0 to 3.2, it's a pretty easy off the shelf way of upping the capacity?

The day when Alfa (Fiat) wash their hands of obsolete engine parts will come sooner than you think. Maybe it's a good time to get your hands on a long stroke production crank, or two?

[Martin K]

I'm just thinking that if it is only the GTA crank that's needed to increase from 3.0 to 3.2, it's a pretty easy off the shelf way of upping the capacity?

The day when Alfa (Fiat) wash their hands of obsolete engine parts will come sooner than you think. Maybe it's a good time to get your hands on a long stroke production crank, or two?

If the crank has a longer throw you will of course need shorter rods! Think about it. If you didn't shorten the rods the pistons would come out of the top of the bore by 2.7 mm!

[Chris J]

If the crank has a longer throw you will of course need shorter rods! Think about it. If you didn't shorten the rods the pistons would come out of the top of the bore by 2.7 mm!

Of course Martin, you're right, and with a shorter rod and a longer stroke, the piston will be lower in the liner on two counts on the bottom of the stroke?

So a set of new GTA rods and a new GTA crankshaft. A good thing to buy now? They might be hard to find in the future?

I'd make do with 12 valves if it was one of these:

http://www.ahmotorsports.co.uk/photos/EMCSZeng.jpg

[tryphon]

Aren't 3.2lt engines using a different (GM/Korean) block?

[strat6v]

Thats the latest generation. The gta was similar to the 166