[Hans-Peter]

Hallo everybody,
I took a look around in the forum but the searching engine did not allow me finding the infos I need.
The question is very simple: I'd like to install a 164 Super/155 90mm crankshaft in a 2L GTV (115 series), does it need any other modification than shorter rods or pistons? Just to be clear, I have doubts expecially about the oil pump drive/pulley end of the shaft.
If anyone has experience of this swap, or can suggest topics where I can find an answer, it would be very nice.

Many thanks in advance.

Alberto

Did you do this modification?

 

[Hans-Peter]

What are reasons for using 155 crankshaft ?

My race car has 105 2litre motor with JE 10.5 pistons, I have a 75 TS and a 155 TS sitting in the shed, I am right in assuming that I can take 155 crankshaft ( 1.5mm longer throw ) use 75 rods ( 1mm approx. shorter than 105 ) and put them in my current motor and end up with .5 ish mm higher pistons ( assuming no valve interference ) space out the starter and I have 33cc bigger motor with a bit more compression?
Here's the real question though, are there any other reasons for using 155 crankshaft ? 33cc extra is nice and everything helps but I find it hard to believe that Alfa Romeo would have changed the motor solely to to get a little extra capacity,

 

[Hans-Peter]

Thank you for the photos helps a lot, good point .75 longer .

 

[Hans-Peter]

Since we people here with experience -- one more question , is the flywheel/clutch on the 155 8V the same as the 105? can I use it on a late 6 bolt crankshaft 1750 ? Was planning to compare with 105 units but sold the engines quicker than expected.

 

[Hans-Peter]

Thank you , pity but I suppose that would have been too easy.

 

[Hans-Peter]

Finally pulled the crank out of 155 motor , I note that a previous post mentioned drilling out crank for gearbox imput shaft, 155 crank already has a hole in it but no bronze bush as per 105 , is it necessary o drill it out to fit one?