Hello,
I'm looking for your opinions on an idea..
The Alfa transaxle system as used in for instance Alfetta's, Giulietta's and 75's uses a flywheel upfront. A 2 piece propshaft with 3 rubber couplings connects it to the clutch and gearbox in the rear. Like this;
![](https://img.retro-rides.org/i/v/giuliettaevo/860558e337e5.jpg)
If one would now want to use a different engine to this setup what would be the best way to make an adapter?
The new engine has an automatic flexplate like this;
![](https://img.retro-rides.org/i/v/giuliettaevo/dcd2e6ab1c36.jpg)
And needs to be connected to a propshaft like this;
![](https://img.retro-rides.org/i/v/giuliettaevo/f5c158a0b10f.jpg)
My idea would be to make an adapter that bolts to the crankshaftbolts and the propshaft bolts to that directly. Since that would require only a small diameter adapter it would mean the ringgear part of the flexplate has nothing to be mounted too. It would be the easiest adapter to make and also the lightest.
The other option would be to make a much wider adapter that actually fills up the whole flexplate so the ringgear can be bolted to it. This adapter can be mounted with bolts on the outer diameter (original for the torque converter) and go over the flywheel bolts or use the flywheel bolts as well. Using the flywheel bolts as well would make it a more complicated adapter to machine but would also be more rigid.
I don't like to use aluminium for the adapter as the propshaft uses only 3 14mm bolts to connect. So it will be steel. The wider option would be a lot heavier.
I'm leaning to the first option but i'm not sure about the 'loose' ringgear... Could it cause balance issues or something else?
Look forward to your opinions..
Kind regards, Remco
I'm looking for your opinions on an idea..
The Alfa transaxle system as used in for instance Alfetta's, Giulietta's and 75's uses a flywheel upfront. A 2 piece propshaft with 3 rubber couplings connects it to the clutch and gearbox in the rear. Like this;
![](https://img.retro-rides.org/i/v/giuliettaevo/860558e337e5.jpg)
If one would now want to use a different engine to this setup what would be the best way to make an adapter?
The new engine has an automatic flexplate like this;
![](https://img.retro-rides.org/i/v/giuliettaevo/dcd2e6ab1c36.jpg)
And needs to be connected to a propshaft like this;
![](https://img.retro-rides.org/i/v/giuliettaevo/f5c158a0b10f.jpg)
My idea would be to make an adapter that bolts to the crankshaftbolts and the propshaft bolts to that directly. Since that would require only a small diameter adapter it would mean the ringgear part of the flexplate has nothing to be mounted too. It would be the easiest adapter to make and also the lightest.
The other option would be to make a much wider adapter that actually fills up the whole flexplate so the ringgear can be bolted to it. This adapter can be mounted with bolts on the outer diameter (original for the torque converter) and go over the flywheel bolts or use the flywheel bolts as well. Using the flywheel bolts as well would make it a more complicated adapter to machine but would also be more rigid.
I don't like to use aluminium for the adapter as the propshaft uses only 3 14mm bolts to connect. So it will be steel. The wider option would be a lot heavier.
I'm leaning to the first option but i'm not sure about the 'loose' ringgear... Could it cause balance issues or something else?
Look forward to your opinions..
Kind regards, Remco