Crank comparison

[lucky phil]

For those interested in 78 mm crank differences. On the left a Centauro and later Daytona crank. On the right a 78 mm Cali crank. I think the earlier Daytona cranks that used the standard rods also used the Cali version with the balance adjusted but as can be seen the difference between the Cali 78 mm crank and the Centi/Later Daytona cranks is a lot more than just a dynamic balance adjustment. The 78 mm Cali crank is just a heavier version at 8.3 kg compared to 7.5 kg for the Centi and later Daytona Cranks. No wonder the lighter Centi crank and single plate flywheel feels like a Ducati engine.







Ciao   

[jacksonracingcomau]

6.4kg 78mm crank for comparison

[jacksonracingcomau]

Giving this a bump
Reciprocating weight one of big changes in bike engines over the years
I’d be interested in late BB 8 valve crank weight, both Griso and 1400. Wouldn’t surprise me if Griso one was lighter than mine above even with longer stroke.
The v85 with 77mm stroke is fairer comparison, anyone got access to one of them to weigh ?

[lucky phil]

Giving this a bump
Reciprocating weight one of big changes in bike engines over the years
I’d be interested in late BB 8 valve crank weight, both Griso and 1400. Wouldn’t surprise me if Griso one was lighter than mine above even with longer stroke.
The v85 with 77mm stroke is fairer comparison, anyone got access to one of them to weigh ?

8V 1200 crank 7.1 kg

Ciao

[jacksonracingcomau]

8V 1200 crank 7.1 kg

Ciao

Lighter than your 8v but still heavier than what we did to 4v crank 30 years ago  (although offset by extra stroke)

I’m waiting for v85 , sweepstake ?
I’ll go 5.5Kg

[lucky phil]

Lighter than your 8v but still heavier than what we did to 4v crank 30 years ago  (although offset by extra stroke)

I’m waiting for v85 , sweepstake ?
I’ll go 5.5Kg

Yes surprisingly and more compact as well. I couldn't even guess at a V85 crank.

Ciao

[Rough Edge racing]

 I assume the long snout on the crank drives the cam has an alternator rotor hanging off the end. It has a roller bearing support in addition t the main bearings? Does it have any torsional problems?

[lucky phil]

I assume the long snout on the crank drives the cam has an alternator rotor hanging off the end. It has a roller bearing support in addition t the main bearings? Does it have any torsional problems?

No no support bearing. It seems to be fine spinning to 9000 rpm as a road engine. If I was building a race engine I'd either go total loss and lose the extension or run a Ducati Corse alternator rotor which is about 1/3 the mass of the road version.

Ciao