What is the best charging and ignition system for wide case 450

[graeme]

Or for a 450 half a degree retarded to save your ankle
I have Sachse on my RT set at 1/2 degree retarded, starts fine with no kick back.

Graeme

[Duccout]

Here is a question: why is the 450 engine timed to 28° BTDC, but the early 860/900 engines (with identical cylinder heads to the 450) were timed to 35°? Strangely, with the introduction of the Darmah, Ducati retarded the timing to 32°, and later, with the very last 900 engines (still with the same piston/combustion chamber) they retarded it further to 28°.

[Ventodue]

Or for a 450 half a degree retarded to save your ankle

. You know, Graeme, I've only once had my SCR kick back - and that was my fault, for not kicking it like I meant it ...

Lucky, eh?

[Ventodue]

Here is a question: why is the 450 engine timed to 28° BTDC, but the early 860/900 engines (with identical cylinder heads to the 450) were timed to 35°? Strangely, with the introduction of the Darmah, Ducati retarded the timing to 32°, and later, with the very last 900 engines (still with the same piston/combustion chamber) the retarded it further to 28°.

Mystery .. different valve timings? Dunno. Definitely one for the engine designers, Colin.

[HMBAtrail]

but the early 860/900 engines (with identical cylinder heads to the 450) .

Huh?

[Duccout]

!!! Same valves, same combustion chamber, same piston shape.....Different ignition timing.

[graeme]

Perhaps saving the big ends from pre ignition and damage ?

Graeme

[Duccout]

Definitely true that an advanced ignition timing gives the bottom end a harder time.

[DBDBrian]

!!! Same valves, same combustion chamber, same piston shape.....Different ignition timing.

Are the connecting rods a different length ?

[Duccout]

Probably - 450: 75mm stroke, 860:74.4mm stroke.