3.0 dizzy differences

[speedo]

I realize that 3.0 dizzies spin ccw, but just learned that their curves are different. Is it the difference between US and Euro engines? Can they be easily re-curved? And does it matter which core dizzy is used when they are converted to twin plug? Final question...who are our options for twin plug conversions these days?

[Zuffenwerker]

Here are the advance curves for the SC distributors
The distributors can be recurved pretty easily by a distributor professional. I recently had an SC dizzy completely rebuilt and recurved for carbs for under $400. Supertech sells twin plug distributors for SCs and will take your stock dizzy as a core.

Daniel Journey


3

[icarp]

I think the best distributor option for our 911's is from the 123ignitionusa.com the bluetooth model
Remember all factory advance curves were set for EPA standard , not performance
These curves are advance at the dist not the crank, so double the distributor advance and you have crank advance
The dist turns at half the crankshaft speed , so x2 for advance.
The 3.0 likes a max advance of about 30-32 total advance btdc depending on fuel , compression and elevation. I'm at 6000' and 9 to 1 compression and I run 32* all in
Ian