8 Dowell flywheel drilling jig help

[leec]

Ive got a genuine vw 200mm flywheel i am going to get my local machine shop to resurface, lighten and 8 dowell.

Ive bought the drilling jig, butwhat size do I need to ask them to drill the extra 4 holes to (ream)

Its going on a 82mm cb crank if that makes any difference?

Lee

[Dougy Dee]

Check the Berg site. They had great instructions including drill and ream sizes for those units, with the ones they sold. Problem is getting the proper crush. I think th next one I do I'll ream the assembly to 5/16 then use an undersized 8mm on the crank to get crush.

[Jee Ent.]

I use a 7,9mm drill bit on both the crank and flywheel.
The 8mm dowels will get a tight fit in the crank without any other work. And won't come loose if done right. Remember to slightly countersink the holes before mounting the dowels.
Use a 8mm reamer to finish of the holes in the flywheel. A slight countersink is recommended here also.. 

Jee

[Dr P.]

Second that. I also use a 7,9mm drill to do the 4 extra dowells. I did it last time yesterday and measured the dowells to 7,96mm. They will not drop in, but a light tap with the hammer will drive them in and position them snugly. The hole is usually a bit larger than the nominal 7,9mm.
When getting the drill, shop for one that is precision grinded.

[Harry/FDK]

And keep the dowels in the freezer overnight. Makes life a bit easier.