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Title: 8 Dowell flywheel drilling jig help Post by: leec on April 03, 2011, 13:23:43 pm 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 Title: Re: 8 Dowell flywheel drilling jig help Post by: Dougy Dee on April 03, 2011, 18:41:11 pm 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.
Title: Re: 8 Dowell flywheel drilling jig help Post by: Jee Ent. on April 05, 2011, 19:46:37 pm 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 Title: Re: 8 Dowell flywheel drilling jig help Post by: Dr P. on May 13, 2011, 13:55:24 pm 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. Title: Re: 8 Dowell flywheel drilling jig help Post by: Harry/FDK on May 16, 2011, 17:48:13 pm And keep the dowels in the freezer overnight. Makes life a bit easier. ;)
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