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Measurements for a False Cam
Posted: Wed Jan 16, 2019 6:55 pm
by BRENT in 10-uh-C
Can anyone post a couple of pictures and/or some accurate measurements of a false cam that is used to set a K.R. Wilson Line Boring Frame??
TIA
Re: Measurements for a False Cam
Posted: Wed Jan 16, 2019 8:32 pm
by Les Schubert
Hopefully I can help you.
The “perfect “ distance from the center line of the camshaft to the center line of the crankshaft is 3.937” (based on my experience). Others may differ by a few thousandth of a inch, but will be close to this. This dimension will give you perfect gear mesh. So I have a “link” that I use to set the line boring bar in place. Because the T blocks have a considerable variation in the vertical location of the camshaft, using this method will cause the crank to have considerable variation in the horizontal location of the crank. This variation has never caused me any problems and has always given me nice running gears. I can send you some pictures tomorrow
Re: Measurements for a False Cam
Posted: Wed Jan 16, 2019 8:57 pm
by dobro1956
There are two listed on e-bay. They are both by the same seller or he has a double listing.
https://www.ebay.com/itm/K-R-KR-Wilson- ... ctupt=true
I have a diagram somewhere of the measurements, or I can measure mine tomorrow.
Re: Measurements for a False Cam
Posted: Wed Jan 16, 2019 9:11 pm
by dobro1956
Brent, I found my "somewhere" pretty quick
My scanner is not working so I just took come pics of the diagram. If you can not read all the measurements or need more info, let me know .. These measurements are of a KR Wilson false cam to use with a KR Wilson boring frame. ... other boring frames may use something different
Re: Measurements for a False Cam
Posted: Thu Jan 17, 2019 9:03 am
by BRENT in 10-uh-C
dobro1956 wrote: ↑Wed Jan 16, 2019 9:11 pm
Brent, I found my "somewhere" pretty quick
My scanner is not working so I just took come pics of the diagram. If you can not read all the measurements or need more info, let me know .. These measurements are of a KR Wilson false cam to use with a KR Wilson boring frame. ... other boring frames may use something different
Thanks Donnie. Mine is exactly like the one in the eBay auction pictures, and while I have not mic-ed mine, it looks very similar to the one you posted. It just looked like a 'homeshop-built' unit -and not like what I would have pictured the factory unit to look like. I appreciate your efforts in researching this for me. Thanks again!!
Re: Measurements for a False Cam
Posted: Thu Jan 17, 2019 11:24 am
by dobro1956
Brent, yes they are a simple lathe turned item. The only two critical measurements are the .999 shaft diameter, and the 1.375 diameter of the collar. The .999 is the size of the hole in the rear of the block for the camshaft brass bushing, and the 1.375 is the size of the hole in the block for the front camshaft bearing shell. Those measurements allow for a snug "sliding" fit in the holes. The KR Wilson boring frame is designed with "fingers/tabs" to slide against the .999 measurement and then bolt down to the block pan gasket surface.
have fun and be safe ....