cam

J

Jim Brierley

Well-known member
Someone sent me a Burtz cam to be ground, but he didn't say what grind to put on it, or any message at all, not even how to contact him. Please help!
 
There must be a return address on the package. I would put a full race grind on it and return it.
 
Welding on the journals has the chance of warping the cam. Wouldn't it be better to press sleeve bearings in the holes and line bore them?
 
nkaminar said:
Welding on the journals has the chance of warping the cam. Wouldn't it be better to press sleeve bearings in the holes and line bore them?
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Cams are easily straightened using a set of Vee blocks, a dull chisel and a hammer to pein them. It is difficult and very time consuming to linebore and install cam bearings. Larger cam journal diameters are easier to achieve the same results IMO.
 
jeepguy1948 said:
A Burtz cam is a pretty good grind as it comes from the factory.
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It's a "Touring" grind. There is room for improvement.


Key Burtz Camshaft Specifications:

  • Lift: 0.340 inches
  • Duration: 248 degrees (seat-to-seat)
  • Lobe Separation: 113 degrees
  • Material: Nodular Iron
  • Bearings: 5-bearing design
  • Hardening: Induction hardened lobes (HRC 58/62), bearings/gear (HRC 40/52)
 
johnneilson said:
No
We want larger bearings to allow for more lobe lift without sacrificing torsional rigidity
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With larger journals you don't need to grind down the shaft diameter to get more lift.
 

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Thanks for all the suggestion guys, some good, some are just funny. I've done 25 or so Burtz cams, some for OHV engines, some for a hotter flathead. The Burtz is a good touring cam as-is for touring, much better than stock. They are cast and heat treated electrically, and Quite deeply. The first one I did, and the guy had it tested for hardness, and it was good. They grind like steel. It's not yours John, wrong first name. The came to me from Burtz, so had their return address. It hat his name on the tube, but the tube had been slightly damaged, and I could read only part of it.
 
Jim,

Glad to see you still paying attention.
I need another Cam and not looking forward to buying more 8620 stock.

Best to You and Kathy, John
 
Case hardening the lobes only sets up differential thermal stresses in the camshaft that will cause the shaft to require straightening once it cools. Case hardening the lobes is very necessary to reduce wear from the sliding friction of the valve lifters. Grinding previously case hardened lobes changes the stress distribution and will necessitate straightening the shaft.
 
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