Hello,
I'm going to test my new Lunati cam (302A7LUN)and lifters (LUN-71817) and try to make myself more comfortable with the fact that they have been properly heat treated. I figure since I have the means to test them why not. Just one more known before I put them in the engine and start it. So with all that said what is the hardness of the lobe face and the lifter face supposed to be?

Thanks, Lance

Try this tread from another board
http://www.nastyz28.com/ubb/Forum8/HTML/008332.html

MaTt

Depending on the cam it should be 60 or more on the Rockwell C scale. That should put it at file hardness if you don't happen to have a Rockwell tester. Use a file to test each lobe. The file shouldn't cut.Remember the Rockwell test is a destructive type test that will leave a dimple on the lobe you will have to polish out.
Mark

Matt,

Thanks for the link.

Mark,
I work for a big company with lots of nice stuff that I can use. I knew that it marks the material being tested so I figured I'd test it on the heel of the lobe near the edge where the lifters don't run.

Lance

No you don't b/c that little dimple in some lifters you run across that are still new is caused by the hardness test as a factory QC deal..

pdq67

I was recently educated the hard way on cam and lifter hardness. I had two failures and the culprit was soft lifters. The lifters should be
over 50 in Rockwell hardness and the cam at least 60. At least that's the info that I've gathered.
The cam guys get their lifters from a mutual supplier or two and who knows if they come from off shore. The lifters with a pinhole on the bottom for extra cam lubrication is a great idea.
As you know rollers don't pose those problems. :cool:

Lance, the cam is not hard all the way through just the surface so be carefull where you test to get the Rockwell reading!
Mark

OK,
Now you guys have me worried about where I dimple this thing to get a hardness reading. What do you think about testing it between the actual lobes? I'm thinking it should be just as hard there as it is on the surface of the actual lobe. Opinions... Harold I could use some input from a expert! Are you on vacation this week? I seem to remember reading something about you going on vacation. Anybody else remember when Harold was going on vacation?

Thanks, Lance

Well I tested it. The lifters were all harder than RC58 and most were at least RC60. The cam was according to the inspection person not going to give us an accurate reading because of the surface texture on it. He said that any reading we got would be low on the scale of hardness. So after all that the readings were all within the 48-50 range on a C scale. So I'm pretty happy. I know it was heat treated and I'm confident that barring problems I'm going to have a "good" cam experience smile.gif .
Thanks for all the input on this, Lance