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LSM Engineering

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cad500justin:
Anyone had dealings with them lately? They have my cam blank and have suddenly quit returning my calls and emails. I don’t want to order pistons until I know what the cam will be.

Frontenginedragsters:
I have no knowledge about that.
Good luck

cad500justin:
Follow up:
I was trying to bribe the secretaries there with expensive wine to simply find and ship me back my cam blank. A week later I get an email with an invoice for $1832 and that my cam is on its way home. (Still had no idea what specs it was ground to) cam shows up, with a cam card, everything looks as it should be but no notes about being ground for roller cam bearings. I can’t find much info on the web about the cam being special, but I’m pretty sure the journals need to be really hard. Anyone know if there’s a difference in cam bearing journals for roller bearings? I hit the corner of a cam lobe and a journal with a mill file and the journal felt noticeably softer. Starting to think that I got hosed big time.

32bantam:
$1832 ?!?!?!   WOW ...that must be some camshaft !!!!

denverflatheader:
cad500justin – am guessing your camshaft blank is an iron casting and not alloyed or billet steel (i.e. 8620).  Your camshaft is termed “chilled iron casting” and the chilling process hardens the camshaft blank to assure normal wear resistance.  During production, the casting will have all lobe areas flame hardened well into the core so the final lobe silhouette has a Rockwell hardness above 48Rc to meet industry specifications; could even be closer to 58Rc.  The camshaft lobes are under a different stress then the bearing journals, which explains your comparison of the two; guessing again since your camshaft blank is a one-off for racing, your lobes may have received additional treatment elements over the bearing journals.

Camshafts used for un-normal instances, for example in a racing application, alloy or billet steel is commonly selected for higher quality.  In either case, there should be no issues with your camshaft if the production adhered to industry standards.  Did LSM's recommendations prompt you to select roller bearings over standard camshaft bearing?  Alan

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