Ron Hamp Posted August 7, 2006 any body that has bought the hot cam shim kits and has found some of them tto be soft can heat treat them some more i found heating them to a cherry color and introducing some carbon with the flame brings them about 10 points higher to read the same rockwell as a the honda shims about 65 Share this post Link to post Share on other sites
Baron Von Beard Posted August 7, 2006 I had no idea this was an issue. Is this only on the small shims? Share this post Link to post Share on other sites
Bustphat Posted August 8, 2006 RHC, We Rockwell tested Honda OEM, K&L & Hot Cams shims and found the following: OEM- 61-63 RC B scale K&L- 41-43 " " Hot Cams- 37-40 " " We also found that certain aftermarket valves that don't micropolish the tips but DLC coat the tip will effectively bury into the softer RC shims w/ aggressive lift cams. bustphat Share this post Link to post Share on other sites
smf919 Posted August 8, 2006 i am ordering the HotCams shim kit tomorrow. should i be worried? Share this post Link to post Share on other sites
Dark Posted August 8, 2006 I already have one lol.....should i be ? Although I did reshim all my valves when I put in the hotcam and they've been perfect ever since. Share this post Link to post Share on other sites
emoney Posted August 8, 2006 So are you wearing out shims Ron? Any particular spring rate and valve material combinations? Pretty much only Honda exhaust side right? Share this post Link to post Share on other sites
Dan CRF250 Posted August 8, 2006 pfft i just use the same shim everytime, take my serface grider with the automatic base and takes me about 30 seconds per .001 for each shim, not bad for free Share this post Link to post Share on other sites
Ron Hamp Posted August 8, 2006 even with the tip of the valve micrho polished and dlc coated they will wear into the softer shims also the dlc coated valve stems are hard on vale guides compared to crohmium nitride . Share this post Link to post Share on other sites
Bustphat Posted August 9, 2006 Sometimes it's hard to beat OEM quality. Honda's material & processing are second to none. It's a tough call when matching surface toughness values, too hard & the guides wear, too soft and goodbye valve stem Bustphat Share this post Link to post Share on other sites