Camshaft install tips and tricks
(→Comp Cams's position on break-in additive and nitriding) |
(→Comp Cams's position on break-in additive and nitriding) |
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| − | + | George "Honker" Striegel (owner of Clay Smith Cams) said the following in an article on Ford inline 6 engines (to be taken with a grain of salt): Lets talk about that special treatment Comp Cams offers, for an additional $110 dollars. It's true that nitriding a cam raises the Rockwell hardness to 55-60, however they do nothing to increase the hardness of their lifters and most everyone will agree that it's the lifters that go first, then take out the lobe. In fact, the tech at Comp Cams told me that once the cam is broke in, the nitrided surface breaks down and eventually matches the hardness of the lifter. Right.... Clay Smith, Isky, Crane, and several others, experimented with nitriding several years ago. They found that nitriding offered no advantage, simply because they couldn't offer a lifter with the same hardness, at an affordable price. Yes, lifters can be made to match the hardness, but at a considerably higher price (which is probably why Comp Cams doesn't offer them). Next they discovered that a cam, or crankshaft, that had been nitrated was more prone to cracking due to stress resulting from flex and temperature fluctuations. Once the surface is damaged in any way, it cracks and eventually disintegrates, which accelerates wear at an even faster pace. And as expected, the mismatched cam and lifter hardness accelerates wear on the weaker component (lifters), which is true on all metal parts where the hardness is mismatched, such as distributor gears. On a final note, the nitrided cam carries the same warranty as a non-treated cam. If the process is as good as they say, why don’t they offer an extended warranty on the treated cams? | |
Cam manufacturers found the better solution was to produce cams cores with a higher nickel content, which raised the hardness to 42-46 on the Rockwell scale. By using lifters that match the hardness of the cam, which are affordable to produce, wear is greatly diminished. Today there are literally millions of consumers using high nickel cams, of which a very small percentage have had wear issues that are directly related to cam hardness. Cam failures, or lobe wear, can almost always be traced back to improper break-in, the use of cheaper motor oils, or the use of high volume oil pumps. As such cam manufacturers don't offer nitriding, simply because it isn't needed, especially if you use a good quality oil and follow the recommended break-in procedures, including a high quality break-in oil. On the other hand, if you insist on using a high volume oil pump and/or high pressure valve springs for boosted applications, then a treated cam might be better suited. Just be prepared to change out the lifters on a regular basis, which means pulling the cylinder head frequently, or spending several hundreds of dollars on chilled lifters. | Cam manufacturers found the better solution was to produce cams cores with a higher nickel content, which raised the hardness to 42-46 on the Rockwell scale. By using lifters that match the hardness of the cam, which are affordable to produce, wear is greatly diminished. Today there are literally millions of consumers using high nickel cams, of which a very small percentage have had wear issues that are directly related to cam hardness. Cam failures, or lobe wear, can almost always be traced back to improper break-in, the use of cheaper motor oils, or the use of high volume oil pumps. As such cam manufacturers don't offer nitriding, simply because it isn't needed, especially if you use a good quality oil and follow the recommended break-in procedures, including a high quality break-in oil. On the other hand, if you insist on using a high volume oil pump and/or high pressure valve springs for boosted applications, then a treated cam might be better suited. Just be prepared to change out the lifters on a regular basis, which means pulling the cylinder head frequently, or spending several hundreds of dollars on chilled lifters. | ||
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