Camshaft install tips and tricks
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Used lifters should only be used on the very same cam, in the very same block, and in the very same positions they were removed from. Chances that the lifter bores will be machined on the very same angles on a different block as the block the lifters came out of are about equal to you hitting the lottery. If you purchase a used flat tappet cam from a swap meet or yard sale, plan on using it for a doorstop. | Used lifters should only be used on the very same cam, in the very same block, and in the very same positions they were removed from. Chances that the lifter bores will be machined on the very same angles on a different block as the block the lifters came out of are about equal to you hitting the lottery. If you purchase a used flat tappet cam from a swap meet or yard sale, plan on using it for a doorstop. | ||
| − | == | + | ==Tools== |
| + | *[http://www.summitracing.com/parts/CCA-5003/ Lifter bore grooving tool] allows pressurized oil from the lifter galley to be squirted directly onto the cam lobe/lifter interface | ||
| − | + | ==Lubrication== | |
| − | == | + | That pencil-point of contact between the camshaft lobe and lifter crown is under somewhere between 250,000 and 300,000 pounds per square inch of pressure, so it should come as no surprise that extreme pressure lubrication is required, especially at break in where the contact point between lobe and lifter is irregular. The break in grease applied to the bottoms of the lifters and to the cam lobes is all the lubrication there is during the initial 5 to 10 seconds of operation, until motor oil reaches the interface. |
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===Comp Cams's position on break-in additive and nitriding=== | ===Comp Cams's position on break-in additive and nitriding=== | ||
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<blockquote> | <blockquote> | ||
''"Due to federal legislation, motor oils no longer contain certain anti-scuffing agents that played a critical role in flat tappet camshaft break in. While incorrect valve spring pressure and not following proper break-in procedure are often the culprits, the changes in oil formulation have brought about a need for additional steps to be added to the break-in process.'' | ''"Due to federal legislation, motor oils no longer contain certain anti-scuffing agents that played a critical role in flat tappet camshaft break in. While incorrect valve spring pressure and not following proper break-in procedure are often the culprits, the changes in oil formulation have brought about a need for additional steps to be added to the break-in process.'' | ||
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===Racer Brown's position on oil level during break-in=== | ===Racer Brown's position on oil level during break-in=== | ||
| + | Racer Brown is a world-renowned camshaft manufacturer/engineer who ground the hot cams for Chrysler Corporation during the horsepower wars of the 60's. | ||
<blockquote> | <blockquote> | ||
''"Overfill the crankcase by at least 4 or 5 quarts of oil so that the oil level comes to within an inch of the top of the oil pan. Install a set of fairly hot spark plugs with a gap of 0.050" to 0.060" to prevent oil-fouling of the plugs, which is otherwise inevitable under no-load conditions with all the extra oil aboard. During this operation, we want near-maximum oil flow, together with a maximum of oil vapors and liquid oil thrashing about in the crankcase so that the cam lobe and lifter interface lubrication is considerably better than marginal."'' | ''"Overfill the crankcase by at least 4 or 5 quarts of oil so that the oil level comes to within an inch of the top of the oil pan. Install a set of fairly hot spark plugs with a gap of 0.050" to 0.060" to prevent oil-fouling of the plugs, which is otherwise inevitable under no-load conditions with all the extra oil aboard. During this operation, we want near-maximum oil flow, together with a maximum of oil vapors and liquid oil thrashing about in the crankcase so that the cam lobe and lifter interface lubrication is considerably better than marginal."'' | ||
</blockquote> | </blockquote> | ||
| − | + | ==Lubricants== | |
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*[http://en.wikipedia.org/wiki/Molybdenum_disulfide Molybdenum disulfide] | *[http://en.wikipedia.org/wiki/Molybdenum_disulfide Molybdenum disulfide] | ||
*[http://en.wikipedia.org/wiki/Zinc_dithiophosphate Zinc dithiophosphate] | *[http://en.wikipedia.org/wiki/Zinc_dithiophosphate Zinc dithiophosphate] | ||
*[http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=159&Category_Code= Comp Cams Engine Break-In Oil Additive] | *[http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=159&Category_Code= Comp Cams Engine Break-In Oil Additive] | ||
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| − | *http://www.sirgalahad.org/tyler/misc/camdesign.txt | + | ==Resources== |
| + | *http://www.carcraft.com/techarticles/ccrp_1108_camshaft_break_in_guide/viewall.html Camshaft Break-In Guide - How To Break In That Flat-Tappet Cam] Car Craft, August, 2011 | ||
| + | *[http://www.sirgalahad.org/tyler/misc/camdesign.txt Cam design] | ||
==Crankshaft Coalition Wiki References== | ==Crankshaft Coalition Wiki References== | ||
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