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techtalk:ref:engmech01h [2018/09/19 03:10] hippysmack [Test Fitting Cams] |
techtalk:ref:engmech01h [2018/09/19 03:18] hippysmack [Test Fitting Cams] |
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| ====== REF: Engine Mechanicals - Sub-01H ====== | ====== REF: Engine Mechanicals - Sub-01H ====== | ||
| ====== Test Fitting Cams ====== | ====== Test Fitting Cams ====== | ||
| + | Factory fitting of the cams is (or rather was) all about noise control. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1840595)) \\ | ||
| + | By selecting the cam gears sized specifically for the engine they were going in, they could walk that fine line between noisy and too-tight. \\ | ||
| + | The noise from the gears being a tad loose doesn't hurt anything. Too-tight however can cause localized tooth heating and failure. \\ | ||
| + | So when you replace the cams with non-original cams, you just have to make sure you're not too-tight, which is why you should do a basic test fit. \\ | ||
| + | Aftermarket cams are all made on the loose side and you rarely get into trouble when using them. \\ | ||
| + | In 2000, they changed the tooth cut on the pinion connection to the #2 cam, to a "high contact ratio" design. \\ | ||
| + | This tooth design apparently got the noise level down to an acceptable amount without having to deal with multiple gear sizes. \\ | ||
| + | There's only one size for each. \\ | ||
| + | |||
| + | In 2001, this change was propagated to all the cam interconnecting gears as well. \\ | ||
| + | |||
| + | **To do a basic test fit of your cams**. \\ | ||
| Install all 4 cams in the gearcase with the pinion gear removed. \\ | Install all 4 cams in the gearcase with the pinion gear removed. \\ | ||
| Use a fair amount of assembly lube in the bushings and in the gear teeth. \\ | Use a fair amount of assembly lube in the bushings and in the gear teeth. \\ | ||
