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Old 02-09-2006, 11:34 PM
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camshafts

are hydraulic flat tappet cams more inclined to wipe out a lobe than a solid flat tappet camshaft. my reasoning here is that hyd grinds have 0 lash and a certain amout of preload vs. a solid profile has lash specs. just a thought, any opinions? Turbo

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Old 02-10-2006, 01:08 AM
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you adj. the hyd. at 0 lash and providing that you adj. it right and have the right springs it shouldn't happen on either one unless you adj. them too tight.also with hyd.'s you can have fast bleed lifters which give you even more room for error unless there on a huge cam.some cams like wolverine blue racer,have fast bleeds for all their cams.not sure how they do it since crane bought them out.i got one right before they changed the packaging and they still did it.so the answer is if you over tighten either one of them they will both do it
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Old 02-10-2006, 09:10 AM
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Quote:
Originally Posted by Turbo Terror
are hydraulic flat tappet cams more inclined to wipe out a lobe than a solid flat tappet camshaft. my reasoning here is that hyd grinds have 0 lash and a certain amout of preload vs. a solid profile has lash specs. just a thought, any opinions? Turbo
The wear doesn't occur on the heel of the cam, it happens on the lobe, where both types of lifters are under increased stress. The hydraulic lifter bleeds down a little each stroke and glides over the heel as it refills with oil.
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Old 02-10-2006, 12:29 PM
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Quote:
Originally Posted by Turbo Terror
my reasoning here is that hyd grinds have 0 lash and a certain amout of preload vs. a solid profile has lash specs.


On a solid cam, the lash specs are there for thermal expansion/valve, seat, & lifter wear. A solid ground cam has clearance ramps to take up this extra clearance, as well as adjusters on the rockers. A flat tappet hydraulic does not. Thermal expansion & wear are compensated by the action of the hydraulic lifter.
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