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Old 02-24-2004, 08:57 AM
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Cam buttons?????

Can someone please explain what the use of a cam button is for and what cams u would use it on and if every motor should have one or just specific ones?

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Old 02-24-2004, 09:34 AM
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The cam button sits at the nose of your camshaft, and butts up against the timing cover. It's meant to prevent the camshaft from "walking" forward and back in the cylinder block. Typically with a cam button you should also have some sort of thrust bearing, like a torrington bearing, or a brass thrust washer sitting between the cam drive gear and the front face of the cylinder block. If you have an existing cam button in place, check the face of your block for wear... or previous machine work. Sometimes if a cam walks real bad, you'll get excessive wear in this area, and people will try to shim it up essentially to reduce the walk... but this is all suspect of some strange valvetrain activity.

Hope this helps.

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Old 02-24-2004, 09:40 AM
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The cam button keeps the cam from moving (walking) a few thousands, due to spiral cut gears on the cam and dist. When this happens the timing moves from the org. setting.
for an everyday engine this will not be noticeable, but on an all out race engine it will.

Or if your going for precession, and every thing you can get out of the engine, then it is advisable to use one, it will not hurt anything to run it in any engine you want to.

Troy

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Old 02-24-2004, 09:43 AM
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Cam buttons are generally used on roller cams.

Flat tappet (i.e. "not roller lifter") cams have a taper machined in the cam lobes, which pushes the cam back into the block- keeping the cam from walking forward and keeping everything in alignment.

Roller cams (hydrualic and solid roller) do not have this taper. Without something to keep the cam in front-to-back alignment in the engine block, the cam will move around and things could get ugly (crash, smash)! Stock hydraulic roller engines typically have a plate bolted on the front of the engine keeping the cam from wandering forward.

If you are installing a roller cam in a non-roller engine block, you need a button to keep the cam from moving forward.

All the above relates to forward cam motion. In case your wondering, rearward cam motion is checked by the "freeze plug" that is installed in the cam bore at the rear of the block.
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Old 02-24-2004, 10:09 AM
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Cam buttons have been used for many years. Way before rollers became popular. A flat tappet cam will walk when ever the rpm changes.

Troy



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Old 02-24-2004, 07:14 PM
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good i learned somehting new. I was just making sure my new motor with the solid cam did not have to require a cam button.
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Old 02-24-2004, 08:35 PM
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for all out precision, buttons are great. the only thing i reccomend is to put some sort of wear or thrust surface on the inside of the timing cover. i've seen a couple that have worn right through the cover!
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