Vanguard Camshaft Modifications

Petrosk

The photographs on the sticky thread ("Gov. Removal on 303447 Briggs") show the removal of the governor weights from the PTO side of the stock cam, but nothing is mentioned about the compression release parts on the lobe side of the cam gear.

Are the compression release external swing weight and spring left in place or are they removed along with the internal parts (the ball bearings and the actuator)?

If the compression release parts are not removed in a motor that has a rev. kit installed and is allowed to spin well past 5000 rpm, are they not also likely to find their way into the bottom of the crankcase at some point?

BGW

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Flintrock

Once you remove the rivets all the external parts come off. There is nothing I know of that removes the internal compression release "ball bearing" parts, except a new performance cam.

mopar92

Ok, so I'm about to go through this. I understood that the cam itself was the compression release. Now I'm learning there is an actual mechanism involved... What exactly needs to come out besides the weights on the cam?

shmitterton

The weights on the cam operate the governor, on the inner side of the cam gear is a completely separate mechanism that operates the compression release. The 2 ball bearings built into the cam lobes are what release the compression on start up, then when the engine developes rpm's the ball bearings recess into the cam to allow the lifters to travel along their normal path. If that makes sense. Remove the outer weights to remove the governing system, remove the inner spring loaded plate to disable the compression release. You also have to remove the governor shaft and fork from the crank case cover and plug and seal the hole. Good luck buddy.

mopar92

Easy enough, makes sense

rokcrlr

personally I would leave the compression release alone, makes for easier starting with the starter and if you take it off , forget about hand starting with the recoil. It doesn't cost you any power after it reaches rpm, other than a tiny bit of extra recip weigh on the cam.JMO

shmitterton

yes, what ^ he said. I'd leave it alone as well.

mopar92

I'm putting in a hot cam... So it's null at this point... My engine doesn't have a pull starter Either... It is off a commercial mower.

Flintrock

Get ready to consider a high torque starter.....or a heck of a battery.

brooklyn

what cam are you goin with?