911 Valve Adjusters for my Type-4 2.0L?, Good Idea or Bad Idea? |
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911 Valve Adjusters for my Type-4 2.0L?, Good Idea or Bad Idea? |
ericread |
Jul 30 2009, 03:49 PM
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#21
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The Viper Blue 914 Group: Members Posts: 2,177 Joined: 7-December 07 From: Irvine, CA (The OC) Member No.: 8,432 Region Association: Southern California |
Somewhere earlier I saw a comment that Jake had recommended using 911 Valve Adjusters in the Type-4 engine... Or maybe he had recommended against it. I can't remember.
Anybody out there have experience in this? My adjusters and adjuster nuts were pretty gnarled when I got my car a few years ago. Now with bi-monthly adjustments, I'm looking to replace them. Will the 911 adjusters fit the existing rocker arms? Do I need the same nuts? If I go ahead with this, should my properly adjusted valves run quieter? And is there any advantage to replacing the springs? As a result of some moderate leaky valve guides, my plans are to have the heads re-built this winter. Should I wait until the heads are rebuilt, or is there any reason I shouldn't go ahead with the adjusters, nuts and springs right now? Any thoughts? My thanks. Eric Read |
type11969 |
Aug 5 2009, 07:48 AM
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#22
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Senior Member Group: Members Posts: 1,231 Joined: 2-December 03 From: Collingswood, NJ Member No.: 1,410 Region Association: North East States |
I disagree. If you grind the rockers down ~.06" to allow enough room for the swivel feet to swivel, and you set your lash as you always have been in the past, then nothing has changed as far as the geometry is concerned. The adjuster contact face is .006" away from the valve stem and, because of that, the rocker angle relative to the valve stem is the same that it was before the porsche adjusters were installed. So, assuming the geom was correct from the start, there is no need to re-do it. You could use anything as the adjuster and the geom would remain the same because it is not a function of the adjuster shape, just a function of the distance/angle between the rocker and the valve stem (which hasn't changed).
Now if you used shims to space out the rocker shaft instead of grinding the rocker faces, then yes, you would need to re-do the geometry. -Chris |
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