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 |
kconway |
Aug 3 2009, 02:38 PM
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#22
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Senior Member Group: Members Posts: 1,347 Joined: 6-December 04 From: Monrovia, CA Member No.: 3,231 Region Association: Southern California |
Doesn't this potentially change the valvetrain geometry? Lots of intricate measurements and perhaps resizing of the pushrods required?
Kev |
type11969 |
Aug 4 2009, 10:05 AM
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#23
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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 |
Doesn't this potentially change the valvetrain geometry? Lots of intricate measurements and perhaps resizing of the pushrods required? Kev No, this does not change the geometry. By clearancing the rocker by .060, the contact point of the adjuster to the valve stem (the swivel foot) will be in the same place as the contact point of the old adjuster screw. Therefore, no geometry adjustment is needed. Now if you are building a new engine then yes, you should check the geometry. But on an engine with the geometry already set, this modification would not make a change. |
ericread |
Aug 4 2009, 02:05 PM
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#24
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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 |
Doesn't this potentially change the valvetrain geometry? Lots of intricate measurements and perhaps resizing of the pushrods required? Kev No, this does not change the geometry. By clearancing the rocker by .060, the contact point of the adjuster to the valve stem (the swivel foot) will be in the same place as the contact point of the old adjuster screw. Therefore, no geometry adjustment is needed. Now if you are building a new engine then yes, you should check the geometry. But on an engine with the geometry already set, this modification would not make a change. So Chris, do you have an extra set of rockers that have been shaved .060? Is there anybody that does have these? I'm pretty handy with a wrench and a BFH, but I sure don't have a shop full of tools needed to create such a precise clearance. As of yet, no one has relplied that it's a bad idea. So why doesn't someone create a kit that includes the rockers, adjusters and maybe replacement springs? (IMG:style_emoticons/default/confused24.gif) Eric |
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