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michla
Samba Member
Joined: January 17, 2003
Posts: 331
Location: Wasilla, AK (yes, there's drag racing up here !)
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 Posted: Sun Feb 01, 2009 5:35 pm Post subject: Outside diameter of OEM Valve Guides on 1600 head ? |
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I'm replacing some of the valve guides on my 1600-based head (yes, I know what I'm doing), but so many aftermarket silicon-bronze valve guide manufacturers refer to OD of an OEM VW valve guide as "Standard diameter", with 1st, 2nd, etc. oversize OD meant for a broached out guide hole in the head.
Ok....great, so WHAT is "Standard" OD?" I removed the guides from my head, and the hole measures 12.091mm (or .476"). One cannot know which oversize --if any, they'll need until the guide is removed, of course.
thanx |
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morymob
Samba Member
Joined: November 09, 2007
Posts: 4683
Location: east-tn
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| Posted: Mon Feb 02, 2009 5:20 am Post subject: |
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| Chances of u having oversize guides are about zero to none,i have never run into any on the heads i have replaced the guides. |
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keifernet
Samba Search & Rescue
Joined: May 11, 2002
Posts: 19395
Location: Samba Center for Behavioral Science
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| Posted: Mon Feb 02, 2009 7:27 am Post subject: |
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| morymob wrote: |
| Chances of u having oversize guides are about zero to none,i have never run into any on the heads i have replaced the guides. |
I beg to differ... they sell them for a reason! (and I have seen many a head that needed them.) If you do enough valve jobs on these old heads you will run into some. I try to keep some over sized of several different dimensions in my stash as you never know what you will need until you drift the old guide out and measure. |
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michla
Samba Member
Joined: January 17, 2003
Posts: 331
Location: Wasilla, AK (yes, there's drag racing up here !)
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| Posted: Mon Feb 02, 2009 8:29 am Post subject: |
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| I found an invoice last night of some of the work done on these heads--indeed two of the guides were "1st Oversize", but can someone tell me what size "Standard" is? in thousanths... I'm guessing 12.000. |
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