[urq] WR valve clearances

[Keith]

All
In the urq list tradition of answering your own questions.......Have since 
done some research on the net and it rather looks as though (as I had 
supposed) that Phil was right. It seems a larger clearance is needed when 
measuring cold, because of the uneven expansion rates of aluminium and 
steel. I'm still not entirely satisfied but as Phil was usually right I will 
go with it. I'll then get the engine warm and re-do it warm and then there 
can be no question.
Regards

Keith
87' WR

-----Original Message----- 
From: Keith
Sent: Saturday, February 16, 2013 10:36 PM
To: urq at audifans.com
Subject: [urq] WR valve clearances

Quick question for you because I have a mental block and can’t think 
straight about this:
I have to check the valve clearance gaps on my WR. The late Phil Payne’s 
excellent website has charts for warm and cold engines.
http://www.isham-research.co.uk/quattro/wr_tappets_warm.html
I will be doing my head off the car and so cold. The two charts show wider 
gaps for warm engines than for a cold one. Is this right or should it be the 
other way around? On a cold engine, won’t the gap shrink as the components 
warm up? So wouldn’t you want a bigger gap when doing a cold engine to allow 
for the fact that the gap will close up as the parts warm up?
Can someone please put an end to my confusion. I expect Phil was right but I 
can’t see the wood for the trees.
Many thanks

Keith
‘87 WR slowly going back together.
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