Good story, but I have one comment. Physics will tell you that when a ring or
cylinder is heated it will expand as it were a sheet, that is the OD will get
larger, and the ID will also get larger. If the alloy of the two samples is
the same the increase in OD will be the same. Granted, the thinner walled
sample will expand more quickly over time the two would be the same at equal
temp.
Glad your problem is solved, whatever the reason.
Herb Miller
1960 AN5
1962 BT7 Tri carb
1967 BJ8
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Michael
Oritt
Sent: Sunday, October 15, 2017 3:39 PM
To: Austin Healey
Subject: [Healeys] Pressure Release Valves--old versus new
Here's a pic of the two valves--the new one is on the left and though it may
not show in the photo there is .0010" difference in the wall thickness which I
believe allowed the new valve to expand when it got hot and jam in the
passageway, resulting in lower OP.
Best--Michael Oritt
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