[Healeys] Pressure Release Valves--old versus new

[Herb Miller]

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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