Exhausting back pressure ... not the VX!!!

[tom4bren]

I was putting a new O2 sensor in Boy's Samurai. The threads in the manifold were goobered up & the new sensor wouldn't thread in. I filed off the threads on the new O2 sensor and used some high temp epoxy to bond it in place.

A week later the sensor blew out of the hole.

I borrowed a tap to clean the threads on the manifold so I'll be able to fix the problem correctly but it does beg a very important question:

Doesn't that seem like a LOT of back pressure on the exhaust? My past experience with high temp epoxy is that it generally sux but holy carp, that sensor shouldn't have blown out that quickly.

Do you think I'm looking at replacing a clogged catalytic converter? Thoughts??

EDIT:

Interesting read if you have the time.

http://www.nsxprime.com/FAQ/Miscella...austtheory.htm

EDIT Again:

Looks like this guage reads from 0 to 8 psi. So I guess normal is somewhere in that range.

http://www.nationaltoolwarehouse.com...ge-P32592.aspx