Thanks for the responses to my recent post regarding the thickness of the
figure 8 gaskets. I've done a little more "digging" and these are my
results.
All of the steel ones I have of have gotten measure 0.015+. I recently
ordered some non-copper ones from British Parts Northwest and they are
aluminum and also measure 0.015+. These are the first aluminum ones I've
seen.
All the copper ones I have, including some used ones, measure 0.020+.
I contacted Moss US and asked about their copper ones and any problems.
They only had one report of water leaking, back in 2014. I was told that
maybe the copper 0.020 ones were supposed to compress. I hammered some
copper ones to 0.015 and they are twice as wide as the original and would
not fit between the liner and the block bore. Additionally, I don't think
there is enough force to compress them.
The Moss ones are from Moss UK and are now specified at 0.018 by BPNW. The
BPNW part number is the same as the Moss UK part number. I contacted Moss
UK by email but never got a response.
I also recently ordered a Payen lower engine gasket set and the figure 8
gaskets in it are steel and measure the 0.015+, as all of the other steel
ones.
The one engine builder that I know who uses the 0.020 copper gaskets
typically uses them on blocks that are decked with the liner seats cut to
allow the 0.003 to 0.005 stick out as specified by the Triumph TR4 Workshop
Manual, Pg. 1.121.
I am interested in anybody who is using the copper gaskets. Please post how
you are getting the proper stick out.
For myself, I will continue to use the steel figure 8 gaskets. I would also
be interested in anyone using the aluminum figure 8's. Any problems? What
did you get for stick out when assembled and the liners clamped in place?
Personally, I don't think I want to experiment with these.
Tim Murphy
1961 TR4 #317 (It really is a 1961 with an early Commission Number CT511)
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