RE: pipe resistance
Is there more than one style of No Leak Manifolds being
sold with different o-rings? Some of the descriptions on
these o-rings appears to be conflicting.
I got my No Leak Manifold from ZippKits. It shipped with
two green o-rings that look the same size at first glance
but they are not. One is 3mm thick and the other is 3.5mm
thick.
It wasn't until I found the installation instructions I
posted earlier (I did not write those - someone else
posted them and they sure helped me) that I could figure
out how to assemble it. Once the o-rings are in the correct
positions it goes together easily.
After I found out that there was a half milimeter difference
in thickness, I tried to measure them before they were
exposed to fuel or heat. Here are my measurements:
#1 - 3.0mm thick; 22mm ID; 28mm OD (slips on header)
#2 - 3.5mm thick; 21mm ID; 28mm OD (inserts in housing)
The fact that the OD is the same on both makes it easy
to assume (just like I did initially) that there is no
difference.
I have not needed to relieve anything on my No Leak Manifold
to get a tight seal but I can see where that could be
benefical. I have installed and removed my manifold several
times and it seals well every time I put it back on.
I once thought the colors of these rings was an industry
standard and we could always tell the composition by the
color. Not true. I did some searching on different
o-ring manufactuers pages and the truth is they can and
do make practically any composition in any color they
want. Don't take my word - check it out. There may be
composition tendencies based on color but there is no
industry wide standard using colors to indicate composition.
I did not belabor the composition issue when on the phone
with Maston's. He recommended a combination I'm not familiar
with and I told him I would be glad to try it his way.
I agree that Viton is an excellent choice - good resistance
to petrolium products and good heat tolerance.