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"Part of the job of the heat exchangers
is to "remove heat" away from the engine, not just to remove the exhaust
fumes."
.......I was always under the assumption
the heat exchangers' job was to "rob" heat from the
exhaust flow to heat the car.
"Since J-Tubes are less dense, thinner, and use metal
compounds that conduct heat faster than do the heat exchangers, it is
certain that you will increase the temperature below your cylinders."
..............The outer "jacket" or
"heat sink" on VW heat exchangers is made from
aluminum, which conducts heat FAR faster that steel.
My j-tubes will be either ceramic coated, which greatly
reduces the heat they give off, or coated with POR-20
and wrapped in fiberglass "header wrap".
"Not to
mention, the heat exchangers on a T3 are wrapped with a heatshield mesh, so
by using J-tubes, you are also sacrificing this heat-protecting mesh."
..........This "insulation", if i'm
correct, is more for the purpose of keeping the
heat IN so it heats the car more efficiently. The same
reason the OEM tubes that run from the exchangers to
the body are wrapped in it as well. I do very much
agree with you, however, that it would protect the
heads from excess heat...that's why I plan on ceramic
coating or fiberglass wrap.
"If the bottom of the cylinders is protected by the larger cooling tin (as
opposed to the smaller design found on earlier type 1's), this may not be as
much of a problem."
............. I'm running factory
"super cool" tins on my Fastback because of the hot
climate here.
"But regardless of cooling tins used, cylinder #3 is
going to run even hotter, running a greater risk of cooking your engine."
......I was always under the
impression that heat exchangers made #3 and # 1 run
hotter than #2 and #4 due to that fact that exchangers
are a "heat generator" ,not allowing the exhaust heat
to travel out the muffler, but retaining it in one
area. Also they are more restrictive than the larger
I.D. j-tubes, causing more of a heat retention
problem. I really enjoy hearing all the different
opinions. It helps make more informed decisions.
Thanks everyone, keep 'em coming!!!
Marc
1967 Fastback
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