Balancing

wrote
... (A great article.)

Wow.

Could you explain more about the thermal dispersant that goes
inside of the pistons?

--

FF

Mr. Hoover,
I very much enjoy your posts. Thank you.

Dan Horton

wrote:

Could you explain more about the thermal dispersant that goes
inside of the pistons?
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I'm using TechLine coatings. I suggest you go to the source:

http://www.techlinecoatings.com

The code for the thermal dispersant is 'TLTD.'

Cast aluminum heads for the Type I VW engine show a 5% to 7%
improvement in heat transfer (depending on the core temp) when they are
blasted with coarse media and treated with TLTD. (I also apply it to
the push-rod tubes, valve covers and the floor of the valve gallery.)
It has to be baked on and unless you're into coatings (or want to
devote a couple of years to it) it's best to send your parts to one of
the shops certified by TechLine.

Although coatings are slightly miraculous don't expect miracles from
using just TLTD. It works best in conjunction with a thermal barrier
coating on the other side of whatever you've applied it to. The TBC
reduces the amount of heat that get into the part; the TLTD helps get
rid of any that does. Net result is that you can keep the core
temperature of the combustion process hotter, longer, meaning you'll
see a higher BMEP (and more torque because of it) but without
exceeding the engines inherent thermal limitations.

Alas, there's no such thing as a free lunch :-) The waste heat that
didn't go into your heads & pistons has to go somewhere... which is
into your exhaust and the oil coming from the valve galleries. The HVX
mods (see the archives of the AirVW Group) address the first issue
while insulating the stacks (Black Satin, Cerama-Chrome, etc.) takes
care of the second.

-R.S.Hoover