Original VW engine sheet metal was painted s semigloss black, probably
because it was durable and inexpensive. If the fan and control vanes are
working properly, the cylinder tin ought to never get hot enough to burn
you - at least that's been my experience in Northern Illinois and
southern Wisconsin.
When I built my engines, I always gave the cylinder fins a single coat
of black enamel. No data on if it helped or hurt, but it looked nicer
than rusty iron when I had to go into the motor later on. I've never had
an engine overheat except when the firewall insulation came loose and
got sucked into the fan once.
Chuck Kuecker
On 4/19/2015 9:39 AM, No Quarter wrote:
We discussed thing a long time ago on the list and I think it was our
beloved Bob Hoover that did tests with chrome, paint of different
colours, and then subsequent temperature testing and it was found that
satin black finishes such as from paint kept the coolest
temperatures. Flat black paint on the heads may have been the study
I'm thinking of. Ah well blow it - my memory ain't waht it used to
be! There was some scientific reasoning behind it though.
Temperature samples were done with one of those laser gadgets where
you point-and-shoot. I was thinking the temp drop was 5 degrees, but
that 5 degrees coupled with everything else such as properly jetted
carburetor, thermostat, adequate air-flow, proper timing, etc. were
the overall key to keeping the engine cool. You start ignoring the
small temperature savings here and there and it ads up to a nice
burned out engine that still looks with the chrome on it (with a blue
tinge from overheating) LOL!
In the end it's your car and you run it the way you want. You just
have to decide how long you want it to run. If you like rebuilding
engines annually or even monthly, use lots compression, no thermostat,
no Hoover bit, stale air shrouds - in chrome - no bottom tins and no
tin between the cylinders on the bottom (because who needs 'em!
BAH!), and large P/C combos , cast stroker cranks in an align-bored
AS41, HUGE cams, and go have fun! You eventually start to envy the
grandma who can start up her stock VW and go for a leisurely Sunday
drive and has time to water her flowers. You won't have time to think
while she does. LOL!
NQ
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