wrote:
If you are referring to the issue where some of the preheater systems,
when if left on constantly caused moisture evaporated from the hotter
parts of the engine to condense on the cooler parts (such as you
listed) and cause corrosion, well maybe that occurs. The dryers simply
blow dry air thru the crankcase eliminating (theoretically) moisture
from initiating corrosion. I think that many of the articles we read in
aviation publications take a very simplistic approach to research. I
don't think the charge that if you leave a preheater on 24x7 it will
cause corrosion has ever been proven or disproven adequately, as is
also true with many other things we read.

I agree completely that much of what we read about engine care is based
on folklore and speculation. I used the word "wonder". ;-)

DGB

snip

Dave Butler wrote:

wrote:

The 100 watt bulb trick is to merely place a drop cord with a 100 watt
bulb inside the cowl while parked and leave it on 24x7. This was first
suggested as a cheap and easy way to preheat, especially if 2 100 watt
bulbs were used. Simply put plugs or rags or such in the cowl openings,
place a blanket or 2 over the cowl, and while not as good as a good
preheater, did keep the engine at a temp above the desired level.

snip

I have to wonder whether the moisture evaporated from the
above-dew-point crankcase distills out on the below-dew-point rocker
arms and valve mechanism.