I'd try an ultrasonic cleaner with a good detergent. There are detergents
purpose made for removing carbon from cooking utensils.
Heated air will work as well but the temperature required will ruin the temper
of 6061T6
On Sep 15, 2016, at 9:08 PM, Robert Watzlavick <rocket@xxxxxxxxxxxxxx> wrote:
I looked closer at my 250 lbf aluminum chamber in preparation for the next
series of tests and there may be some coking deposits in the cooling
passages. When I shine a light at one end and look through the other end, a
few of the holes seem slightly darker than others so I can only assume that
is due to coking from the fuel (kerosene). Does anyone have suggestions on
how to clean up the holes? I was thinking of chucking up a wire brush in a
drill and running it down in the holes but a solvent would be preferable. Or
I could just use the original sized drill bit and run it through by hand to
try and scrape some of it off. I did come across a patent where you can heat
up the engine and run ozone through it to remove the deposits but that
doesn't sound like an "at home" project. At Space Access, I recall someone
mentioning that Naval Jelly (phosphoric acid?) will work.
The total run time of this engine to date is around 80 seconds.
-Bob