Lynn E. Hanover

A few thoughts.



Never gasolene unless you are in the middle of a big field next to a shallow pond and have a trigger happy friend standing beside you with a 15 pound CO2 extinguisher pointed at you. You shouldn't have to set yourself on fire to know that it hurts like hell.



Oven cleaner works great, it just takes a while. If you don't plan replacing the bearing, be sure none of the oven cleaner gets on it. A caustic will attack the surface.



A course wire wheel works well just stay away from the corners and apex seal slot. A flapper wheel to remove that "as cast" look from the combustion chamber and Kerosene or stoddart solvent in a cleaning tank with 400 wet or dry sand paper. Then it should be smooth enough for polishing if you like.



Paul Yaw polishes his stuff up like chrome. I have no data that suggests there is an advantage there, but smoother would seem better at real high temps. Take a look.



http://www.yawpower.com His technical articles are just great.



Lynn E. Hanover

scathcart

After initial chemical dip and then brushing with a brass brush, I polish my rotors, beginning with sanding. Only difference I have noted is when taking engines apart later, there have been no deposits on the rotor faces, but then again, I also run premix.

jspecracer7

I use a wire brush.

rx7will

I use a 50/50 mix of water and castrol super clean degreaser. In about a day or so, the carbon slides right off. Dont leave it in too long, after about a week or so it the bearing starts of have deposits on them.

Apex13B

wire brush, elbow grease, and mineral spirits





a welding scratch brush will work great, they're about 6 inches long, or an angle grinder with scotch-brite insert

venomrx7

I got it figured out, scrape with paint scraper thing to get thick stuff off, then spray with foaming engine cleaner, scrub with brass bristle brush, dry, repeat with engine cleaner, then use 400 grit emory cloth, nice and shiney!!

boost_creep

I soak in "PURPLE STUFF" solvent overnight and then I use a tooth brush to scrub clean. Polishing will then be easier from that point on.

j9fd3s

i just use a razor blade to get off the big stuff on the face and then either keep cleaning or reassemble (its gonna get dirty again)

Jeff20B

Yeah, I reassembled an engine with dirty rotors. I paid attention to the apex seals to make sure they weren't stuck, but that's it. Nice and black.

amp

chem dipped them..

then used 220 through 600 grit..