Chrome plating crankcase

Been spinning the cranks in the case with polishing compound and it seems to help.
I screw a prop stud in the crank and chuck it in a dremmel or drill.
They spin nice and free after.

crankbndr wrote:Been spinning the cranks in the case with polishing compound and it seems to help.
I screw a prop stud in the crank and chuck it in a dremmel or drill.
They spin nice and free after.

That answers the question I asked a couple of weeks ago. I cross posted at RCG and was told to use Turtle rubbing compound instead of valve lapping compound. I want to make two identical Killer Bees for the two Com Bats I got for Christmas.

I didnt post a few weeks ago because I dont know if im doing more harm than good.
My BW case is already shot after about 20 runs. Going after the air leaks really helps,
lap the tank to the backplate with the same compound, shorten screws a little to make sure
backplate pulls up tight. Good silicone gasket for venturi and seal backplate screws with RTV.

crankbndr wrote:...My BW case is already shot after about 20 runs....

I run my BWs pretty hard and they keep going. What kind of problems is your crankcase having after 20 runs?

The crank bushing is worn, been using 50 syn 50 castor think im going back to all castor.

Are you running high compression heads? I can see that causing faster wear, though a lot of people do it.

I'm blaming my glowplug problems on SIG fuel with 50% Klotz/50% Castor. In all of my reedies, they quit glowing after a few runs. Especially if they sit overnight. I spray them off with alcohol and they light up again. But it gets worse every time until they won't even restart hot, and I've retired a few of them. I bagged and tagged them for future inspection.

It hasn't happened in the Tee Dees so far, they seem to love the SIG fuel. When I use Glowplugboy fuel with 100% castor the reedies run much smoother and have no other problems. I can't think of any other explanation, but no one else on any forums reports that problem. Strange.

The SIG is so slick and oily it makes a greasy mess of the while plane. No more for the Bees, but I'll stick with it for the rotaries.

RknRusty wrote:Are you running high compression heads? I can see that causing faster wear, though a lot of people do it.

I'm blaming my glowplug problems on SIG fuel with 50% Klotz/50% Castor. In all of my reedies, they quit glowing after a few runs. Especially if they sit overnight. I spray them off with alcohol and they light up again. But it gets worse every time until they won't even restart hot, and I've retired a few of them. I bagged and tagged them for future inspection.

It hasn't happened in the Tee Dees so far, they seem to love the SIG fuel. When I use Glowplugboy fuel with 100% castor the reedies run much smoother and have no other problems. I can't think of any other explanation, but no one else on any forums reports that problem. Strange.



The SIG is so slick and oily it makes a greasy mess of the while plane. No more for the Bees, but I'll stick with it for the rotaries.

Rusty,

That is strange,

I have run my BW with only SIG champion since it was new. I bought it in 1992. I still have the original head on it. I have only run it on 15% so maybe that's the reason?

Dunno........

Polish up the crank to a nice chrome like shine, maybe hit it with a Dremel to lighten it, but I think it would probably be best to keep any compound away from the case, its gonna wear and by lapping it, its gonna wear more.