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12-21-2010 08:35 AM  9 years ago
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F3CWNB

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Napier, New Zealand

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Rust or varnish?

Ref the pic's of My YS91ST Piston & bearing been running on Cool Power LV 15% Nitro done about 10 Gallons.

1st I was disappointed about the amount of varnish on the piston etc, 2nd I was disappointed about the rusting on the bearing (not easily seen in the pic), bearing still feels smooth though...

Then I wondered if the varnish actually was "only varnish" or has the rust particles been mixed with the varnish???

I'm not sure if I like this Cool Power oil any more...

Then I see that the rear bearing in my YS91SR has lasted only two flights

Colin
'Life' is Looking Up!!!
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12-21-2010 05:30 PM  9 years ago
TheWoodCrafter

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Costa Mesa, Ca.

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That sure seems to be a lot of varnish.

It is hard to see the balls in that rear bearing.
All I see is the retainer and it looks like it is covered in varnish also. If the bearing is smooth I would say there is no rust on the balls, you just see varnish on the retainer.

I don't use Cool Power so I can't compare it to my motors but it sure looks like it has excessive varnish buildup.
Thanks, TheWoodCrafter
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12-22-2010 02:11 AM  9 years ago
Inspector Fuzz

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NLA

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The stuff on the piston is varnish. The stuff on the bearing is rust.
The bearing doesn't get hot enough to stain. It stays super cool from all of the fresh fuel in the lower crankcase. It doesn't get much hotter than the back plate.
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12-27-2010 01:48 PM  9 years ago
slickporsche

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American/Philippines

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Rust or Varnish
I totally see no rust. If it were that rusty, you better not do the submarine thing anymore. It is all the same color and is by all means varnish. However I have been wrong before. I have not gotten that varnished up with CoolPower 30% for many years. If it was me, it would be completly disassembled and checked to see exactly what it is on the bearings.

If you find out definitly let us all know on RR what it is. I would also stop running CP 30% if it causes problems like that. Problem is, that everyones situation is a little different, and then the climates are different around the planet.Lots of variables. I do think some of us run our engines too hard and that causes problems.

I also do not think that the current mufflers we use scavenge the heat very well, and certainly not like a tuned pipe.
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12-27-2010 02:13 PM  9 years ago
baby uh1

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St. James, Mo.

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If it's varnish it will probably wash off, If it's rust it won't.Anything is possible if you don't know what you are talking about!
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12-28-2010 05:25 AM  9 years ago
dkshema

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Cedar Rapids, IA

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Varnish for sure on the piston's crown. But are you using a castor-oil based fuel, or have you added castor oil to your synthetic lubed fuel?

Varnish formation comes from burning castor oil, not s synthetic lube.

Been running it a bit on the lean side?
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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01-02-2011 03:58 AM  9 years ago
F3CWNB

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Napier, New Zealand

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Varnish for sure on the piston's crown. But are you using a castor-oil based fuel, or have you added castor oil to your synthetic lubed fuel?
Never been on Castor. lean? Not by much if it has...
I have been using 15% Oil, but that should be OK, as it does not get too hot here in NZ.
'Life' is Looking Up!!!
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01-06-2011 04:44 AM  9 years ago
asm

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California

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Just something to keep in mind, baring parts in carburetor, the only component in a nitro motor made of iron is crank and bearing. The crank case, piston, connecting rod are all made of aluminum. Aluminum will rust, but the it produce white/grayish powder. So, what you see there on the crank case and piston is varnish.

If your motor is producing good power, I wouldn't to over concern with varnish. Some fuel have the tendency to stain aluminum parts in various colors. I don't remember which brand of fuel, but I did had a motor with blue hue on all its internal parts after it gone through a few gallons of fuel.

B
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01-06-2011 09:40 AM  9 years ago
MartyH

rrProfessor

USA

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Try Wildcat Fuels. Don't let naysayers talk you out of it. Try Wildcat and see what you think. I have no affiliation to Wildcat. I'm just a happy user. I never use afterun oil. I never run the engine dry of fuel and I store my helicopters inside the house. I never see what you show in the pictures. Try it and then compare.

Marty
http://www.martyhammersmith.com
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