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Piston looks like this right? -
07-19-2006, 06:24 PM
  Just want to make sure that's normal.... The brown/blackish crud on top is like built up on the piston, not burnt in or pitted. Or is that too rich? Suburban.Chicago.Rock.Crawlers
INDOOR.SERIES.CHAMPION 
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07-19-2006, 06:28 PM
Looks like burnt eggs on a frying pan
RB C6bb/O.S. Speed Hitec 5955 Futaba s9351 Jr Z-1 www.frontlinetec.com Soo easy a cave man can drive it Mooooooooooogen
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07-19-2006, 07:24 PM
to me it looks like you were running too lean, to rocco that's carbon build up from running too rich or not "clearing it out". Not talking for you roc, I just know that's what you think...lol
anything that is Burned (Black) in a RC motor, IMO, means it was too hot so it burned. My Sirio .18's piston wasn't black after 8 gallons. My Ebp5 piston was light brown after 4-5 gallons. My blown 2.5's piston was black.
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07-19-2006, 07:33 PM
a little rich and what fuel? od? looks like castor burning more than most brands.
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07-19-2006, 07:33 PM
I say fire the thing up and lets have are own version of hells kitchen on that piston. I can make a mean omelet!
RB C6bb/O.S. Speed Hitec 5955 Futaba s9351 Jr Z-1 www.frontlinetec.com Soo easy a cave man can drive it Mooooooooooogen
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07-19-2006, 07:39 PM
Quote:
--Then follow the rules! haha!-- -Tune
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07-19-2006, 08:00 PM
Looks a little rich...my $.02
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07-19-2006, 08:04 PM
Now I'm afraid to look inside my engines after using nothing but OD's....but I guess I better.
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07-19-2006, 08:12 PM
Quote:
OD is not bad fuel Dave... Dont be afraid  --Then follow the rules! haha!-- -Tune
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07-19-2006, 08:31 PM
Ehh it could be from being to rich, or it could be from running to hot. It looks alot like carbon build up from running rich and not hitting peak rpm's to clean it out often enough, but all the ripples on the black looks kind of like pitting, so i'm not to sure on this one.
-Pete
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07-19-2006, 08:40 PM
Carbon build up in a motor that's had like 2 gallons on it? Comparred to a 1/1 car with, say, 50,000 miles on it?
I can see a real car building up carbon, they all do it. They drive thousands of miles and most people don't get on them hard enough frequently. An RC engine is not a 1/1 engine and it's not driven the same way. I've seen Revo2K drive, he gives it all it has and then some. My initial thought when I saw the pic was he ran rich for awhile, had lube build up, then ran it hot making the lube burn. What makes burned black substance anyway? a cold, rich engine? The only way to burn things is give them too much heat.
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