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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Is a black exhaust normal?
01-15-2011 11:06 PM  7 years agoPost 1
gamegeek

rrApprentice

Richmond, Kentucky

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I bought a OS .50 engine from the classifieds here. It is supposed to have under a gallon through it. Looking at the exhaust it has black residue on it and the piston. The ring doesn't have any black residue.

Is this normal? I've been out of RC for a while and this just looked weird to me.

Thanks!

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01-15-2011 11:51 PM  7 years agoPost 2
Santiago P

rrProfessor

South West, Ohio

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Did the previous owner used fuel with castor oil?
That will justify it somehow, but in just one gallon?

The only way to find out if the engine was abused is taking it appart, and see if the black varnish cleans up easy. If it does and there are no scratches, you are good to go.

good luck

Santiago

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01-16-2011 12:48 AM  7 years agoPost 3
asm

rrVeteran

California

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Color the piston isn't a reliable indicator for determining if the motor was abused. Considering many fuel on the market stain internal engine parts because of the dye they used.

However, if the piston is completely black, not just dark brown, I'll call it BS if the engine has only 1 gallon through it.

B

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01-16-2011 12:53 AM  7 years agoPost 4
gamegeek

rrApprentice

Richmond, Kentucky

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Thanks for the replys.

I PM'd the seller and he said he would refund my money and apologized.

I'm glad the RC community is mostly great to deal with, we all make mistakes.

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01-16-2011 01:06 AM  7 years agoPost 5
Santiago P

rrProfessor

South West, Ohio

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However, if the piston is completely black, not just dark brown, I'll call it BS if the engine has only 1 gallon through it
That is a good clarification, castor varnish is gold to dark brown, not black. I was thinking the same about the one gallon story.

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01-17-2011 08:38 AM  7 years agoPost 6
slickporsche

rrVeteran

American/Philippines

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Motor Blood
When you see black coming from you exhaust,the is usually "Motor BLood". Your motor is dying a slow death. It comes from metal(aluminum) wear in the engine somewhere and needs to be checked out, by a careful disassemble of the engine.

Most of the time this comes from a frustrated person that is trying to start a flooded engine, and then forces it over, with an electric starter, and bending the connecting rod in the process, because of hydraulic lock. This happens alot.

When you buy and engine from the classifieds, it is best to assume it is a rebuilder. For instance if the average selling price is $100,you would want to have the engine for $60 tops. For me anyway. You might be willing to pay more, but not me. If it went much past $60 I would buy new. Anyhow, find out what the parts will cost to rebuild it, and subtract it from the Retail selling price. That will tell you how much to pay for the used engine.

Sorry for the long post, but!

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01-19-2011 01:26 AM  7 years agoPost 7
asm

rrVeteran

California

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When you see black coming from you exhaust,the is usually "Motor BLood". Your motor is dying a slow death
Boy, must you be so dramatic?? I prefer to call the black stuff "The soul of a motor".

B

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01-22-2011 03:33 AM  7 years agoPost 8
gamegeek

rrApprentice

Richmond, Kentucky

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Slick,

Thanks for the advice. I think I'll buy new now, but if I ever buy used I'll take the rebuild into account.

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01-22-2011 12:08 PM  7 years agoPost 9
helismash

rrKey Veteran

Gloversville, NY - Fulton

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When you see black coming from you exhaust,the is usually "Motor BLood".
Great way to put it!

Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL

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01-29-2011 09:22 PM  7 years agoPost 10
sonnyhad

rrProfessor

Holland,Mi

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I've bought motors here in the classifieds and most sellers are honest. I got an os 50 and have run it for 2 seasons so far with no problems, but I don't think is far from wanting a new ring!

Bald Pilots usually wear hats!

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