[iston color, exhaust color  
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[iston color, exhaust color - 4/8/2004 1:11:23 PM   
zimzalahbim



Posts: 715
Joined: 2/12/2004
From: mobile, AL, USA
Status: offline 		i just read a thread in another forum, and someone was talking about brown streaks on the top of the piston, or inside the stinger being an indication of running too lean. i know that the piston in my hyper .21 is brown, but she runs with a thick stream of smoke always. i also just finished breaking in a nova rossi .12 engine, and the aforementioned brown stuff is in the end of the stinger of the pipe. i couldn't think that this engine was running too lean, because during the hear cycling phase of break in, brown, unburned oil poured out of the pipe. could the engine run too lean with all that oil pouring out? i do not have a temp guage, but monitor the engine temp, crudely, by spitting on the engine. i use 25% tornado fuel, bought in korea where they mainly only use this brand of fuel. anyhow, just wanted some confirmation that maybe the brown color symptom could be bunk. thanks
       Post #: 1

RE: [iston color, exhaust color - 4/8/2004 3:21:09 PM   
slodsm



Posts: 1670
Joined: 8/14/2002
From: Jacksonville, NC, USA
Status: offline 		Yes, color is really no indication of anything, oil stains are what causes the color. If you tear down a motor run with Blue Thunder, you will find everything the fuel touched on it path through the motor has made a dark dark green to brownish stain. Now if you see tiny pits in the top of your piston, that would be an indication of detonation which is a by product of running too lean, but the color itself really is not.

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Airing it out on the east coast.

(in reply to zimzalahbim)
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RE: [iston color, exhaust color - 4/8/2004 9:21:37 PM   
Homebrewer



Posts: 1335
Joined: 12/29/2001
From: Colorado Springs, CO, USA
Status: offline 		Smoke is not necessarily an indication of whether you are lean or rich. More and more fuel companies are making fuels that produce less visible smoke to preclude potential environmental issues that have surfaced in other countries. Also, different brands produce different levels of smoke.

(in reply to slodsm)
       Post #: 3

RE: [iston color, exhaust color - 4/9/2004 11:36:46 PM   
skyneverdie


 

Posts: 170
Joined: 2/12/2004
From: Brossard, QC, CANADA
Status: offline 		:O my Savage with stock motor....the piston surface is all black, the underhead is all black...... but the temperature is around 280 which is normal...

any clue?

(in reply to Homebrewer)
       Post #: 4

RE: [iston color, exhaust color - 4/10/2004 1:03:09 AM   
HondaCRX



Posts: 330
Joined: 11/10/2003
From: Lake Worth, FL, USA
Status: offline 		either still lean, or lack of proper ventilation

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Mazda RX-7

(in reply to skyneverdie)
       Post #: 5

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