RICH?

[HANSIL59]

I understand that popping, colored pipes, etc indicate lean, other than gas mileage and exhaust odor, what indicates running rich?

Also anyone reccommend a carb synch guage to rig to 6 input tubes?

[Skinhead]

Black Spark plugs

[98valk]

discolored pipes, excess fuel can start to burn after it leaves the exhaust port.

just posted this the other day in a few threads about carb sync.
twin max carb sync more accurate then gages
 http://www.ascycles.com/detail.aspx?ID=2146

search is your friend don't be afraid

[Bobbo]

Black Spark plugs

And sooty insides of the exhaust pipes.

[Bobbo]

discolored pipes, excess fuel can start to burn after it leaves the exhaust port.

just posted this the other day in a few threads about carb sync.
twin max carb sync more accurate then gages
 http://www.ascycles.com/detail.aspx?ID=2146

search is your friend don't be afraid

Excess fuel from a rich condition can only burn if there's an exhaust leak letting in fresh air.  Since virtually all of the oxygen is used in a rich mixture, it can't burn in the exhaust.

[tank_post142]

"Excess fuel from a rich condition can only burn if there's an exhaust leak letting in fresh air.  Since virtually all of the oxygen is used in a rich mixture, it can't burn in the exhaust."

just so you know: this only applies if you live in M.O. everywhere else on the planet. an over rich mixture is usually on fire as it exits the cylinder and continues to burn in the exhaust.

[Bobbo]

"Excess fuel from a rich condition can only burn if there's an exhaust leak letting in fresh air.  Since virtually all of the oxygen is used in a rich mixture, it can't burn in the exhaust."

just so you know: this only applies if you live in M.O. everywhere else on the planet. an over rich mixture is usually on fire as it exits the cylinder and continues to burn in the exhaust.

So, you're claiming a rich mixture burns much hotter than lean?  It would have to, if it is "usually on fire as it exits the cylinder"

To continue to burn in the exhaust, it would have to still have leftover oxygen as it exits the cylinder.  If this actually happened, the O2 and A/F sensors would be worthless, as they would detect the excess O2, and call for an even richer mixture.

Please let me know what planet/dimension you are from, so we can understand the physics there...   

[Warlock]

I understand that popping, colored pipes, etc indicate lean, other than gas mileage and exhaust odor, what indicates running rich?

Also anyone reccommend a carb synch guage to rig to 6 input tubes?

Pipes will turn more golden look when running rich and blue when running lean.
David

[Bobbo]

I understand that popping, colored pipes, etc indicate lean, other than gas mileage and exhaust odor, what indicates running rich?

Also anyone reccommend a carb synch guage to rig to 6 input tubes?

Pipes will turn more golden look when running rich and blue when running lean.
David

Chrome exhaust pipe color is only an indication of the temperatures it is subjected to.  Hot will turn them yellow, hotter is gold, still hotter is blue, and really hot is purple!

The only reliable way to tell A/F mixture is with a sniffer.

[Madmike]

"Excess fuel from a rich condition can only burn if there's an exhaust leak letting in fresh air.  Since virtually all of the oxygen is used in a rich mixture, it can't burn in the exhaust."

just so you know: this only applies if you live in M.O. everywhere else on the planet. an over rich mixture is usually on fire as it exits the cylinder and continues to burn in the exhaust.

... doesn't a "rich" mixture imply that there is more fuel in the mix than there is available oxygen to provide for "proper" combustion - my understanding is that  ideally 14.7 masses of air per 1 mass gasoline (stoichiometric mixture fraction)???  The unburnt fuel produces a soot because it is partially burnt and this shows up in  the exhaust, on plugs etc. 

If you have a "lean" condition you will have hotter combustion which leads to hotter conditions all the way through the system - exhaust etc.

[Bobbo]

"Excess fuel from a rich condition can only burn if there's an exhaust leak letting in fresh air.  Since virtually all of the oxygen is used in a rich mixture, it can't burn in the exhaust."

just so you know: this only applies if you live in M.O. everywhere else on the planet. an over rich mixture is usually on fire as it exits the cylinder and continues to burn in the exhaust.

... doesn't a "rich" mixture imply that there is more fuel in the mix than there is available oxygen to provide for "proper" combustion - my understanding is that  ideally 14.7 masses of air per 1 mass gasoline (stoichiometric mixture fraction)???  The unburnt fuel produces a soot because it is partially burnt and this shows up in  the exhaust, on plugs etc. 

If you have a "lean" condition you will have hotter combustion which leads to hotter conditions all the way through the system - exhaust etc.

That's pretty much it.  The soot is leftover carbon from the fuel.  The hydrogen part is usually evaporated, leaving behind the carbon.

[tank_post142]

bobo: take a look at what the pair valve does

[Bobbo]

bobo: take a look at what the pair valve does

It allows a small amount of air into the exhaust at idle to reduce emissions by diluting the exhaust.  It also allows any unburned fuel to finish burning, since idle is usually richer than mid and high circuits.  The amount of air is minuscule, and this is only an emissions device.  If oxygen were already present in the exhaust, this valve would be unnecessary.

[98valk]

"Excess fuel from a rich condition can only burn if there's an exhaust leak letting in fresh air.  Since virtually all of the oxygen is used in a rich mixture, it can't burn in the exhaust."

just so you know: this only applies if you live in M.O. everywhere else on the planet. an over rich mixture is usually on fire as it exits the cylinder and continues to burn in the exhaust.

... doesn't a "rich" mixture imply that there is more fuel in the mix than there is available oxygen to provide for "proper" combustion - my understanding is that  ideally 14.7 masses of air per 1 mass gasoline (stoichiometric mixture fraction)???  The unburnt fuel produces a soot because it is partially burnt and this shows up in  the exhaust, on plugs etc. 

If you have a "lean" condition you will have hotter combustion which leads to hotter conditions all the way through the system - exhaust etc.

WOT under load, engines need 12.7 to 13.1 to 1 air/fuel mixture to make full power and so u don't burn a hole in a piston. turbo and supercharge engines need to run even richer. This rich mixture is also used upon accelerating from a dead stop, otherwise no power and pinging will occur.
14.7:1 is only good for the EPA emissions. its no good for power or mpg.
 

[Bobbo]

"Excess fuel from a rich condition can only burn if there's an exhaust leak letting in fresh air.  Since virtually all of the oxygen is used in a rich mixture, it can't burn in the exhaust."

just so you know: this only applies if you live in M.O. everywhere else on the planet. an over rich mixture is usually on fire as it exits the cylinder and continues to burn in the exhaust.

... doesn't a "rich" mixture imply that there is more fuel in the mix than there is available oxygen to provide for "proper" combustion - my understanding is that  ideally 14.7 masses of air per 1 mass gasoline (stoichiometric mixture fraction)???  The unburnt fuel produces a soot because it is partially burnt and this shows up in  the exhaust, on plugs etc. 

If you have a "lean" condition you will have hotter combustion which leads to hotter conditions all the way through the system - exhaust etc.

WOT under load, engines need 12.7 to 13.1 to 1 air/fuel mixture to make full power and so u don't burn a hole in a piston. turbo and supercharge engines need to run even richer. This rich mixture is also used upon accelerating from a dead stop, otherwise no power and pinging will occur.
14.7:1 is only good for the EPA emissions. its no good for power or mpg.
 

Slightly rich is best for maximum power, stoichiometric is best for lowest emissions and better MPG, and slightly lean is best for MPG.

[GOOSE]

GOD.........I JUST LOVE THIS PLACE!!!!!!!  WHERE ELSE WOULD YOU BE ABLE TO LEARN ALL OF THIS EXTRA STUFF?

[Warlock]

I understand that popping, colored pipes, etc indicate lean, other than gas mileage and exhaust odor, what indicates running rich?

Also anyone reccommend a carb synch guage to rig to 6 input tubes?

Pipes will turn more golden look when running rich and blue when running lean.
David

Chrome exhaust pipe color is only an indication of the temperatures it is subjected to.  Hot will turn them yellow, hotter is gold, still hotter is blue, and really hot is purple!

The only reliable way to tell A/F mixture is with a sniffer.

If you run rich all the time it will turn golden and stay that color. Running lean is hotter which is blue to purple. True about a sniffer. Just saying a quick look at the color gives a indication of condition.
David

[98valk]

 
[/quote]

stoichiometric is best for lowest emissions and better MPG
[/quote]


not true.
 going leaner will do the same with much better mpg and sometimes lower emissions. look at airfuel ratio in relation to emission graphs.

[Ricky-D]

With the design of the exhaust pipe by Honda (a pipe inside of a pipe), it is folly to predict what the cause of the discoloration of the pipe would be except to say it is heat!

Lean or rich is simply conjecture!

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