27 replies to this topic

[Dan]

Water is the main product of burning hydrocarbons! Along with CO2.

Not energy then?

[Sprocket]

Water is the main product of burning hydrocarbons! Along with CO2.

CO2 is the main 'by product' of burning hydrocarbons, discounting N2, since it is N2 as it enters the cylinder, is N2 as it leaves the cylinder, therefore not a 'product'.

N2 71%
CO2 14%
H2O 12%
CO 0.2-2%

Edited by Sprocket, 06 April 2012 - 06:58 PM.

[R1minimagic]

Water is the main product of burning hydrocarbons! Along with CO2.

Not energy then?

Energy is not a molecule!!

[R1minimagic]

In chemistry 'by products' are minor constituents, so in your example above CO would be a 'by product'

And nitrogen does not really take any part in the reactions, only forming relatively minor molecules of NOx

[Sprocket]

In chemistry 'by products' are minor constituents, so in your example above CO would be a 'by product'

And nitrogen does not really take any part in the reactions, only forming relatively minor molecules of NOx

Nitrogen is not a byproduct of combustion since it is there before and after combustion. I thought that is what I said?

Byproduct Definition: A substance that is formed as the result of a chemical reaction

The product of combustion in an Otto Cycle engine is heat and the resultant pressure increase. Everything else is a by product.

[Dan]

Energy is not a molecule!!

Ah well it's that attitude that makes physics the only real science!

[holmesy]

my favourite by product is the roar!!!!!!!!!!!!!!

[Bungle]

my stainless RC40 exhaust is now about 18 years old and is as good now as the day i bought it

stainless is worth the extra money

[Sprocket]

my stainless RC40 exhaust is now about 18 years old and is as good now as the day i bought it

stainless is worth the extra money

modern stainless steel should really be called stainable steel

[cliche]

my stainless RC40 exhaust is now about 18 years old and is as good now as the day i bought it

stainless is worth the extra money

modern stainless steel should really be called stainable steel

not as good then as the older stuff then ?

[R1minimagic]

In chemistry 'by products' are minor constituents, so in your example above CO would be a 'by product'

And nitrogen does not really take any part in the reactions, only forming relatively minor molecules of NOx

Nitrogen is not a byproduct of combustion since it is there before and after combustion. I thought that is what I said?

Byproduct Definition: A substance that is formed as the result of a chemical reaction

The product of combustion in an Otto Cycle engine is heat and the resultant pressure increase. Everything else is a by product.

Concise Oxford English Dictionary © 2008 Oxford University Press:
by-product ▶noun

• 1 an incidental or secondary product made in the manufacture of something else.

• 2 an unintended but inevitable secondary result.

In a chemical reaction there are reactants, products and by-products.

The reactants are air (oxygen and nitrogen) and fuel (hydrocarbons)

The products would be CO2 and H20 (as well as energy released due to exothermic reaction)

The by-products are unintended products which are the result of incomplete combustion/mixing/non-homogeneous mixture. These can be anything but usually CO, soot, unburned hydrocarbons (HC), NOx, etc etc all of which are undesirable and formed in minor quantities.

Thankyou and lesson over!!

Edited by R1minimagic, 07 April 2012 - 09:07 AM.

[The Matt]

As pointed out, a lot of "stainless steel" products are made from low-grade stainless. 304 does get quite shabby in a relatively short time on a car, but it'll still outlast mild steel in like-for-like conditions.

The whole point is, stainless steel exhausts are sold at a higher price as they are made from materials that are designed to last longer. In an ideal world a stainless steel exhaust will last a lifetime, these days with the cost of stainless steel ever increasing the extension in life over a mild steel variant isn't as high as it maybe would've been years ago. Speaking from own my personal experience, my stainless steel exhaust system is now around 8 years old and it's spotless. Mild steel exhausts these days last a few years, 3-5 probably. Yes, you get a slightly tinnier sound in a stainless exhaust sometimes, but the difference in sound isn't that much to worry about IMHO

[mini93]

Theres still companys out there, who, if you buy their exhausts will warrenty them for a lifetime, even the welds