andy's bosch fuel injection manuals wrote:stoichiometric mixture
Within narrow limits,a fixed quantity (that is, weight) of air contains a certain specific numberof oxygen molecules,and any given weight of any specific gasoline like wise contains some definite number of hydrocarbon molecules. Because the burning process amounts to individual atoms combining with each other, it follows that there is only one particular ratio of gasoline to-air that can ensure that all of the oxygen molecules mate up with all of the hydrocarbon
molecules. This theoretical ideal is called a stoichiometric mixture.
If there is an excess of oxygen molecules,some of them will fail to find partners. In
terms of the number of oxygen-hydrocarbon pairings, and thus the amount of energy
released, the effect is as if we had started with a smaller quantity of air. At the same
time, if there are too many hydrocarbon molecules in relation to the amount of air,
then some of the hydrocarbons will emerge from the combustion process unburned.
Some of the gasoline is simply wasted. Not only that, but a shortage of oxygen means
that there is a likelihood of some of the carbon atoms in the hydrocarbon fuel to combine
with just one oxygen atom, rather than two, yielding carbon monoxide (CO) rather
than carbon dioxide (CO2)' While CO2 is one of the" greenhouse gasses" that are partly responsible for global warming, at least i is only immediately harmful to animal life
when its concentration grows so large that it displaces much of the oxygen we need to
breathe. CO, on the other hand, is toxic even in small doses.
It turns out that about 14.7 lbs. of air contains the correct number of oxygen molecules
to pair up with the number of hydrocarbon molecules in 1 lb. of gasoline.
FAQ - 406 D8 petrol (excl. V6) running and starting problemsPeugeot wrote:what are you worried about? we made car that lasted 10 years"..."Zat is very goode non?
vladman wrote:umm, so what's the general consensus here guys, the leaks in my exhaust CAN or CAN'T be causing the failed emissions test? i need to have this sorted one way or another by the end of next week, 'cause my car's now untaxed, and i can't tax it without the MOT!
Welton wrote:You said the leaks in the exhaust were in the middle/back of the car, I know this and I know that this WILL NOT affect the Lambda reading, however the others still say it will
If I were you:
Fix parking brake
Hot run + Optimax + Injector Cleaner
Welton wrote:That told me then..............
Actually I was kind of barking up the wrong tree, I was thinking about the Lambda sensor being affected by Oxygen drawn into the exhaust and affecting the fueling, when really it was the case of what was being read at your tail pipe that was the issue, Sorry.
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