Lambda
15-03-2007, 12:25 PM
#42
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Originally Posted by foreigneRS
SECS there are petrol engines that will run on an average mixture of lambda = 2 and have been for many years
just that they normally have a localised mixture at the spark plug closer to 1
just that they normally have a localised mixture at the spark plug closer to 1
Besides a Civic is the car in question not some nasty eco-friendly thing
thing
15-03-2007, 12:38 PM
#44
Testing the future
SECS it's just banter mate, but i think it's you who deserves the 
you know you're wrong and you're just can't accept it like a man so try to imply that i have done something wrong. i don't know where your animosity towards me comes from
you know you're wrong and you're just can't accept it like a man so try to imply that i have done something wrong. i don't know where your animosity towards me comes from
15-03-2007, 12:56 PM
#45
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Where am I wrong ?
Based on the original question, there was no mention of a cat or bad
running let alone mixtures inside the cylinder next to the spark plug.
Most cars lambda is measured after the engine and before the cat.
At that measurement point NO petrol car will run at lambda 2.0
As you have stated, only TRUE gas analysers can measure lambda post cat
and these are never seen in your local garage or tuning house - I agree.
Based on the original question, there was no mention of a cat or bad
running let alone mixtures inside the cylinder next to the spark plug.
Most cars lambda is measured after the engine and before the cat.
At that measurement point NO petrol car will run at lambda 2.0
As you have stated, only TRUE gas analysers can measure lambda post cat
and these are never seen in your local garage or tuning house - I agree.
15-03-2007, 01:36 PM
#46
Testing the future
Originally Posted by SECS
Where am I wrong ?
Originally Posted by SECS
Most cars lambda is measured after the engine and before the cat.
At that measurement point NO petrol car will run at lambda 2.0
At that measurement point NO petrol car will run at lambda 2.0
15-03-2007, 01:54 PM
#52
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15-03-2007, 01:55 PM
#53
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Originally Posted by AlexF
What do you think stratified injection achieves?
Lean burn....
Alex - off to look for proof
Lean burn....
Alex - off to look for proof
Alex,
I understand what you are saying there but lean burn cars dont run that
lean pre cat and produce useful working power no matter what dispersal
technology is implemented.
If I am wrong then my tuning book I have is wrong too
Nick,
STFU until proof is given
15-03-2007, 01:56 PM
#54
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Main injection takes place as the piston approaches top dead centre on the compression stroke, shortly before ignition. As seen in the above pictures, the concave-section piston concentrates more fuel around the spark plug, this allows successful ignition without misfire even when the air / fuel mixture is very lean. This explain why GDI can operate under fuel / air ratio of 1 : 40 under light load, which is even leaner than Lean Burn Engines. As a result, more complete burning is achieved.
http://www.autozine.org/technical_sc...ne/petrol1.htm
I could also get some quotes from some real books - but they are upstairs at my desk rather where I am currently sitting.
Alex
15-03-2007, 02:02 PM
#55
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If thats pre cat then I stand corrected 
Cant be that good as it isnt very widespread....
I will scan the page of the book I use for reference as it clearly is bollox.
Cant be that good as it isnt very widespread....
I will scan the page of the book I use for reference as it clearly is bollox.
15-03-2007, 02:11 PM
#56
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That would be pre cat beacuse its talking about the injection side of things....
The Cat requires difrerent technology to deal with GDi engines.
What book is it your reading? Could it be out of date?
Alex
The Cat requires difrerent technology to deal with GDi engines.
What book is it your reading? Could it be out of date?
Alex
15-03-2007, 02:20 PM
#57
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The book was written in 1988.
Its called Turbo and Supercharging written by Alan Allard.
So yes, it does pre date GDI.
I guess I cant be all knowledgable like Nick is
Its called Turbo and Supercharging written by Alan Allard.
So yes, it does pre date GDI.
I guess I cant be all knowledgable like Nick is
15-03-2007, 02:24 PM
#58
Testing the future
why do you have to have a dig at me? why not just accept that you are wrong with some grace?
i freely admit that you are far more knowledgeable than me on many things, as are many others (alex included). it's a fact of life and i am secure enough in mine to accept it
EDIT: ps, can i have my ladder back?
i freely admit that you are far more knowledgeable than me on many things, as are many others (alex included). it's a fact of life and i am secure enough in mine to accept it
EDIT: ps, can i have my ladder back?
15-03-2007, 02:54 PM
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Actually, thats not a bad idea, unfortunately, you will need to be invited
to join the site by the admin and pay a fee !
Anyway, I think its nearly done now - In my favour
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