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Ford Fair 2010 Report


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I'd like to know what the guys idea of 'lean' was.

 

well i have the print out that says it is air:fuel ratio (:1) -15.0 but he said it shud be -12.0 ish

 

does that mean anything to you guys??

 

Yeah, an AFR of 15:1 under load is lean. The chances are though he simply stuck a probe up the tailpipe which is far from accurate, so I wouldn't worry too much. That and the fact your engine probably misfire if running that lean under full throttle. Any exhaust leaks or whatever can throw off these tailpipe sensors.

 

12:1 is quite rich for a n/a car, but not one equipped with a catalytic converter (in which case i'd expect richer than 12:1).

Edited by Stu
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I'd like to know what the guys idea of 'lean' was.

 

well i have the print out that says it is air:fuel ratio (:1) -15.0 but he said it shud be -12.0 ish

 

does that mean anything to you guys??

 

Yeah, an AFR of 15:1 under load is lean. The chances are though he simply stuck a probe up the tailpipe which is far from accurate, so I wouldn't worry too much. That and the fact your engine probably misfire if running that lean under full throttle. Any exhaust leaks or whatever can throw off these tailpipe sensors.

 

12:1 is quite rich for a n/a car, but not one equipped with a catalytic converter (in which case i'd expect richer than 12:1).

 

 

yea it was a probe in the exhaust. my car has no cat on it and that 12:1 is pretty much constant throughout the rev range.

 

so are the results on my printouts not entirley accurate?

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I'd like to know what the guys idea of 'lean' was.

 

well i have the print out that says it is air:fuel ratio (:1) -15.0 but he said it shud be -12.0 ish

 

does that mean anything to you guys??

12:1 is plenty rich enough for a n/a car, my turbo'd escort runs 12's to mid 12s !

 

13:1 is normally good for a n/a engine, but without having it on a engine dyno you dont know where it is happy at as you cannot see what changes to the fuelling makes to the power

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  • 4 months later...

i had these pics from ford fair on my mums camera.

 

http://img.photobucket.com/albums/v496/dreadscort/SDC10645.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10641.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10640.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10639.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10637.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10636.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10634.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10633.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10631.jpg

http://img.photobucket.com/albums/v496/dreadscort/SDC10630.jpg

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