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Ford Fair 2010 Report

Ford Fair Show

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#91 Jordan99940

Jordan99940
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Posted 17 August 2010 - 08:56 PM

yeah means something to me i thinks fuel ratio should be 14.7:1 iirc so 15 aint fair off
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#92 nozaroc0

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Posted 18 August 2010 - 06:12 PM

the guy runnin the rollers told me it shud be about 12???
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#93 Jordan99940

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Posted 19 August 2010 - 12:12 PM

well im sure some one else will come up with the correct answer
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#94 Stu

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Posted 19 August 2010 - 12:21 PM

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, 19 August 2010 - 12:22 PM.

£500 for me to clear my inbox

#95 SteveB

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Posted 19 August 2010 - 12:23 PM

Deleted - answered by Stu!!!

Edited by SteveB, 19 August 2010 - 12:24 PM.

"If you can't fix it with a hammer, you must have an electrical fault"

#96 nozaroc0

nozaroc0
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Posted 19 August 2010 - 03:43 PM

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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#97 j1mbo

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Posted 19 August 2010 - 07:51 PM

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

#98 ST170 Dan

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Posted 22 December 2010 - 09:23 AM

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

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