Lightning
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| posted on 13/11/04 at 09:22 PM |
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Lean or rich
If the engine has high HC with CO being OK is it lean or rich, or could it be either?.
Steve
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JoelP
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| posted on 13/11/04 at 09:24 PM |
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hc is hycrocarbons? if so, its unburnt fuel, which means too rich. CO should be high too though...
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andyps
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| posted on 13/11/04 at 09:46 PM |
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Is hc too high when it is burning oil? I know one of the tests is for this.
Andy
An expert is someone who knows more and more about less and less
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Lightning
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| posted on 13/11/04 at 10:38 PM |
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But if it was too lean there wouldn't be enough O2 so surley some of the fuel would still be unburnt???
Steve
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Mark Allanson
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| posted on 13/11/04 at 11:04 PM |
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If it is very lean, all the fuel is burnt, but you get o2 in the exhaust as there was insufficient fuel for all the o2 to be used up. The hc's
can increase as the combustion is hotter, the oil gets thinner and some is ejected on the exhaust stroke from the rings.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Lightning
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| posted on 14/11/04 at 08:24 AM |
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Cheers mark,
Was tired last night. I realised I spouted Bo***ks as soon as i woke up. Thanks for your help.
Steve
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sebastiaan
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| posted on 14/11/04 at 10:05 AM |
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Lean
Steve,
With marginal CO and high HC you're running lean. All the fuel doesn't get burned because the flame propagation (spelling?) speed is lower
with a lean mixture. Therefore the mixture is released into the exhaust before it had the chance to fully burn.
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jollygreengiant
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| posted on 14/11/04 at 02:12 PM |
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Depends on the definition of high HC's.
to make any objective reasoning values really need to qouted for
CO
HC
CO2
Lambda
also what engine/fueling
Enjoy. 69 Days & counting
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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MikeRJ
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| posted on 14/11/04 at 05:06 PM |
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High HC's and ok CO can also be caused by one or more cylinders misfiring, due to e.g. duff spark plug, sticking valve etc.
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Lightning
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| posted on 14/11/04 at 09:39 PM |
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Thanks Seb, That is exactly what I wanted to hear!
Steve
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Lightning
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| posted on 1/12/04 at 08:00 PM |
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You were right Seb. I blanked off some of the air box with gaffa tape and now it pulls sweet all up the rev range. I will now order bigger jets
124's and 126's as they only cost £1.50 each.
Steve
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wheelsinsteadofhooves
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| posted on 2/12/04 at 09:26 AM |
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not sure if this is any use as problem seems to be solved but for general interest...
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Lightning
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| posted on 18/12/04 at 08:28 PM |
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Chart was of help.
Changed jets to 126 today and boy, what a difference!!!!
Goes like brown stuff of a shovel
Steve
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