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post #1 of 12 (permalink) Old 12-02-04, 06:33 AM Thread Starter
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Cool air affect on mixtures

Maybe someone knows this answer.

If your clevo goes a lot harder in cool nightime air, more than just the temp drop would normally give you, then is it a sign that the fuel mixture is a bit rich. ie compensates with cool air which is denser and runs relatively leaner and produces more power?

Does that make sense?


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post #2 of 12 (permalink) Old 12-02-04, 07:56 AM
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Re: Cool air affect on mixtures

As you've addressed, there are 2 issues at hand. Cold air is more dense and would normally require upsizing jets to keep your optimum AFR constant. So if you're saying that you're getting an extra ordinary hit on a cold night, then yes, you could say you are normally running too rich. The denser air is leaning your current AFR.

Did you get any AFR readings from any recent dyno's?

http://www.proficientperformance.com...conditions.htm

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post #3 of 12 (permalink) Old 12-02-04, 12:35 PM
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Re: Cool air affect on mixtures

Cooler denser air, more oxygen to burn, cyliner pressures increased, acts like a tiny dose of NOS
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post #4 of 12 (permalink) Old 12-02-04, 05:22 PM Thread Starter
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Re: Cool air affect on mixtures

Quote:
Originally Posted by TruBlu351
As you've addressed, there are 2 issues at hand. Cold air is more dense and would normally require upsizing jets to keep your optimum AFR constant. So if you're saying that you're getting an extra ordinary hit on a cold night, then yes, you could say you are normally running too rich. The denser air is leaning your current AFR.

Did you get any AFR readings from any recent dyno's?

http://www.proficientperformance.com...conditions.htm
Yeah thanks confirm what I thought. The extra ordinary hit seems that I am running too rich then for day time.

Fuel mixtures are all over the place as I'm swapping between BP100, Ultimate 98 and toluene depending on availability. All different densities requiring 1-3 jet changes on the extreme.

An on board exhaust gas analyser would be good, I'll try track one done.

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post #5 of 12 (permalink) Old 12-02-04, 05:48 PM
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Re: Cool air affect on mixtures

how much tolly do you add to a tank i can get plenty
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post #6 of 12 (permalink) Old 12-02-04, 06:30 PM Thread Starter
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Re: Cool air affect on mixtures

Quote:
Originally Posted by Sterpz
how much tolly do you add to a tank i can get plenty
About 15% works a treat.. Toluene is about 116 RON.

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post #7 of 12 (permalink) Old 12-02-04, 11:05 PM
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Re: Cool air affect on mixtures

I've almost got my on board AFR meter calibrated, so hopefully I'll have it all hooked up in a few weeks.

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post #8 of 12 (permalink) Old 12-03-04, 03:42 AM Thread Starter
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Re: Cool air affect on mixtures

Did some research today tracked down a US kit for a few hundred $.

I'm off to Asia soon so I might pick up something there..

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post #9 of 12 (permalink) Old 12-03-04, 09:02 AM
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Re: Cool air affect on mixtures

Quote:
Originally Posted by STROKEXD
Did some research today tracked down a US kit for a few hundred $.

I'm off to Asia soon so I might pick up something there..
Which kit are you looking at in the US?

Ideally, although they cost more, the perfect AFR meter uses a wideband O2 sensor. They read 0-5v instead of the normal 0-1v.

Yep, rice burna central should have all sorts of gizmos going cheap. You'll just have to fight thru all the fluro light bulbs and wood grain gear knobs first!

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post #10 of 12 (permalink) Old 12-04-04, 01:29 AM Thread Starter
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Re: Cool air affect on mixtures

Nordskog, here's the links:

http://www.nordskogperformance.net/p...alog/page5.htm
http://www.nordskogperformance.net/p...ding/page2.htm

I think the O2 sensor is only 0-1V for US$87, but by way of comparison the Auto Meter one which is a wide band I believe, Go Gear in Oz PArk quoted me $300+ ouch.

Found a great Speed Shop in Langkowi a duty free island last year, bought an Alpine CD/MP3 player for AUD$400. Same unit here over $1000 so fingers crossed they have some good gear.

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