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General Category >> Technical Documents/Reference >> How Temp, Altitude & Humidity Impact Fuel Mix
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Message started by EssForty on 09/29/08 at 17:51:15

Title: How Temp, Altitude & Humidity Impact Fuel Mix
Post by EssForty on 09/29/08 at 17:51:15

Here is a handy table that explains how air temperature, altitude and humidity impact your fuel mix, and the proper corrective action to take (richen/lean) the mix.

http://1.bp.blogspot.com/_2NU0p82vl5Y/SOF0k3geXTI/AAAAAAAAAFo/CRS0Te_cb7U/s400/Capture.JPG

The logic behind this is that higher temperatures and higher altitudes make the air less dense, which means less oxygen and therefore a more fuel-rich mix.

So, to make a mix richer, change to a larger jet
To make a mix leaner, change to a smaller jet

To make your idle mix richer, turn the idle mixture screw CCW.

Title: Re: How Temp, Altitude & Humidity Impact Fuel
Post by EssForty on 09/30/08 at 01:50:59

The table represents relative conditions only. So, if your bike is dialed in at a range of 50-75% relative humidity and you move to a dry climate and it runs poorly, you know which way to go. Or if you live at Sea level and you're trying to suggest jet sizes to someone who lives in the Rockies you can understand how their local conditions will be different and which direction they should go.

To predict a optimal jet size for changing conditions you need a correction factor chart. These charts are created for a specific carb and normally provide temperature and altitude adjustments factors. Here is an example of what one looks like, but it is not for the stock carb on the Savage.

http://1.bp.blogspot.com/_2NU0p82vl5Y/SOHkWz3WpLI/AAAAAAAAAFw/qSL_yVV95DI/s400/Capture2.JPG

Title: Re: How Temp, Altitude & Humidity Impact Fuel
Post by Wolf on 05/31/09 at 13:51:06

NOW. (LANCER)... how does the Dial-a jet mod from Thunder Products work? Do you use the the graph as is and adjust accordingly? There was a tube that makes the carb acts like fuel injection too...

This mod (I assume) allows you to adjust 3 jet settings without switching jets. (once you have the correct jet selected).

Thanks

Wolf :D

Title: Re: How Temp, Altitude & Humidity Impact Fuel
Post by LANCER on 06/01/09 at 05:21:17

182023294F0 wrote:

NOW. (LANCER)... how does the Dial-a jet mod from Thunder Products work? Do you use the the graph (I do not) as is and adjust accordingly? There was a tube that makes the carb acts like fuel injection too...

This mod (I assume) allows you to adjust 3 jet settings without switching jets. (once you have the correct jet selected).
...{YES}

Thanks

Wolf :D

If you have not gone to the website and read this before then you should do so. It explains how the DAJ works much better than I ever could.

http://www.thunderproducts.com/dial_a_jet_techpaper.htm