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 Post Posted: Wed Oct 17, 2012 4:10 pm 
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Joined: Sat Feb 07, 2009 4:12 pm
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Location: Adelaide Australia
Consider it this way. Imagine a box it could be the cylinder or the manifold, whatever, its just a box.
The density is the number of molecules contained in a box. When you count the number of molecules inside the box you know how much it weighs and then you know how much weight of fuel to add to the box.
The pressure inside the box is due to how many collisions per second the molecules make with the walls of the box. Its called temperature. It got nothing to do with the number of molecules in the box and therefor nothing to do with the number of fuel molecules.

The engine needs to be tuned to the number of molecules in the cylinder(density), the carby delivers fuel based upon the pressure differential from outside the engine to inside the manifold (baro).


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 Post Posted: Wed Oct 17, 2012 4:16 pm 
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What Im saying is DA is useless to me. DA or relative altitude can give you the same number with totally different baro's, so how can that be of use?
Its just like reading Widebands, you have to introduce other aspects to be more accurate. Tuners need to learn what it is that their engine reacts to, not just follow a number on a screen.


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