UK Karting - Notice Board (2-Stroke Karting) : Re: jet sizes etc.

Notice Board (2-Stroke Karting)

Re: jet sizes etc.
Posted by 'rotaxjettingcom' on 26 Oct 2012 @ 14:58

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rotaxjettingcomJoined: October 2006
Total Posts: 5
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Firstly, in your scenario if you were going up from a 152 then onwards to say a 158 and had a jet that was marked 158 but was in fact a 152 or something, then that would be pretty obvious when you used it – the engine would run even leaner when you expected it to run richer from your original setting. In which case you’d probably throw out the ‘bad’ 158 jet and replace it. All you need is a set that are linear in their range. So your 154 is bigger than your 152 and smaller than your 156 etc.

The software has a unique calibration facility that enables you to fine-tune the software to correctly match your own engine/carburettor/exhaust combination. If you do this using a ‘standard’ set of jets (ie. your own set), then as long as you use the same set, the software will have been calibrated to match them and the calculations that the software then makes, will produce the corresponding size jet (from your own set) etc required to maintain the correct fuel/air ratio. In that way, the number on the jet just becomes a means of identification.

The ‘problem’ of mass-produced carburettors and components with their inherent tolerance is one of the reasons why the software was produced in the first place – hence the unique calibration facility. If you don’t take that into account, you can never achieve acceptable accuracy. There are a number of things within the software that we don’t reveal for commercial reasons but we do guarantee the accuracy to within 0.299%.

Message Thread:

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Re: Rotax 12.5 carb for minimax . Which floats by 'newminidriver' (24 Oct 2012 @ 20:48)

Re: Rotax 12.5 carb for minimax . Which floats by 'Ditch' (24 Oct 2012 @ 21:09)

5.2's & 30/30's for sure BUT by 'ScoobyScene' (25 Oct 2012 @ 8:11)

Re: Rotax 12.5 carb for minimax . Which floats by 'rotaxjettingcom' (25 Oct 2012 @ 15:01)

Re: Rotax 12.5 carb for minimax . Which floats by 'newminidriver' (25 Oct 2012 @ 23:25)

Re: Rotax 12.5 carb for minimax . Which floats by 'PoppaAl' (26 Oct 2012 @ 8:17)

Re: jet sizes etc. by 'rotaxjettingcom' (26 Oct 2012 @ 9:25)

Re: jet sizes etc. by 'davidmc' (26 Oct 2012 @ 11:41)

Measure them silly ;-) by 'ScoobyScene' (26 Oct 2012 @ 11:56)

Re: jet sizes etc. by 'rotaxjettingcom' << You are here!

Colin - Jet size gauge? by 'rjbcar27' (26 Oct 2012 @ 13:25)

Re: Colin - Jet size gauge? by 'rotaxjettingcom' (26 Oct 2012 @ 15:16)

Re: Colin - Jet size gauge? by 'PoppaAl' (26 Oct 2012 @ 17:56)

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