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Hi there,

There are adjusting screws to make the machine run leaner. On the picture the number 1/2. Left around leaner. Right around richer. This allows you to set up the machine individually with the Co Tester Very easily.

 Ralf

 

Ralf

Einstellschrauben.JPG

Edited by Schnippel
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6 hours ago, Schnippel said:

Hi there,

There are adjusting screws to make the machine run leaner. On the picture the number 1/2. Left around leaner. Right around richer. This allows you to set up the machine individually with the Co Tester Very easily.

 Ralf

 

Ralf

Einstellschrauben.JPG

Hi Ralf,

That's true, but a pretty big over-simplification! 2 and 3 (and the one you haven't labeled) are simply locking rings. 5 adjusts the minimum fuel stop. 4 adjusts how far the mixture leans out for cruise, and affects the min fuel stop. 1 affects at what vacuum the mixture starts to lean out going from WOT to cruise, and affects how far the mixture leans out for cruise, and affects the min fuel stop.

Not shown is the max fuel stop, or the datum track which affects how much the mixture changes with vacuum.

If you don't have the appropriate calibration rig, or a wide-band AFR sensor and a lot of patience, don't kid yourself you can tweak the PI system! Just send it to a professional. And no, I'm not one. But I do have a calibration rig and an AFR sensor, but not enough patience...

John

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29 minutes ago, JohnC said:

Hi Ralf,

That's true, but a pretty big over-simplification! 2 and 3 (and the one you haven't labeled) are simply locking rings. 5 adjusts the minimum fuel stop. 4 adjusts how far the mixture leans out for cruise, and affects the min fuel stop. 1 affects at what vacuum the mixture starts to lean out going from WOT to cruise, and affects how far the mixture leans out for cruise, and affects the min fuel stop.

Not shown is the max fuel stop, or the datum track which affects how much the mixture changes with vacuum.

If you don't have the appropriate calibration rig, or a wide-band AFR sensor and a lot of patience, don't kid yourself you can tweak the PI system! Just send it to a professional. And no, I'm not one. But I do have a calibration rig and an AFR sensor, but not enough patience...

John

Hi John, a PI MU expert (can`t remember who), once told me which screw to adjust, to stop backfiring on the "overrun" ie from a WOT to idle and indeed which way ie C/W or AC/W to reduce it? Can you enlighten me again please?

Colin.  

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21 hours ago, c.hydes said:

Hi John, a PI MU expert (can`t remember who), once told me which screw to adjust, to stop backfiring on the "overrun" ie from a WOT to idle and indeed which way ie C/W or AC/W to reduce it? Can you enlighten me again please?

Colin.  

Kind of. If there's one screw then it's A3 - the smallest one. Clockwise to richen the mixture; a turn is quite significant. I'd start with half a turn and see how you go. Try to minimise the final adjustment as much as you can. Too much and you'll affect idle. Much too much and you'll mess up cruise as well.

John

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2 hours ago, JohnC said:

Kind of. If there's one screw then it's A3 - the smallest one. Clockwise to richen the mixture; a turn is quite significant. I'd start with half a turn and see how you go. Try to minimise the final adjustment as much as you can. Too much and you'll affect idle. Much too much and you'll mess up cruise as well.

John

Cheers John.

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