TR6 PI NOTES

What No One Told You About PI:

There are a number of documents listing "how-to" convert a carbureted TR6 to PI. However, I haven't seen anyone document the problems associated with the system. Starting with the general problems and progressing to more technical issues:


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This photo shows the engine side of the metering unit, the full throttle screw can be seen on the bottom. The cold enrich screw is visible above and to the left of the full throttle screw. The lock nuts are exposed (black cover removed) in the upper left side of the metering unit. I have been able to adjust the cold enrich screw with a wrench but it's not easy!


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The full throttle screw with rubber hose cover canted to prevent rotation.


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The full throttle screw with rubber hose removed. The photo shows that two nuts are at the end of the screw, the inner one is the metric (?) locking screw and the outer is an SAE. Originally I envisioned using a wrench to adjust this, however, it is virtually impossible to accomplish when mounted on the car.



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This is the metering unit adjustment curve, the only data you really need. This basically tells you how to adjust the metering unit. I suggest modifying 4 items; locknuts A1, A2, A3 and full throttle adjusting screw.

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This shows the scale of the adjustment curves. Note the car idles at 10 inches Hg.