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More Speed in a TB20

It was the fuel flow gauge giving inaccurate readings mainly, which in turn meant it was difficult to lean the engine properly, according to the POH power tables. Using the factory fitted fuel flow system meant you over leaned the engine.

When the new CGR-30P engine analyser was fitted it made a big difference, as you can now lean the engine using Manifold Pressure, RPM, but also EGT’s and Fuel Flow far more accurately. The end result was that the aircraft flew at the correct speeds according to the POH, which is what I had been trying to achieve. The new Fuel Flow Transducer was fitted forward of the firewall and not where the factory fitted (below Fuel Cock in the belly) can be found.

One interesting thing that the engine analyser showed, that you would never pick up on the old factory fitted analogue gauge, is that the Prop was overspeeding by 5 to 10 RPM on take off.

EGLK, United Kingdom

Colin wrote:

One interesting thing that the engine analyser showed, that you would never pick up on the old factory fitted analogue gauge, is that the Prop was overspeeding by 5 to 10 RPM on take off.

I wouldn’t be trying to adjust anything for that tiny discrepancy, it’s surely such a small difference it makes no difference to anything

Darley Moor, Gamston (UK)

This might be relevant.

Administrator
Shoreham EGKA, United Kingdom
23 Posts
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