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Knock sensors?
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lessdragprod(at)aol.com
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PostPosted: Tue Oct 16, 2007 3:51 pm    Post subject: Knock sensors? Reply with quote

I talked with one of the local pilots who was a flight engineer on the Connies. They not only operated the engine LOP, they increase the manifold pressure to recover the power lost by operating LOP.

As Don described it, the sequence went like this to set the cruise power mixture and power setting. (They used a power gauge.)

When they leveled out at cruise altitude, the power gauge showed a number with the initially rich mixture setting. They would calculate a reduced power setting by subtracting 10% or 15% (depending on the supercharger blower being in high or low blower) from the original power setting.
They would lean the mixture. As the mixture is leaned, the power gauge would show an increase in power, and then show a decrease in power.
When they got to the lower calculated power setting, they had the mixture set.
Now they increased the manifold pressure until they reached the original power setting.

Sounds simple. Just do this smoothly on four engines at the same time. Smile

For our normally aspirated engines, the capability of obtaining the power recovery isn't there.

I suspect the same power reduction and fuel fow reduction could be done running Best Economy and reducing the manifold pressure. Someone interested in doing a test program?

Regards,
Jim Ayers

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