LOP with Fine Wire vs Massive Plugs

[carusoam]

Ross,

See if this explains it..?

1) One thing to account for during LOPs is the balance of the fuel ratios amongst all the cylinders...

2) A tight GAMI spread, is a sign that all cylinders essentially peak together.  There isn’t any excess fuel going unburned in any one cylinder...

3) A tight Gami spread allows for going deep LOP...

4) So... an engine that can run deep LOP is probably more efficient at peak, than one that throws excess fuel out the exhaust...

5) IOW... An engine that can run deep LOP is better at fuel savings than one that can’t... when run at Peak...

How is that?

Best regards,

-a-

[PT20J]

On 1/19/2020 at 3:29 PM, philiplane said:

Read the fine wire reports from RAM Aircraft. Documented fuel savings and performance increase with fine wire plugs because they enable deeper LOP ops. Fine wire plug electrodes are far more open than massive plugs. That's the difference. 

It might be helpful if you posted or linked to the RAM info you are referring to. I don’t see any reference to running deeply LOP with fine wires. The measured BSFC improvement was with a turbocharged engine at climb power at 100F ROP. 

RAM’s recommendations for LOP are very conservative - they only promise to honor a warranty if there is FAA-approved written documentation approving LOP operation for your airplane. They don’t recommend peak or LOP operation at all for twin Cessnas. 

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