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Discussion Boards > Active Subjects > Messages as Posted > Generators Forum

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08-21-2003, 08:50

Post: 62306

DRankin

Pics
Join Date: Jan 2000
Location: Northern Nevada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

Posts: 5105

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Power stability with PTO generators

Ken, I have been asking the same question here and to my self for several months. I think I found the key to understanding the dynamics in one of my tractor manuals.

If I have this wrong I hope someone will speak up and set me straight.

I was pondering the fact that my 4115 as a "low idle" setting (850 rpm) and a "high idle" which is listed at 2650 rpm.

That got me scratching my head until I realized that a diesel engine with no load is considered to be idling even when it is turning max RPM's. The governor adds more fuel when it senses a load, trying to maintain the rpm's as they are set with the throttle.

So a diesel engine with no load turning at PTO rpm burns way less fuel than the same engine, at the same speed, running a big load.

I think when you set the throttle on your pto/diesel/generator there is a minimum amount of fuel that will be injected/burned just turning all the parts.

When you start adding a load the governor compensates by increasing the fuel flow. If you add too big a load, the engine and governor maxes out and the excessive load will begin to drag the RPM's down, and a big overload will overheat the generator and/or stall the engine.

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08-21-2003, 12:54

Post: 62347

DRankin

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Location: Northern Nevada
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Power stability with PTO generators

Wadda guy! (both of you!) We should all be so gracious.

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