Hello, I bought an AURORA 6500 diesel generator in 2009. When I had the manual transfer switch installed in the house, the electrician told me to have my generator looked at. Well, I have had one disappointing experience after another !
I have read some of your articles and I feel my situation might finally have a tolerable end.
In order to achieve the 60hz, this generator just about shakes apart. The engine also sounds bad as it sounds as if missing at 3600 rpm. It wants to run seemingly well below 3400 rpm’s. I would appreciate any advice. Thank you
Answer: First, I attempt to answer your question and then I’ll ramble on some.. (as I normally do 🙂
I think some of these designs are pushed past their design limits to meet our 60hz standard with a two pole head. Gravity fuel systems might need to be set higher to deliver all the fuel required, and in stationary applications, the first thing we do is strip anything we can off the generator frame! The fuel tank can be full of bubbles, and as I mention way too low to keep your beast properly fed as such a high RPM. Gauges and other things… take them off the frame and mount them on the wall, keep them from rattling apart as many do.
Once you improve your fuel system, and you might add a lift pump. If the problem of not being able to maintain 60hz or near persists, then it’s time to look at your governor..
George’s Muse Follows..
First you need keep in mind, you solicit the opinion of a student, never to be the cocksure master we find in such numbers, and of course most of them have wares to sell.
When we deploy Diesels, we do so knowing the advantages, a fuel that stores for years when properly treated in a fuel system that doesn’t breathe. WE know of the fuel density, more BTUs per volume, and even our ability to manufacture a suitable alternative fuel if we desire.
Beyond that, we know that diesels CAN be built to produce torque at very low RPM, and many outlast their owners. At first direct drive between prime mover and generator head sounds like an advantage, but this doesn’t allow us to optimize our power plant for the loads >WE< typically run, which can greatly improve BTU/KWH conversions. Even a reduction of 200 RPMs can make all the difference in longevity, and it can improve fuel/KWH conversion figures in our typical operating range.
A gen set too large, is normally a bigger mistake than one too small, and the well pump generally the load that MUST be started.
A larger engine running a bit slower, and coupled via an efficient transmission allows us to use off the shelf common parts, and avoid expensive 8 pole heads and the like. And we run the engine well below that nerve racking speed that produces top HP rating.
It helps to visualize the game of more fully loading each power pulse, and still operating within the operating range of the governor, and sometimes we need make a spring change to a lighter one, if we are to get the best response to load coming and going.
Hands on experience is how we learn, and it is powerful as per changing our opinions. But what to do if you don’t like what you have? It really depends on how handy you are. Some find it best to sell what they have and start over. When you come across two bearing generators of decent quality, you have a major part of something you can build and tune to you liking… that’s if you’re a one percenter.. the other 99 percent shop the big box store..
Always the student..