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Old 11-09-2017, 06:10 AM   #11
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Originally Posted by Bruceper View Post
An onan generator is a 4 stroke engine, which will respond decently well to exhaust modifications unlike two strokes.
The real reason an Onan is called a 4 stroke engine is that the average owner suffers four of them trying to get it to run reliably.
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Old 11-09-2017, 02:21 PM   #12
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"The real reason an Onan is called a 4 stroke engine is that the average owner suffers four of them trying to get it to run reliably."

Now that is funny!

Might as well laugh as we remove it for yet another repair. In fairness it is thought the ethanol fuel we now use has caused the most problems. Carburetor reliability was better on pure gasoline. Maybe it also has something to do with the fuel pump problems.
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Old 11-09-2017, 02:56 PM   #13
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The ethanol fuel is a big issue with them, for sure, but it didn't seem to be as a big a deal before they "emissioned" the carbs in the mid 2000s. Apparently, they did the normal changes which would limit the mixture on the rich end by reducing the fuel passage sizes in the carb, so they are perpetually right at the edge of going lean under the best of circumstances. Then you run fuel that needs to run a bit richer because of the alcohol in it, and is prone to gumming up tiny passages, no wonder you have problems. And of course, you make the carb sealed and non rebuildable on top of it all, so it can't be just cleaned out. It would be nice if someone had a CNC watercutter and made some gaskets for them so folks could clean them out rather than buy a complete new carb.

Another thing the Onan has that causes noise is that it is air cooled, which can really increase noise. Water jackets dampen a lot of noise, and the area around the engine can be insulated better because it requires less air to get to it. The Hondas do a remarkable job of keeping the air cooled generators quiet, as it is not an easy task.
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Old 11-09-2017, 04:43 PM   #14
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The best solution, proposed by Booster a while back, is a thermoelectric generator that burns propane (quiet) and produces 5-10 amps 24/7. I think the thermoelectric generators in satellites and Mars rovers use the thermocouple effect. We can skip the plutonium! Maybe the solid state Peltier effect would be the better technology. Anyhow, why don't one of you geniuses make me one?

Thermocouple power generation has an efficiency rating around 5% which makes it useful only when using waste heat but I still like the idea. It would probably go through a lot of propane.
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Old 11-12-2017, 08:37 AM   #15
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The Honda or Yamahas are by far the quietest out there but they are invertor generators and you will pay some big bucks per watt to power a well pump and fridge with them.
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Old 11-12-2017, 08:40 AM   #16
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I have an older Generac 5000 watt and it is absolutely the LOUDEST generator ever made!! It will wake the dead from across the state, it is so loud.

I am looking to replace it with a propane-powered generator, and would like an invertor generator so that the engine will vary according to load and reduce noise and increase efficiency. I have not yet found an invertor propane generator. Anybody??

I have been looking at the cheap Chinese propane generators branded by Champion. I have never heard one of them running to see how noisy they are. Anybody have any experience with those? They appear to have pretty good features and decent power output vs. fuel used.
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Old 11-12-2017, 09:00 AM   #17
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I heard several Champion generators running this year at the Reno air races RV area. They are a lot better in noise than your Generac and not quite as good as Honda. None were working on propane but I imagine you can convert them. I have a Honda EU1000i running on propane.

Don't know if you can stuff one into your Generac space or if they have remote start but I must have seen a half dozen of the Honda 3000i size Champions powering vendor tents to travel trailers. They must have some merit beyond price. At Oshkosh the worst were the Harbor Freight red 4000 watt (They aren't really) POS. Those things will get you killed. I wanted to put a bullet in the one near me.

On another forum it was asked how long the Honda 2000 would last. The answer was no one knew because no one had ever worn one out. Buy Honda and convert it to propane. Lifetime cost will probably be better than Champion. The 3000 can have electric start if that is what you want.
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Old 11-12-2017, 04:19 PM   #18
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The Honda or Yamahas are by far the quietest out there but they are invertor generators and you will pay some big bucks per watt to power a well pump and fridge with them.

The Subaru is even better.

But you do not see many of them around
because they are difficult to find.
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Old 11-13-2017, 03:59 AM   #19
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Somewhere I picked up the info that the engine in the latest Onan 2.8 is made by Subaru. Maybe they should just buy the inverter technology, too!
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Old 11-13-2017, 04:18 AM   #20
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