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Old 03-03-2007, 09:05 AM   #11
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Lets explore the idea of the gennie being tied to the bus muffler.

Would it actually work with out causing damage to a diesel or gas bus engine? Meaning when the exhaust is piped into the exhaust tubing in front of the muffler, theoretically it would have to fill the entire exhaust pipe before going through the bus muffller, wouldnt it?

And if it does, what effect would it have on the bus engine's valving, exhaust manifold, etc? If any.

That would be an easy way to connect a large muffler to the gennie. Especially on mine, where it would be a straight shot after one 90* bend.
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Old 03-03-2007, 09:14 PM   #12
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I think that might work ok. You'd rarely, if ever, have both running at the same time. I would fear a little that the exhaust pulses from the big diesel might overpower the gas engine if they were both running at the same time, but I really don't know. That also might be an awful lot of backpressure for that little engine even when you weren't running the diesel engine. Buses have a lot of pipe! It might work better to tie in behind the muffler. I know you lose the muffling properties a little, but a long, big pipe would probably do wonders. It would also move the exhaust note out the back, far away from the passenger compartment. My only question is this....if it would work so well, why don't the manufacturers of stick and staple RV's do it?
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Old 03-03-2007, 09:37 PM   #13
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I suspect that some of the generator exhaust would come out the bus engine's air
intake. Piston engines have a phenomenon called valve overlap, where both the
intake valve and the exhaust valve are slightly open at the same time. It may not
happen every time the bus engine stops, but once is enough when it comes to
carbon monoxide finding its way inside.
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Old 03-03-2007, 09:39 PM   #14
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Yeah, I have no clue if tying it in would work. The mechanic who saw that install said that it was on a RE bus and the gennie was in the engine compartment (must have been a small one).
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Old 03-04-2007, 03:04 AM   #15
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But for those of us with a conventional, I think the threat of carbon monoxide coming in through the intake is far less than through an open window above the gennie's "normal" exhaust.
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Old 03-04-2007, 10:37 AM   #16
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No doubt. I just wanted to brag about my Internal Combustion Engine knowledge.
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Old 03-04-2007, 09:13 PM   #17
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here's my suggestion:

use your tax return, beg, borrow, steal the $$$ so you can afford to buy a honda eu series geni.

the eu2000 will run 15 hours at 1/4 load on a single gallon of fuel

it's incredibly quiet

and lightweight. Under 50 pounds

pure sin wave so you can run sensitive equipment

plus you can hook 2 of them together and double the output

if you don't have a geni yet, then you should definately buy the honda. you can get an el cheapo gas guzzling noisy geny for $500, or a honda for under $1K. The fuel you save alone makes the geni worth the investment.

I know I know...it takes all the fun out of trying to quiet a noisy geni. I can appreciate the project.

I don't care what muffler you put on your briggs motor, you cannot quiet the exhaust enough to come anywhere near the quiet eu series.

i did the math....

After about 500 hours you would be saving money with the honda verses the cheap geni.

475 hours the honda would burn about 32 gallons of gasoline @ $2.50 that equals

~$80 in fuel

475 hours for the briggs motor @ 0.5 gph (that's what mine uses) it would burn about 237 gallons of fuel equal to about

$593 in fuel.

total price to buy the honda and fuel = $1080

total price for the briggs motor and fuel = $1093

Certianly all things are not equal. the briggs geni does 220 volts, and 6K watts. The honda only has 110 volts and 2K watts. The equation also assumes the honda is only running about 1/4 load. I find it makes not much difference how much load i put on the briggs motor, it still gets about 2 hours per gallon of fuel. I did use my honda for most of 2 weeks straight i the middle of the desert running my jacuzzi, a small fridge, lots of lights, ect and averaged about 15 hours per gallon.

ok, i'll step off my soap box now....afterall, the original post didn't ask about quiet genie's...it was directed toward how to make a noisy geni quiet.
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Old 03-04-2007, 11:44 PM   #18
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Other Honda powered gennies, while slightly louder and slightly more thirsty, are good options as well. My bus has been powered for an entire weekend by an EN series. We ended up powering all the other campers around us with it because it was so quiet and 1 gennie running at full load is still cheaper than two running at half load in terms of fuel consumption. I think the 2500 watt EN can be had for about $700 though I haven't priced them recently.
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Old 03-05-2007, 12:06 AM   #19
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Gawd, I love my Honda EUs. One EU3000is for stationary/semi-stationary use and
one EU1000i for very portable use.

Expensive -- and worth it.
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Old 03-05-2007, 05:03 AM   #20
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if you are adventerous i've read about connecting eu's of different sizes ie: a 1000 watt and a 3000 watt geni together to make 4000 watts. The guy who made the post has connected multiple geni's of various sizes all at one time. Even cooler is that you don't need the fancy $150 honda connector to connect the geni's....an extention cord with a double male works just fine.
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