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Larry Larry is offline
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First recorded activity by BoatBanter: Jul 2006
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Default Soundproofing/Waterproofing a Honda Genny

"dene" wrote in news:1169276883.977097.126110
@l53g2000cwa.googlegroups.com:

Again....don't hesitate to be critical and/or creative.



Bye bye, little Honda (snif)!

The HOT AIR coming out of the COOLING SYSTEM is heating the INSIDE of the
Coleman cooler and being sucked back INTO the cooling system! That slot
in the top isn't near enough cooling to keep it from destroying the
engine. It's breathing its own hot cooling air!!

NO, no no no NO!....

What you SHOULD have done was cut a hole and put in a piece of internal
ductwork the same size as the WHOLE hot air outlet around the exhaust,
that whole grillework where the hot air comes out around the muffler
inside the gen's case. On the OTHER end of the cooler, you should have
opened a hole to let outside air INTO the cooler, sucked in by the vacuum
the air blowing out the cooling air exhaust causes, which will fill the
cooler with COOL air, NOT its own hot cooling air. The intake should
have a little rain cover pointing down and open all along the bottom.

The slot in the top is totally unnecessary if you use the cooling I
describe, so no "cover" to keep the rain out will be necessary. Drill
some holes in the bottom of the cooler, say 3/4", so any water that
stands in the bottom of the cooler will simply drain out under it.

Air comes in one end....right by the controls and expensive electronic
inverter electronics keeping them COOL. Hot air and exhaust comes out
the OTHER end, forced out of the case by an internal ductwork that
prevents it recirculating inside the cooler and causing the electronics
and engine to overheat.

I have both the EU1000i little 1KW suitcase and the MUCH BETTER designed
EU3000i 3KW genset. The 1KW runs way too fast for longevity, as does
your 2KW. The EU3000i only turns its 6.5hp engine 1200 RPM up to about a
1800 watt load. I ran my stepvan shop off the 1KW for a year and it
started to show signs, hard starting, etc. I stumbled into the EU3000i
in the Honda dealer parking lot. They guy was bringing it back for the
7KW RV model for his 5th wheel camper. Instead of trading it in for
$1200 from the Honda ripoff artists, I got it for $1500 cash with about 8
hours of use in the original box. He'd had it 3 days and it wouldn't
pull his two RV AC units....(c; The EU3000i is mounted on the outside of
the left rear swing door on a couple of really heavy 1000# right angle
brackets, permanently bolted to them. Welded to the outer end of the
brackets are two hinges whos floppy side is welded to a welded steel
framework that supports my unpainted aluminum cover, to keep the 3KW out
of the rain. Two Stanley self-locking gate latches hold the cover to the
door when it's closed, one on each side. Open these latches and the
whole cover swings back away from the generator and down, exposing it
completely for service and fueling. The entire bottom of the "box" is
simply left open. The EU3000i air intake is STUPIDLY located in the
steel channels on the BOTTOM of it so if you lay it on the ground it will
suck up anything into the case and engine. Cooling air for the 3KW
inverter comes in through cooling slots under the control panel. A full-
width slot in the port side of the top has an overhanging rain shield and
is close to the hot air/exhaust outlet on the opposite side from the
control panel. Venturi effect of the air rushing out the genset through
this slot actually pulls a vacuum on the whole case, causing me to have
to clean the road dust out of it quite often as it runs all day all
summer pulling the 2 AC units cooling my stepvan shop/office. Costs
about $8/day at $2.50/gal for 10 hours continuous duty. I fill it every
other day all summer. It holds 3.5 gallons on top of the genny, easily
filled directly from the hose at any gas station by simply flipping down
my aluminum cover.

The inside of the aluminum cover is covered with packing foam to reduce
the already quiet sounds to a whisper. Most noise comes from vibration
transmitted to the door from the mounting brackets. It's a price I pay
to keep the van at 75F, not 105F all summer...not an option in SC.

In winter, I heat the truck with the 1KW little genset INSIDE! I welded
a pipe nipple to that tiny exhaust outlet on the EU1000i muffler. A
right angle flange copper tubing adapter directs the exhaust into a coil
of 1/2" copper tubing that's about a foot in diameter and a foot thick
with the coils pulled apart to form a naturally-aspirated heat exchanger.
The genset's cooling air outlet is pointed forward into the cabin of the
van from just inside the back doors. The copper tubing open end is
routed through a hole in the deck out under the van. By that point, the
exhaust temperature is barely warm, resulting in near 100% heat recovery
from the genset to heat the truck. Guesstimates show around 35000 Btu at
low speed Econo setting. It also powers the shop without having to drive
the air conditioning, of course. There's little electrical load and I
recover near 100% of my fuel investment making the truck toasty warm at
the expense of having to listen to the genset inside the truck. Moving
down the highway, this isn't much of an issue and the truck, itself, is
noisy. I'm sitting almost on top of a 6.2L diesel V-8 under a fiberglass
lid. It's a truck, not an SUV, you know...(c; Coming in out of 25F
freezing rain into a heated truck at 80F, dry and warm is worth the
noise...(c; A 115VAC-operated carbon monoxide alarm, running off the
genset's AC outlet, makes sure there are no leaks gassing the truck
interior when either of these gensets are in operation, especially my
"truck heater".

I recently installed a remote starting kit in the 3KW electric-start
genset. It replaces the manual choke with a solenoid unit like outboard
motors have and remotes the keyswitch up into the shop. I used to reach
up into the bottom of the cover to start it, and damned near got bit by a
Brown Recluse, the world's most poisonous spider, that had built her nest
in there. Their poison continues to eat flesh long after the spider is
squashed. Nasty stuff.

Larry
--
Democracy is when two wolves and a sheep vote on who's for dinner.
Liberty is when the sheep has his own gun.