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Messages - veggie

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General Discussion / Re: Hurricane
« on: September 28, 2022, 03:30:44 PM »
Good Luck 32Coupe, (and others)

Power may be disrupted for several days. Water is the big concern. High storm surge and much rain predicted.
This is why we prepare in advance.
Let us know how you make out.

Listeroid Engines / Re: Catalytic converter to reduce exhaust odor
« on: September 27, 2022, 07:12:55 PM »

Any update?
Also, have you considered running waste vegetable oil ? The fumes are not as offensive.

General Discussion / Re: Microcogen down.
« on: September 18, 2022, 07:01:52 PM »

This the warning I get when I visit the site now....

Listeroid Engines / Re: QUIET Exhaust - Listeroid - HOW?
« on: September 13, 2022, 03:10:58 AM »
I know old thread.. Veggie did you make it quiet?  Simpleset and easiest way is mount the exhaust outlet well above a persons ear height.  Maybe two good size mufflers then head the exhaust up side of house 7-10 ft. Works like a charm..  the reason big big generators do it this way.  Outlet above ear height makes a huge difference. No concrete or foam boxes just pipe and mufflers


Yes, it's super quiet. Have a look at the YTube video links above.
The project turned out very well.


Lister Market Place (things for Sale) / Re: CHANGFA stub Shaft
« on: September 04, 2022, 07:48:00 PM »
*** UPDATE ***

There are no more of these shafts available.

Changfa Engines / Re: New build - Changfa R175
« on: September 04, 2022, 07:40:58 PM »
"I can get A 4'' diameter round by  3/4'' or 1'' thick piece of steel. would have to lathe material out on backside deep enough for the flywheel nut. Then bore a 1'' hole . Then I could weld in a piece of 1'' diameter shaft stock with the keyway already cut in it.  Does that sond like an easier way to build a stub shaft?"

Keith71, yes that is exactly how my stub shafts were made (with help from a machinist).
Once the shaft is inserted into the flange plate with a press fit, weld the shaft to the plate on the inside AND the outside of the plate.
Then place in a lathe and skim any parts that are out-of-round due to welding.
If you want to end up with a shaft diameter of 1", perhaps make the raw unit using 1.25" shafting so there there is some material to skim in a lathe if there is a wobble.

Changfa Engines / Re: New build - Changfa R175
« on: August 30, 2022, 03:24:25 AM »
Hi keith71

The R175 engine has an internal gear pump and pressure lube system.
I tapped into the location where the metal oil screen used to reside.
Blocked it off, and diverted to the flow externally.

Regarding the little grey control box, it's a Scepter 4x4x4 inch conduit box from Home Depot / Lowes.
I wired in 3 circuits.
1] Push button starter switch
2] Double pole/double throw throttle actuator direction switch
3] Single pole toggle for coolant pump on/off

It was a bit tight fitting that into the 4x4 box as you can see in this picture....

<click picture to enlarge>

Engines / Re: Evaporative cooling question
« on: August 30, 2022, 03:15:32 AM »

Thanks for the feedback. I will see how I can fit a thermostat into the system.

Changfa Engines / New build - Changfa R175
« on: August 29, 2022, 08:33:21 PM »
New build almost finished.
A Changfa R175 coupled to a 4kw head.
(Max output is more like 2.5kw)

The unit has an external oil filter which added almost a liter to the oil capacity.
I suspect I can extend oil change intervals with this mod.
Also added is a throttle linear actuator which will allow future automation such as remote start/stop and throttle control.
You can see the actuator open the throttle just before the engine starts.
When the actuator is extended all the way to full stop, it sets the engine at 60hz speed. The max extension (60hz setting) is adjustable via a slotted mount at the back of the linear actuator

The small fuel tank is a temporary installation for testing purposes.
I only ran it for a few seconds because the cooling system has yet to be added.

Engines / Evaporative cooling question
« on: August 29, 2022, 08:25:27 PM »
On my latest project I was thinking of using and evaporative water tank for engine cooling. Just like the original Listers.
That project can be seen here ...

While they do take a long time to heat up, once near boiling they keep the engine at the optimal operating temperature.
And warm up time can be controlled by the size of the tank.
I will most likely use a pump for circulation rather than rely on thermosyphon, although that simplicity appeals to me also.
My question to all those who use an evaporation tank:...

Do you mix glycol to the water in your systems ?
And if so, does the glycol boil off with the water or does the mixture get slightly more concentrated as steam leaves the system?

Everything else / Re: Heat sand to 400F
« on: August 02, 2022, 07:04:52 PM »
Thanks mikenash,

"Certainly if you extended that pipe by a couple of metres and put fins all over it and ran it through a bathtub full of sand . . ."

I think if I could build a reliable, small, safe waste oil burner, I would not need the sand at all.
Just run the burner constantly along with some safety shutdowns which cut the fuel supply if needed.
I do agree that  an oil burner/heater is the most efficient way to heat with used oil.
Also needed would be a method of rapid/easy cleaning since waste oil leaves a lot of ash and crap in the burn pot.

Does the burner in that picture have a forced air supply or is it self-drafted?

Everything else / Re: Heat sand to 400F
« on: July 25, 2022, 06:57:34 PM »
"I`d be going for a thermal mass chimney system and smudge pot oil burner, but what do I know? Good luck and keep us informed. Bob"

Hi Bob,
The biggest issue I have with used oil heaters is that everything I have seen on youtube has been cobbled together with metal scraps. The units glow cherry red when running, and don't have any form of safety shutdown incorporated. They look fine as experiments, but running one in a garage every day (winters) in a residential area looks risky.
I would love to build a small (20K BTU) oil burner system if I could find a reliable and safe design to follow.
If anyone knows a good forum on this subject, or a good design example, please post it.

Everything else / Re: Heat sand to 400F
« on: July 25, 2022, 04:56:19 PM »

After modeling the idea, the numbers do not make sense for a micro system.


Specific Heat:
Water = 4182
Sand = 830
Sand holds only 20% of the BTU content capability of water for a given volume.

Raising a 50 gallon tank of water from 68f --> 180f requires ~46,725 BTU's
To store the same amount of heat in 50 gal of sand would require a temperature rise of approx. 900f

Heat transfer factor
Water = 13
Sand = 0.06
Roughly 200 times slower transfer rate in sand. (It holds heat very well ! )
But heating the sand bed would take a considerable amount of time.

So how do the new commercial sand heat storage systems get around these obstacles.
1] They heat the sand to 1800f or more by circulating molted nickel or molten salt through exchanger tubes in the sand bed.
2] With super high differential temperatures, they can rob heat from the bed at greater rates than my proposed 400f project.

For smaller heat reservoir systems water in king. It has the highest specific heat value and storage properties of any readily available media.

Everything else / Re: Heat sand to 400F
« on: July 25, 2022, 03:29:44 PM »
Hi Bob, thanks for the suggestions.
I have 20 gal and a 60 gal compressor air tanks.
They both have threaded connections added for heating elements.
Was planning to use the smaller one first.

Everything else / Re: Heat sand to 400F
« on: July 24, 2022, 03:58:22 PM »
I came across these heating strips which look interesting.
They are made by Wattco.
240 VAC
750 watts
Max. Temp of 1000F
Length = 23"

So 3 or 4 of these would use the 2250 to 3000 watts from a listeroid.

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