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Messages - veggie

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Changfa Engines / Re: Do it Changfa Style
« on: May 19, 2019, 03:56:08 PM »

They really are amazing engines.
A few years ago I built a really nice Changfa 195 Generator which my neighbour bought from me.
Since then he has added only 2 hours of run time. He offered to sell it back to me for 25% less than he paid.
The problem is that I already have 4 in the garage. Hmmmm.... how could I hide this one if I bought it ?
Maybe if I painted it the same colour as my others she won't notice it ?  ::)

Changfa Engines / Re: Do it Changfa Style
« on: May 19, 2019, 03:51:48 PM »

These people are just painful to watch.
I'll bet a new set of rings and a valve lap would save them a lot of accumulated time and farting about trying to start that thing.
I'll also bet they just let it run till there is no more fuel and therefore have to bleed it every time which shouldn't be that hard on these things.

... also note the engine does not have an air filter. In that dusty environment it's like having sandpaper in the cylinder bore.

Here's a passenger view of a work vehicle ...

Changfa Engines / Do it Changfa Style
« on: May 07, 2019, 10:59:00 PM »

Everything else / Re: Solar water heaters.
« on: April 10, 2019, 02:23:03 PM »
I just skipped back to the future and went to 120VDC.  My computer and rear projection workstation are running on it now, with stock power supplies.  This is handy in the US as many small kitchen appliances, as well as soldering irons, work nicely on 120VDC.

BruceM, that's very interesting.

Using 120 vdc really reduces wire size in a big way.
120 vdc would work very well when applied to a 120 volt water heating element.
(Although switching on/off 120 vdc with any substantial amperage may be tricky)

1] Is your 120 vdc derived from a battery bank? or are you pulling 120 volts from a solar array?
If it's an array, how are you regulating the voltage as the array output varies?

2] How do you run your computer on 120vdc?


Everything else / Re: Solar water heaters.
« on: April 09, 2019, 02:38:24 PM »

Here's an example of an application in Calgary, Canada which provides winter home heating.
Notice the steep angle of the panels to capture winter heat as efficiently as possible.

Everything else / Re: Solar water heaters.
« on: April 09, 2019, 02:27:26 PM »

I was reading about a guy in Canada recently who linked to a vid on PV panel angle.
Due to the odd occasion when it snows and everything gets about a 1M buildup, some Canadians have found tilting their panels 90o, Straight up and down has worked well for them. 

The tilting of of the panels to a vertical position (90 degree from horizontal) is to capture the low winter sun.
Here in Canada (Especially northern Canada) the sun does not rise much above the horizon through the day.
Some orient part of their array vertically and part of it angled upwards. Others build a winter/summer angle adjustment into the array framework.
The rule of thumb here is to angle the panels at the same value as your location latitude +5 degrees.
So if you live at 55 degrees north, then angle the panels at 60 degrees for the best year round performance.
There are many application of evacuated tube solar water heating systems here.
They work very well in winter.

Everything else / Re: High Volt/ Amp DC Switching hacks.
« on: March 08, 2019, 07:15:14 PM »
Better test that 12V auto starter relay very carefully; gods only knows how well it will work on 300VDC or whatever your PV string voltage is.

My Solar array is 24-36 volts depending on load, and my heating element is a 600 watt, 24 Volt unit with the impedance matched to the array output sweetspot.
Max amps is around 27. I don't see any fire risk with the solenoid being this underloaded. And it is a dedicated DC switch.
The application would be different for everyone but for switching of <100 amps at 12 to 24 volts these units have proven themselves for decades.

They are standard equipment on wind turbine and solar array Load Diversion modules.

Everything else / Re: High Volt/ Amp DC Switching hacks.
« on: March 07, 2019, 11:14:38 PM »
Reviving an old thread here but I came across this idea for switching DC power to water tank heating elements.
For applications where you have 12 or 24 volt panels feeding a DC element in a hot water tank, perhaps these 100 Amp continuous duty DC solenoids would work.

The low amperage trigger circuit of the solenoid could be wired in series with a N/C temperature snap switch which disconnects the power when the tank reaches it's set point.
The heavy load terminals carry the high amperage solar panel current directly to the heating element such as this one..

If you search ebay with this description you will find many sellers of these DC rated solenoids:
Solenoid Relay Switch Continuous Duty fit for Golf Carts 12V SAS-4201 SAS-4202

Original Lister Cs Engines / Re: Exhaust joints
« on: March 01, 2019, 03:02:09 PM »

I used  the stretchy Silicone exhaust tape on my Listeroid exhaust joints and it works great to close off any tiny leaks.
The problem is at the first joint in my system is only 1 ft. from the cylinder head.
That joint reaches 500f under heavy load and it cooks the silicone.
Turns it from Red to Brown and starts to curl and peal off.

So be aware that the silicone tape has limits. Otherwise it's great stuff.



That is a VERY good price for that engine. !


Changfa Engines / Re: Laidong and alternative fuels
« on: February 09, 2019, 11:07:30 PM »
+1 what Glort said.

The Chinese 1115 engine is a beast and very reliable.
They lend themselves very well to alternative fuels like chip oil because of the Indirect Injection heads.
The injectors have a bigger injection port (one single hole usually), like a Listeroid.
If cared for, the 1115 will probably outlive the average human. Parts can still be found with relative ease.


Changfa Engines / Re: jiang dong R108d flange/pulley
« on: February 06, 2019, 04:16:20 PM »
Does this size and bolt pattern fit your engine?
I have 2 for sale.
You can mount a standard pulley of any size to get the correct drive speeds.


Look here... in our "for sale" section

Listeroid Engines / Re: Testing import exception
« on: January 31, 2019, 08:38:08 PM »

That's a lot of work just to get an engine.
They have to approve your test objectives.
Unlikely you will ever get an approval.


Changfa Engines / Re: Why have they fell out of favor??
« on: January 26, 2019, 02:31:48 AM »
Now the men at that nostalgic  stage and tinkering with stuff are far and few between. The last  few generations being raised in town by single Mothers has wiped out whole generations of future mechanical hobbiests , fisherman, hunters etc.

Yep. Not only that but the ones who do work on equipment have become "replacement artists".
Don't repair or rebuild it ... just replace it.
To some extent you can't blame them because the replacement parts can be very inexpensive vs the time and effort to remanufacture your own. But having the skill to machine, repair, modify, and problem solve is a very useful skill.

Those 195's are indestructible !
if anyone is looking for a super reliable beast of an engine, then you should get one of these before the guy stops importing them.
They typically run at 1800 - 2000 rpm when driving generators but man they are loud.
Women and children usually start crying an run away in shear terror.

But they last forever.

I took one of these and slowed it down to 900 rpm after making a few modifications.
At that speed it was much quieter and could still make over 3Kw of generator power.
I basically I turned it into something like a Listeroid CS6.  Slow speed and 3Kw.
My neighbour fell in love with it and bought it off me.
Every now and then I hear the chug...chug...chug of the unit when he runs it.

if interested, here's a video of it before I sold it.


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