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Messages - Tanman

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46
Everything else / Re: Lead acid battery bank confusion
« on: January 07, 2022, 06:15:46 AM »
Okay, so I returned my bank. They weren’t really happy about it, but processed it lol. I also recently discovered that a local auto place sells lithium ion ev car batteries that have been removed from crashed cars. They are selling a Prius Prime 8.8kwh pack for around $1450! (I can go pick it up with my truck) The vehicle only had 12,000 miles on it! This seems like the way to go.

47
Everything else / Re: Lead acid battery bank confusion
« on: January 02, 2022, 01:16:25 AM »
I don’t mind the Segway, interesting things all the way around. My bank is still under warranty, so I’m just going to return it. I hardly used it and it’s having serious trouble holding a charge. I’m going to go find larger amp hour deep cycle batteries instead of these.

48
Everything else / Re: Lead acid battery bank confusion
« on: December 20, 2021, 05:14:59 PM »
I tested all the cells with a hydrometer, they all are pretty much the same at around 2.25v per cell. There were no very low or high cells. So I’m guessing my charge controllers (2 inexpensive 30a mppt charge controllers) do not have the proper settings to get the bank fully charged. And unfortunately they are not adjustable. My plan is to ditch these for a higher quality unit and see how that goes. The factory set float charge on the controllers I have is 27.5v

49
Everything else / Lead acid battery bank confusion
« on: December 16, 2021, 06:57:17 PM »
Hello, last year I built a 24v battery bank that consists of twelve 6v golf cart batteries. I have them in three strings of 4 batteries each. The problem I'm having is, the volts get pretty high pretty fast with a very low rate of charge (maybe 200 watts total). But it won't hold at this higher voltage. It will climb to 29 volts or so with only a few amps being applied. Also, the battery voltage seems to drop farily quickly with only small loads. Any idea why the batteries don't seem to have the umph they should have? They seem weak to me? Or are my charge controllers not doing their job?

50
Changfa Engines / Re: Changfa looking engine - ebay
« on: December 05, 2021, 09:55:20 PM »
The description says “ Diesel engine Faryman 433Type, mdl. 43F435 15HP(Used)”

51
Changfa Engines / Changfa looking engine - ebay
« on: December 05, 2021, 09:54:40 PM »
Saw this on eBay, looked interesting. $485+165 shipping.

52
Listeroid Engines / Re: Stuck valve guide
« on: December 05, 2021, 02:17:36 AM »
Got it out with more heat and force, no threads but it was  as a bugger!

53
Listeroid Engines / Stuck valve guide
« on: December 04, 2021, 06:54:21 PM »
Well I tried to get a valve guide out of the head, one came easily ish. The other won’t budge. The metal seems soft and somewhat brittle because it has crumbled where I was hitting it with the hammer and socket I was using. I’m trying to heat it and tap more but it doesn’t want to go. Any tips?

54
This is a dumb question, but what does that switch on most st-type generators do?

55
Changfa Engines / Re: How many Changfa's do you want ?
« on: December 01, 2021, 09:08:02 PM »

Tanman,

Those things are monsters!
Make sure that there are no women or children nearby when you first start it.
The fear that is instilled by the engine noise causes them to break into tears and later causes nightmares  :o
[/quote]

I started it last night with a battery, cracked right of in about 30 degrees F. Seems to be put together a little better than the laidong 1115 I had a while back (purely subjective observation).

It is a beast

56
Changfa Engines / Re: How many Changfa's do you want ?
« on: December 01, 2021, 09:04:41 PM »
I just picked up a changchai 1100 with an st10 today for $550! Now I just have to figure out what to do with it!

Where ?

Minneapolis/St. Paul area

57
Listeroid Engines / Re: Twin...SLOW SLOW speed....?
« on: December 01, 2021, 07:49:52 PM »
Slowing a 12/2 down to 500 RPM makes it a 10/2. Using the 2HP to 1 KW rule of thumb you would have a 80% loading at 4KW, which is ideal IMO.
If you decide to remove one rod and piston be sure to have a camera set up and share video the first time you start it!! 😆

Lol, well that answers that question.

58
Listeroid Engines / Re: Twin...SLOW SLOW speed....?
« on: December 01, 2021, 06:45:14 AM »
I have a similar question to this, I have a 12/2. But really only need 4kw of power out of it at any given time. I'm assuming there would be less fuel consumption and wear If I built it to run continuously at (guessing) 450rpm ish? My other idea was to remove the second piston, rod, and pushrods and run it as a single at the regular 650rpm.

59
Changfa Engines / Re: How many Changfa's do you want ?
« on: December 01, 2021, 04:23:33 AM »
I just picked up a changchai 1100 with an st10 today for $550! Now I just have to figure out what to do with it!

60
Listeroid Engines / Re: Flywheel energy
« on: October 07, 2021, 12:30:38 AM »
Well folks, I partially agree with you....and partially don't.  An inductive load will certainly benefit from a larger generator head.  Specifically "in the start".  As in "locked rotor amperage".  I oversize my 12/1 with a 20 kw ST head, where I originally had a 12 kw ST head (still oversized for the engine, I know, I know).  The results were immediate.  I was better able to start an inductive load, and keep the voltage vs current phases closer together (thus power).  I could witness it on the oscilloscope. 

Once the inductive load is up to speed, the current requirements totally change.  Infeed power loads on a "starting" inductive motor are MUCH larger than the "run" requirements.  And if you oversize your generator head, GIVEN the mass of the flywheels (approximately 50 instantaneous horsepower, by two each, 150 pound flywheels turning at about 1000 rpm, IIRC), you DO gain benefit.  I've proved it. 

Now, please notice that I never said you could constantly tax your 6/1 or my 12/1 at a constant demand as dictated by that 15kw head.  Obviously, that would never work.  Should you attempt, you'd find that your engine would lug down pretty quickly, and suffer the consequences of low frequency.

I think this is what the guy in the video was trying to achieve, he said it was for starting and running a bore drill. I would assume the “correct” generator head would not start the drill, but using the oversized one with some extra flywheel power was enough to get it started and the 6/1 could keep it running once started.

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