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Listeroid Engines / Re: that spring thing
« Last post by 38ac on Today at 01:46:47 AM »
The longest and softest spring that will give the required RPM without causing the engine to  hunt  will give the best governor action due to the fact it will have the most contact rate of pull over the length of movement. That is why too light a spring will cause the engine to hunt as Bruce said.  I have seen CS LIsters in Amish engine sheds that had screen door springs strecthed to a custom bracket. s
Sometimes the governor weight forks will have flat spots and thus not operate smoothly and will cause what you are experiencing.
There are several versions of 20/2 some are overbore and operating at 800 rpm some are standard bore running at 1000.  A standard bore engine operating at 800 rpm would be about 16HP while a big bore would be something over that. Either way you should be able to pull over 5kw
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Listeroid Engines / Re: that spring thing
« Last post by 32 coupe on Today at 01:27:14 AM »


It's an Ashwamegh 25/2 @ 1000 rpm.


The rack is open 20 to 25 % ( this just a guess) never the less, still plenty
of rack left.

It has 20 or so hours on it. I ran it with the junk 7.5kw head loaded with
4kw or so.

No black smoke.

I can rest my hand on the throttle linkage and bring it right to speed. 61/62 hz @  720 rpm.



Still thinking, even with the reduced rpms,  it should still pull 8 or 10 kw.

I will look for some springs in the next few days and see what I can come up with.


Thanks for your input.

Gary


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Engines / Re: Cracks in piston insert
« Last post by Mtour on Today at 12:56:25 AM »
Some better pictures...
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I also pull off the air filter for the spray bottle treatment. As Glort explained, that's not necessary, but i find it satisfying.  I do it while pumping up my 500 gallon air storage tank, usually after a pumping water and laundry. 
I do about a pint, as fast as I can hand spray the bottle.  The engine doesn't stumble at all.

I intend to do a proper water injection system on of these days. 



 

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Listeroid Engines / Re: that spring thing
« Last post by BruceM on Today at 12:33:36 AM »
Counterweights in the governor may also be an issue if they were downsized for much higher rpms than you are operating at. 

I'd certainly try a softer, longer spring.  My 6/1 is still running on a combo of two soft springs in parallel; best match I could find.  You know you've gone too soft when it hunts. 

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Changfa Engines / Re: Ability to import ChangFa engine to USA
« Last post by dieselgman on Today at 12:14:42 AM »
ANY engine imported into the USA requires EPA certification or exemption and at Port of Entry this can be problematic if you have not prepared all paperwork and jumped through all of their hoops. Very few exemptions remain now. I would not trust any seller who claims otherwise. We ship most of our heavy iron via ocean freight. Air-freight is crazy expensive to do.

dieselgman
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Listeroid Engines / Re: that spring thing
« Last post by dieselgman on Today at 12:03:20 AM »
Try it and see... sounds like you have covered the bases pretty well. You should not run out of power before maxing out that genhead. Of course, your engine will need some break-in time before developing its full horsepower potential.

Some thoughts... the 25 horsepower rating was provided by whom? And at what rpms? And how did they determine that horsepower? If you are running well under the rated speed then your power ratings will also have to be adjusted.

Any black smoke? What amount of fuel rack is being used under the max-load or overload condition? If the pump is not opening up, then look further into governor control... especially the linkages.

dieselgman
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Changfa Engines / Re: Ability to import ChangFa engine to USA
« Last post by 1868ccMGB on January 15, 2018, 11:53:13 PM »
Thanks for the help guys. I did find a supplier that ships the engine with the tank, muffler, air filter, and a few other parts separate from the crank case. Not sure if that classifies it as non-operational but the seller says no concern. I am trying to figure out how to ship this by boat, maybe it will cost less to ship.
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Listeroid Engines / that spring thing
« Last post by 32 coupe on January 15, 2018, 11:28:47 PM »
My 25/2 running about 720 rpms runs out of steam at 5k load.

I believe the governor spring is too heavy.

The linkages are free and easy to swing from stop to full throttle. No binding.
I added a spring or two to take all the slop out. Time was not a factor so time
was extended for proper set up.

Injector timimg, pretty much the same deal. I spent hours setting and adjusting
timing on valves and injectors.

Starts well, runs good.

With that said I am convinced the govenor spring must be on the heavy side.

Near a 5k load the engine is working harder and the hz will drop from 60/61 to 57/58
on the gen head. 11kw "stamford"clone, so I don't think thats the problem.

The rpms are dropping about 45.    720 to about 675 give or take.

The exhaust temps are within 4 degrees of each other under load.

Cooling temp leaving the heads near 190/200 with return at 160 or so.

I would think the beast should easily pull 8 or 10kw before it starts to
load up.

I say softer spring.   

What y'all think ?


Gary




 
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Waste Vegetable Oil / Re: How are you pre-heating your WVO before the injector
« Last post by tyssniffen on January 15, 2018, 08:58:19 PM »
I've been using a spray bottle, I wait till the engine is well heated and running at load, then spend a couple minutes spritzing the intake.  If I time it right, the intake pulse instantly atomizes the stream, and sucks it in. Otherwise, it dribbles in, and I always let the engine run a while afterwards to dry all the parts out, before shutting down.

cool. so you're pulling off the filter while it's running? 

I'm going to try this, AND work on changing my timing.
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