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Changfa Engines / Re: Changfa 1115 knocking
« on: November 30, 2023, 01:11:40 PM »
Anyone have any feedback for me on the use of antifreeze in the hopper of a changfa engine?
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Changfa Engines / Re: Changfa 1115 knocking
« on: September 19, 2023, 11:48:27 PM »
Well, if it uses a hopper cooling system which relies on evaporation and boiling of the water, I suggest temperatures of around 190f to 195f can be expected just below the hopper and around the cylinder head.
Mine is currently filled with green antifreeze. What impact will this have on the evaporative cooling? Is it worthwhile setting up a conventional radiator for cooling?
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Changfa Engines / Re: Changfa 1115 knocking
« on: September 03, 2023, 02:01:27 PM »
Thanks everyone for your feedback. Much more enjoyable tinkering with this thing when I know the rod isn’t going to fly out of the block. Next thing on the to-do list is to better understand this hopper cooling system. When using an infrared thermometer, what temps should I be seeing around the exterior of the cylinder head and cylinder?
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Changfa Engines / Re: Changfa 1115 knocking
« on: August 31, 2023, 01:59:38 PM »The pump is timed by the number of shims under it. More shims retards, less advances.
Am I correct in assuming that this timing is fixed through the entire operating range of the engine? Optimized for around 2000 rpm?
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Changfa Engines / Re: Changfa 1115 knocking
« on: August 31, 2023, 02:48:27 AM »Hi Gentles
Im with Butch. Direct injection. But you can take a look at injection point, it could be a bit earlier.
But with no load it sound ok at 1st glance.
Cheers
VP
How is the ignition timing adjusted and verified on these engines? Don’t see any mention of it in the manual.
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Changfa Engines / Re: Changfa 1115 knocking
« on: August 30, 2023, 06:27:53 PM »
Thanks for the feedback. Here is a video of it running around 1800 RPM. It should be noted that the fuel being used in these videos could potentially be quite old. I will be draining it and replacing with new later today.
https://youtu.be/r8AHbwl7Vzc?si=-X6_1j3BD2MjGpXM
https://youtu.be/r8AHbwl7Vzc?si=-X6_1j3BD2MjGpXM
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Changfa Engines / Re: Changfa 1115 knocking
« on: August 30, 2023, 12:32:56 AM »
The knock is definitely at its worst when at “start” rpm. Becomes quite loud as you increase the rpm and then quiets down a bit once the commanded rpm is reached. Very little knocking as the rpm is reduced until it “catches” at the lower rpm. Also fairly quiet when shutting down and doesn’t seem to knock while cranking with the decompression valve held.
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Changfa Engines / Changfa 1115 knocking
« on: August 29, 2023, 10:43:55 PM »
Hi everyone, new to the forum and excited to learn about these very unique engines. I just acquired a Changfa 1115 with an ST-12 head from an estate sale. Brought it home and surprisingly it fired right up. Being unsure of the grade and age of oil that was in it I drained it after running for about a minute. Replaced with straight 30 weight. Engine starts right up and seems to run fine aside from a terribly disconcerting knocking sound. I know these engines tend to be a little noisy but this sounds downright terrible. Loudest when operating at the “start” rpm but definitely still sounds terrible at the 1800 rpm operating speed. Anything I can do to confirm
If this is normal or not?
If this is normal or not?
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