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UMS Radial Engines

Old 08-27-2021, 12:31 PM
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n8622t
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Default UMS Radial Engines

I started with an Evolution 7-160 and have enjoyed the performance which led me to continue with the improved UMS radials. Fortunately Adrain at CH-Ignitions is a distributor and fully capable with the repair and replacement parts for these engines. I recently had an ignition problem in a new engine and Adrian supplied me with the new upgraded version ignition which fixed the problem. I am running several of the UMS radials and so far they are mechanically sound. I started this thread for anyone that may have questions regarding these engines…troubleshooting is always better with more than one head in the game so feel free to participate with any and all comments anyone may have


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Chris Nicastro (08-28-2021)
Old 08-27-2021, 02:13 PM
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Good idea on this thread. I'll be working with the new 150cc 5 cylinder due to be released soon. I have worked with the 7 cylinder 77 glow engine and it was pretty nice but its glow fuel and were switching over to gas on our projects. Looking forward to more first hand info. Mods might move this thread over to the engines section BTW.
Old 08-28-2021, 01:11 AM
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Glad you joined Chris… I just finished the 5-180 install on my N-28 and have only ran it in the ground so far. Lots of power
Old 08-28-2021, 01:13 AM
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The 5-180 I have found to be thirsty for prime on start up, so you might be aware when you first start your 150. Post some pics when you get it😀
Old 08-28-2021, 01:20 AM
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Here is my previous install, 5-125 on a TopRcModels FW 190. It’s also a thirsty starter
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Old 08-28-2021, 05:57 PM
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first run on the 5-180cc with a pump
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Old 08-28-2021, 05:59 PM
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First run on 5-125cc with a pump
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Old 08-28-2021, 08:13 PM
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That’s basically the same set up my friend and I are doing on the TRC FW-190 with the 150. Do you think the pump is necessary from your experience?
Old 08-29-2021, 05:44 AM
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Originally Posted by Chris Nicastro View Post
That’s basically the same set up my friend and I are doing on the TRC FW-190 with the 150. Do you think the pump is necessary from your experience?
my first two engines were evolution 7-160cc engines and I ran both without pumps. In order to run the engines without pumps, I had to set both needles a full turn or more out beyond the factory settings to run without being lean. One of the two evolution 7-160cc had a mechanical failure after 5 years of use, something wrong with the cams. I replaced that engine with the UMS 7-160 and added a pump. With the pump installed, both needles were set a bit leaner from factory settings. Then I mounted the 5-125 without a pump on the FW190 and found that I couldn’t get the needles out far enough to get the engine to run rich, so I added the pump and it fixed the problem. The tank on the 190 is close to the carb , within 4”.
I’m running a pump on all of them including the newly installed 5-180. The pumps help in a tremendous way
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Old 08-29-2021, 06:40 AM
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UMS 7-160 with pump and new upgraded ignition
Old 08-29-2021, 06:42 AM
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Old 08-29-2021, 06:47 AM
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Pump set up



Old 08-31-2021, 06:38 PM
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I am considering the UMS 260 five cylinder for a new project, so greatly appreciate the info you are providing on the UMS line of radial engines.
Old 09-01-2021, 01:06 PM
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Looks like I’ll be ordering the 5-180 for our FW-190 project. I’m pretty excited because this will be a nice combo and the sound will be outstanding. The 5-150 sold out I guess and that’s fine the 180 is more flexible for future builds anyway.
Old 09-01-2021, 02:36 PM
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Originally Posted by Chris Nicastro View Post
Do you think the pump is necessary from your experience?
I have a few of their engines and do recommend a pump to be used. Do not use the pump it comes with.
Old 09-01-2021, 07:42 PM
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Originally Posted by n8622t View Post
https://youtu.be/3xLlMxqMtQg
first run on the 5-180cc with a pump
Can you confirm the maximum diameter of the 5-180 engine? Since you have the Top RC FW can you tell me if the 5-180 can fit the cowl?
Old 09-02-2021, 02:12 PM
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Originally Posted by Chris Nicastro View Post
Can you confirm the maximum diameter of the 5-180 engine? Since you have the Top RC FW can you tell me if the 5-180 can fit the cowl?
unfortunately it won’t fit…I started out the same way and had to go to the 5-125 and it’s too big as well
Old 09-02-2021, 04:32 PM
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Originally Posted by n8622t View Post
unfortunately it won’t fit…I started out the same way and had to go to the 5-125 and it’s too big as well
OK so just to be clear the diameter they specify on the factory drawing is not correct? The 180 won't physically fit in the cowl?
Did you have to modify the cowl to fit the 125?

I know were slightly off topic but the diameters of the engines being misrepresented is important.

EDIT; I see now the drawing has two diameters and the larger one is basically 11 inches OD

Last edited by Chris Nicastro; 09-02-2021 at 10:11 PM.
Old 09-02-2021, 05:10 PM
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Here’s the chart


5-180 Dimensions

Last edited by Chris Nicastro; 09-02-2021 at 10:05 PM.
Old 09-02-2021, 10:09 PM
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The new 5-150


Old 09-02-2021, 10:10 PM
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I think it’s interesting the new 150 is smaller in diameter than the 125
Old 09-04-2021, 03:22 AM
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If you have any doubt about the literature, call Adrian at CH-Ignitions. He is the rep and can definitely get you on track. The 5-125 and 5-180 won’t fit the TopRcModels FW190 but it would be nice to see the 150 fit
Old 09-05-2021, 05:40 AM
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Originally Posted by Chris Nicastro View Post
I think it’s interesting the new 150 is smaller in diameter than the 125
look at that 5-100cc. It’s just over 9 inches in diameter which will be an easy fit for a 10 inch cowl
Old 09-06-2021, 11:32 AM
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I ordered the 5-150 so we’re going to find out soon!
Old 09-06-2021, 11:58 AM
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Originally Posted by Chris Nicastro View Post
I ordered the 5-150 so we’re going to find out soon!
post some pics😀

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