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UMS Evolution Radial Care and Operation

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UMS Evolution Radial Care and Operation

Old 04-14-2016, 04:11 PM
  #1776  
Ozflyboi
 
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Hi Maxam,

Yes thanks for your advice I have two other biela props 17x8 and 17x12 to try with this motor.

I went over the valve adjustment last night and will run the motor this evening to check the RPM with tacho.

I am still running 90/10 methanol/synthetic cool power blue mix. Not using nitro as I really want to avoid risking rust/corrosion having heard the reports of this on the 735 from posts on this thread.

If I am not satisfied with the performance I will give further consideration to converting to petrol using morris mini motor upgrade kit.
Old 04-15-2016, 05:24 AM
  #1777  
Maxam
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OZ you will find these engines run really well with some nitro. It is the methanol that causes the corrosion due to its hygroscopic nature. They MUST be flushed out with air tool oil at the end of the flying session.

SLSKN I was referring to OZ on props. I am confident you know what you are doing! I am going to maiden my Pietenpol today! eeeeek!
Old 04-15-2016, 06:00 AM
  #1778  
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Maxim thank you for your reply after I posted that I realize you were talking about someone else. Sorry, well good luck on your maiden flight, hope everything goes well, very nice looking airplane, just wondering if anybody knows if Nitro goes bad I have a half a gallon from last year when I was making my own fuel just not sure if Nitro goes bad after a period of time.
Old 04-15-2016, 07:55 AM
  #1779  
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How do you draw fuel and prime the carb on in cowl installs? closing the throttle fully works or putting the finger on the exhaust ring with throttle fully opened?
Old 04-15-2016, 01:15 PM
  #1780  
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I'm having a bear of a time with mine, maybe someone can help. I bought it used (yeah, I know) and so far the only way I can get it started is to richen the crap out of the low-end. Like four or five turns out. Obviously it runs super rich and leaves a mess behind. It won't even pop at the factory setting of two turns. I'm running specially blended fuel (7% oil, 7% nitro).

I can get the high end pretty set fairly well, but the low end seems like it's all over the place. It pulsates and won't idle at all without glow power.

I checked every plug and they all work fine.

Any thoughts?

Last edited by Sessholvlaru; 04-15-2016 at 01:19 PM.
Old 04-15-2016, 05:57 PM
  #1781  
BobH
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A lot of people have the same issues with rich running etc. If you look back a few pages you'll see the suggestion about installing an OS carb on the engine.
That is supposed to fix the, not so good carb, issue.
Old 04-15-2016, 06:47 PM
  #1782  
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Hi all Im new to the forum I just ordered my first round engine!I bought the evo 7-77 Im shure Ill have fun with it don't have an airframe yet probably something ww1 or golden age era definatly got the message about the after run oil what glow driver do you guys recomend?thanks tug
Old 04-15-2016, 07:14 PM
  #1783  
TimD.
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Originally Posted by Tugsorus
Hi all Im new to the forum I just ordered my first round engine!I bought the evo 7-77 Im shure Ill have fun with it don't have an airframe yet probably something ww1 or golden age era definatly got the message about the after run oil what glow driver do you guys recomend?thanks tug
McDaniels/ sonictronics
Old 04-15-2016, 08:25 PM
  #1784  
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Sonictronics is an excellent system. Just be aware it's positive earth/ground.

Sessholvlaru, try changing all the O rings on the carb ,needles and on the carb body to.
Old 04-15-2016, 08:57 PM
  #1785  
chorner
 
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Originally Posted by Sessholvlaru
I'm having a bear of a time with mine, maybe someone can help. I bought it used (yeah, I know) and so far the only way I can get it started is to richen the crap out of the low-end. Like four or five turns out. Obviously it runs super rich and leaves a mess behind. It won't even pop at the factory setting of two turns. I'm running specially blended fuel (7% oil, 7% nitro).

I can get the high end pretty set fairly well, but the low end seems like it's all over the place. It pulsates and won't idle at all without glow power.

I checked every plug and they all work fine.

Any thoughts?
As mentioned previously, check your carb. Might need a re-build. The stock carb is *bad*, but not THAT bad. If the high-end at least holds steady and you get decent RPM's then it seems like the engine itself and the valves are set OK I would think.
Old 04-15-2016, 09:26 PM
  #1786  
Sessholvlaru
 
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I'll pull my carb off and take a look. The previous owner flew it for two seasons so I know that it ran well before. Maybe from sitting something got gunked up.
Old 04-15-2016, 11:30 PM
  #1787  
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Hello Ozflyboi.
In the Netherlands we use Klotz synthetic oil. This oil contents aditives to avoid rust, Itt is THE OIL for glow engines. Maybe you can buy it in the US but that, I don´t know.

Regards,
Timo Montagne
the Netherlands
Old 04-16-2016, 10:21 AM
  #1788  
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Originally Posted by Fulcrum2111
Hello I got an evolution 7 35cc engine to fit a high wing aircraft with a wingspan of 80'' and a weight of 14lb and would like to know if should I:
1) keep it stock and use a large battery externally to start the engine (lower weight)
2)convert to cdi and run methanol (less fuel consumption, more power)
3)convert to gas (cheaper, no rust?)
I know there are several conversion kits for this engine to run gas or cdi ignition. I want to hand start the engine, is it possible with a external battery or do I need a spark plug? what are the advantages of eac h alternative?are the cdi conversions actually reliable? your comments and experiences are appreciated. I also want to know if converted to cdi what economy in fuel would I have and if I would get less oil residue on the aircraft.
The most important aspects for me are the no oily mess and the easy hand starting what should I do?
Hello Fulcrum
I am new with radials but what do you mean with nr. 2 Convert to cdi and run methanol...... You use Sparks instead of glowplugs?
Regards,
Timo
the Netherlands
Old 04-18-2016, 11:45 AM
  #1789  
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Hey guys Im going to get a collecteor ring for my little7-77 is the Keklo better than the factory one or is the factory one satisfactory? also ordered the mcdaniels driver with the scale glow plug caps.thanks tug
Old 04-19-2016, 05:21 AM
  #1790  
Maxam
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Keleo is much better and does not leak.
Sess, sounds like you have a leak somewhere in the intake system. Check the intake nuts for tightness. -Tom
Old 04-19-2016, 05:30 AM
  #1791  
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Originally Posted by Maxam
Keleo is much better and does not leak.
Sess, sounds like you have a leak somewhere in the intake system. Check the intake nuts for tightness. -Tom
I'm sending mine in to Horizon. Where are the intake nuts?
Old 04-19-2016, 04:09 PM
  #1792  
Maxam
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The ones on both ends of the intake pipes (from crankcase to cylinder)
Old 04-19-2016, 06:35 PM
  #1793  
Tugsorus
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Well my little 7-77 arrived today what a little jewel!got a mcdaniels driver on order hopefully soon I can lite it off !
Old 04-20-2016, 01:18 AM
  #1794  
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Hello all.
I also have ordered my first Evo7-77. After i read the threads i came to the conclusion that the Evo radials are good engines. I only have one question left about the power. Whai is the max. lbs it can pull?
Regards,
Timo
the Netherlands
Old 04-20-2016, 04:40 AM
  #1795  
Maxam
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WOW! Two new 777's. Have fun with them guys. I think a 777 can pull a 28 pound warbird or a 45 pound pietenpol. The lighter the airframe the lower the throttle setting. These engines are not meant to be floored all the time. Preferable 25 pound warbird and a 17 pound aerobatic plane and a 30 pound stearman.
Old 04-20-2016, 05:19 AM
  #1796  
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Originally Posted by slskn
.....just wondering if anybody knows if Nitro goes bad ...........
Not in the sense of goes "bad". If you kept it sealed up well then it should be fine. I have burned 20 year old fuel cans that were well sealed but I did mix it with fresh to insure quality.

Remember that we are dealing with alcohol and nitro, both of which are VERY prone to evaporation. On a gallon of premix, if the ethanol or nitro manages to evaporate off over a period of time then you would, of course, consider that bottle "bad" because the percentage of oil/nitro/ethanol would be changed.
Sometimes this can be seen in a translucent gallon jug as a (unwanted) change in liquid level.

The up-side? The oil doesnt evaporate off, it will still be there so at least you wont HURT your engine.

I have noticed some of my newer gallon jugs that bleed out of their (bottom) seams while I have it stored on the shelf. Very disconcerting.
Old 04-20-2016, 08:09 AM
  #1797  
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I have a 13.5kg plane and it goes like a train..


Last edited by cymaz; 04-20-2016 at 08:13 AM.
Old 04-20-2016, 10:38 AM
  #1798  
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Hello Tom
The pounds you say, is that included the engine?
Old 04-20-2016, 02:12 PM
  #1799  
Maxam
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Yes sir.
Old 04-20-2016, 08:08 PM
  #1800  
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It's been a long time since I converted my 7-77 to gas and ign (Adrian at CH provided the parts), and finally got round to flying the plane.

It's mounted on a giant Aeromaster and weighs about 25-26 lbs.which is about 8 lbs lighter than my friends A/master with a Sachs 3.2

Did the maiden flight today. Prop is a 22/12 turning about 5500. Running 20:1 mix and has had not much in the way of running so still just a hair on the rich side, but not very much oil spewing out...most of it comes from the lube that comes off the rockers.

I can't believe how quiet this engine is in the air. Plane flew very well, not the powerhouse I thought it might be, but certainly adequate for the kind of flying I do. Most of the flight(s) were below 1/2 throttle.

It was a bit of a struggle to get everything in the plane, ignition box, tank, fuel pump etc, and to balance the plane I mounted 3-2500 lifes just in front of the vertical fin. I will try to get some photos this weekend...weather permitting.

I have to contact Adrian as I acquired a 7-260, new and un-run for a VERY low price. Ser. # 0002 I am missing the harness that goes from the ignition box to the battery switch. It is a 4 pin harness and Horizon can't supply one without the ignition..$1,000.00 US!

I'll see if Adrian can help me out.

Cheers,
Dave.

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