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Old 07-05-2019, 03:33 PM   #41
hk4fvj
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I am: Al M
Join Date: Jun 2015
Location: Milton, On
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Re: Best Glow Plug OS AX 75: 7, 8, 10?


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Quote:
Originally Posted by Glow-man View Post
I bought two sleeve at Towerhobbies. At that time I could get just the sleeve for 75$US. For some reason they sell the sleeve and piston for the 75AX. If you still want that engine, just get it. I own 2 55AX, 2 95AX and one 120AX. I do not know exactly why the 95s started to give me problems, but I did all the tricks talked about above and it would dead stick on me, but seemed to run great on the ground and have compression. Actually now that I think about it. I would use OS 7 glow plugs. I still do on one of them. What it does is smooth the engine at low rpm. The AX family have a tendency to vibrate at low to middle rpm. Anyway what I noticed, is when I installed a new glow plug, I would get about 3 flights before starting to flame out. When it did flame out I could see the prop windmill. It would loose all compression. I was an expert at dead sticks. That summer I landed about 10 dead stick with my T 28 with bent fix gear at its worst. What I have notice is my engine would destroy my glow plug element. It was visible to the eye. That is when I really realized it had nothing to do with adjusting my carb, shimming the head or what ever trick I was told. It is possible I may have over heated my engine at one point before all this started because I did not properly air cool them. That was when I was trying to keep the cowl scale. However they did not show signs of failing till later. I know it sucks to put more money on what should last longer. In my case I love those engines. They run like a clock. When I go fly at the field I do not have time to fool around with stuff. It has to be start and go. I am a busy family man. Except for that event I just talked about. The OS AX family engines have gave reliable fun.
Oooyaaa! Next thing is after I changed the piston sleeves I always used the stock exhaust. Simply because perhaps using other types of after market brands might have cause my problems. I cannot say for sure. Below is an old video of my Spitfire with a new OS 95AX at the time with custom exhaust. Enjoy the story.
https://youtu.be/AdtwBGbmceQ
And this is how all this started. Dead sticks. The engine works OK on the workbench but dies airbone. Different plugs even OS#7 and the problem remains. Tried different fuels, nada. I have never seen the flame out but the problem is still annoying.
Nice video. Sorry for your plane.
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Old 07-28-2019, 12:06 PM   #42
hk4fvj
RCC Apprentice
 
I am: Al M
Join Date: Jun 2015
Location: Milton, On
Radio of choice:
Taranis
# of RCs: 20

Feedback: 0 / 0%
Posts: 65
Total Props: 0
Re: Best Glow Plug OS AX 75: 7, 8, 10?

Finally got one member of my club to look after. The guy reviewed the exhaust oil colour, he said it was OK as I am using castor/synthetic fuel at 15%.

Added a new OS 8 plug, the guy just barely rotated the idle needle, bingo. Now it is like new. I guess it is a matter of educating the hearing to understand exactly when the engine is fine or under stress.
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