Glow Engines Discuss RC glow engines

MVVS 120 boxer engine

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Old 06-14-2010, 04:26 PM
  #1
Sparkey
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Default MVVS 120 boxer engine

Has anyone information on the 120 boxer engine.
I beleive it was purchased about 7 years ago.

I can find petrol boxers but no nitro run MVVS 120 boxer or twin.0
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Old 06-14-2010, 05:13 PM
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Default RE: MVVS 120 boxer engine

I found this post where you asked about this engine 2 years ago...
http://www.rcuniverse.com/forum/m_75...tm.htm#7584165

Still having problems with it?

Here's more:
http://www.rcuniverse.com/forum/m_29...tm.htm#2962066

I still have mine...still sits in the box...waiting...(I didn't have much luck with it either )
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Old 06-14-2010, 10:16 PM
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Default RE: MVVS 120 boxer engine

Sparky,


Please stop using this foolish term...

It is not a 'nitro engine', but a glow engine, or a methanol engine...


This engine specifically was designed for 20/80 fuel, without any nitro at all.
All other engines here can use nitro, but only as an additive...


It is at most a minor component of the fuel...


And why do you think you must yell at us?!

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Old 06-15-2010, 12:46 AM
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Default RE: MVVS 120 boxer engine

I don,t know who you are but I guess you are the RCU police .Ha Ha

I thought we only had fools like you in Canada.

The bold letters were a mistake

However with dumb Trollers lioke your self what can I say. You obvisously have no freinds or hobbies other than trolling.
Oh by the way I have been modeling 60 years and still and always will call then nitro

Put that in your pipe and smoke
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Old 06-15-2010, 02:35 AM
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Default RE: MVVS 120 boxer engine

lol funny stuff by you both
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Old 06-15-2010, 06:57 AM
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Default RE: MVVS 120 boxer engine

I think Sparkey has no idea how to behave when writing in public. Maybe he is ignorant of forum rules in general as well.
FYI Sparkey: Dar provides better support on glow engines than most of us here. Those 60 years of you mean nothing if you do not know how to manage a simple twin.
Use 80/20 fuel, and fit a glow carb on her. The methanol probably has hardened the membranes inside the carby, so it will never run well.
Even with a membrane set, the walbro is not the best choice.
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Old 06-15-2010, 02:36 PM
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Default RE: MVVS 120 boxer engine

Hi!
The twin did not work properly! That's why MVVS discontiued the 20 and 23,4cc twins after some years.


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Old 06-15-2010, 04:19 PM
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Default RE: MVVS 120 boxer engine

Where did my post go!
I provided an answer how to make it work properly!!!
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Old 06-15-2010, 04:42 PM
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Default RE: MVVS 120 boxer engine


checking
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Old 06-15-2010, 04:48 PM
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Default RE: MVVS 120 boxer engine

pe reivers
One of my post were deleted also.

Could you repost the information on the 120 boxer.
Thanks
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Old 06-16-2010, 05:53 AM
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Default RE: MVVS 120 boxer engine

Methanol and Walbro membranes are not the best friends. The diaphragms harden, and carb performance goes down the drain.
I have tried running glow engines with a walbro carb, but found the throttle response on glow fuel very lacking.
Some people have had very good results by changing the Walbro carb to a glow carb.
Like Dar said in his post, use low nitro fuel. MVVS engines of that time were designed for zero nitro operation. I would suggest to use 2% max. If you want to run more nitro, the heads need to be shimmed to lower the compression ratio.
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Old 06-16-2010, 07:56 AM
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Default RE: MVVS 120 boxer engine

I thought large MVVS glow engines were to be run with no nitro? So don't call it a nitro engine.
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Old 06-16-2010, 09:34 AM
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Default RE: MVVS 120 boxer engine


Quote:
ORIGINAL: pe reivers

Where did my post go!
I provided an answer how to make it work properly!!!
Hello Pe,

Did it take a extreme amount of time and effort to get the engine to behave? There is a new 1.20 listed on RCU at the moment. I proabably shouldn't ask but what would be a fair price to pay for this engine?
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Old 06-16-2010, 10:09 AM
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Default RE: MVVS 120 boxer engine

Hi!
Sorry Pe! But I have tried a standard MVVS 7mm glow carb on the twin but it did not improve things!
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Old 06-16-2010, 05:20 PM
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Default RE: MVVS 120 boxer engine

Jan, I have had reports that said the engine did run well with a 10cc glow carb (8mm). At least as well as an opposed twin can run. Do not expect them to run as well as a single cylinder, especially in midrange. I have no experience with the engine myself, but did test the walbro carb on a 23cc single cylinder glow engine.

@ RCdude,
Indeed, you should not ask. Whatever it is worth to you. The engine is not produced any more.
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Old 06-16-2010, 06:03 PM
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Default RE: MVVS 120 boxer engine

Quote:
ORIGINAL: pe reivers


@ RCdude,
Indeed, you should not ask. Whatever it is worth to you. The engine is not produced any more.
Thanks Pe, I have no idea what to offer......

I have been pretty good at getting engines to run where others fail, but if this engine design is flawed to the point where it cannot be made to run well without serious machine work, then I guess its value will only be nothing more than that of a pretty paper weight.
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Old 06-17-2010, 06:18 PM
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Default RE: MVVS 120 boxer engine

Who said the design is flawed?
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Old 06-18-2010, 06:14 AM
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Default RE: MVVS 120 boxer engine

Quote:
ORIGINAL: pe reivers

Who said the design is flawed?
I believe Jaka did just that...
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Old 06-18-2010, 07:07 AM
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Default RE: MVVS 120 boxer engine

No, Jaka did not.
He said he had no luck with the glow carb. Others did have good results.
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Old 06-18-2010, 07:28 AM
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Default RE: MVVS 120 boxer engine

Okay, it must be my poor english then, but " The twin did not work properly! " does not translate into "a great design with minor carburator problems" to me...
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Old 06-18-2010, 12:29 PM
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Default RE: MVVS 120 boxer engine

Hi!
All MVVS twin engines I have seen and run myself have the same design flaws. They are impossible to set rich despite open the needle all there is...

However...they are very easy to start, and throttle fairly well as long as you use glow power.
As soon as you remove glow power and throttle down and run the engine at low rpm...and then apply full throttle...one of the cylinders will cut out! I have tried many many different glow plugs and also used the 7mm and 8mm glow carb...all in vain!

Another design flaw is that if you want to use silencers instead of mini pipes...one of the silencers will be in the way when you try to adjust the high speed needle.


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Old 06-18-2010, 01:43 PM
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Default RE: MVVS 120 boxer engine

Jan, you call it desigh flaws. I would not! Saito twin engines are/were also known for cylinders cutting out. So are Seidel radials. Design flaws or user ignorance? Sometimes all it take is using different plugs L/R. My OS15 4S also needed glow support near idle. Design flaw? Come on and give me a break!

After the take-over into private hands MVVS assembled these engines as long as parts were available. With all parts gone they stopped selling them because they were not part of their new ideology in which there was no room for niche market engines.
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Old 06-18-2010, 01:52 PM
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Default RE: MVVS 120 boxer engine

Hi!

Pe ! If not possible to reach the high speed needle when using silencers is not a design flaw ...tell me what isn't a design flaw!
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Old 06-18-2010, 02:28 PM
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Default RE: MVVS 120 boxer engine

rotate the cylinders so the carb is on top?
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Old 12-06-2011, 09:56 AM
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Default RE: MVVS 120 boxer engine

Ok, I'm new here.
Seems to be an old thread, maybe someone still monitors it?
I recently aquired a brand new MVVS 120 Twin, installed it in a Drastik 120.
A 16x6 two blade prop gives me about 8500 RPM.
A 14x7 three blade gives me about 10000 RPM.
I'm using OS no 8 glowplugs, 10% nitro, 20% oil.(50/50 castor&Klotz)

I have absolutely no complaints about the power, 1/2 throttle it climbs vertical.
On the 16x6.
I do however also get the low throttle cutout at idle.

I have designed and built a PIC circuit to maintain glow at low throttle settings(not installed yet),
and can live with that solution.

Main questions, am I in the ballpark with the prop, fuel, and glowplug setup?

Oh, some pictures...


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