MVVS 120 boxer engine
#1
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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
I beleive it was purchased about 7 years ago.
I can find petrol boxers but no nitro run MVVS 120 boxer or twin.0
#2
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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 )
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 )
#3
Senior Member
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?!
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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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
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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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.
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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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.
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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RE: MVVS 120 boxer engine
ORIGINAL: pe reivers
Where did my post go!
I provided an answer how to make it work properly!!!
Where did my post go!
I provided an answer how to make it work properly!!!
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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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.
@ RCdude,
Indeed, you should not ask. Whatever it is worth to you. The engine is not produced any more.
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RE: MVVS 120 boxer engine
ORIGINAL: pe reivers
@ RCdude,
Indeed, you should not ask. Whatever it is worth to you. The engine is not produced any more.
@ RCdude,
Indeed, you should not ask. Whatever it is worth to you. The engine is not produced any more.
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.
#20
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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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.
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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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.
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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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...
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...