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Old 04-17-2015, 09:54 PM
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GP 123 Vs MVVS 116 NP

Guys! No brand war / Just a brother to brother suggestion

Got this EF 104"! Got a frozen brain between two of the following:-

1. GP 123 Or the MVVS 116 NP???

2. If GP 123 then with regular compact mufflers Or headers+cans

Because in case of MVVS 116 NP, they say its useless to run it with compact mufflers. Even company do no make it/supply it and compact mufflers are supplied by other vendors.

Hope the CG balances well if we go for the number 1. Because its a heavy weight champ
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Old 04-18-2015, 01:17 AM
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Mvvs supplies compact mufflers.
Www. Mvvs.cz
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Old 04-18-2015, 03:52 AM
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Quote:
Originally Posted by TimBle View Post
Mvvs supplies compact mufflers.
Www. Mvvs.cz
Their representative informed over call that they do not produce it nor keep it in stock however available from other sources
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Old 04-18-2015, 04:54 AM
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I had the chance of a 116 np and headers and cans for my extra 111". Worked out it was going to be roughly four lb's heavier than EME 120 on stock mufflers.

Though I know the MVVS is a far superior motor in quality and power I went the light option. Even if I have to pipe the EME later for more power it still will be a couple lb, s lighter than the MVVS cannister setup and balance easier.

If I had needed the nose weight it would have been MVVS all the way.

I know you are asking about 123 GP versus 116 np but I'm sure weight and balance will be a factor in your decision to, it seems the ef 104 balances well with a light motor which may rule out the mvvs.
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Old 04-18-2015, 06:00 AM
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Originally Posted by Haisan View Post
Their representative informed over call that they do not produce it nor keep it in stock however available from other sources
Whose representative?
Mvvs produces the side dump 3210. It's under the 116IRS. I think your representative means that they do not stock the exhausts. But there is an extensive range of exhaust available from MVVS and sold through many if its dealers

http://www.mvvs.cz/mvvs_116_e.html


Of the two engines I would be inclined to opt for the MVVS despite its great weight. The GP is an awesome engine but the MVVS seems to be built to survive a world war. I am very impressed with my 58PS compared to my Gp61. Since the 116 and 123 use the jugs of the half capacity engines I would the running and tuning ease of these engines to be transferred to their bigger brothers although crank case breathing plays a bigger role in the twins.


It's an enviable position to be in to have to chose between these two engines.
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Old 04-20-2015, 01:00 PM
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I flew mine this weekend only 3 liters fuel through it on mvvs pipes ripping a 30x10 mejlik on demand it's on my ef 110 yak at 30lbs and it's more than enough have get idle below 900 so it will land a lot more power than my gp123 on pro rc pipes both engines have their place but my favorite is the mvvs
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Old 10-15-2019, 01:32 AM
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Hi,
Can someone please tell me which carburetor is installed (model number) in mvvs np116 so I can have a carb rebuild kit
Thanks
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Old 10-15-2019, 02:03 AM
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What? Lower? OK!
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Walbro WB-27-1
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Old 10-15-2019, 06:33 AM
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MVVS for some reason is the only model engine manufacturer I have seen with a full circle, “stuffed” crank. That gives it a higher crankcase compression which explains a lot.
However, they are basically non existent here in the USA.
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Old 10-15-2019, 07:56 AM
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Only because for some reason no one wants to sell them or no one can get a dealership?They need to have a good exhaust to get the full potential out of them.On a side dump exhaust they are just another 2 stroke engine.I think they are the only real high performance engine around.Morris Hobby years ago sold them but there was mix feelings between them and MVVS.Canada had a dealer at one time, I bought a 45 and a 58cc from him,but he is gone now too.When I was running the 58 pro sport on a pipe,I got 7500 on a NX 24-8 and that prop has more load then a Falcon 24-9.
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Old 10-15-2019, 11:20 AM
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Actually there has been a scattering of dealers over the years but none last any amount of time. Also there were the rebadged engines sold by Horizon. Some of the Horizon sold engines suffered from a gasket creep problem. MVVS is the only engine I have ever seen that in some cases had a grease zerk located near the front bearing.
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Old 10-15-2019, 12:48 PM
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That's because in the early production engines the front bearing was open on the inside and sealed in the front.It never got enough oil vapor to last very long. The rear was totally open and had no problems.These are great running engines,and on a pipe or MVVS canister,nothing will touch them.But you need a plane that needs the nose weight.
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Old 10-15-2019, 01:02 PM
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It just looked a bit strange seeing that zerk on there! I owned a MVVS .19 or .20 glo engine for awhile some years ago but quickly sold it when I found the carb was pretty much designed for pipe use and had a way rich or lean (can't remember) mid range that wasn't suitable for muffler use. A very unconventional engine by what many of us would consider normal standards. Lots of Rossi influences in the design.
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Old 10-15-2019, 02:41 PM
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I've got a 58 .. on a can modified from a 100c can to fit a comp arf .. turns a mejlik 24x10 at 7200

My mvvs 116np on mvvs pipes turns a 30 x10 mejlik at 6450
Mejlik 30 x12 5850 .32 x10 at 5800
.. the 30 x10 will RIP on demand..
Trief a 27x12 3b on it .. 5750 .. very quiet.. made hovers easier but spool up was slower than I liked
.
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Old 10-16-2019, 03:37 AM
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Thanks my friend. Now it will be easier to find its carb rebuild kit or at least diaphragm. Engine starts but when I try to increase the throttle, it dies. It was stored from last 2 years
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