Fastsky

Anyone familiar with MVVS engines?? They are available locally but I haven't even seen one at our field. I am always looking at new stuff and there is supposed to be fall blow pricing on the 77 size engine. [8D]

WCB

The ones I have seen ran very strong. I haven't heard any complaints.

fearlessJOE

I have seen several on various firewalls, seen many take off runs, but have never seen one fly. they seem to have idle-midrange trouble.

Doug D.

I've ran the .49 and .77 MVVS engines with very good success. Yes they have midrange problems, but that comes down to mixture adjustment and back pressure. They like a little extra back pressure compared to some engines.
They run well with no or low nitro, 0 to 5%. That's the way they where designed. If you want to run higher nitro content fuel you'll need to add some head shims.
Morris Hobbies gives good customer support on these engines. At least they have for me.

glommes

I've flown a profile plane with an MVVS .40 on it and that was the best engine I've ever seen! To start it, all you have to do is flick the prop backward. It is much stronger than a cheaper engine of the same size, such as the OS sport model, and the idle characteristics are also outstanding. Never had any problems at all with this engine. I would highly recommend it.

phread59

Fast I have several of the early 40's. All I can say is phenominal. I have one in a Midstar 40 with a tuned muffler. I added wheel pants and made it a taildragger. I have an APC 10-6 on it right now. When you break ground you have to be on the rudder. As the P-factor will want to turn it left real hard. I am running 10% byron's sport fuel in it. I live in Central PA at about 3500 feet above sea level. The engine is an absolute animal. I am sure I could hover the plane with some prop tweaking it has that much power. It is stone reliable as well. Just prime it and one flip and it is running. I have started it just by twisting the Higley nut. It is robustly built, no flimsy plastic junk. I absolutely love this engine. People who have seen it run just cannot believe how strong it is. With the minipipe it is a little slow comming up but once it clears itself, hang on. This is normal with pipes though and is easily dealt with. It is very unfinicky. Once I got mine set up I never touched the needles. Just fuel it and go. the supplied plug failed fairly quickly. I put a Fox idle bar plug in and all was well. I cannot reccomend these engines highly enough. I would definetly emplore you to get one and see for yourself. BTW they do not like nitro and do like a decent size prop. They are tuned slightly lower than you would suspect. Due to them being an FAI engine. 5% fuel is all you really need unless like me you are up in the mountains. Good luck with it, I know you will enjoy it.

Mark Shuman

Cyclic Hardover

My Feedback: (3)

Well I bought one specifically for this F20 about 5 years ago on the word of one guy at Morris Hobbies named "Robert. " He specifically told me that the MVVS.40 size Q500 would run equal to the YS45 with a 9/6 or 7 apc prop.

Now I won't lie here. The engine did run very well but had no more power and a common 46fx as far as I was concerned. I had countless conversations with this guy until I realized he was just "full of it." I removed the engine, sold it and bought the Jett.50

vicman

My Feedback: (10)

I like my .45 and am getting ready to put a .28 in a plane w/in a week.[X(]

tIANci

My pal runs the MVVS49 ... I have been helping him tuning it and all. The engine is easy to tune and idle is pretty low for a 2C, only thing I do not like abou the engine is the looks and finish. The pipe sucks as the screws can come loose if you do not check it periodically. Also, please use some thred lock on the low end needle, that too can drop off.

Performance wise we tached it at 13,600 on an APC 10x7 with 5% nitro. Remember I am in the tropics and its hot and humid here, you would get 14K on your end!

Seen the MVVS90 also, not impressed but then again the guy running it is not a good flyer who knows how to tune an engine well. Seen the 160 glow run with the MVVS full lenght tuned pipe. Engine is new hence only turning 8,500 RPM but its so easy to start by back flipping her using the prop or spinner!

Would I buy it? No ... its personal preferrence NOT based on performance. Based on performance and price its a gerat engine to own! Bonus is this ... they run great in 5% nitro!!!

calnev4bob

My experience with MVVS engines has been good. Prefere them to the many O S engines I've owned.

Fastsky

Thankx for the feedback guys. I didn't know about the low nitro fuel. Since my other planes are running on 10%, that could be a factor. I haven't started working on my wifes plane yet so I still have time to review things.

phread59

Hey Fast as I said before. I run 10% in mine with no ill effects. I still say tyry one you'll like it.

Mark Shuman

Fastsky

Tthankx phread. I got hung up on the second last line about the FAI 5% fuel whcich puts these engines back in the running. Still going to think it over a bit.

phread59

Hey thinking just fills the air with smoke. Just go and get one. You want one, don't you, don't you. You need one, you need one. You are getting sleepy.

Just poking fun. I live at 3500 ft and the extra nitro does not hurt. I have talked to other owners and read and seen lots about these engines. 10% is about the max without modification. 5% would be perfect. Just remember they are more of a torque engine than a screamer. People who don't like them usually are trying to make them something they are not. Trying to get too much speed, too many rpms out of them. Stick to how they are designed and you will like them.

Mark Shuman

xanaphyst

My Feedback: (17)

I have the 49 GFS/R on mini-pipe and I really like it....I do find that the high needle is a little touchy but other wise is great.
I have to agree with the torque comment ...mine loves a APC 12+4 on a tower Kaos. Always make sure to drill out the clunk
on those ARF's....I blamed the engine as a piece of junk until I drilled the clunk and all the problems went away..

xanaphyst

vicman

My Feedback: (10)

Drill the clunk?? Please explain.

phread59

Vicman with a powerful engine and a tuned exhaust fuel consumption is high. It's an old addage, to make power you need fuel. The klunks on most tanks have a small pickup hole in the klunk in the tank. You drill the hole out to allow more fuel flow. It is as simple as that.

Fast, did you get one yet. Trust me you'll be glad you did.

Mark Shuman

shaun1

I have both the 49 and the 61, absolute superb engine, powerful and strong motor with amazing throttle response-excellent value for money!!!!

xanaphyst

My Feedback: (17)

switched my .49 over to the GP Venus....a good combo..to bad the airframe is completely worn out...but still flys great


xanaphyst

Woody 51

Go up to the "Glow Engines" part of this discussion forum and check the MVVS threads there.

Then if you want any info on the brand, leave a message there for a a guy who goes by the name "DarZeelon".

What this guy DOESN'T know about running and tuning any of the MVVS range can be written on the palm of a baby's hand.

Fastsky

Thanks Woody. I will check it out. [8D]

jaka

Hi!
Why not get the MVVS 15cc (.91) instead ...same size and weight as the 12,7cc engine (.77) but more power!

Regards!
Jan K
Swedish MVVS distributor

Fastsky

jaka, if I went with the 91, what size fuel tank would I need for a 12 minute flight??

Woody 51

Fastsky, you can get onto Dar at : [email protected]

He tells it like it is and gives credit where credit is due. No B..S from this guy.

jaka

Hi!
Well I fly my GP GEE BEE R-2 with a MVVS 15cc engine and use a Tettra 450cc (15)oz "bubbleless" fueltank and fly for around 12-15 minutes.
Fuel is 15% all synthetic oil (Motul "Micro" ) and 5% nitro. I mix my own fuel.
Glowplug is Enya 3.
Propeller is 14x6 APC...will try a modified (thinned down, slimmer ) 15x6 APC next season. Just now we have winter over here .

Regards!
Jan K
Sweden