RE: MVVS 80 ccm
 

Ho, Ho, some more testing done??
Thanks Pe for thinking of me for a 80, but when our new toy arrived there was a box in it labeled MVVS 80
so I have just got one of course with no manual. So the test results from you and JANCH is very interesting.
//Lennart

RE: MVVS 80 ccm
 

OK, here are the final results:
Lube MVVS oil (mobil1, red, 1:25), Fuel 98 RON (premium 93 PON), Prop 24x10x3 Mejzlik. Exhaust Header 14”, outer dia 28mm.
TD 75KK, shortened, 6390, 7.7hp
TD75K, 6460, 8.0 hp
3204 mvvs,6350, 7.6 hp
TD110 6450, 7.9 hp
TD75,6420, 7.8 hp
MTW T3 tuned pipe 7000 rising to 7100, 11.0 hp

MVVS reported 10 hp on their new design canister muffler, still in testing phase. JANCH has one of the prototypes on his plane. Maybe he can comment on final rpm.

The fact that the TD75K turns faster than the TD75 leads to the assumption that the header pipe is too long for these mufflers (the TD has a longer inner section of pipe as compared to TD-K)
The TD75KK is shortened to even shorter total length to try how it would run. Penalty in power is not too high, and the muffler has excellent muffling and power response. First chamber volume (403cc) is only 5x engine displacement. No signs of sagging in power, so thermal load on the engine is OK.

RE: MVVS 80 ccm
 

Hi to all pilots,

We made test with different propellers.

JAS 26/9 6 900 rpm
JAS 27/10 6 340
Bambula 26/10 6 230
Mejzlik 27/10TH 6 210
Mejzlik 26/10 6 610

Ignition plug and play. I did not change preignition /advance fire /

We had very low temperature only + 10 degrees Celsius

RE: MVVS 80 ccm
 

Thank you very much Jan
MVVS seems to have a winner with their int 80 muffler.
I calculated 8.5 to 9.1 hp over the whole range from 6250 to 6900 rpm

RE: MVVS 80 ccm
 

I have be patient because my engine is still in break-in period. I think after break-in I will add same % on power.
Very important are conditions - humidity, temperature etc.
You can see here 2nd aplication

http://www.horizonhobby.com/Products...ProdID=HAN1225

RE: MVVS 80 ccm
 

Hi Pe and Janch what is the length from the drive washer to the end of RE3 pipe or canister.
I would like the 80 with pipe in our Krill SU-29-33% but I'm not sure it will fit.
I'm also a little concerned about vibrations. I surely have to reinforce the firewall because
its only a big flat ply. Its our first big single, only had big twins before.
//Lennart

RE: MVVS 80 ccm
 

Hi,
I do not have exactly numbers / size/
Canister incl header is 460 mm +- 10 mm.

Is relevant info for you ?

RE: MVVS 80 ccm
 

Lennart,
The tuned pipe dimensions for MTW RE3 (in stock ;) )are on my web page. A lot depends on how you configure the header.
I ran the engine with 350mm header length ( 14" ), Response was crisp and typical for a header that is too long, which is what is best for aerobatics. With that setup, I had 11 hp at 7100 rpm. These horses mainly are available for accelerating the prop.
The way you bend that 350mm into shape of course defines your total length. Best solution would be to leave a lot of tunnel length available behind the pipe so you can experiment, and cover it later with clear cote for aerodynamics.

RE: MVVS 80 ccm
 

Pe,
didn't you found leaks or doubts in the transition? no "punch" effect at certain rpms?
Is the r3 a double cone type?
Thanks

RE: MVVS 80 ccm
 

Is there any using this engine?
Anyone who has put this engine on standoffs ?
Has it the same problem as DA85?

Pleace write about it, I will as soon as I have solved the problem with standoffs.
/ Lennart

RE: MVVS 80 ccm
 

With the smallish 24x10 prop there were no dead spots whatsoever at the 14"header length combined with the RE3 tuned pipe.
This was not my engine. I ran it for a customer, so I had to be careful. The test stand data, whilst providing a general feel for the engine, are not the same as in a plane where the engine is loaded even less.

MTW pipes are of double cone design.

For full test data, see http://prme.nl/forum/viewtopic.php?t=213

RE: MVVS 80 ccm
 

Just some pict of pipe inst Krill SU-29.
14" header RE3 pipe.
Not soldered yet and no pipe support
Problably building box for engine instead of 70mm long standoffs.
/ Lennart

RE: MVVS 80 ccm
 

That looks like a nice setup. I hope you do not fit a 24x10x3 prop on it like I did. It rips.

RE: MVVS 80 ccm
 

Hi,

I made today same tests with MVVS 80

PROP,

JAS 26/9 7150RPMS
Mejzlik 26/10 ..6700
Mejzlik 24/10/3 blades .... 6600

RE: MVVS 80 ccm
 

Hi to all,

is here someody new user for MVVS 80. I have to say. last 10 days my engine had eaten more than 10 liters.

RE: MVVS 80 ccm
 

Hi again guys!
The past weekend I test my new airplane and the new MVVS 80 IRS or EVOLUTION 80 GX2,please look the link with the mounting and same pics,and a small video[8D]:

http://www.acro3d.com/public/phpbb3/...t=7245&start=0

[youtube]http://www.youtube.com/watch?v=1YHquKSDPzg[/youtube]

RE: MVVS 80 ccm
 

Hi,

It realy perfect.

RE: MVVS 80 ccm
 

Very powerful and quiet too. Nice!

RE: MVVS 80 ccm
 

Yes,is a pecfect combo,very powerfull!
In the next flying day I test two props,a Menz´s 27x10 (this is not test) and a Mejzlik 27x10 TH (I test 6520 rpm).
I post the news with a small video here,;);)

RE: MVVS 80 ccm
 

Nice..teremel it looks powerful. Congratulations, Its the first video I ever seen of the engine perform in a plane.
Now, I got a good push in my back to get our SU29 ready with the MVVS 80 to this IMAC season.
/Lennart

RE: MVVS 80 ccm
 

Hi,
I would like to add doule of MVVS 80 ccm. It is 152 ccm.
http://www.youtube.com/watch?v=vXkhZceCa4w

RE: MVVS 80 ccm
 

Jan, did you use int58 mufflers or int80. The couplers look like int80, but I know that MVVS needed some time to get the int80 onto market.
I have watched your video a couple of times before. Good takes.

RE: MVVS 80 ccm
 

Hi,

I have INT 80 and header 80.

RE: MVVS 80 ccm
 

thanks.

RE: MVVS 80 ccm
 

This video for MVVS 152 is not my model. He is Mr. Hofmann.