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Modella 12( MMVS)D - 7/19/2012 11:13 PM   
AMB


 

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Status: offline 		Finally here it is Modella 12 with muffler , block has Modella on it but is an MVVS

Easy hand start on prime in carb hand held roared off like a lion 3 or 4 flips, contra perfect

It was a control line but r/c carb drop in fit after removing needle and venturi 2 screws hold it in
thanks Dennis its a Gem
would like the muffler screws a little longer only enough length for about 3/4 of threads in mufffler but thats an easy find of not
can allows use threaded rod with nuts both ends


POst note zero time engine will need break in



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< Message edited by AMB -- 7/19/2012 11:34 PM >

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RE: Modella 12( MMVS)D - 7/19/2012 11:45 PM   
pe reivers



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RE: Modella 12( MMVS)D - 7/20/2012 12:03 AM   
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Status: offline 		Haven't run my 2cc diesel yet-despite having bought it 22 years ago (!)-but I have run my glow version-it starts and handles well, though I've only bench run it on an 9x4 on 75:25 fuel. The std venturi may be a little large for C/L use at somewhere between 6.4 and 6.5mm-but it does have a fairly large diameter spraybar. Power-wise it looks to be in the same league as an OPS Max 15 or Enya 15. The only feature I don't like about it is that prop retaining screw-I don't much like it on 1/2A's-and certainly not on anything bigger. Invariably if you get a bit wet or flooded, and there's some kickback the prop loosens up. The Letmo 2.5 replica suffered the same problem.
I must have been luckier than you Martin-both my diesel and glow 2cc's have adequate muffler bolts. On the diesel they're plain grey steel, and finish exactly flush with the muffler lug when screwed home, and on the 2cc glow-which is the more recent of my examples, they're blacked, and project about 0.5mm past the muffler lugs when fully screwed home.

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RE: Modella 12( MMVS)D - 7/20/2012 12:36 AM   
AMB


 

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Status: offline 		Muffler bolt issue solved found 2 screws that project about 2mm past muffler lugs, will make a lock bar for compression screw
have the metric taps and flat stock martin

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RE: Modella 12( MMVS)D - 7/20/2012 12:55 AM   
dennis



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quote:

ORIGINAL: AMB

Muffler bolt issue solved found 2 screws that project about 2mm past muffler lugs, will make a lock bar for compression screw
have the metric taps and flat stock martin



Martin,

Isn't it great to have Christmas in july. Glad you like the engine.

Dennis

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RE: Modella 12( MMVS)D - 7/20/2012 12:56 AM   
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Status: offline 		6mm metric?-Yours a bit loose in the contra department? Mine doesn't have enough thread projecting above the head to fit a locking bar if one turns out to be needed-I'd have to make a new comp screw.

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RE: Modella 12( MMVS)D - 7/20/2012 1:02 AM   
AMB


 

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Status: offline 		Chris the compression screw is short. think you said 6 mm will just get a long allen so enough room for the lock bar martin

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RE: Modella 12( MMVS)D - 7/20/2012 1:29 AM   
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Status: offline 		Martin-in what I assume by feel-(remembering mine hasn't been run yet)-to be the approximate running setting, mine has only two threads still showing above the top of the head-clearly not enough for a locking bar to fit effectively. Weather permitting, I might just try and run mine this coming weekend. Gives me an excuse to try out my noise level meter as well, and see how effective the muffler is-as well as what rev drop it creates. Compared to other diesel mufflers, eg PAW, Frog, AM it is fairly generous in volume-so I'm expecting reasonable muffling without too much power loss. In fact a comparative study of the diesel and glow versions should be quite interesting and illuminating-props, power, noise, fuel consumption etc. In the reverse of the current trend-AFAIK the engine first appeared as a diesel, and only somewhat later as a glow version. Anyway-as far as I know-without a full strip-the diesel and glow versions are exactly the same apart from the head. The diesel is heavier-(just measured- with muffler fitted, and with a std venturi in each case) at 166g for the diesel and 157g for the glow-7g or 1/4 oz difference.

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RE: Modella 12( MMVS)D - 7/20/2012 1:41 AM   
AMB


 

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Status: offline 		Chris will bench and see , looks like contra does not have to go inany more so might be enough threads for lock bar
( its close) if not, new compression screw no big deal but like the tommy bar on the factory one.
sort of a surprise the factory issue one is that short. but not going to nit pick on this one ,minor issue

martin

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RE: Modella 12( MMVS)D - 7/20/2012 2:14 AM   
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Status: offline 		I agree Martin the factory one is a nice job-and with all the attention to detail you expect-hollow-and with the OD reduced at the contact point-so burr-ing of the thread will never occur in use. In contrast with what I can see of the crankshaft with the backplate removed-no balancing whatsoever, and the face of the web indifferently ground. On reflection-the comp screw may well be the same std item as fitted to the higher priced and higher quality MVVS diesels............

ChrisM
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RE: Modella 12( MMVS)D - 7/20/2012 2:26 AM   
AMB


 

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Status: offline 		Chris cannot get the backplate off mine will fiddle a little maybe a little heat, will have to see what the vibration level is on the bench after your read on the crank if a issue can try the unbalanced prop trick then again may bot be an issue, thoughts?

martin

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RE: Modella 12( MMVS)D - 7/20/2012 2:40 AM   
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Status: offline 		I don't recall the glow having problems with vibration-but it must be four or five years since I ran it, Martin. FWIW my backplates both unscrewed without a lot of effort-the back of the breadknife provided just the right fit and leverage............

ChrisM
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RE: Modella 12( MMVS)D - 7/20/2012 2:54 AM   
AMB


 

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Status: offline 		Chris just checked my 09 shaft made same way and never a vibration issue my factory data sheets shows exploded view of both the 1.5 and 2 just different part numbers for each one 09 plastic backplate 12 aluminum martin

thats one view both engines listed

There is no lock bar on the 09 and it was never a problem

< Message edited by AMB -- 7/20/2012 3:22 AM >

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RE: Modella 12( MMVS)D - 7/20/2012 3:36 AM   
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Status: offline 		Hmmn-I suppose we should expect this-there is ample precedent with many Brit engines with plain disc crankwebs and heavy pistons where vibration doesn't seem to be the issue you'd expect-one of my worst engines for vibration is the Alag X-3-which shakes so much on the bench I wouldn't even attempt to fly it in a model. [a pity coz its really small and compact for a 2.5!] Just like you-I don't recall my Model 1.5cc as being a shaker either-a absolute sod to start-but not a shaker.........

ChrisM
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RE: Modella 12( MMVS)D - 7/20/2012 3:54 AM   
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Status: offline 		Chris my 09 took a little fiddling to start a few croaks, after prime ran out but after 3 or 4 times of this game off it went
well have a good one sleep now calls tomorrow is an other day regards martin
THX again for your input

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RE: Modella 12( MMVS)D - 7/20/2012 4:04 AM   
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ORIGINAL: ffkiwi

Hmmn-I suppose we should expect this-there is ample precedent with many Brit engines with plain disc crankwebs and heavy pistons where vibration doesn't seem to be the issue you'd expect.


I have always put  this down to the added flywheel weight of a full circle crank web evens out the rapid onset ignition and compression loads of a model diesel at the expense of primary balance.



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RE: Modella 12( MMVS)D - 7/20/2012 4:30 AM   
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Status: offline 		Possible-but I doubt there's much flywheel effect in an ED Bee, ED Hornet, DC Spitfire/Sabre etc crankweb-they're only about 2-2.5mm thick. It would be an interesting exercise-best conducted with a FR engine (!) to make a number of shafts varying only in the web and balance component-from crescent style, to web cutouts, to peripheral slots, to T-style-and see how much variation there was in vibration, all other things like prop and fuel being kept constant.

ChrisM
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RE: Modella 12( MMVS)D - 7/20/2012 7:17 AM   
Mr Cox



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Status: offline 		These engines are very nice, they are a little better than the 09 as I see it. I haven't had any issues with mine and it runs well on props from 8x6 -9x5. The only thing I've done to one of my engines was to modify the carb for a slightly richer low end (the airbleed bottomed out), here is a little movie before the mod (on a 9x5 prop);



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RE: Modella 12( MMVS)D - 7/20/2012 10:46 PM   
pe reivers



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Status: offline 		The 6mm thread probably is 6x0.5 or 6x0.75, so no standard M6 thread. Use a spring wire to keep the tommy bar in place.


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RE: Modella 12( MMVS)D - 7/20/2012 10:56 PM   
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Status: offline 		Pe great idea and can be almost flush with top of the head and still give the friction lock martin

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RE: Modella 12( MMVS)D - 7/21/2012 5:11 AM   
fiery


 

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That TopStick certainly did not "hang about" once the taps were open!

It sounded lean on the bottom end, and slightly under compressed at full throttle.

Looks to be a nice pairing of airframe and engine.

< Message edited by fiery -- 7/21/2012 9:29 AM >

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RE: Modella 12( MMVS)D - 10/24/2012 2:55 AM   
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Status: offline 		My example.

Any advice on the "Mikro" R/C carburettor would be appreciated. It does not appear to be an MVVS factory product. I seems to have a "disc" for adjustment of idle mixture.

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RE: Modella 12( MMVS)D - 10/24/2012 3:31 AM   
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Status: offline 		Must be an early one I think fiery, they haven't been supplied with that sort of carb for about 15 years-the later?/current? ones are a simple airbleed style. .......unless the carb was intended for the schneurle port 2cc BB glow variant.........[but I think that is a much later engine in any case]? The 'Junior' tag has in my experience always been applied to the 2cc plain bearing engine-whether diesel or glow...........

ChrisM
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