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MVVS 21's

Old 07-31-2010, 11:57 PM
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kakariki
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Default MVVS 21's



Hi All
Does anyone have MVVS 21's and what do they think of them.
Thanks Barry

Old 08-01-2010, 04:46 PM
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pe reivers
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Default RE: MVVS 21's

This is the MVVS support forum. I think you should post this question in glow engines general.
Old 08-01-2010, 05:30 PM
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Default RE: MVVS 21's

Hi
Ok I will, do you have any parts for these, and what is available.
Thanks Barry
Old 08-02-2010, 02:19 PM
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Default RE: MVVS 21's

The engine is discontinued, but still got carbs, cylinder/piston/conrod sets and crankshafts for the dedicated few.
Old 08-02-2010, 05:12 PM
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Default RE: MVVS 21's

Hi
I have a pair of 21's with one 'reversed' (counter rotating), is there props available for them eg. matched pairs.
Thanks Barry
Old 08-02-2010, 05:40 PM
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Default RE: MVVS 21's

Several prop manufacturers produce lefthanded props.
Old 08-04-2010, 06:41 PM
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Default RE: MVVS 21's

Hi
I have just purchased these as a pair, one has "R" stamped on the crankcase and has the exhaust on the opposite side, which I believe is counter rotating, did MVVS make these as pairs like this?
Thanks Barry
Old 08-05-2010, 09:07 AM
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pe reivers
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Default RE: MVVS 21's

yes. The LH engines were available at a little extra cost.
Old 08-07-2010, 12:29 AM
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Default RE: MVVS 21's

Members in my club here are telling me that these are race engines, and are quite powerful for there size, is this true?
If so, as a '21', how would they compare say to an OS 25 for example.
Barry
Old 08-07-2010, 07:15 AM
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pe reivers
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Default RE: MVVS 21's

more cubic inches have more torque at lower rpm. Well tuned, the mvvs has more power.
Old 08-17-2010, 05:31 AM
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Default RE: MVVS 21's

Hi
I read somewhere that it is best to run these 21's with castor oil as opposed to synthetic oil. The manual states that castor should be used during run in, but doesn't mention normal running.
The article I saw was about these engines overheating with synthetic oil and too much nitro, so I'm wondering what ratio of oil and nitro I should use, as I'm using them in a twin I want them to run smoothly and in sync.
Thanks Barry
Old 08-17-2010, 01:18 PM
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Default RE: MVVS 21's

max 2% nitro, 1:5 castor oil, or castor synthetic blend. (some blends work, some do not) Castor always works OK.
Engines do not overheat because of the oil. They just run worse with every tankful, until they get castor.
The manual nowhere says you can use synthetic.
Old 10-27-2010, 12:48 PM
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Default RE: MVVS 21's

Hi!
I have engines and spares!
Regards!
Jan K
Old 10-27-2010, 12:52 PM
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Default RE: MVVS 21's

Hi!
That is correct!
All small MVVS engines (under 6,5cc ) runs better on 18-20% castor oil (or a mix of castor and synthetic) than on just 15% all synthetic oil(that's what most fliers over here use).

Regards!
Jan K

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