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Prop for a MVVS 40

Old 06-24-2006, 01:02 PM
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Default Prop for a MVVS 40

Any thoughts on what would be a good prop for an MVVS 40 on a Morris Sukhoi ? And what kind of fuel consumption I can expect with that engine.
Old 06-24-2006, 01:14 PM
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Default RE: Prop for a MVVS 40

Steve,


I assume you are using your engine as it came, with no extra head shims (not decompressed) and on 20% castor/synthetic blend, or all castor, with only 5% nitro. (If not, this is what you must use)

I also assume you have the #3248 tuned silencer on it.

A good prop size to start from is a 10x6, or for a 3-D model, an 11x4 APC.

You should be seeing over 14,000 RPM on that prop.

If you have the normal #3245 muffler, expect somewhat less RPM.


You should expect over 15 minutes on 10 ounces of fuel.

If you did not do the break-in yet, please follow [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]this thread[/link], for a job well done.
Old 07-05-2006, 07:15 PM
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Default RE: Prop for a MVVS 40

DarZeelon
i was given a 6.5 mvvs and am not sure how old it is,it has a red head on it.i read a thread here about tuned mufflers the header pipe and muffler that i got with it isn't what the tuned specs called for, either someone didn't tune it properly or didn't realize how to.the header is 3 1/2 inches long by what Ive read with an apc prop i should start at 5 3/4 .can i use a silicone tube as an extension to get the header pipe back to 5 3/4?the tuned muffler that came with the engine is about 12 inches long I'm not sure who it is made by there are no markings at all on either the header pipe or muffler
Old 07-06-2006, 12:33 AM
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Default RE: Prop for a MVVS 40

Dennis,


The MVVS #3248 tuned silencer and header look like the parts in the photos.


If the header is too short, you can add short pieces of 18 mm O/D aluminium tubing, within silicone coupling tubes.

The MVVS emblem has been added about three years ago.
Your engine is of a significantly older vintage.
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Old 07-06-2006, 01:11 AM
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Default RE: Prop for a MVVS 40

mine says mvvs and it has a number under the mounting rails I'm curious what engine it is actually,i put a 7mm bolt down the throat of the carb it fit perfectly,Ive never seen one with a red head though,i ran it yesterday it fired right up.i assume it has had a few hours on it but it ran fine
Old 07-06-2006, 04:16 AM
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Default RE: Prop for a MVVS 40

Horace this sound like the old quickie to me, is the head red though or brown?
Old 07-06-2006, 04:55 AM
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Default RE: Prop for a MVVS 40

Eftychios,


What determines if it is a Quickie, or not, is the port timing.

The Quickie sleeve has/had 165-170 degrees of exhaust timing, while the normal sleeve has about 155 degrees.

Also, the old #3068 Quickies had the old 8 mm #3219 carburettor and new Quickies have the new, 9 mm #3219Q. This engine has a 7 mm carburettor...

The two-part head on some of the older Quickies was black. I don't think that MVVS ever issued Quickie engines with heads of other colors, until the current version, which has a gold head.

This engine is more likely to be the normal #3066 6.5 cc engine.

Old 07-06-2006, 05:27 AM
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Default RE: Prop for a MVVS 40

Thanks for the info Dar i have not seen properly that horace mention about the 7mm carb inlet, about the the 165-170 degrees of exhaust timing i didn't know although i have one very old quickie which is brown color maybe it was black and from the use of a lot of years gone brown. But still runs perfectly, thats one of the greatest glow engines i ve ever seen. What it concerns me is that i have 2 new quickies with 9 mm carb inlet but the sleeve has about 155 degrees i will need to check it more carefully and if thats the case i will let MVVS to know maybe it was a mistake on the production of those 2.

Regards
Eftychios
Old 07-06-2006, 03:59 PM
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Default RE: Prop for a MVVS 40

i will take a few snapshots of it and post them Dar,i am colored blind it might be a brown head to me it looks red but the motor is dirty from setting up.i don't think it has been ran for several years the carburetor was seized but a little oil and finesse and it operates smoothly thanks
Old 07-06-2006, 04:27 PM
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Default RE: Prop for a MVVS 40

here is a few photos of my 6.5
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Old 07-06-2006, 09:45 PM
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Default RE: Prop for a MVVS 40

Dennis,


This engine is at least 10 years old.
It seems that was a red head.

If it says '6.5' on the side (it is not in focus), it is a normal MVVS .40.

It has a (Macs) tuned pipe, which when adjusted properly, will give you more power boost than the tuned-silencer/mini-pipe.

That tuned-silencer will give you a better response, but with that Four-Star you don't need 3-D like response.
That old, blunt-idle-needle carburettor will hamper adjustability and response, however.
Old 07-06-2006, 11:34 PM
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Default RE: Prop for a MVVS 40

is there an alternative type carburetor i could use?the high end adjustment needle seems like it would vibrate loose.also is there any place i can get a parts and maitence manual?
Old 07-06-2006, 11:48 PM
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Default RE: Prop for a MVVS 40

Dennis,


If you basically know how to adjust a glow engine, you need no manual!

Just use fuel with 20% oil, of which at least half is castor oil.

Always run the engine dry, by removing/choking the fuel line at full throttle, at the end of the day.
After-run oil is extra insurance.

Adjust the engine to run at peak, 100-150 RPM richer than maximum, with the plane's nose pointing straight-up.
This means about 300 RPM rich with the plane level, but check it with the nose up!

This engine needs no maintenance as such, but disassembly requires metric Allen wrenches.

That new carburettor is available from MVVS dealers.

Unless the 'clicker spring' isn't functional, that high-speed needle will stay put...

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