MVVS 6.5
11-17-2005, 12:21 PM
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MVVS 6.5
A friend no longer in the hobby passed on a MVVS engine 6.5 Black head engine to me. It has a regular type muffler as well as a tuned silencer #3248n. Looking at the MVVS website it looks like a .40 size. What nitro setup should I use in it? Prop? Should I go with the tuned pipe? I'm looking to put it on a 40 size stick plane to use for sport flying. Thanks.
11-17-2005, 12:52 PM
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RE: MVVS 6.5
No nitro (if you must, 5% max), and 20% oil, preferrably half of it castor.
Props used depend on silencer and plane. The 3248 muffler, use with 9x6 to 10x6 props.
Props used depend on silencer and plane. The 3248 muffler, use with 9x6 to 10x6 props.
11-17-2005, 01:18 PM
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RE: MVVS 6.5
Thanks for the feedback. Will go with no nitro. I noticed the 2 needle valves. It is difficult engine to set up? Will probably run the 3248 muffler. Thanks very much.
11-17-2005, 01:46 PM
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RE: MVVS 6.5
Seatonflyer,
If it is the blackhead .40/6.5 GFS/R, the carburettor is by all chances one of the older styles.
It could either have the springy main needle, or a solid one.
The older carburettor had a simple air-horn and an idle-stop screw on top.
The low-speed needle is blunt ended and adjusting this engine for a perfect part throttle mixture may prove difficult.
The engine will load up somewhat, when run for more than a few seconds, at 1/4-1/2 throttle.
MVVS offers a partial solution, with a new tapered low-speed needle and nozzle set, but despite its higher cost, only upgrading to the new #3219 carburettor works well.
The new carburettor does not have an idle-stop screw (just a locator) and the air-horn is elaborately shaped, allowing better suction of fuel, even with a larger bore.
Here is a photo of the new .49/8.0 GFS/R with the new carburettor.
If it is the blackhead .40/6.5 GFS/R, the carburettor is by all chances one of the older styles.
It could either have the springy main needle, or a solid one.
The older carburettor had a simple air-horn and an idle-stop screw on top.
The low-speed needle is blunt ended and adjusting this engine for a perfect part throttle mixture may prove difficult.
The engine will load up somewhat, when run for more than a few seconds, at 1/4-1/2 throttle.
MVVS offers a partial solution, with a new tapered low-speed needle and nozzle set, but despite its higher cost, only upgrading to the new #3219 carburettor works well.
The new carburettor does not have an idle-stop screw (just a locator) and the air-horn is elaborately shaped, allowing better suction of fuel, even with a larger bore.
Here is a photo of the new .49/8.0 GFS/R with the new carburettor.
11-17-2005, 02:06 PM
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RE: MVVS 6.5
Dar,
The carb has the "springy" main adjust. I will contact MVVS Canada to see if I can get the newer carb to replace the old one on the engine.
Thanks,
Seatonflyer.
The carb has the "springy" main adjust. I will contact MVVS Canada to see if I can get the newer carb to replace the old one on the engine.
Thanks,
Seatonflyer.
01-03-2006, 12:13 PM
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RE: MVVS 6.5
I have a few .40 MVVS Engines and used one this weekend on a WMA Raider Mk II. The header broke right at the exhaust flange. I have two other headers that are two-piece and was wondering where I can get the silicone o-rings to replace the (used) ones I have? Can't seem to find anything on the Morris website...
