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MVVS 26 not enough power?

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Old 08-06-2006, 08:21 PM
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aerofundan
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Default MVVS 26 not enough power?

I'm using a MVVS 26 Gas engine old version, the one with the round ignition, and I'm only getting 6700 with a Zinger 20x6 and with a Master Airscrew 16x8 I'm only getting 7250, i'm using a bisson pitts muffler, is this enough power for this motor? To me it feels like its not developing enough power
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Old 08-06-2006, 11:52 PM
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Default RE: MVVS 26 not enough power?

Daniel,


A 16x8 at 7,250 calculates to less than 1.25 HP, which is definitely low.
The 20x6 prop at 6,700 is, on the other hand, nearly 1.8 HP, at a lower RPM level...

...This would for sure indicate the Bisson muffler you are using is choking, strangling, gagging...

Change that first; the #3270 MVVS Pitts and I dare say, even their #3298/26 dust bin is less restrictive.
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Old 08-06-2006, 11:55 PM
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Default RE: MVVS 26 not enough power?


ORIGINAL: DarZeelon

Daniel,


A 16x8 at 7,250 calculates to less than 1.25 HP, which is definitely low.
The 20x6 prop at 6,700 is, on the other hand, nearly 1.8 HP, at a lower RPM level...

...This would for sure indicate the Bisson muffler you are using is choking, strangling, gagging...

Change that first; the #3270 MVVS Pitts and I dare say, even their #3298/26 dust bin is less restrictive.
You think its the muffler?? You have to see the idle it has, the transition is awesome!! but it just has absolutely no power! I used a tach to adjust the max out of it, but thats the max it can get... I don't have any other muffler to try it, maybe i can try it with no muffler to see what RPM i get?

Daniel
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Old 08-06-2006, 11:57 PM
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Default RE: MVVS 26 not enough power?

also, is there any difference between this old version and the new version? and if so what is the difference? and can this old one be upgraded?
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Old 08-07-2006, 01:53 AM
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Default RE: MVVS 26 not enough power?

Daniel,


The basic design of this engine has not changed over the years.

There were, however, some subtle changes that may have a positive effect on power.
For example, newer engines are equipped with a piston that had been graphite coated.

It has, besides an obvious longer life and very low wear, a lower level of friction that can contribute minutely to power.


The exhaust you have is having an obvious bad effect. This engine will make over 3 real HP, without much strain.

It should be able, with the #3268 pipe, to exceed 9,000 RPM with an 18x6 prop, or about 8,400 with an 18x8.
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Old 08-07-2006, 07:13 AM
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Default RE: MVVS 26 not enough power?

You have the old version with the small 7mm carb. A very sweet running engine.
Later versions have increased carb size for better power.
With the round ignition there are two possibilities to increase power:
1) with the plain, non coated piston, drill out the carb to 8mm (only when run in very well, you can go to 8.5 mm)
2) with the graphite plated piston, drill out to 9mm, or order a new carb.
The carb still wil be very responsive. This is a very nice Walbro indeed, and very forgiving.
Be sure to have a very sharp drill, ground for brass (negative cutting angle)

The Bisson muffler is not that bad, and should turn over an 18x8 in excess of 7000 rpm. Just saw off the crimped ends of the stingers.

Only use fully synthetic two stroke racing oil mixed at 3%. Don't settle for less.
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