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mvvs 49 with tuned muffler

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Old 07-19-2007, 06:29 AM
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asmund
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Default mvvs 49 with tuned muffler

Today I tached my 49 running 5% nitro 15% synth oil and APC 12-4. All leaned out it produced 14200 rpm which is 200 more than last time I tached it, I guess it is fully broke in now after about 3 gallons. I`m very impressed with this number and it actually passes my tuned ASP 52 XLS, if only barely
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Old 08-14-2007, 10:42 PM
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Default RE: mvvs 49 with tuned muffler

The MVVS-49 is a monster, especially in the torque category- That is a REAL good number for 5%

I gotta try one of those...
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Old 09-24-2007, 12:42 PM
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Default RE: mvvs 49 with tuned muffler

I just broke my MVVS 49 with Genesis Throttle Pipe in this weekend. The prop is an APC 12.25x3.75 and whilst I didn't get any figures the spool up was quite sluggish (to be expected I s'pose!) Fuel is ProSynth 5% but it's only had 1/4 gallon through so far.

Has anyone got any tacho numbers on this prop?
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Old 09-24-2007, 01:11 PM
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Default RE: mvvs 49 with tuned muffler

Hi, I get 13600 rpm at peak on that prop on my 49. The slow spool up on that heavy prop is the reason why I went to the APC 12-4 instead as it spools up much quicker.
Also make sure you have leaned out the low end needle enough, otherwise the transition will be very sluggish no matter what
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Old 09-25-2007, 02:29 PM
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Default RE: mvvs 49 with tuned muffler

Great stuff, thanks Asmund
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Old 09-25-2007, 02:36 PM
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Default RE: mvvs 49 with tuned muffler

Your engine will develop more rpm`s and power after it has been running for a couple of gallons. Mine has become stronger and stronger the more I run it.
By the way, it would be really interesting to hear what rpm`s you get on the 12.25-3.75 using that Genesis throttle pipe, when and if you have some tach readings
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