Post your mvvs/evo 58 tach readings
thanks

Is this the engine that has an "attachment" to count rpms electronically? I don' t own the engine but it seems that the technology should be there since the ignition system is "counting" how many times the sensor passes the magnet anyway. Maybe I am not expressing this correctly but hopefully, you know what I mean. Seems natural all electronically fired engines should have that capability sooner, rather than later.

Larry

Link...

http://www.justengines.unseen.org/mv360p.htm

Have fun

I've started mine yesteday for the first time (evo58gx2)
with a wood prop 24x8 and this muffler

idle is 1600 and full rpm is 6800

MVVS58Pro with a MTW 75K cannister exhaust, 22x10 three blade Mejzlik, 7650rpm. two tanks of fuel through.

Mike

MVVS 58 w/early Vlach ignition. BCM wraparound w/ rolled tips removed. 6200 on a XOAR 24-8
Z

58cc engine at sea level, ~60% humidity:
Test with MTW test reso pipe: rpm, header length cm, header dia mm; remarks
Mej 22x10, TDreso;7700;25;28; slight hunting (unstable top rpm 7600 - 7800)
Mej 24x10;TDreso;6500;25;28; slight hunting
Mej24x10;TDreso;6800;40;28; slight hunting
No hunting at richer carb settings

Tests with KS 50 reso pipe:
mej 22x10, KS50reso; 7600; 25;28; steady rpm

Tests with final (available) 4-chamber MTW tuned pipe as soon as I can manage.

evolution 58gx2
header dia. 28mm
length 12"or 30cm
ES Composite pipe
Beila 24-8 carbon prop
rpms 7500
900 ft. ASL

Same muffler 3% kendall GT1 menz 23x8 idle 1400rpm max 6940rpm
Xoar 24x10 6000rpm

I was getting around 5750 RPMs using big wide Top Flite 24x10 prop. I had converted the engine to use the CH-Ignitions system versus the old Valach ignition system. CH-Ignitions has a really nice CNC machined amuminum sensor carrier. Plus the sensor only works with the one magnet, ignoring the second magnet, if you have the oder two magnet Valach system.