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Old 04-04-2010, 04:27 AM   #16
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Quote:
Originally Posted by fdjizm View Post
The crankshaft in a one cylinder engine has always been a debate, myself I don't think it's possible I believe the weight is there to move the resonance frequency higher to get higher rpm's when metal inside an engine starts resonating it's hard to get past that vibration point and get speed.

Heavier/denser resonates much later = no vibration barrier to compete with.
Most high end crankshafts are lighter, but the slugs in the counter weights are denser.

But that's just an educated guess
Most balance weights added are tungsten which is much heavier than steel. The above comment is spot on, and the resonation point would be much higher with a heavier bottom end.
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Old 04-04-2010, 10:14 AM   #17
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Nice pics !
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Old 04-09-2010, 04:42 PM   #18
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Quote:
Originally Posted by RayJ View Post
Most balance weights added are tungsten which is much heavier than steel. The above comment is spot on, and the resonation point would be much higher with a heavier bottom end.
I agree balancing a two stroke crank is basically impossible and always has been.
the tungsten insert is a counter weight designed to do the above.
Resonation causes the engine to vibrate anywhere between say 5000 & 15000 rpm by using a counter weight it would shorten it to around 5000-10000 or something like that.
a good example is HONDA they use a counter weighted cam shaft to offset resonation at 3500 rpm .if they cant balance a crank how is it max power can?
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Old 08-17-2010, 01:09 PM   #19
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Default MX 12 MAX XXL3 WC TEXAS

here comes the WC

from MAX web

Techinal details

Capacity 2,1 cc
Power 1,69 HP
R.P.M. 44.200 g/min.
Bore 13,70 mm
Stroke 14,25 mm
Ports 3
Sleeve ABC
Piston BAR (CNC)
Crankshaft Diameter 11,50 mm
Crankshaft with Tungsten YES
Silicone To The Inside YES
Crankshaft Type TURBO SG
Glow Plug TURBO
Carburetor SINGLE ADJUSTING
Weight 225 gr.
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Max Power XXL3 Balanced .12 engine ~~FULL PHOTO~~-138.jpg  
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Old 08-17-2010, 01:12 PM   #20
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Default oops

with update turbo head too (with O-ring)
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Max Power XXL3 Balanced .12 engine ~~FULL PHOTO~~-139.jpg  
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