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Old 09-17-2010, 10:12 AM   #1
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Default Mugen Ninja JX21 Question

Folks,

Appologize for the newbie question. I'm new to RC Cars and have finally completed my Mugen MBX6T M-Spec. The engine I'm using is the Mugen Ninja JX21. I read the engine break-in bible, and plan to follow this method, but not sure about how to determine/find BDC.

Can anyone point me in the right direction?

Thanks,
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Old 09-17-2010, 10:21 AM   #2
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Folks,

Appologize for the newbie question. I'm new to RC Cars and have finally completed my Mugen MBX6T M-Spec. The engine I'm using is the Mugen Ninja JX21. I read the engine break-in bible, and plan to follow this method, but not sure about how to determine/find BDC.

Can anyone point me in the right direction?

Thanks,
(BDC) stands for bottom dead center of the rotating assembly IE: piston, rod, crank. BDC is 180* from top dead center. when you spin your flywheel over by hand you can feel the compression as the piston moves up towards TDC. You can feel/put your piston at BDC by simply feeling the rotating assembly by spinning your flywheel till you feel it at BDC. no resistance at BDC. understand? you should always put your piston at BDC after turning your engine off. this will help with the life of the piston and liner.
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Old 09-17-2010, 10:24 AM   #3
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You can do one of two things-take the glow plug out and move the flywheel with your fingers while watching the piston. Or, you can take the backplate off the engine and visually see the piston at BDC. Either way, once you find it, place a mark on the flywheel for reference. BDC is bottom dead center and is the lowest point in the cylinder the piston is at during its stroke.
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Old 09-17-2010, 10:35 AM   #4
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Joe's way is soooooo much easier.
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Old 09-17-2010, 10:52 AM   #5
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Thanks guys!
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Old 09-17-2010, 11:41 AM   #6
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You can do one of two things-take the glow plug out and move the flywheel with your fingers while watching the piston. Or, you can take the backplate off the engine and visually see the piston at BDC. Either way, once you find it, place a mark on the flywheel for reference. BDC is bottom dead center and is the lowest point in the cylinder the piston is at during its stroke.
Dam your making it hard
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Old 09-17-2010, 01:31 PM   #7
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Really? Taking a glow plug out is hard? Plus, I figured for a newbie, he may not know just by feel, but after he gets used to playing with his motor and using a visual indicator of where bdc is, it'd be easier for him.
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Old 09-17-2010, 01:38 PM   #8
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Really? Taking a glow plug out is hard? Plus, I figured for a newbie, he may not know just by feel, but after he gets used to playing with his motor and using a visual indicator of where bdc is, it'd be easier for him.
I liked your idea of marking the flywheel... that would help for sure.
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Old 09-17-2010, 02:09 PM   #9
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That really helped me out initially but it becomes a feel thing overtime for sure.
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