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Old 05-23-2007, 10:35 AM   #8476
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OK... I took some measurements concerning the back top motor mount screw bottoming out on the back lower motor mount screw.

Top Hex screw 12mm long (threads only)
Lock washer .7 thick
effective threaded screw lenth 11.3

Novarossi SCT above mount to bottom of mugen motor mount 18.4
Top Hex screw goes down 11.3 - 18.4 leaves 7.1 distance remaining in Mugen motor mount rear screw hole

Bottom screw lenth 8mm with concave washer installed leaves 6mm effective threaded lenth

6mm screw lenth - chassis thickness 1mm lets screw go in 5mm

7.1mm left in motor mount - 5mm leaves 2.1mm gap between screws (STOCK manual setup)

IF YOU USE a bottom screw that is 2MM (SJG3x10) longer you ONLY leave .1MM gap between the two screws. This could easily be closed up depending on how tight you tighten your screws. I would NOT suggest using LONGER screws on the rear TOP or BOTTOM screw of the motor mount.

There is a reason for all screw lenths in the manual. Someone (designer engineer) has already done the work for you. Just stick to the manual and you won't create problems.
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Old 05-23-2007, 12:08 PM   #8477
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Quote:
Originally Posted by evostyle
OK... I took some measurements concerning the back top motor mount screw bottoming out on the back lower motor mount screw.

Top Hex screw 12mm long (threads only)
Lock washer .7 thick
effective threaded screw lenth 11.3

Novarossi SCT above mount to bottom of mugen motor mount 18.4
Top Hex screw goes down 11.3 - 18.4 leaves 7.1 distance remaining in Mugen motor mount rear screw hole

Bottom screw lenth 8mm with concave washer installed leaves 6mm effective threaded lenth

6mm screw lenth - chassis thickness 1mm lets screw go in 5mm

7.1mm left in motor mount - 5mm leaves 2.1mm gap between screws (STOCK manual setup)

IF YOU USE a bottom screw that is 2MM (SJG3x10) longer you ONLY leave .1MM gap between the two screws. This could easily be closed up depending on how tight you tighten your screws. I would NOT suggest using LONGER screws on the rear TOP or BOTTOM screw of the motor mount.

There is a reason for all screw lenths in the manual. Someone (designer engineer) has already done the work for you. Just stick to the manual and you won't create problems.


Remember boys..... I race MTX3 and MTX4 ( on bi-monthly basis ) since 2004 and I never get stripped gears. I always finish the race 90% of the time ( the remaining 10% are tires problems : ex. bottom out, chipping, wear out faster than expected ). Yes.... I make the rear bulkheads area stronger than in manual said.

I say go ahead with SJG3x10 ( 2mm longer ) and they do fit.

0.1mm gap remaining ?? I don't believe that..... your thread holes has been partly FILLED with thread lock.

Engineers has done extensive research for you ??, yes, could be...... however, often the boss tells the engineers to keep the cost low ( eg. shorter screws means less weight for shipping or cheaper manufacturing cost ) and order them to make the cars strong BUT NOT that strong. Otherwise, customers are buying less spare parts because their cars are strong and less prone to breakage.
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Old 05-23-2007, 12:14 PM   #8478
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Quote:
Originally Posted by rmdhawaii
What is the significance of placing the piston in the middle when adjusting the gear mesh??

if at top or botton it will create movement on the crankshaft therefore affecting the gear meshing, you could say that at the middle is the standard position, try it and you will notice, and from then you{ll have a bell that has zero movement against the spurs still very tied.
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Old 05-23-2007, 12:19 PM   #8479
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Quote:
Originally Posted by Seisick
if at top or botton it will create movement on the crankshaft therefore affecting the gear meshing, you could say that at the middle is the standard position, try it and you will notice, and from then you{ll have a bell that has zero movement against the spurs still very tied.
I believe Mugen's Spur Gears are not perfectly round ( perfect circle ).

That's why when people rotate the pinion gears against the spur gears, they can notice the imperfections. Is this what are you trying to say seisick ?
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Old 05-23-2007, 01:19 PM   #8480
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Quote:
Originally Posted by Seisick
if at top or botton it will create movement on the crankshaft therefore affecting the gear meshing, you could say that at the middle is the standard position, try it and you will notice, and from then you{ll have a bell that has zero movement against the spurs still very tied.
Very interesting. I will try it and see if I can see the difference.

Thank you
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Old 05-23-2007, 03:16 PM   #8481
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Quote:
Originally Posted by asw7576
I believe Mugen's Spur Gears are not perfectly round ( perfect circle ).

That's why when people rotate the pinion gears against the spur gears, they can notice the imperfections. Is this what are you trying to say seisick ?

not exactly, this is what I found with the clutch bell, don;t know if it is the same with the new desing that is supposed to have two holes and less movement.
for instance, if you adjust your mesh when the piston is at top position, the spur vs pinions is perfect then the mesh is perfect, now rotate the crankshaft, you will notice that the pinions vs spur has is not that perfect as before due to the movement of the bell!
so what I do is place the piston at middle, and adjust the mesh so there is not movement of the pinion when you hold the spur, still it rotates very freely! yet when the piston is at top or bottom it still does.
I could say that all the guys at my track are lucky or perhaps I've assembled all their kits since I'm a dealer for mugen, don't know for sure, but on my track no mtx4 strips.
all the kits are stock versions, some with front unis, others with steel pinions
mine has titanium pillow balls and screws.
happy racing and hope it helps
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Old 05-23-2007, 07:53 PM   #8482
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Quote:
Originally Posted by asw7576
Hohoho...... I just bought two F8 bags too. 1 for Electric and another 1 for Nitro.

Compartments are like Boeing 747's belly. Each bag carries all my spare parts and tires.

The problem : Need big SUV to carry it.
I can fit mine in the back seat of my 2Dr Escort ZX2 along with a Mugen bag and the table and chair behind the two seats. The only downside is I can't lean the chairs back too far if I wanna take a snooze in my car when I take the 73mile hike back home..after being at the track for over 5hrs. After I check my expenses when I move out I may get a new vehicle...either a Chevy Impala or Dodge Caliber.
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Old 05-23-2007, 11:18 PM   #8483
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Quote:
Originally Posted by HarKonnenD
I can fit mine in the back seat of my 2Dr Escort ZX2 along with a Mugen bag and the table and chair behind the two seats. The only downside is I can't lean the chairs back too far if I wanna take a snooze in my car when I take the 73mile hike back home..after being at the track for over 5hrs. After I check my expenses when I move out I may get a new vehicle...either a Chevy Impala or Dodge Caliber.
73 miles home to track ?? Good luck buddy ...... and drive safely.

Chevy Impala maybe can carry two F8 and three friends
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Old 05-24-2007, 02:50 AM   #8484
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I've posted a draft help guide for the 2nd spur gear stripping problem in the MTX-4 KB. If you have any comments or suggestions on how to make it better, please let me know.

Thanks
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Old 05-24-2007, 03:15 AM   #8485
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Quote:
Originally Posted by rmdhawaii
I've posted a draft help guide for the 2nd spur gear stripping problem in the MTX-4 KB. If you have any comments or suggestions on how to make it better, please let me know.

Thanks
NO, WE THANK YOU !!!

I read the article , it's good stuffs.

Just a suggestion for your article. Pictures explain a thousand words.
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Old 05-24-2007, 03:35 AM   #8486
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Quote:
Originally Posted by asw7576
I believe Mugen's Spur Gears are not perfectly round ( perfect circle ).

That's why when people rotate the pinion gears against the spur gears, they can notice the imperfections. Is this what are you trying to say seisick ?

Last edited by Ghett0; 05-24-2007 at 04:57 PM.
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Old 05-24-2007, 03:55 AM   #8487
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Guys what about ppl over tightening the spur gear onto the 2 speed housing possibly causing it to deform?
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Old 05-24-2007, 05:08 AM   #8488
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I have my second MTX4 now and I bought a healthy supply of spur gears when I read all this here in the beginning, when the car just came out.

Fact is, I still run my original spur gears on both cars and they have plenty of miles on them.
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Old 05-24-2007, 10:28 AM   #8489
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i have a collari turbo 3-port motor in my mtx4 i'm new to the turbo plug world what is a good replacement plug to use? i have no clue what plug is in it since it's the original plug & collari website doesn't say much of anything.
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Old 05-24-2007, 11:41 AM   #8490
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FEMCA 2007

I need your blessing guys...... tommorow is my qualifying day
Attached Thumbnails
Mugen MTX-4-asw2.jpg   Mugen MTX-4-asw3.jpg   Mugen MTX-4-asw4.jpg  
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