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Old 01-19-2011, 01:06 PM   #1
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Cool How loud should my car be?

ive got an mi4 but the motors pretty knackered and i think its gonna pack in soon( im getting a new motor ) but it seems to be quite loud, much louder than my tt01 but this is my first racing chassis and my first beltdrive car and i want to know if ths is normal, it sounds like it comes from the spur and diffs
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Old 01-19-2011, 01:13 PM   #2
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Originally Posted by Schumacher MI4 View Post
ive got an mi4 but the motors pretty knackered and i think its gonna pack in soon( im getting a new motor ) but it seems to be quite loud, much louder than my tt01 but this is my first racing chassis and my first beltdrive car and i want to know if ths is normal, it sounds like it comes from the spur and diffs
Before you blow it up or grind the diff/spur, check to make sure they are moving freely without the motor on, when checked and done, your car should sound quite silent, check any vids on youtube so that it gives you an idea
Its down to gear mesh, whats dp are you using ?
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Old 01-19-2011, 01:34 PM   #3
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Quote:
Originally Posted by Schumacher MI4 View Post
ive got an mi4 but the motors pretty knackered and i think its gonna pack in soon( im getting a new motor ) but it seems to be quite loud, much louder than my tt01 but this is my first racing chassis and my first beltdrive car and i want to know if ths is normal, it sounds like it comes from the spur and diffs
Not sure if the transmission on the MI4 Is the same as the MI4LP but when I built mine it started to make a bit of noise at full power, it turn out to be the grub screw on the pinion gear just catching the main drive belt. But as said above make sure it runs freely with no motor in as they should run fairly quiet.
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Old 01-19-2011, 01:38 PM   #4
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Could well be a tight spur/pinion mesh. There should be a little play between the two.
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Old 01-19-2011, 01:38 PM   #5
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Should just hear the whine from the motor, maybe the rattling of the body as you drive.
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Old 01-19-2011, 01:46 PM   #6
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thanks just loosened the mesh and its fine
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Old 01-19-2011, 02:00 PM   #7
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Be sure to double check your mesh when you get your new motor or you'll "pack it in" prematurely too...
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Old 01-19-2011, 02:10 PM   #8
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Belt cars should be quieter than a shaft cars. Like Phatkat said, you should only hear the pitch of the motor and not much else.
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Old 01-19-2011, 03:40 PM   #9
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Do this; cut strips of notebook paper(or any paper that is .002"-.005" thick) 1"-1.5" long and the width of a pinion. Stick 'em in your toolbox where they won't get all jacked up; a 35mm film can will do nicely. When you set mesh, put one between the spur and pinion, push 'em together to crinkle the paper(don't do it so hard that they cut the paper), then tighten the motor screws. Pull out the paper, and presto! Set mesh.

I did it that way for a while, then I just got good at doing it by feel. By feel, there should be just a tick(literally) between the gears. Also, rotate the spur to at least 4 different positions to check, as the spur can bend, go oblong, or otherwise be out-of-round. If it's too tight in one spot, try a new or different spur, or check the shaft and bearing it's on.
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Old 01-19-2011, 03:50 PM   #10
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To add: Look over your gears for wear and damage regularly and often. Worn gears, even when set right, are louder, and don't sound "right". Look at the profile of the teeth, they should be symmetrical.


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Old 01-19-2011, 04:07 PM   #11
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Worn gears is a good point, check for any missing teeth. Just one missing tooth (even when its only 1 in 80) will make the car sound like a bag of nails.
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Old 01-19-2011, 06:18 PM   #12
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Quote:
Originally Posted by Schumacher MI4 View Post
ive got an mi4 but the motors pretty knackered and i think its gonna pack in soon( im getting a new motor ) but it seems to be quite loud, much louder than my tt01 but this is my first racing chassis and my first beltdrive car and i want to know if ths is normal, it sounds like it comes from the spur and diffs
sounds like your from the UK?
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Old 01-20-2011, 09:58 AM   #13
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ye im from uk
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