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Going crazy - acceleration issue

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Going crazy - acceleration issue

Old 05-04-2010, 03:00 PM
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zisman
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Default Going crazy - acceleration issue

Hi
I got robitronic mantis
With axial 28 1s engine
I also recommend this car to my friend and he also got one , and we run theme together .
Recently after a fix in the engine mount the car start to act different and I can tell that because we ruining 2 mantis so I can see the different really clear .
The car is tuning well the engine sounds good but it's not accelerate imidiatlly and she become heavy the engine is sounds ok but she is not moving fast , it's feels like the engine is turning the gears but the gears don't move the car .
I don't know to much about gearing or clutch but I have the feeling is the reason for it to be so clumsy and heavy .


How can I tell if it's the clutch or the gear ? Or maybe my engine is dead ?


Thx

Any tip will help
Old 05-04-2010, 04:41 PM
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SyCo_VeNoM
 
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Default RE: Going crazy - acceleration issue

sounds like the clutch or the engine mesh is to tight.

I'd check the engines mesh first.

To check the clutch take the engine out and take the clutch bell off. The shoes might be worn and not catching as well as before.
Seeing the clutch shoes are relatively cheap this woud be the best bet to try after making sure the engines mesh is ok.
Old 05-04-2010, 05:18 PM
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Default RE: Going crazy - acceleration issue

On my to replace it
Old 05-04-2010, 05:19 PM
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zisman
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Default RE: Going crazy - acceleration issue

Any preference with what I choose ?
Some are faster than other
What's the size that feet my motor ?

Thx
Old 05-04-2010, 05:26 PM
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zisman
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Default RE: Going crazy - acceleration issue

And about the clutch bell , what's the different from 15t to 13 t .
Shoul I change the clutch bell or shoe ?
Old 05-04-2010, 08:23 PM
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Default RE: Going crazy - acceleration issue

look inside the bell, if its all damaged and has grooves replace it. if the shoes are melted, thin or damaged replace them.

also make sure all your drive shafts are tight from the front and rear differential.

zisman, not to offend you, but are you using a translator?
Old 05-04-2010, 09:05 PM
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zisman
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Default RE: Going crazy - acceleration issue

Lol
I don't use translator , but the most important is that everyone underStand me
Chhhhh
I will do my best
Thx for the advice
But I just pull out my engine and the screw that hold the bell and clutch is dead , I would have to do a big dig into it in order to open it , but I think I have the Right tool for it


*sorry about my English it's only 3 years since I am using this language

Thx guys
Old 05-05-2010, 12:19 AM
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Default RE: Going crazy - acceleration issue

Check that the brakes aren't sticking: it's very common with this truggy. This is probably why your clutch assembly is showing signs of wear.
The engine will sound like it's under load (because it is) and the car will go very slow or not at all. If you look in the Mantis thread, you can see a simple fix I used to take care of this problem. Basically, you need to install a return spring for the braking system.
I've included a picture for you.
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Old 05-05-2010, 12:53 PM
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zisman
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Default RE: Going crazy - acceleration issue

so now i dont know what to change
the rear diff
the breaks
or the clutch

how can i check wich one of theme is making the trouble ?
Old 05-05-2010, 04:20 PM
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Default RE: Going crazy - acceleration issue

roll the car with the radio on and engine off, are the breaks dragging? if they are, adjust them so they dont.

once you do that, remove your engine by taking out the blots on the bottom of the chassis (should be four) remove the screw that is on the front of the engine.

look at the bell, if its all ground up and grooved, replace it, replace your clutch shoes regardless since they are cheap. they are bad if they are melted, thin, or broken.

then put everything back together using some blue thread locker (from hobby shop for $5).
Old 05-06-2010, 01:19 PM
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zisman
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Default RE: Going crazy - acceleration issue

Breaks r fine
Clutch is dead so I am replacing it today
I will run it with new clutch and see if that was it , if not inam thinking about the rear diff as mantion before .
Old 05-07-2010, 09:38 PM
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zisman
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Default RE: Going crazy - acceleration issue

fixed the clutch
its helping but its not that
i think that the rear diff is the problame
and also i found out my rear shaft and right fron wheel shaft are bend .
but the main thing is the rear diff since when i am holding it up in the air i can tell that the fron weel are spinning really fast and the rear are barely moving .
i think i will start from there

by the way any one one to buy it
just kidding first i need to see it drive well
Old 05-08-2010, 04:49 PM
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zisman
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Default RE: Going crazy - acceleration issue

WE GOT A WINNER !!!!
FOUND IT

1 of the 4 small gears inside the rear diff gear (the small bevel gear), was totally smashed
[img][/img]
Old 05-08-2010, 04:52 PM
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zisman
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Default RE: Going crazy - acceleration issue

WE GOT A WINNER !!!!
FOUND IT

1 of the 4 small gears inside the rear diff gear (the small bevel gear), was totally smashed




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Old 05-09-2010, 09:54 AM
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Default RE: Going crazy - acceleration issue

Glad you finally found it!

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