fitting new motors - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-28-2009, 07:50 AM   #1
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Talking fitting new motors

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This may be a really dumb question....however ....
Will any motor fit any car?
I know that sounds pretty generic...
Lets say, i want to put a new motor in my Revo 3.3......
Does it matter what engine i get...(keeping in mind if i want a .21 .28 etc)
What do i need to be aware of...
Quite in the dark on this one
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Old 04-28-2009, 08:11 AM   #2
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For the most part, any motor will fit in any chassis. That being said, it is within the limitations of the car you are using. If you are trying to fit a crazy huge motor in the car then you will likely have to do some modification. If you're going from a .21 to a .28 I dont see why you would have much of an issue.

If you are a racer, you will probably want to use a .21 for the fuel milage advantage. It will have less torque than a .28 but it will be better for racing applications. A good motor to consider for racing would be a Reedy 121VR. The power band is great, it is super reliable, and has unreal fuel milage. If bashing is your thing, who doesn't want to have the torque to be able to do wheel stands right?

Hope it helps,
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Old 04-28-2009, 11:00 AM   #3
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Generally what Steve says is true, however when dealing with a monster truck, and in your case, the revo, you cannot just dump in any engine you want. The 3.3 I believe is considered a small block engine, and the .21-.28 series motors are big blocks. You will need to buy a big block conversion kit for your revo, either that or buy an engine made for the monster trucks like the OS series of TM engines or RB Traxxas monster series of engines.
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Old 04-30-2009, 10:41 AM   #4
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The revo takes a mid block motor and it is hard to fit a true big block into it. Not to mention that a 28 would tear the stock drive train to pieces as it was not designed for that kind of power. You would have to likely look at robinson transmission gears and hardended CVD's all around to get some reliability out of it.

The simplest solution is to buy a mid block motor kit that bolts right in. The options available are the OS 21tm, Picco 26, Sirio 23 and RB Concepts 523. All of them a serious power improvment over the 3.3, but not to the point where they tear your drivetrain apart. But, more power will always equall more wear and tear on some parts.
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