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Old 06-04-2006, 05:33 AM   #1
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Default Engine Overheating - Change of wheel Size?


I recently changed my wheels from a 1:10 to a 1:8 - I'm running a Tamiya Nitro Thunder. Prior to changing the wheels my car seems fine but after i've changed it i notice my engine heats up very quickly after a short run, at one point there was a small puff of smoke too (luckily my engine is still alive!) - it went up to 90 degrees C.

My question is, is my problem caused by my gears? I havent changed my driven gear thus making the engine spin harder to push the larger wheels (since the wheels are now bigger). the hobby shop guy suggest i should change the driven gear so its better suited for the larger wheels, but didnt say it will over heat my engine.... ?!? whats your call guys. thanks for any advice

p.s new wheels are definetely worth it! heaps better steering but doesnt cover a smoked engine!
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Old 06-04-2006, 06:52 AM   #2
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bigger tires will stress more than just your engine...

they stress your drivetrain, suspension, basically the entire car.....

yes you need to regear your car for the bigger tires.....
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Old 06-04-2006, 06:57 AM   #3
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will this damage my car permanently if i continue using it say for another tank or two.
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Old 06-04-2006, 09:19 AM   #4
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no damage is permanent, you can rebuild things, but it is not good to put on bigger tires unless you re-gear the car. I don't know if you can re-gear low enough to get the right ratio you need. If you are to continue to use bigger tires, go and get the smallest clutchbell and largest spur gear you can get for your car.
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Old 06-04-2006, 05:00 PM   #5
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90 degrees Celsius? Isn't 100 degrees C = 212 degrees F.?

90* C isn't anything to worry about.
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Old 06-05-2006, 02:02 AM   #6
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actually most say that if you arent somewhere in that ballpark you are causing premature wear on your engine...

also is the better steering response due to the decreased throttle response due to overgearing or is it the higher ride height...
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Old 06-05-2006, 09:32 PM   #7
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My wheels were worn out before i got these wheels, but regardless - the bigger wheels definetely gives me better steering - not sure if it has to do with the height (i havent lowered it). I will take it out for a spin in the tracks and see if it will flip, if it doesnt i will probably keep it that way.

in regards to the temperature, i concerned because i saw smoke coming out..... i not sure if this was caused by burning leaves (caught in the engine) but the smoke was obvious....
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