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Old 06-18-2006, 05:10 AM   #1
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Default Engine refuses to start when its warm ~ HELP!

Hi,

i'm runing a tamiya nitro thunder with a 15 engine, myself and another driver have the same car and we both experience the same problem.

Engine refuses to start after a full tank, temperature considered normal 80 degress. It seems there is no compression in the engine, as if the heat is pushing the fuel out (even if your pumping it in) - tried priming it but still doesnt help.

Once it cools down the engine starts flawlessly, however you cant really race if your engine refuses to give you more than one tank's run.

Any suggestion guys/girls? thanks
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Old 06-18-2006, 08:02 AM   #2
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thats your problem...your motor has no compression. Time for a new one!
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Old 06-19-2006, 03:03 AM   #3
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its only 2 months old and driven a couple of times only.
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Old 06-19-2006, 08:41 AM   #4
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I run into this problem on my 1/8th motor. The problem could be that the carb is hot, which is vaporizing the fuel right near the carb inlet and causing a vapor lock.


I'm not sure what to do to cure that problem though.
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Old 06-19-2006, 09:31 AM   #5
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Like both guys have said, the problem is either:

1. Poor compression means its worn out. Does not matter how long you've had it, you can ruin compression many ways quickly.

2. Carb getting hot, one solution is to be sure you are tuning it cool enough. This used to be common on older engines, but with the new technologies its not so common.

How does it perform when hot...you can re-fuel while the car is running...thus removing the need to shut it down and re-start it hot.
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Old 06-19-2006, 09:33 AM   #6
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Sometimes, this can be a signal of an air leak- either in the tank, fuel lines, carburetor, or pressure fitting. Basically, air is getting into the carburetor from some source, leaning the mixture and overheating the engine. This may make it hard to start. The "No compression" feel you're getting is due to the engine being so hot- The sleeve has expanded quite a bit.

Check that your tank and fuel lines have no leaks, be sure that the screws on the head of the motor are tight, and make sure no air is leaking into the carburetor- and make sure that your pressure line is connected to the tank and pipe.

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Old 06-22-2006, 04:26 AM   #7
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i've given up on this car and brought a new one instead... the parts are poorely made, mostly plastic....

the engine are no way overheat, usually only reaching around 80-90 degress. which is considered normal by most.

in terms of having air leak.. i will check the cables but it doesnt appear to be the case either. i'm not sure... its a confusing one
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Old 06-22-2006, 05:58 AM   #8
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80-90 is cold, unless you are speaking in Celcius, then it places it around 176-196, which is ok, but still a tad cool in my opinion.
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Old 06-24-2006, 10:15 AM   #9
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Quote:
Originally Posted by Aceboy
i've given up on this car and brought a new one instead... the parts are poorely made, mostly plastic....

the engine are no way overheat, usually only reaching around 80-90 degress. which is considered normal by most.

in terms of having air leak.. i will check the cables but it doesnt appear to be the case either. i'm not sure... its a confusing one
Giving up the whole car because you can't get the engine just right? Boy, that was a smart move.

This will end up being a VERY EXPENSIVE hobby for you if you give up and but another car when you can't get one just right........
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Old 06-25-2006, 05:04 AM   #10
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Quote:
Originally Posted by SavageSYNTH25
Giving up the whole car because you can't get the engine just right? Boy, that was a smart move.

This will end up being a VERY EXPENSIVE hobby for you if you give up and but another car when you can't get one just right........
given the lack of parts support and the problem with the engine, i will consider this an expensive lesson.
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Old 06-25-2006, 07:13 AM   #11
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so what did you replace it with?
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Old 06-26-2006, 04:03 AM   #12
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brought a hyper 7 - pbs mach 28
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Old 06-30-2006, 02:16 AM   #13
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hi all, just a quick question when we are talking about normal operating temperature of about 230 degrees - thats celcius or F?
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Old 06-30-2006, 03:15 AM   #14
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engines ggggggoooooooooooooooooooooonnnnnnnnneeeeeesssssss kkkkkkkkkiiiiiiiiiiiiiiiiiiiisssssssssss lol

sorry bout the long post
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Old 06-30-2006, 08:56 AM   #15
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230 Fahrenheit is what they're referring to.

230 Celsius would be.....very, very bad. hehehe
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