justin125

my tmaxx is running perfectly but it overheats and causes it to shut off. it is
properlt tuned and runs great with lots of power but what should i do? do u think i need a new colling head?[]ive tried different glow plugs and every thing u can think of plz help with this
tell me if i need to buy something or turn a few screws plz.



thank u in advance.

jokerplaya

is there any blue smoke?

jokerplaya

here's a list ofpossible cause other than the fact you might have a bad engine... dirty air filter(clean with dish soap thoughly rinse then put in air filter oil) ,air leak(check fuel lines gast tank o ring fuel filter o rings head screws carb pinch bolt carb o ring header screws

jokerplaya

but if theres no blue smoke then u need to richen the hsn most likly its not tuned properly but u need to check every thing else to

DaveG55

If it is overheating and shutting off it is, by definition, NOT running perfectly.
You say it is tuned properly, I'll bet it's not. It sounds like you're running way too lean on the hsn. Probably the lsn too.
You could also have an air leak contributing to the overheating.
DO NOT buy a new cooling head until you figure out why the engine is overheating. A new, more efficent cooling head will only mask your problem and in all likelyhood cause you to destroy your engine.

justin125

yes it is tunedproperly with with blue smoke ive had many people lok at it and say its fine.
i do want to get a new coolin head but i cant afford. plz some body just throw mw a big list of possible reasons plz thanks in advance...

DaveG55

Overheating is almost always caused one thing.
Running lean.
Running lean is almost always caused by one of two things.
#1 - an air leak and people have already told you where to look and what to do for that.
#2 - Improper tuning but hey, that's perfect, right?

The only other things I can think of off hand are
Constant running in very tall grass or loose sand, Something causing extra drag on the engine - like, say, a broken clutch and running fuel with a very high oil content (above 16%).

I'll say again, you're probably tuned too lean and you probably have an air leak and don't get a new head before you fix this problem or you will ruin this engine.
Good Luck.

rawkfist2

Its not tuned right. Richen ur HSN.

truckin321

Don't feel bad, have had the same problem since it was new and that was 4.5 gallons ago. Mine does it after a few wide open passes. What is your engine temp, mine is over 325 degress [with plenty of blue smoke] when it quits. I just run the truck in a smaller area and limit the WOT and all is fine. Quit a few peaple have tried a lot of different things to the truck,copper ATV, different fuel tank, changed the lines,changed carb and incredible amount of retuning but it never changed. We even tried without the body and it still does it so in my opinion you will have to change your driving habits or buy a different motor. Good luck!

justin125

yes sometimes i run it through tall grass and do some fast passes mabey that is why.
thank you all for your help and i will keep you posted with all your ideas and tell you how they work! again thank you for your help!

dan1970

and from what I know about nitro engines, Smoke doesn't tell you squat. Some fuels smoke more than others depending on amount of oil in them. So don't gauge your engine on whether there is blue smoke or not.

Dan

Indecline099

run it without the body

KILL--ROY

My 2.5 did the same thing, it is the cooling head it is to small. I got a larger cooling head and it ran great. The 2.5 is a high performance motor traxxas made a flaw with the the small head. It needs a head like is on the 3.3 now. If yopu look at the 2.5 and how it sealed up with the 0 rings I doubt it is a air leak it is one of the best sealed motors I have seen.

DaveG55

Odd, neither of mine overheat when they're tuned properly.
But do whatever you want. It's your motor and your money.