Nitro Engine temperature

[cayman]

Dear all,

I have a X-factor with XTM 24.7 engine. During the first few minutes break-in process, the measured tempearture (at the glow plug) is 240 degree F. I shut down the engine immedinately because I afraid that this high temperature will kill my engine.

So what temperature range should be ok during the break-in process? Is this temperature range also applied to the engine after break-in (play on the road)?

Thanks all your help in advance. :idea:

 

[Rolex]

200 to about 220 during break in. After break in, start to lean it a little for each tank till normal running is about 280.

 

[psunitro]

Yeah,you want to keep it atleast 200 ,needed for break in. 200-240 is a good range. If you do a search for break in there are good tips on the threads. From everything I have read/heard thee 24/7 is a great mill!

 

[olds97_lss]

280 rolex! That's sounds kind of high...

I run all my engines between 210 and 250. 240 is kind of high for your second tank. I'd richen it up some.

 

[Lessen]

I never seemed to get any more performance gain above 250 on my old TRX 2.5

 

[Rolex]

Not 280 for break in, he asked about temps AFTER break in.
After you last break in tank you should be at 240, then lean it just slightly each tank thereafter till you reach the optimum temp of 280.
Some engines run very well at 260, and some won't really give you performance till almost 300, but 280 is a safe spot.

 

[olds97_lss]

I guess we will agree to dis-agree... I never run that hot with any engine and when I do, performance really suffers. Anything over 270 for me gives me crappy performance and instability in running with flameouts.

Granted, I've only broken in and ran about 12 engines in my life, but out of all of those, anything much over 260 proved to be bad for performance.

 

[Rolex]

I never seemed to get any more performance gain above 250 on my old TRX 2.5

There are a lot of 2.5s at the track, and only ONE of them runs well at 260. All the rest are 280-290. Less than that and the RPMs slow down.
Olds, I'm not sure about the 24.7. He'll have to find out. I know some of the bigger engines run well around 240, and others want 305.
It all comes down to performance, after break in. Good low end, good WOT, good consistant sound, and a trail of smoke.
The temp is just the final check.
Don't be looking for great performance during break in. Take your time and do it right. Proper break in will give you a dependable long lasting engine.

 

[cayman]

Thank-you so much for all your relpy. It is very useful for a new beginner.

cheers,

 

[Plaidfish]

There are a lot of 2.5s at the track, and only ONE of them runs well at 260. All the rest are 280-290. Less than that and the RPMs slow down.
Olds, I'm not sure about the 24.7. He'll have to find out. I know some of the bigger engines run well around 240, and others want 305.

260 is too high for a 2.5 from my experience....mine always started to fade at 280....305 would have killed it real quick.....I try to never let mine get over 280 except a non turbo fantom (red head)......what engines do you run Rolex?
and is it very humid where U live?....I do run my bottom end real fat so if I idle for 10 secs I stall...I find that not only helps w/ keeping WOT temps low I also tend to get twice the amount of fuel through my engines as most guys...it's more of a pain cause I stall out more but at least my engines last.....

 

[Rolex]

At 260 they just start to come alive. I'm also referring to summertime, when it's really hot and humid. There's a very noticable increase in RPM when they get around 280. That's the max. Anything above that, and they get retuned.
It seems anytime a 2.5 is REALLY outrunning the others, it's running hot.
Even the LHS said 285 is peak performance. Mine is on its 3rd gallon, and still running really strong.

 

[vbgagnon]

On my 24.7 it seems to run best at about 235 - 245. Any more then that is grounds for a premature death. This is a great engine and temps in that range the engine is awsome. No need to lean it out anymore.

 

[Rolex]

Good point, vbgagnon. I haven't even seen one of those engines at the track yet. Most of the guys there are running Tmaxxs, Revos and stadium trucks. Traxxas, mostly, and a couple of Savages.
I'll leave the rest of the info to you, rather than cause confusion here with 2.5s. cayman, listen to vbgagnon. The info I was giving does not apply to your engine.