JC2133

i know the cooling head is supposed to dissipate heat from the motor. so i was curious if upgrading to a larger cooling head will help make my stock revo run better/keeping the temp down? i live in Arizona and usually when i want to bash around after i get off of work it's still around 105-110 outside. i was looking into a few cooling heads in tower hobbies and i found a few:
http://www3.towerhobbies.com/cgi-bin...&I=LXEMN8&P=ML

http://www3.towerhobbies.com/cgi-bin...?&I=LXPXU0&P=7

Any thoughts or suggestions???
thanks,

sfar785

i was having cooling issues with my Revo, i switched to 20% fuel to keep the heat down, it gets to around 100* up here in Colorado AND we have thin air.

superman11

My Feedback: (1)

I recently bought a Nova cooling head for my TRX 2.5 I have not yet had a chance to run it but it looks freakin' sweet!

matts6887

I would say yes on the cooling head to keeping the heat down, but, switching to a fuel with more oil content could also help as well..

JC2133

matt-would you agree that switching to 20% fuel would help?
superman-where'd you pick up your nova cooling head? i've read on a few sites that nova is the perfect choice.

cmerritt

here is NOVA's site http://www.novarcproducts.com

iamnot

i say no on the cooling head
too easy to get a lean engine and artificially normal temp

if you want to cool the engine more during the summer try installing a computer fan blowing on the head
ask beer=food, i believe he has done that mod w/ good results

and going from 30% to 20% nitro content fuel will lower engine temps a little
but
anything over a 10%-12% oil content will not, repeat - not - lower engine temps
in fact, too high an oil content will actually start to raise the temps

ratpower396

american cnc makes nice big aluminum heads..sorry i dont have a link

matts6887

Yes I would agree because switching will help to lower the temps a bit because u are providing the engine with more lubrication, in turn helping to cool the temps at least somewhat anyway....

superman11

My Feedback: (1)

JC I got mine from 2coolrc.com, but I dont recemend buying anything from them it took a month to get it to me with the worst costumer service I have ever seen. They are really easy to find on ebay as well...

Mspeed

I have done the computer fan route and it works the best in my opinnion for controling temps. The cooling head can work too if you learn how to control temps with wraping the head during the cooler days or later in the evening when it cools down outside. These nitro motors provide their best performance at a certain window of temps. Even if your tunning is right on, if your not at that optimal temp window, your motor will not loosen up to the point were it provides the best performance and does the least wear and tear.

I like the fan cause you still use your stock head for cooler days plus you get to dial in your temp by controling fan speed. Its acctually pretty simple to run a fan off your reciever pack or just run off a extra set of 2-3 AAA rechargable batterys. Just make sure you get the right fan.

As for higher oil content, it can cause it to run hotter. I have seen it for myself. Just depends what oil content were talking about. Seems 12% oil is around the sweet spot for these nitro motors give or take a few.

If you decide to do the fan I can give you some tips on what the better fans are to get and how to set it up.

JC2133

yeah can you give me a setup on how to run the fan...thanks

DaveG55

Switching to 20% - from say, 30% lowers temps because it has less nitromethane and so burns cooler. It has nothing to do with more or less lubrication. As has been stated twice now, more oil can actually raise operating temps. Besides simply changing the nitro percentage in the fuel does not necessarally change the amount of oil getting to the engine.

t-maxxmaniac

why would more oil raise the temps? more lube means ur pistons gettin more oil and its gona stay cooler

DaveG55

That would certainly be the normal assumption. But in nitro engines where the nitro and the fuel burn at different rates, too much oil will mean that not all of the oil burns off, you want it to burn off as much as possible in the combustion chamber as the oil is only helpful around moving parts. But since it does not all burn off it tends to retain heat, thus raising the overall heat level of the engine.
I'm sorry that I don't do the explaination justice. There's an article floating around that does a much better job of explaining it than I do. But you can believe it's true, people have done tests to prove it. And others, like MSpeed, have found it to be true in practice.

danja mon

If you have an old one of those air hogs indoor helicopters you can use the tail rotor with the motor from the main prop, get a "Y" connection and plug it in with your 2060 reverse servo and use it to throw the switch for your new fan on and off. And it's small enough to mount under the roll hoop,...works better than I thought it would!

twomanytoys

Like stated above installing an aftermarket cooling head only masks a problem and can make matters worse. Anything over 12% oil is overkill. Just because it has higher oil does not mean better lubrication. Oil does burn at a higher temp and also oil burns hotter. Too much oil will make it run hotter.

JC2133

since my neighbor has some 20% fuel, i'll go ahead and try that first before buying a cooling head. after doing a little more research on some other sites...some have also said that a cooling head will mask the "true" temperature. although some have swapped it out w/ success. so it just comes down to how good you tune the motor, as some of you have stated. so again, i'll try switching the fuel up...and i guess a temp gun wouldn't hurt [&:] and i'll try to get tuned as best as i can, and i'll see what happens. by the way...anyone know what the normal temp should be?

iamnot

most nitro engines have a normal operating range of about 220 - 270 degrees
i think that traxxas says that optimum for the 2.5 and 3.3 is 245

however, don't tune by chasing a temp
tune to performance, sound and smoke
and use the temp gun as a check to verify that you're where you need to be.

nissanlove

where exactly do u take the temp? the block i would guess but im not sure

superman11

My Feedback: (1)

Right at the glow plug aim the thing right down the hole...

basherjordan

put the temp gun right over the top of the cooling head. aim it, like at the glow plug.

matts6887

+1 here!!! definitely!!!! [8D]

nissanlove

i got a pyrometer on my voltmeter and it reads 207 on my os 18 so i could lean it out right?

beer=food

Wanna cheaper way of cooling it, get a PC , CPU heat sink and screw it to the TRX head heatsink, instantly you have doubled the surface area and sped the cooling process up, but most TRX engines just dont need it.l have a 4.6 that used to run hot, no matter the tune, so l did that and its run awsome ever since.