Temperature questions The absolutes, and tuning.

[lykan]

Ok, most of you know I'm a little new to the nitro scene. I've got the tuning thing down. I can make it do what I want.

That parts pretty easy. The problem is I don't know the boundaries.

How hot is too hot? I mean for a .15 motor what's upper limit. Were do you absolutely not want the temperature to peak at? 280? 290? If I'm getting a pretty good temp of around 260-270, just plugging around, then I hit it really hard (love to roost), where is it not supposed to go 300, 310? Is that temp ok for a spike, or should it never go that high?

Then again, where's the low point. Say I tune it so I get a maximum temp of 260. When I just idle around and putt about, how warm should I be keeping it?

So what's the no go temp for running? What's the No-go temp for a spike? I'm kind of worried I am leaning the LSV and richening up the HSV to cover it, and or vise versa.

I also have a question about sitting at idle. Almost instantly a fine mist with a few bigger specks appear on the ground below the pipe. Does this mean my LSV is a tad too rich?


BTW I really like the power Trinity 20% / 12% oil gives me, but I do not like the heat, or the smoke/lube my engines getting.

I realize my old mach .15 was a tired engine, but I don’t think it should have failed on me so soon after a rebuild. I also know that every engine is different. I'm not asking for a perfect tune temp for my engine, just some decent limits.

 

[kwong2001]

Originally posted by lykan
How hot is too hot? I mean for a .15 motor what's upper limit. Were do you absolutely not want the temperature to peak at? 280? 290? If I'm getting a pretty good temp of around 260-270, just plugging around, then I hit it really hard (love to roost), where is it not supposed to go 300, 310? Is that temp ok for a spike, or should it never go that high?

Generally, anywhere in the 190-260 range is good, depending on the engine. My 8 port wouldn't run below 260. While my novarossi really doesn't go above 220. It depends on the engine. If you're close to 300, either your tuning is WAY off, or you have a serious air leak.

Then again, where's the low point. Say I tune it so I get a maximum temp of 260. When I just idle around and putt about, how warm should I be keeping it?

Again, that would depend on the engine. I don't know if it's fair to judge an engine's tune by the temperature at idle. There's no cooling, so your chances of experiencing rather high temperatures are more than if you're driving around.

So what's the no go temp for running? What's the No-go temp for a spike? I'm kind of worried I am leaning the LSV and richening up the HSV to cover it, and or vise versa.

huh?

I also have a question about sitting at idle. Almost instantly a fine mist with a few bigger specks appear on the ground below the pipe. Does this mean my LSV is a tad too rich?

That's usually a sign of running rich on the low end. Basically the engine isn't burning all the fuel going into the engine. You might have it tuned perfectly, but experience a little drip or two every now and then. My novarossi will do that


BTW I really like the power Trinity 20% / 12% oil gives me, but I do not like the heat, or the smoke/lube my engines getting.
Blue thunder makes a "sport" formula fuel with extra lubrication for added protection and longevity

I realize my old mach .15 was a tired engine, but I don’t think it should have failed on me so soon after a rebuild. I also know that every engine is different. I'm not asking for a perfect tune temp for my engine, just some decent limits.

Hope i've helped you a little

 

[Scapegoat]

Some engines run hotter than others. I had an old traxxas pro15 that only ran good when it was smokin hot. other engines run cooler. try to keep them below 300 max and above 230. more or less and you'll see alot of perfomance loss. Tune it so it's max temp is reached near the end of a tank, deal with it at full tank.

 

[StaticSag]

If it helps any I ran my mach .15 with good results at around 220-225 after a 5 minute hard run. I too fell victim to runnin that engine too hot....aroud 260....and had to prematurely rebuild the engine.

Tune the HSN 1st then tune the LSN by doing the pinch test. Do a search for pinch test for instructions onhow to perform the task. Peeps here could explain it better than I could.

Hope it helps but YES I believe anything above 260 is too hot for that engine.

Hope that helps


-Sag

 

[lykan]

The mach IO had took a dive on me quickly I'm now running a fairly sron trx .15 I dont want it to fail either. Maybe I'm expecting too much out of a .15
I am also wondering if having the slipper down tight(steel spur), and being stock and heavy puts an excessive load on the motor at take off.

 

[Çh®i§tiªñ]

Hitting 310 by virtue of a SPIKE in temp is ok in my book. I have a Mugen that runs solid at 270-290 but occasionally (after holding the hammer for a couple o minutes) will peak at 310-320. It just seems to be the engines sweet spot.

As for companies like O.S., I sent them mail back in the day for a CVX Hyper that wouldnt run worth a poop unless it were at 320 steady. They said that was perfectly normal and to run with it. The mill is still kicking around today.

Some mills just run hot and some run cold. To keep below a STEADY running temp of 300 is wisely advised. But to hit temps of 310-320 is not out of the norm when under long heavy load.

 

[NooP]

my cars all do the same thing. Ill tune them for 250. Then when I rip the car hard for a minute or two or longer, ill bring it in that its blazing hot. sometimes in the low 300 range. Then I just drive it around in circles for a bit just to get some fresh air flowing to the head and it cools right back down. I've gone through 2 gallons between 3 cars and none of the the engines seem to be hurt yet.

--NooP

 

[Bill Hoskinson]

Big Blocks- 180-250
Small Blocks- 220-270

The heavier the chassis the engine is in, the hotter it will run, and visa versa.

Gearing plays a major role in engine temps also. Gearing an engine too steep and over revving it for the area you are running it in, will cause engine temps to be high, and the same thing goes for gearing one too tall, causing the engine to Bogg....

Incorrect clutch stall speeds also tend to cause problems also....

Too low of a stall speed in the clutch tends to kill acceleration, and most people try to tune thier way out of that by leaning the LSN too far.