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Engine Temp

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baldie

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My running temperature is usually around 200, and I'm sure teh weahter has somthing to do with it. Is this okay or do I need to raise the temp a little? I also just upgraded my cooling head so it might even go down a little more. I was told that the temp should be around 240.
 
What did you upgrade the cooling head to? In this kind of weather, you may need the stock head on there, because you need to be around 240. Do not go overly lean on the hsn, because that will ruin the engine if you do it for too long.
 
.21Rc10GT said:
What did you upgrade the cooling head to? In this kind of weather, you may need the stock head on there, because you need to be around 240. Do not go overly lean on the hsn, because that will ruin the engine if you do it for too long.
Click to expand...

I upgraded it to the golden horizens cooling head.
 
Yeah, well you need to get the temps to about 240 degrees, because running it too low can also make it wear out faster.
 
.21Rc10GT said:
Yeah, well you need to get the temps to about 240 degrees, because running it too low can also make it wear out faster.
Click to expand...

How would I do that....adjust the HSN?
 
Yes that is it. But adjust it in 1/16 increments. Drive it around and see if the performance changes. Also check the temps and make sure that there is a nice trail of blue smoke emitting from the pipe.
 
I would be leaning it 1/16 increments right? Is the HSN the needle the one thats gong to be adjusted more times than others because of the weather? I just finished my break in on sunday and adjusted all needles for performance. By adjusting the HSN to raise my temp a little, will I have to adjust the LSN and Idle needles as well???
 
In most cases the HSN is the only one you will need. That is the main needle that allows more fuel to get to the carb. THe LSN is just the fine tuning needle. The LSN mainly works to get you more low end acceleration. You may need to adjust it but IMO I only have had to move the LSN a few times but the HSN I would need to depending on the weather and such. IDLE screw you may have to readjust if you are moving all needles. Be careful. I say move one needle at a time and at 1/6 increments.
 
Okay...so this is how I see it....you adjust these for:

HSN - temp change
LSN - low end acceleration, timing of cut-off after pinching line
Idle - engine idle (lowest possible)

am I right??
 
LSN affects both the idle and low end take off. As you lean the LSN, idle temp goes up. I once tuned a guy's 2.5, and after getting it started, I let it idle just for a temp check. In barely 3 minutes of idling, it hit 310.
When the LSN and the idle are correct, that's when you adjust the HSN for midrange and WOT. Make several WOT runs and check temps again. Too lean will make it too hot. ALWAYS look for a trail of smoke. Trying to get it to temp on a cold day will starve it for lube, and often it needs to be richened to get performance on a colder day.
The idle shouldn't be as low as possible, but rather as high as possible. By that I mean, the higher the idle, the more stable it is, but you do NOT want it at a speed where it chatters the clutch or makes the car creep forward.
 
Well I had a starting issue today. It was working well on sunday. I started on the 2nd try. Got it going for a few minutes then it died during idling. It took me a few minutes again to get it started, got it going, then died on idle again. I richened/leaned the HSN slightly and it didnt' seem to correct the problem. I slightly adjusted the idle clockwise, and it also didn't seem to correct it. I gave up for the day because I coudldnt get it started. Not sure if this matters but I installed a fuel filter and a new cooling head. While it was running though, I was able to get some temp readings and the highest reading I was able to get was 200. The whole point of me running the car today was to get the temp up.

Hey rolex....can you help me out once again as to why my tmaxx is having a hard time to start today and it was working perfectly on sunday.
 
For starters, put in a fresh glow plug. A lot of them don't perform very well after running so rich during the break in.
You might also want to get a rechargable glow ignitor, and remove the blue wire to the plug. That way you don't run down the starter battery as quickly, and you know you have good current at the plug.
When the battery starts to fade, so does the heat at the glow plug.
 
i didnt know that running to rich will cause the engine to wear out faster i run about 200-215 and my engine has been through about 6 gallons of fuel every thing from odonells blue thunder trinity platnium and the traxxas stuff and i have topped out at around 37 mph no need to go faster where I live. and I get about 13 min to the gall
 
Rolex said:
LSN affects both the idle and low end take off. As you lean the LSN, idle temp goes up. I once tuned a guy's 2.5, and after getting it started, I let it idle just for a temp check. In barely 3 minutes of idling, it hit 310.
When the LSN and the idle are correct, that's when you adjust the HSN for midrange and WOT. Make several WOT runs and check temps again. Too lean will make it too hot. ALWAYS look for a trail of smoke. Trying to get it to temp on a cold day will starve it for lube, and often it needs to be richened to get performance on a colder day.
The idle shouldn't be as low as possible, but rather as high as possible. By that I mean, the higher the idle, the more stable it is, but you do NOT want it at a speed where it chatters the clutch or makes the car creep forward.
Click to expand...

So Rolex....I should lean the LSN to raise the temp? Don't adjust the HSN until the LSN raises the temp right?
 
It depends on outside temperature. You want 200 - 220 at idle, but not if it's cold out. Insulate the head if it's below 40.
If it's running good at take off, leaning it to get the temp us will only starve it for oil.
 
Rolex said:
It depends on outside temperature. You want 200 - 220 at idle, but not if it's cold out. Insulate the head if it's below 40.
If it's running good at take off, leaning it to get the temp us will only starve it for oil.
Click to expand...

Well temps right now are usually in the 50's-60's here in cali. So I dont I would need the sock suggestion right? Just lean out the HSN?
 

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