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Old 08-31-2010, 11:49 AM   #1
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Default How HOT is too hot?

Can someone tell me the recommended temp range for the new CC/Neu 1518 1800kv motor? I'm running on our local track (Fairfield OH) for ~ 10 min runs of great racing. The car is a converted 1/8 IGT2 with 4S2P 7600mah bats. The gearing is 26/46 and 30/43 for second gear. Top speed is in the 70mph range but she's very tame using 50% expo when burning up the track.
Right now temps seem to peak at 155 deg after 7-10 min of racing (ambient temps are 80-95 deg). Thanks in advance.
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Old 08-31-2010, 12:20 PM   #2
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That's fine. Most people gear for about 165 degrees.
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Old 08-31-2010, 12:59 PM   #3
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Thanks. That's what I was needing to know.
So now another question. I measured my tire temps after a 10 min run (mild), and noticed that the left rear tire seems to run ~ 15-20 deg hotter than the othe three (132 vs 114). Is this indicative of anything other than weight bias (motor is on left rean but I run two 4s packs that sit on both sides of the frame)?
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Old 08-31-2010, 01:14 PM   #4
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Not my area of expertise, but I wouldn't worry about it. Chances are you are correct and it has to do with weight distribution. If you aren't seeing a performance difference don't worry about it.
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Old 08-31-2010, 02:42 PM   #5
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If the circuit you race around is clockwise then I would expect there are more right hand corners than left, and so your left rear would get worked harder and so would be hotter. Hope that makes sense.
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Old 08-31-2010, 03:45 PM   #6
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Quote:
Originally Posted by housey View Post
If the circuit you race around is clockwise then I would expect there are more right hand corners than left, and so your left rear would get worked harder and so would be hotter. Hope that makes sense.
Yea that makes complete sense except there are 6 right and 5 left of which the faster turns are left. The really crazy thing is I got a bad batch of OFNA slicks cause on the first run, the pre-mounted RR tire came unglued TWICE and then blew up (obviously this was the last run today)
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Old 08-31-2010, 07:30 PM   #7
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Just for reference, anything over 180F is too hot. Once you get around 200F, you will demagnetize the motor and it will be ruined. If you can keep it closer to 150-160F like you are now, you should be fine. It's always best to keep a safe margin of error.
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Old 08-31-2010, 07:54 PM   #8
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Here's a vid that shows when my tire blew up It's in the last 10 - 12 min mark.
http://www.youtube.com/watch?v=Ax11ozEs3mw
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