Fried Lehner 1940? Help!!! - Page 3 - RC-Monster Forums

06.19.2007, 12:15 AM

I looked at the Kontronik motors again and noticed that they have a stainless steel can. Is that good? Stainless steel sucks at conducting heat.

jhautz · 06.19.2007, 12:39 AM

Quote:

Originally Posted by AAngel

I looked at the Kontronik motors again and noticed that they have a stainless steel can. Is that good? Stainless steel sucks at conducting heat.

Yea, SS is not a great thermal conductor. But as long as its thin it should be no big deal. The other negative is the glued end bells like the feigaos.

I guess ill see. I found a 600-18 for 130 so I figured what the hell. You guys cost me to much money. ;)

06.19.2007, 01:38 AM

Where'd you find that? I'd get one at that price. If you got it from a vendor, please post or PM a link.

jhautz · 06.19.2007, 08:21 AM

Quote:

Originally Posted by AAngel

Where'd you find that? I'd get one at that price. If you got it from a vendor, please post or PM a link.

espritmodel.com had it.

It was listed as $149 then slashed to 130. I bought it and then it said out of stock. Yesterday I looked and my order status was shipped and its not listed on the site any more. I musta got the last one he had.

Sower · 06.19.2007, 09:23 AM

Ok, so some people have said the 2240 will be too big and that's almost as bad as too small. My question is . . . what would be the perfect situation to run the 2240? Would it be 5s, 6s, 8s . . . ? I just want to know what I'm looking for so I can make my decision. Can anyone help me on that?

Thanks!

bdebde · 06.19.2007, 09:31 AM

Quote:

Originally Posted by Sower

Ok, so some people have said the 2240 will be too big and that's almost as bad as too small. My question is . . . what would be the perfect situation to run the 2240? Would it be 5s, 6s, 8s . . . ? I just want to know what I'm looking for so I can make my decision. Can anyone help me on that?

Thanks!

I don't think it's a matter of voltage, you have to be able to actually put the motor to work. That size motor would work well in a 1/5th scale.

Sower · 06.19.2007, 09:36 AM

In other words you're saying there needs to be a decent amount of resistance on it? Or that it needs to be pushing something more substantial than a CRT truggy?

See if that's the case then I'm a little confused. I thought for sure my 1940/10 was up to the task and it was toasted in 8 minutes. So to me, it seems like there's more resistance on these truggies in racing conditions than a lot of people might think.

captain harlock · 06.19.2007, 07:51 AM

I'm planning to get the Mambo-17 for my SuperMaxx. If it pulls the truck around with ease at 25.2 volts without heat issues, I guess we have a winner. The Mambos are FUN600 motors with finned aluminum cans.

bdebde · 06.19.2007, 09:41 AM

Sower, that's correct. I have seen others mention running them (larger motors), and then they seem to go back to running the smaller ones.

How old was the motor, was there possibly some other problem? Could have been a defect that caused a failure.

Sower · 06.19.2007, 09:46 AM

The motor was not very old at all - a few months of intermittent use. I hadn't had any problem with it until this race day. There were times it would get warmer than I thought it should, but never anything to be worried about. I started with a 15t pinion on the 44 spur and that got hot fairly quick, so I went down to the 13t and that helped. But all of my runs had been on loose dirt until this race day. On the race day, the track gets wet down for better traction and I think that's what did it. Just like racing on a carpet track vs. asphalt.

The way I see it right now, I can get this 2240 and try it out and if it doesn't work as I hoped I can sell it and get a Neu 1515. The Lehners keep their value pretty well if they're in good shape, and I'm not thrilled about plunging into the Neu/Quark realm. I would rather wait for the new ESC's to come out before I go Neu if I can help it.

06.19.2007, 10:43 AM

Sower, as I said, I don't have a Lehner, but the Lehners are ranked right up there with the best of the equipment available.

Take it from me, even the best equipment available is subject to a failure here and there. How long is the warranty on the Lehner motor that you have? Maybe you can send it in.

With regard to motors in general, you do control the max rpms with the voltage. I've found that something around 30,000 works very well in a truck. The problem with the larger motor is that you may not be able to gear it high enough to put enough of a load on the motor just pushing around the relatively light truck. I'm also not sure of how much current a 2240 will pull when properly loaded.

You might need to look into the specs of the motor a bit before you jump on it. Did you ask why he is selling the motor? What is he replacing it with? Whatever he is replacing it with might be what you need to get. LOL.

Sower · 06.19.2007, 10:51 AM

Great points, and yes I did ask. He actually has it in the Truggy section under CRT V2.0. He is now running a Neu 1515 with a Quark. He was originally running the 2240 on 8s in his CRT in a bashing/high speed open area so it was just for pure fun. He says his MGM esc was getting too hot and he wanted to try the Neu motors so he just did it.

In regards to the warranty, I think that might be a waste of time from what I've seen from others. The scenario I've heard is that you send the motor to Germany, wait for 6 months and then have to pay a couple hundred dollars for the repair.

I like your suggestion on checking the specs to make sure, but I'm just not finding a straight forward answer on it. I must admit thought, the technical part isn't my strong point. I'm more addicted to the driving fun! :027: So can anyone enlighten me? From my limited knowledge, the 4s will run about 22000 rpm (the 2240 is 1480 kv), and if I went to a 5s it would be 27000 rpm. My 1940 was a 1500 kv and I really liked the performance of it on 4s.