NEU motor question

[Gary]

I ran into a problem with my 1527.5y motor and sent it back to NEU. They replaced the stator and said it would be good as new. The motor still is 15 mph off its speed but seems to work correctly other than that. Turning the motor over still has a magnetic "pull" to it but I still think something is wrong. I put in a new radio and reciever, Brand new TP 65- 130c 5,000 batteries and than swapped out the 240hv for a new one and it still is way off. Cant get ahold of NEU so I thought I would try here. Anyone ever have this?

[RaceMechaniX]

Were you using the exact same prop and speedo settings? Advance the same? Strut setting, etc?

If the motor came back from Neu rebuilt it should not be the problem.

TG

[Gary]

Thats what I would say. Everything is the same , nothing changed eccept the fact that the motor died on me. I can see a couple mph off do to weather and what not but this boat is incredebly consistant every time ....or was LOL

[RaceMechaniX]

Have you checked all the solder connections, driveline is free, etc? Any logged data?

[Gary]

Yes all bullets where replaced with my spare HV240. Eagle tree shows around a 3,000-4,000 rpm less and thats why I thought the batteries where getting tired so I bought brand new TP's and no change. I just stripped the boat down and went through everything and even checked the wieght again. Oh well I guess I will have to send the motor back just to have it rechecked and then go from there.

[RaceMechaniX]

And you said they changed the stator not the rotor? Perhaps when they changed stators they used a different winding style or skewed stator. Does the new one have the same cogging torque or a reduced cogging torque when turned over by hand?

[Gary]

It seems to be the same to me but I dont have another to compare it to. I would say the winding is the same because if I go to LIVE data it shows the correct rpm for the voltage when bench testing. But again its off the pace when in the water and even sounds like its at a lower rpm at full throttle.

[m4a1usr]

I put in a new radio and reciever

Gary,

This raises a red flag right away. Are you sure the end point adjustments are the same as prior to your other system? I know when I change from one motor to another I try and stay with the same radio system. Its tough enough to second guess the variables but you might find the new radio system is not setup the same. That would certainly explain a minor difference you are seeing. Any chance you have a KV checker? Spin it up on 10 volts and see if the motor KV is per Neu spec's.

John

[Gary]

Hi John. No you misunderstood. Those parts I changed, the radio and reciever, came after the problem . I was swaping stuff out to see if it would make a difference.
And yes when I check the KV its right on the money with the voltage reading on the Data Logger in live mode which is really strange. Tuesday I am going to run it with my 14.8 batts to see if it runs slower than 70 mph. It was very conssistent at 69-70 with 14.8 so I will see if it slowed down at all with less voltage.

[m4a1usr]

Ahh. I gottcha. Sorry I read it wrong. So let me ask you one other question. When you got the new rebuilt motor from Neu did it come with the same size or diameter motor leads? The reason I ask is I bought a used 1512 and it was hosed. I gambled and lost. So I sent it in to Neu and they replaced the stator, claiming a short in the windings. I had them rebuild it and when I got it back. Low and behold, the motor leads are not 3 heavy gauge wires. They appear more like 12 ga wires. Not the 10ga I remember sending off to them. Now in defense of NEU the motor performs just like new. As it should. But I kept a picture of the motor before sending it off and there is no doubt in my mind the motor leads are now a different gauge. I'm not sure on the bigger motors if this could be an IR issue but this might jog your memory?

John