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Professor Motor B52 ball bearing motor


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#76 Matt Sheldon

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Posted 30 June 2019 - 10:47 PM

I have 4 coming to test for an enduro I am putting together. Flexi based cars, going to gear them at 11/37 to start with .750ish tires. Will post some results this weekend.


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#77 swodem

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Posted 30 June 2019 - 10:48 PM

I have 4 coming to test for an enduro I am putting together. Flexi based cars, going to gear them at 11/37 to start with .750ish tires. Will post some results this weekend.


Sounds like a blast!!
How long is the enduro and what chassis are you using?


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Steve Meadows


#78 Matt Sheldon

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Posted 30 June 2019 - 10:55 PM

Sounds like a blast!!
How long is the enduro and what chassis are you using?


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Hi Steve,

 

4 hours and equally prepped Mossetti Defenders. I will build all the cars identically. 


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Matt Sheldon

#79 TallyBernie

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Posted 03 March 2020 - 06:34 PM

Anyone have news/updates on B52 (50K) testing or use?
Keith Bernstein

#80 bbr

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Posted 03 March 2020 - 08:34 PM

had a guy dyno one and we compared it to RH, more rpms throughout the range.

been running one in a retro CA, pulls hard off the turns and lotsa rpms.

I think the bbs minimizes and vibrations from out of balance arms... smoother, more rpms.


Mike Low
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Give me enough rope and I'll build a fast car... or hang myself?

#81 TallyBernie

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Posted 03 March 2020 - 08:44 PM

Thanks bbr, this is good info.

Were going to begin an honest round of testing, to folllow up my limited one-time test of the B52 last year.
Keith Bernstein

#82 swodem

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Posted 20 March 2020 - 02:50 PM

So we had our National Enduro last weekend using these motors

C43 Chassis, B52-50k (handout) and fixed 12:37 gears, using the ISRA Production Saloon body

 

Was a complete failure as far as the motors were concerned

 

The Enduro was 9hrs. Teams had two handout motors (and there were no spares)

Top Qual lap times were in the 6.3's, which is pretty good. The best PS4002FK/LMP combos will do 6.1's

 

The gearing was too tall, and the motors ran really really hot, then lost all brakes by the halfway point. This happened to ALL 6 TEAMS. Not long after, maybe at 6hrs, they started getting to the end of their brush life, wearing through the copper arm and and stopping dead. Everyone replaced their motors. 

 

We even lost a motor during testing to the no-brakes mode

 

Now we tested these motors previously and at 11:37 they were fine, ran great and hard for 4.5hrs, and then another 2hrs in another event, and not showing any sign of wear

 

I guess they just don't like being tall geared?

 

Anyone else had a similar experience 


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#83 TallyBernie

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Posted 21 March 2020 - 12:17 PM

Wow! I certainly wasnt expecting this news.

My raceway just added the B52 to our approved weekly racing motor list, alongside the Hawk 7 and Eagle. We did some serious testing but not at enduro lengths as you have. Our heats are either 2.5- or 5-minutes. We run 13/37 and the motors get warm but not ridiculously hot. Thus far, the motor seems good for several races, if not a season.

However, several of us have noted that the B52s brakes seem to drop off with extended practice runs.

I hope others chime in here with their B52 (50K) experiences.
Keith Bernstein

#84 bbr

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Posted 21 March 2020 - 01:46 PM

That's what I noticed too. Brake going away. Probably heat killing the magnets, but it recover after cooling off.
We dyno one and lots of rpm. Running conservative gearing and letting the rpms do its job is probably the way to go with this motor.
Mike Low
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#85 Rich Joslin

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Posted 21 March 2020 - 10:20 PM

I preface this post by pointing out my limited experience with different motors. In fact I only post here because I have been running a B52 motor in my "play car" at the suggestion of a trusted mentor who has tried one out and liked the results he is getting. This has been a bit of an experiment for us as only 3 local guys have this motor and only 2 of us have had the opportunity to run it much. I have purposely tried to somewhat abuse the motor to see how it holds up. This testing, if you will, began January 26.

 

The track is a 145' Ogilvie Hill Climb

Motor is mounted in a Cheetah 11 chassis.

I have been running it with a .010 JK Audi R8C body.

Total weight is 103 grams.

I have been keeping the tire sizes in the .690 to .710 range.

Gearing is 11/37

Controller is a Difalco HD201 with a 113 chip.

 

My first impression was how smooth the response was. Initially I was running laps in the 4.8's but soon I was down in the 4.4's on occasion. Better more experienced drivers than me were able to get to 4.2's consistently with the car.

 

I have been running this car in long practice sessions often for a couple hundred laps or more with minimal breaks. My notes when I had 950 total laps (Feb. 2) on the car are that it seemed to slow down as it heated up. In that 250 lap session I had gone from consistent 4.5's to having difficulty getting it under 4.8. After letting it cool down the performance did pick up a bit but not like it was at the beginning of the session. 

 

At the suggestion of an experienced racer I flushed the motor with WD40 Specialist Electrical Contact Cleaner. The flush did wash out quite a bit of dark matter I am assuming was oil and brush dust. On the next session my lap times were back in the 4.4/4.5 range. I ran 250 laps with it that night.

 

I ran another 450 laps over two sessions with it before performing the same flush. At the session following the second flush my notes are that I was running 4.6's before it heated up and slowed down to 4.9's. *Please keep in mind there was a period of time when the track was getting dirty due to the owner being out with a medical situation. I am sure this had some impact on the lap times.

 

After 345 laps on Feb. 12, 500 laps on Feb. 22 and 100 laps on Feb. 28 I was up to 2,595. At the last session my feeling was the brakes were going away and the performance was going away as well. I have not had a chance to run it again since.

 

I like this motor. It is quiet and powerful with a very smooth response. I believe in a normal racing format with 2-5 minute stints and a 2 minute break between stints the heat build up would be minimal enough to not cause any performance decline. I also believe this motor would hold up well over multiple races. I will be buying another one soon and would recommend it to anyone looking for something "different" to try. 

 

 

 

 

 


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#86 TallyBernie

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Posted 22 March 2020 - 09:57 AM

Great report Rich. Do you have comparable Hawk 7 or Eagle data?
Keith Bernstein

#87 Rich Joslin

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Posted 22 March 2020 - 10:56 AM

Thanks Keith. 

I do not have any comparable data on the motors you mention but I believe my partner in this will have some information on how the B52 compares to the Hawk 7. He is composing his thoughts on the topic. When he shares that information with me I will be sure to post it.



#88 Tim Neja

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Posted 22 March 2020 - 02:15 PM

It will be a while but I ordered 3 of these to test against our Hawk 7's at BPR on the flat track.  They are capable of 3.78 and 3.7's with a flexi chassis and high downforce LMP body.  Once the virus panic is over--I'll be able to get some testing in.  Curious to see how they run against the Hawks!!  


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She's real fine, my 409!!!

#89 TallyBernie

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Posted 22 March 2020 - 03:41 PM

Thanks Tim, sounds good.
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#90 Rich Joslin

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Posted 22 March 2020 - 08:46 PM

The information below comes from a much, much more experienced slot car enthusiast than myself. He is the one who encouraged me to put the B52 in my play car. He is extremely analytical in his approach to his cars and the response he gets to any changes he makes to them. There are two responses one in general and a second in response to the question of how the B52 compares to the Hawk 7.

I would like to thank Mr. T for sharing his input. 

 

I was glad to see a few more posts being made concerning the B52 and even a well written review from my buddy Rich.
I myself was the first at our Raceway to give this motor a try and only for my own entertainment. I have to say,it's my favorite mini can motor to date.  
The setup it's in is a Mossetti Defender with the light steel pan.  Geared 11/36 and medium wonders @.690-715 dia.  It sits around 80g .
Speed wise, on our 145 ft hillclimb its vary comparable to a good fk or H7. More like a H7 with a longer, flatter power curve and is extremely enjoyable to drive.

Reliability wise, I've had n0 issues.  It has been ran hard and long each time it's put on the track usually running between 15 to 30 minutes a shot.  There was one stint it was ran for 300+ laps nearly non stop.
I haven't been tracking the laps but I'm sure I'm well over 2000, pushing 3000 I'm sure and it's still going strong .  Still some brush left too!
For its remaining laps I may try a 10/35 as even when I run down a tire to the .680 range the motor just keeps pulling. 
As far as lap times go, with aluminum pan (76g) and Renegade body, 3.8s were the norm.  JK lmp bodies, low 4.1. JK lmp hd body, 3.9 to low 4.0.  Those times are with good to very good track conditions. 
Looking forward to getting another one and seeing how it compares. 

 

This is in response to a post from TallyBernie.

First off I have to admit I have limited experience with the H7. It's just not a motor that has been used at our facility. I do like the motor very much however!
That being said, I can't say the setup I had was the most race optimized. Again I had that in a Defender at around 80g. 11/37, 700- 720 medium wonders. A decent baseline setup I think. Thinking back and depending on body the times were in the low 3.9 to high 4.0 range. 
As far as a more direct comparison I'd say that the H7 has more punch down low and into the midrange. The B52's powerband is much smoother and more linear. Has a softer hit but winds up quick (If not taxed by weight or over gearing).  Plus being that it's a 50k rpm motor, has a few more revs than the H7.  That alone can help in the corners. 
I'm not sure if I've found the sweet spot as far as rollout yet. When last at the track I let the tire get down there, around .670 In diameter,  a 4.76 rollout and it seems to just keep getting better. 

 

   

 



#91 TallyBernie

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Posted 22 March 2020 - 10:25 PM

Thank you Mr. T and Rich! This is very useful information and somewhat substantiates what Ive heard from other respondents. That is, dont overgear the B52. Curious though, you have run the motor in long stints without incident. What voltage do you run at your raceway?
Keith Bernstein

#92 Rich Joslin

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Posted 23 March 2020 - 11:28 AM

Thank you Mr. T and Rich! This is very useful information and somewhat substantiates what Ive heard from other respondents. That is, dont overgear the B52. Curious though, you have run the motor in long stints without incident. What voltage do you run at your raceway?

 

You are welcome Keith.

 

Voltage is 13.2







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