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On The Lead Lap
Posted 07 May 2018 - 01:57 PM
Greetings,
In setting up a new open motor, was curious how much of an offset gear mesh is too little to get away with? Should I go for a larger pinion or does this look appropriate? The spur is -2 deg and the pinion is straight. What do you think?
Thank you.
Checkered Flag in Hand
Posted 07 May 2018 - 03:17 PM
I would be looking for a 16deg spur gear. Is that a C can open motor?? 64P
jason
On The Lead Lap
Posted 07 May 2018 - 03:23 PM
Thank you for your reply Jason, it's appreciated. Yes it's a C can with an Proslot Infinity armature in a Mega III can using 64 pitch gears. So a 16 deg. is better? Ok. I will see if I can find any on PCH. I happen to have a 9 tooth 2 deg pinion, would either be a better idea? The issue is that I can't move the motor in (back) anymore but I'm fearing with this open motor the gear mesh is not enough and may strip? At this time it was advised to run a 8/39 64 pitch by Proslot. What do you think?
On The Lead Lap
Posted 07 May 2018 - 05:09 PM
Ok. Well I removed the pinion and tried different combination. An 8 pinion (2 deg.) didn't help anymore than the straight 8 pinion with either a 38 or 39 2 deg or straight spur. What I tried is a 9 pinion (2 deg.) with a 39 (2 deg.) spur and now it's SO much better! But is this ratio too crazy? This better ratio/mesh is going to be 5.70 where as Proslot advised a 6.41 ratio initially? Is this a bad idea?
The motor is a 30 Turn of 26 gauge wind.
Thank you.
Grand Champion Poster
Posted 07 May 2018 - 10:43 PM
30 turns of 26 is not a C-can wind. 
Checkered Flag in Hand
Posted 08 May 2018 - 10:25 AM
I would use 8/38 or 39 5deg pinion 16deg spur 64P
jason
Grand Champion Poster
Posted 08 May 2018 - 10:48 AM
Mike Swiss
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Five-time USRA National Champion (two G7, one G27, two G7 Senior)
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On The Lead Lap
Posted 08 May 2018 - 11:42 AM
Well, I got 9/39 to mesh way better. But it this too hot to run?
Checkered Flag in Hand
Posted 08 May 2018 - 11:46 AM
Yep, that's why you need an 8 or go to 72p. Try 9/43-44 angle on both gears.
jason
On The Lead Lap
Posted 08 May 2018 - 11:50 AM
So a 9/39 is too hot?
Checkered Flag in Hand
Posted 08 May 2018 - 12:00 PM
Maybe, depends on track and grip. Done it sometimes on our King, Gr 12. Faster than 8/39 but tends to run hot. And timing must be considered, too.
On The Lead Lap
Posted 08 May 2018 - 12:10 PM
Maybe, depends on track and grip. Done it sometimes on our King, Gr 12. Faster than 8/39 but tends to run hot. And timing must be considered, too.
Ugh... OK. I don't know what the timing is if any. It's not specified by Pro Slot. Would then a 9/43 in 72 pitch be the right gearing and would not have to move the motor as Jason recommends? For 9/44 I find in 72 pitch, but the pinion is 5 -deg and the spur is -2 deg. Will this work? There is also a -16 deg spur.
Grand Champion Poster
Posted 08 May 2018 - 02:20 PM
I read somewhere recently that a straight pinion with a 16° spur makes for an ideal mesh.
Just sayin'. 
On The Lead Lap
Posted 08 May 2018 - 02:47 PM
I read somewhere recently that a straight pinion with a 16° spur makes for an ideal mesh.
Just sayin'.
Ok thank you! I'll get the 16° and the 2° deg (just in case) to see which fits better. I'm assuming dimensional they will be like the 9/39 and I won't have to move the motor as it's in as far as it can go in there. 
Checkered Flag in Hand
Posted 08 May 2018 - 03:12 PM
That will work the 16 will will cover more of the Pinion
jason
On The Lead Lap
Posted 08 May 2018 - 03:26 PM
That will work the 16 will will cover more of the Pinion
jason
Awesome! Thank you for your help!
Posting Leader
Posted 08 May 2018 - 07:07 PM
I'm assuming dimensional they will be like the 9/39 and I won't have to move the motor as it's in as far as it can go in there.
Is the magnet up against the axle? A small notch in the magnet usually has no affect on performance.
On The Lead Lap
Posted 08 May 2018 - 07:09 PM
Is the magnet up against the axle? A small notch in the magnet usually has no affect on performance.
Is the magnet up against the axle? A small notch in the magnet usually has no affect on performance.
No not at all. What is, is the back of the can. It's completely flat against the motor box rear frame. I'll take a pic and post in a few min.
Posting Leader
Posted 09 May 2018 - 06:29 AM
Posting Leader
Posted 09 May 2018 - 06:36 AM
Checkered Flag in Hand
Posted 09 May 2018 - 10:18 AM
David that is Mild back when I started we ran 20/25 most of the time in C cans and Yes they did run Hot and we shunted also 24 and Double winds and the cars weighted a ton but were Fun
jason
On The Lead Lap
Posted 09 May 2018 - 11:55 AM
So is this motor going to blow up? 
On The Lead Lap
Posted 09 May 2018 - 12:02 PM
I have several of these arms in c cans running at 13.8 unshunted
I have never smoked one. I believe all are at 8/39.
it is a nice milder wind for a c can. there was one of these on epay
in a pro slot rtr a month or so ago--someone scored a good buy.
On The Lead Lap
Posted 09 May 2018 - 12:03 PM
I have several of these arms in c cans running at 13.8 unshunted
I have never smoked one. I believe all are at 8/39.
it is a nice milder wind for a c can. there was one of these on epay
in a pro slot rtr a month or so ago--someone scored a good buy.
Awesome post! Thank you!
Posting Leader
Posted 09 May 2018 - 08:50 PM
