3 phase vs single phase

[uneasy rider]

I have a 3 phase set up on my 1975 Commando. the stator is cracked and breaking up. Can I just replace it with my single phase stator without changing anything else? Just plug it in and go?
I have heard that the 3 phase stators can overhear, crack and fail.

Tks

 

[kommando]

I ran a single phase alternator though a 3 phase reg/rect for a number of years, you connect the 2 wires out of the alternator to any 2 of the 3 input wires of the reg/rect.

 

[HouTexNorton]

I had the same problem. After burning up two 14.5A 3 phase stators, even after increasing the rotor/stator gap, I went back to my original 10A single phase stator and now all is well (hooked up to my Trispark 3 phase regulator like kommando stated). No charging issues even with a cNw electric starter (I also have all LED lighting). Trispark now only recommends and sells the 10A single phase stator for use with their regulator.

 

[uneasy rider]

I am looking at a Lucas, high output, single phase 16 amp stater. I think I will try going with that.

 

[MichaelB]

I am looking at a Lucas, high output, single phase 16 amp stater. I think I will try going with that.

I smoked my 3 phase and am curently running one of these through a Tri-Spark mosfet..
Works fine...

 

[YING]

The instructions on the Tri-Spark regulator/rectifier states that it can be used with either 2 or 3 wire stators.Finding a 10.5 amp 3-phase stator can be a challenge
Mike

 

[uneasy rider]

The instructions on the Tri-Spark regulator/rectifier states that it can be used with either 2 or 3 wire stators.Finding a 10.5 amp stator can be a challenge.
Mike

The Lucas, single phase, high output, advertises it to be 16 amp.

 

[kommando]

The current 'Lucas' is a copy with the Lucas brand licensed/rented by Wassell to add a thin fragile coating of genuineness.

There are 'Lucas' 10.5A 3 phase around, how they perform in terms of longevity compared to the 16.5A I have no knowledge.

Lucas Stator RM24 12V 10.5A | Triumph T140 | 47252

Genuine Lucas alternator stator p/n 47252. Fits Triumph T140 pre electric start models RM24, 12 volt, 10.5 A, 150 watt, 3-phase.

rexs-speedshop.com

 

[Jonez69]

I burned up two 3 phase in short order on the 74' Commando I just rebuilt this past winter. I attributed it to having adjusted the primary chain too tight, causing excessive crank flex, and sloppy tolerances from the stator and rotor manufacturing. I also run the Tri-Spark MOSFET. In my frustration, I bought a Sparx 3 phase and had .010 shaved off the rotor, which is also a Wassel/Lucas replacement. Then, using a strip from a soda bottle as a spacer/gauge, I turned the engine over about 1/8th of a rotation each time and marked where I was still getting a tight clearance. Next, I used a Dremel to take away material from each place I experienced a clearance issue. Sounds extreme, I know, but after $400.00 burning up, I was willing to try anything. The Sparx stator is much cheaper than the Lucas.
Looser primary chain and more clearance and I am getting 14.6 Volts at the battery when revving the engine. So far, so good. I have installed several 3 phase stators and Tri-Spark MOSFET on unit Triumph using the soda bottle spacer and have had no problems. I think the over-tight primary chain pulling on both the gear box and the crank shaft have played more of a role than heat generated electrically. I admit, I am just a hacker and make no claim to know anything. I just have suspicions ....

 

[cliffa]

I burned up two 3 phase in short order on the 74' Commando I just rebuilt this past winter. I attributed it to having adjusted the primary chain too tight, causing excessive crank flex, and sloppy tolerances from the stator and rotor manufacturing. I also run the Tri-Spark MOSFET. In my frustration, I bought a Sparx 3 phase and had .010 shaved off the rotor, which is also a Wassel/Lucas replacement. Then, using a strip from a soda bottle as a spacer/gauge, I turned the engine over about 1/8th of a rotation each time and marked where I was still getting a tight clearance. Next, I used a Dremel to take away material from each place I experienced a clearance issue. Sounds extreme, I know, but after $400.00 burning up, I was will in to try anything. The Sparx stator is much cheaper than the Lucas.
Looser primary chain and more clearance and I am getting 14.6 Volts at the battery when revving the engine. So far, so good. I have installed several 3 phase stators and Tri-Spark MOSFET on unit Triumph using the soda bottle spacer and have had no problems. I think the over-tight primary chain pulling on both the gear box and the crank shaft have played more of a role than heat generated electrically. I admit, I am just a hacker and make no claim to know anything. I just have suspicions ....

View attachment 124432

Don't use Diet Cola bottles, - you won't get enough clearance