converting 1970's lima

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deanno
Posts: 65
Joined: Sun Jul 08, 2007 11:42 pm
Location: Luton,Beds

converting 1970's lima

Postby deanno » Sun Dec 02, 2018 1:37 pm

I have an old Lima class 33 and a Fowler 4f,is it possible to convert these to DCC.


Just found a post on this

Bigmet
Posts: 6657
Joined: Tue Aug 14, 2007 2:19 pm

Re: converting 1970's lima

Postby Bigmet » Sun Dec 02, 2018 4:31 pm

Lima is very straightforward for DCC conversion, you just remove the two wires connected one to each brush, and connect these wires to black and red on the decoder. Orange and grey wires on the decoder are connected one to each brush terminal. And you are done. There are obviously other ways: removing much or all of the original wiring and connections, adding extra pick ups, (always a good plan) and the like.

Make sure that the models are good runners before commencing, DCC will not magically improve a poor runner. But usually considerably more running refinement is available with a DCC decoder installed, the noise however will be unchanged...

Suzie
Posts: 287
Joined: Tue Dec 17, 2013 11:46 pm

Re: converting 1970's lima

Postby Suzie » Sun Dec 02, 2018 5:26 pm

They are very easy to convert, but you might need new wheels.

Get a decoder with a big stay alive (plenty of room for the capacitors) and fit a set of Ultrascale wheels and you will have a usable loco.

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Mountain
Posts: 3920
Joined: Mon Oct 24, 2016 3:43 pm
Location: Somewhere in Wales, UK.

Re: converting 1970's lima

Postby Mountain » Fri Dec 07, 2018 10:49 pm

I have used old Bachmann decoders and also a few Lenz 103XF decoders and they work fine. I sometimes have to dissable certain settings to enable the decoder to run in its purest form (E.g. dissabling the back emf, inertia etc) as the loco runs better like that. Other then that all should run well as if it was run on D.C.

gppsoftware
Posts: 195
Joined: Thu Mar 09, 2006 5:34 am

Re: converting 1970's lima

Postby gppsoftware » Sun Jun 23, 2019 6:27 am

Many years ago, I fitted an ESU Lokpilot to a Lima class 117 DMU:

https://www.youtube.com/watch?v=89UzmOeuCk4

It totally transformed the drivability of the model.
My suggestion would be that if you want to fit decoders to Lima locos, be selective about your decoder choice: a good quality decoder can transform the loco, a cheap decoder will not.
As others have suggested, Lima models always benefit from extra pickups.

The pickup issue on Lima locos is widely misunderstood. Irregularities in the traction tyre thickness, together with vibration from the motor caused them to constantly wobble which in turn caused loss of pickup.

As you can see in my video, the 'growling' (and therefore, vibration) of the motor has been significantly reduced by the ESU decoder properly controlling the motor. Net result was that it ran significantly better. I didn't realise that a Lima loco could actually run so well!


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