We have 2 guys on our austrian forum running a Lehner 1950 in their truggys. A Lehner 1950 is comparable to a Neu 1515.
One of them managed to crack the first segment of his rotor while his plastic spur lost 2 tooths. He was running an old design Lehner 1950 without fan.
pictures from our member Josi on
www.offroad-cult.org
Lehner changed the rotor design to prevent the first segment to crack (it's always the first segment that will crack when excess stress is applied on the shaft).
There is now an aluminium plate in front of the first segment and the magnet segments are covered.
When choosing the fan version of their motors you should cover the air intakes.
A look inside a Lehner 1950 can. Windings are layed out very properly.
pictures taken from
http://sites.google.com/site/planbparts/. Our moderator on
http://www.offroad-cult.org
The easiest way to buy a lehner is to order it
directly from Lehner. They provide a motor hotline but are more specialised on boat application.
An LST is a big and heavy monster truck. You would want at least a Neu 1515 (a 1518 would be even more appropriate) or a Lehner 1950. A lehner 2230 is comparable to a Lehner 1950 (powerwise) and would also be a good fit torquewise (a good choice for Muggys too). As you are replacing a nitro motor revving around 30000-35000rpm max you should choose a motor on 5s which gives you a comparable max RPM for proper gearing an good pinion selection. 5s x 3,7V x 1800kv = 33300rpm. Before choosing motor kv you might want to play with BrianG's
speed calculator and have a look at how you will mount your motor and which pinion you will be able to fit.