Spirit has changed motors frequently, as they are a small operation. Some have been sold in cars without any wrapper. The Slot Car News Motor List (linked above -- thanks) has the best info I could compile, supplemented by my own tests.
Would that be a long can (FK-180) without a wrapper? This is the no-wrapper motor in the Peugeot 406:
I don't know if it is the same motor, but the two cars were made around the same time. The specs are possibly the same as for the S3x. How exact do you need to be? Spirit motors came in different flavors with considerable overlap due to production variation.
Last edited by Robert Livingston; 06-11-2012 at 08:48 AM.
WoW your on the Ball.
That's her. ext. Motor. I get 19,456 rpm. Our test not that different.
Spirit S3X (FK-180) 24,000 RPM/12v(?); tested 19,725-19,814 RPM/12v, 26,163 RPM/15v
Have you got any photos of their motors?