I assume it got moved, or was there just not enough interest?

andernamen,

It's still here.
http://www.rcuniverse.com/forum/forumid_92/tt.htm

Click on yellow bar where it says JUMP TO...it is the forth one down from gas engines. It is now easy to find. A even better way is when you are viewing engine conversions...is to right click with your mouse an add a shortcut. Best Regards Capt,n