Why not make a "knowledge base" section, based upon each of the models.
Example, for each model, a different sub-forum for:
Engine
Brakes
Suspension
Exterior
Interior
Miscellaneous
When one of the members does a good technical write up, the subject could be posted directly into the KB, similar to what has been done in the Car Care forum. Since many of the common Q's on the forum are repeated month in month out, this would make things simpler for everyone.
I would also suggest that replies to any KB theories are not permitted in the KB forum, but are posted and answered in the relevant public forum.