IMS question. - 986 Forum - The Community for Porsche Boxster & Cayman Owners

ppbon · 03-13-2009, 02:00 PM

Quote:

Originally Posted by mikefocke

My prior 914 couldn't stay out of the shop.

That's because it wasn't my shop

Happy Boxstering,
Pedro

jmatta · 03-14-2009, 06:55 AM

Thanks again, Charles. As I've said before, you take alot of the mystery out of these engines with your explanations, and now the videos.

Brucelee · 03-14-2009, 08:30 AM

The video is worth a million words, especially because it is so well done that it takes a lot of the mystery out of this particular weak point in the M96 engines. It is an excellent supplement to the article on your website.

C'mon. Porsche will not admit that there is any "weak points" in these engines. That is just a vicious rumor spread by BMW, right?

Blue-S · 03-14-2009, 09:13 AM

This may be a dumb question, but here goes: Surely, they don't support the whole IMS with a bearing at just one end. There is a bearing at the other end of the IMS, right? What does that bearing look like? Why doesn't it fail?

cnavarro · 03-14-2009, 04:00 PM

It's just a plain bearing on the other end. **Correction, as Jake pointed out, it just rides in the case on an oil film.** All the thrust is handled by the ball bearing as well.

Originally, in all the aircooled 911s, the intermediate shaft had plain bearings on both ends with one having a thrust surface, if memory serves me. Interestingly, the GT2, GT3, and Turbo use a shaft like the aircooled one since the engine is so close to an aircooled 964 that was water cooled!