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Wayne 962 Wayne 962 is offline
Author of "101 Projects"
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Regarding the 4/5/7R cases. First of all, nothing is ever set in stone. Porsche is and was a small car company, and if they had extra cases lying around, no doubt they would use them. It certainly is possible that your E came from the factory with a 7R case.

However, the 7R case has specific bosses cast into it that allow it to work with the CIS injection system - the 4R and 5R cases do not. This has to do with the accelerator linkage setup on the CIS injection, versus the MFI setup. That is why, if you decide to use an early 2.0 aluminum case with a CIS engine, you will need to have the bosses added / welded onto the case (not a huge deal actually).

I do know that replacement cases from the factory were 7R cases - after a while, that's all they had. So, if you ordered a replacement case for your 2.4 motor, you got a 7R case. It would be my best guess that this engine case that you have is not an original case, but is a replacement case.

Ehh, it doesn't really matter...

Wayne R. Dempsey, Founder, Pelican Parts Inc., and Author of:
101 Projects for Your BMW 3-Series 101 Projects for Your Porsche 911 How to Rebuild & Modify Porsche 911 Engines 101 Projects for Your Porsche Boxster & Cayman 101 Projects for Your Porsche 996 / 997 SPEED READ: Porsche 911 (October 2018)

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Old 10-02-2005, 01:30 AM
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