![]() |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
![]() |
michel richard |
![]()
Post
#21
|
Senior Member ![]() ![]() ![]() Group: Members Posts: 1,291 Joined: 22-July 03 From: Longueuil, Québec Member No.: 936 ![]() |
Whenever a discussion comes around as to which /6 engine case to use for a high peformance engine, the talk always revolves around the early aluminum case, the early mag cases or the 7R cases.
My 2.2 E is built on a 5R case, which is the case that was used for most 2.4 engines, including most 2.4S engines, I believe. I've never done a detailed side by side comparison of 5R and 7R cases, but I could'nt see differences between a 5R in my hands and pictures of 7R cases. I could see a number of differences between 3R (early mag) and 5R, however. And I did have to get creative to fit the 2.2E distributor to the 2.4 case (the hole was too big, and the locking mechanism different). So what is it? Do people forget the 5R because it's close to the 7R, because discusssions have just not gotten around to it ? because it's a little rarer ? or another reason ? I'm asking because I'm beginning to contemplate a short stroke 2.5 project, and I would really like to keep my case. The advice is often: go to a 7R, it'll end up cheaper etc . . . But I had to go through 4 cases before finding the one I have - finding good cases is harder when you're not in California, so that starting with a known quantity is a definite plus. So, the question really is: can anybody help me figure out what the differences are between 5R and 7R cases ? TIA Michel Richard |
![]() ![]() |
J P Stein |
![]()
Post
#22
|
Irrelevant old fart ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None ![]() |
I compared the 2 side by side.
Tim is right, the 5R has the stiffening at the flywheel end, but not the internal bracing. The 5R also has the thicker spigots that the 3R doesn't and will thus take the overbore that is marginal on the latter. The later 7R (76 & up) has the oil bypass mod built in and the larger scavenge section oil pump.....HP builders save money there. Got to rootin' around in JimCs' new car/motor this morning, but I'll let him tell ya about it. |
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 26th June 2024 - 01:09 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |