Connecting Rod Orientation, Engine Assembly Question |
|
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. |
|
Connecting Rod Orientation, Engine Assembly Question |
BeatNavy |
Jan 12 2019, 07:03 PM
Post
#1
|
Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
Ok, may be a stupid question, but this is my first Type 4 assembly, so bear with me:
Is it critical that the connecting rods be oriented a specific way on the crank? I've got the numbers matched (rod to cap) properly, but how critical is it for the numbers to point up when the crank is flat as Raby mentions in his video? I got turned around and realized I oriented at least one differently. In the Wilson book he seems to mention that Type 4 are symmetrical and don't really matter (whereas Type 1 etc. need to have the bump on the rod facing up). If it is critical, I suppose I need new rod bolts now that I've torqued them to spec? These are H-Beam. TIA. |
Mark Henry |
Jan 12 2019, 09:24 PM
Post
#2
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Type 1 it matters as there's an offset on the big end, there's a bump on the stock rod that has to face up. If you're using a T4 stroker crank with T1 rods it matters.
I was always told unmarked symmetrical rod the bearing go tangs down, but honestly it doesn't matter, I just do it out of habit and so it doesn't freak out the next engine builder. First time I installed M96/97 Carrillo (996) rods I emailed Carrillo and asked if orientation mattered, the reply was a simple "Symmetrical rod, no it doesn't". ARP rod bolts/nuts can be torqued/reused several times as long as it maintains proper stretch spec. If not ARP I'd email the manufacturer (CB, SCAT) but likely their bolts can be reused as well. |
Lo-Fi Version | Time is now: 16th June 2024 - 08:27 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 ... |