It Was Going So Well, Then Something Broke |
|
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. |
|
It Was Going So Well, Then Something Broke |
Mblizzard |
Nov 16 2013, 04:02 PM
Post
#1
|
Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Well just got my carbs sorted. Went for a drive and something has come unglued in the bottom of the engine. Huge loud slapping like a rod banging. Very rpm related. On the 3 4 side. No damage to the plugs. Still runs but it is clear that something is very broken. Will check valves tomorrow but I am betting the case has to be split.
Any thoughts on easy things to check or where to start? (IMG:style_emoticons/default/headbang.gif) |
Mblizzard |
Nov 21 2013, 09:55 AM
Post
#2
|
Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
They were 96 mm AA. Of course that makes them suspect from the beginning. But their quality has improved some. But I hope I can at least get a new cylinder and piston and get this running again.
|
gothspeed |
Nov 23 2013, 04:27 PM
Post
#3
|
Senior Member Group: Members Posts: 1,539 Joined: 3-February 09 From: SoCal Member No.: 10,019 Region Association: None |
They were 96 mm AA. Of course that makes them suspect from the beginning. But their quality has improved some. But I hope I can at least get a new cylinder and piston and get this running again. I used AA 96mm pistons on my 'new build' ...... however before they were installed ..... the builder did an inspection of all the engine parts and one of the pistons had a casting defect on the wrist pin bore. The defect was detected under very high magnification ..... the builder let me see the defect on the inspection bench and sure enough it was there plain as day (IMG:style_emoticons/default/sad.gif) ................ so I took the defective piston back to AA and they gave me another one ..... which had to be machined and balanced to match the other three. Moral of the story ...... if I had run the defective piston ...... the wrist pin would have eventually pulled through the bottom of the piston ...... not that all possible bad has been prevented, but I am very happy that defect was found before putting the engine together ...... that 'find' alone was worth the extra dough paid to this experienced and renowned builder ....... (IMG:style_emoticons/default/popcorn[1].gif) |
Lo-Fi Version | Time is now: 6th June 2024 - 10:11 PM |
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 ... |