 Piston damage, Is this piston toast? |
|
|
|
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. |
|
|
| Phoenix914 |
 Jan 4 2021, 12:25 PM
Post
#1
|
|
Member  Group: Members Posts: 389 Joined: 6-December 06 From: Oviedo, FL Member No.: 7,322 Region Association: South East States 
 |
Happy New Year!
I just cleaned up the pistons for my rebuild and found some pitting on one of them after all the carbon was removed.     This piston was at #1 cylinder. Is it unusable? I'm certain they are NPR 96mm pistons from a late-80's rebuild. I already bought new rings! Any opinions would be appreciated. |
   |
 
|
  |
Replies
| Tbrown4x4 |
Jan 5 2021, 06:06 AM
Post
#2
|
|
Senior Member Group: Members Posts: 704 Joined: 13-May 14 From: Port Orchard, WA Member No.: 17,338 Region Association: None
|
I think I also see evidence of the piston touching the head on the circumference of the piston top. As long as the ring lands aren't collapsed, I would dress up the impact damage on the piston tops, install new rings, and use the pistons again. Check the heads for contact, and measure the deck height. Also check piston pins and rod bearings. Any excess clearance could allow the piston to travel a little farther at TDC and make contact.
Also, you say "rebuild" but you're re-using low compression pistons? I assume you mean cylinder hone, new rings and budget re-seal? How deep are you going with this engine? |
|
|
|
Posts in this topic
Phoenix914 Piston damage Jan 4 2021, 12:25 PM
Superhawk996 Its gone.
That piston appears to be victim of de... Jan 4 2021, 01:29 PM
Phoenix914
Its gone. Time to move on.
Thanks for that con... Jan 4 2021, 01:36 PM
bbrock
Its gone.
That piston appears to be victim of d... Jan 4 2021, 01:48 PM Superhawk996
Care to elaborate on the diagnosis? I've se... Jan 4 2021, 02:38 PM bbrock
[quote name='bbrock' post='2880329' date='Jan 4 2... Jan 4 2021, 02:47 PM mepstein
[quote name='bbrock' post='2880329' date='Jan 4 2... Jan 4 2021, 03:15 PM get off my lawn If I were you (and you're glad I'm not) I... Jan 5 2021, 12:52 AM rick 918-S
If I were you (and you're glad I'm not) I... Jan 5 2021, 03:25 AM Phoenix914
If I were you (and you're glad I'm not) ... Jan 5 2021, 06:47 AM Phoenix914
I think I also see evidence of the piston touchin... Jan 5 2021, 08:11 AM Mark Henry I've built many engines with used jugs and slu... Jan 5 2021, 07:23 AM ejm
I've built many engines with used jugs and sl... Jan 5 2021, 07:36 AM Phoenix914
I've built many engines with used jugs and s... Jan 5 2021, 08:27 AM Shivers I agree with the statement above about saving them... Jan 5 2021, 08:33 AM iamchappy Can also ceramic coat them after cleaning them up,... Jan 5 2021, 10:08 AM 914werke
:agree: This is a good idea as cracks in the rin... Jan 5 2021, 12:39 PM 914sgofast2 If you are spending the money for Len Hoffman’s ... Jan 5 2021, 01:19 PM Phoenix914
If you are spending the money for Len Hoffman’s... Jan 5 2021, 03:34 PM mepstein Original cylinders are very good metal and are oft... Jan 5 2021, 03:48 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 2nd June 2024 - 05:13 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.