 Inside my air cleaner lid, Does anyone know what this is? |
|
|
|
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. |
|
|
  |
| nivekdodge |
 Sep 8 2025, 11:15 AM
Post
#1
|
|
Member  Group: Members Posts: 321 Joined: 28-August 21 From: Pittsburgh Pa Member No.: 25,860 Region Association: MidAtlantic Region 
 |
Hi
This is the bottom of my air cleaner lid. Anyone else get this and where’s it from? Do I need to fix it? Kevin Attached thumbnail(s) 
|
   |
 
|
| dr914@autoatlanta.com |
Sep 8 2025, 11:22 AM
Post
#2
|
|
914 Guru Group: Members Posts: 8,208 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
condensation blow by from not running the car to operating temperature often enough
|
 |
|
| nivekdodge |
Sep 8 2025, 11:54 AM
Post
#3
|
|
Member Group: Members Posts: 321 Joined: 28-August 21 From: Pittsburgh Pa Member No.: 25,860 Region Association: MidAtlantic Region
|
Thank's George
I'm sorry, it's not plain enough. That's oil and Bronze? from the valve guides? Kevin |
|
|
|
| porschetub |
Sep 8 2025, 02:08 PM
Post
#4
|
|
Advanced Member Group: Members Posts: 4,923 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(nivekdodge @ Sep 9 2025, 05:15 AM)  Hi This is the bottom of my air cleaner lid. Anyone else get this and where’s it from? Do I need to fix it? Kevin Are there any heat marks on the top side ?. |
|
|
|
| nivekdodge |
Sep 8 2025, 02:51 PM
Post
#5
|
|
Member Group: Members Posts: 321 Joined: 28-August 21 From: Pittsburgh Pa Member No.: 25,860 Region Association: MidAtlantic Region
|
They’re chrome but no burn marks
|
|
|
|
| mlindner |
Sep 8 2025, 03:06 PM
Post
#6
|
|
Senior Member Group: Members Posts: 1,703 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest
|
Do you have some backfiring go on. I get a little of that on mine from gass and vapors. Little each year (4000) miles, just clean with brake cleaner.
|
|
|
|
| nivekdodge |
Sep 8 2025, 04:31 PM
Post
#7
|
|
Member Group: Members Posts: 321 Joined: 28-August 21 From: Pittsburgh Pa Member No.: 25,860 Region Association: MidAtlantic Region
|
It doesn’t take that long. This is two afternoon rides. It wipes off but that’s not why I’m worried
|
|
|
|
| Puebloswatcop |
Sep 9 2025, 07:33 AM
Post
#8
|
|
Senior Member Group: Members Posts: 1,675 Joined: 27-December 14 From: Mineola, Texas Member No.: 18,258 Region Association: Southwest Region |
Have you adjusted the valves lately? I would check the valve adjustments first. If it continues valve guides may be an issue.
|
|
|
|
| infraredcalvin |
Sep 9 2025, 08:05 AM
Post
#9
|
|
Distracted Member Group: Members Posts: 1,673 Joined: 25-August 08 From: Ladera Ranch, CA Member No.: 9,463 Region Association: Southern California
|
This looks like it’s been on fire… I agree with the backfires…
 |
|
|
|
| nivekdodge |
Sep 9 2025, 02:32 PM
Post
#10
|
|
Member Group: Members Posts: 321 Joined: 28-August 21 From: Pittsburgh Pa Member No.: 25,860 Region Association: MidAtlantic Region
|
No just a shadow
Kevin Attached thumbnail(s) 
|
|
|
|
| PlaysWithCars |
Sep 14 2025, 06:41 PM
Post
#11
|
|
Senior Member Group: Members Posts: 537 Joined: 9-November 03 From: Southeast of Seattle Member No.: 1,323 Region Association: Pacific Northwest
|
Could it be reversion back through the carburetors? (small pressure waves coming back up the intake tract from exhaust pressure during overlap and/or rapid valve closure). More likely to occur on motors with an aggressive cam shaft and driving conditions where the throttle plate is open at relatively low engine speed.
|
|
|
|
| nivekdodge |
Sep 14 2025, 07:15 PM
Post
#12
|
|
Member Group: Members Posts: 321 Joined: 28-August 21 From: Pittsburgh Pa Member No.: 25,860 Region Association: MidAtlantic Region
|
QUOTE(PlaysWithCars @ Sep 14 2025, 08:41 PM) Could it be reversion back through the carburetors? (small pressure waves coming back up the intake tract from exhaust pressure during overlap and/or rapid valve closure). More likely to occur on motors with an aggressive cam shaft and driving conditions where the throttle plate is open at relatively low engine speed. It may be related to some of that. I have no idea what kind of cam is in there but it doesn't lope... but if we take off imediately it syutters a little till igets warm when the revs are low. so; Saturday l let it idle for a good 10 minutes before leaving. for a 35 mile ride. Some oil and bronze but not a lot. Sunday we left immediately and it stuttered on the way out of the plan, 23 mile ride and the build up was cosiderably more than Saturday But what does that mean? Kevin. |
|
|
|
| fixer34 |
Sep 14 2025, 08:48 PM
Post
#13
|
|
Senior Member Group: Members Posts: 1,337 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest
|
Did you say it is 'oil and bronze', as in engine oil? is the color the same what is on the dipstick? Bronze particles or bronze colored flecks?
And you can wipe it off/clean and a couple runs on the engine and it's back? Something very strange here... |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 15th September 2025 - 03:25 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.