Ticking comes and goes - Page 3 - Rennlist - Porsche Discussion Forums

Notices
996 Forum
Sponsored by: LN Engineering
Sponsored by: LN Engineering

Ticking comes and goes

Reply

Old 12-13-2017, 12:01 PM
  #31
SeaBass8
User
 
Join Date: May 2017
Location: Boston MA
Posts: 36
Default

Originally Posted by AWDGuy View Post
That good it threw a code, might be a simple fix.

mine never threw a code. Even with severe scoring in cyl 4 & 6 never threw a code. In fact if you ignored the knocking noise, you wouldn't even know. Idled fine and always pulled like a train.
This brings up a question... What's the end game with cylinder scoring? Failing performance to the point where it's not a viable running engine? What's the cost to correct this situation? Is it worth the cost? How long can an engine run with this condition before it gets to critical mass.

Not trying to hijack and this may be a topic for it's own thread...
SeaBass8 is offline  
Reply With Quote
Old 12-13-2017, 12:04 PM
  #32
AWDGuy
User
 
Join Date: Mar 2011
Posts: 1,698
Default

Yes it's been thoroughly covered in other threads. You can start here:

https://rennlist.com/forums/997-forum/931305-poll-scored-cylinder-failure-for-your-997-y-or-n-tell-us-yr-997-1-or-997-2-a-8.html
AWDGuy is offline  
Reply With Quote
Old 12-13-2017, 12:55 PM
  #33
SeaBass8
User
 
Join Date: May 2017
Location: Boston MA
Posts: 36
Default

Originally Posted by AWDGuy View Post
That good it threw a code, might be a simple fix.

mine never threw a code. Even with severe scoring in cyl 4 & 6 never threw a code. In fact if you ignored the knocking noise and the massive amounts of oil burning, you wouldn't even know. Idled fine and always pulled like a train.
Originally Posted by AWDGuy View Post
Yes it's been thoroughly covered in other threads. You can start here:

https://rennlist.com/forums/997-foru...997-2-a-8.html

Thanks for the link... I never go over to that area of the forum. Good read. I'll do some more searching. In my case, if it ever comes to this, I've already decided an engine rebuild/swap is not economically prudent. I am curious as to how far one can drive with these conditions. Did I see you post in the 997 thread you shared? You have scoring and still running strong?
SeaBass8 is offline  
Reply With Quote
Old 12-13-2017, 12:59 PM
  #34
AWDGuy
User
 
Join Date: Mar 2011
Posts: 1,698
Default

AWDGuy is offline  
Reply With Quote
Old 12-13-2017, 01:05 PM
  #35
Ahsai
Addict
Rennlist Member
 
Ahsai's Avatar
 
Join Date: May 2005
Posts: 6,358
Default

Originally Posted by tlakeusa View Post
Could not get it narrowed to one spot. I can retake from under the car or lid up and inside.Then post up for all to peruse. Went to pick it up the other day and it threw a code P1325. Apparently it is cam alignments being off ? Ill know more today. Thx Dr Strangelove for the youtube help and remember no fighting in the War room. Thanks for the input. The saga grows.
Agree with others the ticking doesn't sound as solid as knocking from bore scoring. You may want to check your cats to eliminate it's not cat with loose element inside (your sound doesn't like it but it's free and one more thing to eliminate). Just place a long screwdriver between the cat and your ear and you will hear it if it's knocking.

Re P1325, it's bank2 variocam issue. There are many things to check so it will take some good diagnostic to narrow down the culprit before you start replacing anything (can be very expensive if you just throw parts at it w/o deep diagnostic).
Ahsai is online now  
Reply With Quote
Old 12-13-2017, 03:14 PM
  #36
tlakeusa
Addict
Rennlist Member
Thread Starter
 
tlakeusa's Avatar
 
Join Date: Jun 2016
Location: Los Angeles
Posts: 121
Default

Great info and questions , I too have been pondering the financial worm hole. I look forward to reading the above links. As I progress I will keep posted. BTW car still drives very well despite the tick , as reported above

wormhole is a theoretical passage through space-time that could create shortcuts for long journeys across the universe. Wormholes are predicted by the theory of general relativity. But be wary: wormholes bring with them the dangers of sudden collapse, high radiation and dangerous contact with exotic matter.
tlakeusa is offline  
Reply With Quote
Old 12-13-2017, 03:39 PM
  #37
Charles Navarro
Addict
Rennlist Member
 
Charles Navarro's Avatar
 
Join Date: Mar 2002
Location: Momence, IL
Posts: 467
Default

Originally Posted by SeaBass8 View Post
This brings up a question... What's the end game with cylinder scoring? Failing performance to the point where it's not a viable running engine? What's the cost to correct this situation? Is it worth the cost? How long can an engine run with this condition before it gets to critical mass.

Not trying to hijack and this may be a topic for it's own thread...
The progression of a cylinder failure from scoring typically first starts with the ferrous coating falling off the piston skirts. You then get aluminum to aluminum contact between the skirt and bore with highest amount of side loading (and wear) at BDC (bottom dead center). Loads are highest here because the pistons come out of the bore 2mm with the 78mm stroke and 7mm with the 82mm stroke.

Eventually, as wear increases, the clearance opens up, and scoring will increase further up the bore from foreign object debris in the oil. Ticking is usually the increased piston to cylinder clearance which is the first symptom, followed by oil consumption, then fouled plugs and misfires.
Charles Navarro is offline  
Reply With Quote
Old 12-13-2017, 04:30 PM
  #38
SeaBass8
User
 
Join Date: May 2017
Location: Boston MA
Posts: 36
Default

Originally Posted by Charles Navarro View Post
The progression of a cylinder failure from scoring typically first starts with the ferrous coating falling off the piston skirts. You then get aluminum to aluminum contact between the skirt and bore with highest amount of side loading (and wear) at BDC (bottom dead center). Loads are highest here because the pistons come out of the bore 2mm with the 78mm stroke and 7mm with the 82mm stroke.

Eventually, as wear increases, the clearance opens up, and scoring will increase further up the bore from foreign object debris in the oil. Ticking is usually the increased piston to cylinder clearance which is the first symptom, followed by oil consumption, then fouled plugs and misfires.
Thanks for the info. Sounds like there comes a point in time where the blow by causes the plug/s to constantly foul out and effectively you end up with a dead cylinder/s
SeaBass8 is offline  
Reply With Quote
Old 12-13-2017, 04:52 PM
  #39
AWDGuy
User
 
Join Date: Mar 2011
Posts: 1,698
Default

Originally Posted by SeaBass8 View Post
Thanks for the info. Sounds like there comes a point in time where the blow by causes the plug/s to constantly foul out and effectively you end up with a dead cylinder/s
heres my scored cylinders:

(4 looked the same as 6)



here is bank 1 vs bank 2



close up of bank 2, no codes were thrown but you can see the build up on 4 & 6. As you can see, the build up can be quite significant without codes being displayed:

AWDGuy is offline  
Reply With Quote
Old 12-13-2017, 10:34 PM
  #40
SeaBass8
User
 
Join Date: May 2017
Location: Boston MA
Posts: 36
Default

^^^ thank you for the insight. Haven't had a chance to go through your thread yet but I see you pulled your motor and broke it down... Don't spoil the ending for me
SeaBass8 is offline  
Reply With Quote
Old 01-11-2018, 02:56 PM
  #41
rogazilla
User
 
Join Date: Mar 2017
Location: RTP, NC
Posts: 126
Default

Have you had any luck in finding the root cause or just decided to drive it as is?
rogazilla is offline  
Reply With Quote
Old 01-11-2018, 08:05 PM
  #42
tlakeusa
Addict
Rennlist Member
Thread Starter
 
tlakeusa's Avatar
 
Join Date: Jun 2016
Location: Los Angeles
Posts: 121
Default

No I have not .... the ticking is softer.The right bank of lifters were replaced, #1 was soft and squishy. Tensioners were replaced. Driven it with and additive Liqui Moly for over 400 miles , shot in the dark. I have changed the oil , put in new oil and filter. I am trying to post youtube vids of the 3 times after I went for long runs @ 70 miles plus at 4k to 5 - 6 k rpm on the roads, Even did a Newcomb ranch run just because. My indie has posted on his "indie blogs" . So far nothing. as mentioned , it has gotten softer. It runs great no issues just that damn ticking. When I get the vids up they will be posted as tlake ticking. Thanks for checking , Happy New Year
tlakeusa is offline  
Reply With Quote
Old 01-11-2018, 09:12 PM
  #43
tlakeusa
Addict
Rennlist Member
Thread Starter
 
tlakeusa's Avatar
 
Join Date: Jun 2016
Location: Los Angeles
Posts: 121
Default

Here is the latest vid from last weekend on youtube . Trying to get the two prior loaded.

tlakeusa is offline  
Reply With Quote
Old 01-11-2018, 10:15 PM
  #44
tlakeusa
Addict
Rennlist Member
Thread Starter
 
tlakeusa's Avatar
 
Join Date: Jun 2016
Location: Los Angeles
Posts: 121
Default

Up on the rack after the oil change. The one above I am thinking finally circulated fully at full temp ? To be monitored further this weekend

https://www.youtube.com/watch?v=DFt5...ature=youtu.be
tlakeusa is offline  
Reply With Quote
Old 01-12-2018, 01:23 AM
  #45
rogazilla
User
 
Join Date: Mar 2017
Location: RTP, NC
Posts: 126
Default

Originally Posted by tlakeusa View Post
Up on the rack after the oil change. The one above I am thinking finally circulated fully at full temp ? To be monitored further this weekend

https://www.youtube.com/watch?v=DFt5...ature=youtu.be
Post 43 sounds normal. Mine sounds like that but my driver side occasionally has injector noise from bank 1 mid cylinder which sounded like a little tick but definitely not a knock or cylinder scoring like other's video.

Post 44 may need some expert to listen to it as it sounds to have more bass... maybe it is the recording though.
rogazilla is offline  
Reply With Quote
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rs10
996 Forum
7
12-10-2017 02:16 PM
steveliu
991 GT3 GT3RS and 911R
4
08-23-2017 01:09 PM
AustinSedz
987 - 981 718 Forum
2
06-26-2017 01:58 PM
mm450exc
997 GT2/GT3 Forum
4
04-29-2017 07:49 PM
mikstew
Boxster & Boxster S (986) Forum
11
02-22-2017 06:20 PM

Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -3. The time now is 04:49 AM.


Copyright © 1998 - 2017 Rennlist.com We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: