Notices
996 Forum
Sponsored by:
Sponsored by: LN Engineering

2005 996 C4S Bore Scoring and rebuild info

 
Old 07-02-2019, 07:20 PM
  #31  
wildbilly32
User
Thread Starter
 
wildbilly32's Avatar
 
Join Date: Feb 2015
Location: Nebraska
Posts: 1,594
Received 3 Likes on 3 Posts
Default

Originally Posted by cds72911 View Post
Is that also a chunk out of the cylinder wall at the lower left?
No engine expert here but I don't believe that is a chunk missing. The engine was running when sent in. I think Jake would have called if he had found an exploded cylinder liner. Regardless the liners get machined out anyway.
wildbilly32 is offline  
Old 07-05-2019, 12:16 AM
  #32  
Flat6 Innovations
Basic Sponsor
Rennlist
Site Sponsor

 
Flat6 Innovations's Avatar
 
Join Date: Nov 2010
Location: Cleveland Georgia
Posts: 5,307
Likes: 0
Received 33 Likes on 24 Posts
Default

Originally Posted by wildbilly32 View Post
No engine expert here but I don't believe that is a chunk missing. The engine was running when sent in. I think Jake would have called if he had found an exploded cylinder liner. Regardless the liners get machined out anyway.
No chunks were missing. That’s a factory windage notch-
This build is coming along well, and as scheduled. We edited more video this past week, and will get it scheduled to be released on the channel.
__________________
Flat 6 Innovations
Inventor of the IMS Solution:
US Patents 8,992,089, 9,416,697 & 9,909,469

Inventor of the Single Row Pro IMS Retrofit, and Faultless Tool with method of installation:
US Patent 9,687,974


www.flat6innovations.com
Engine Failure Hotline- 706-219.4874

M96/ M97/ 9a1 Engine Specialists-
-Extensive Internal Engine Repairs
-Performance Updated Engines

-Engine Rebuild Training Courses
Flat6 Innovations is offline  
The following users liked this post:
Mpfaff (07-08-2019)
Old 07-08-2019, 02:49 PM
  #33  
wildbilly32
User
Thread Starter
 
wildbilly32's Avatar
 
Join Date: Feb 2015
Location: Nebraska
Posts: 1,594
Received 3 Likes on 3 Posts
Default

Engine out and apart. #5 doesn't look good. #6 is toast! Update video from Flat6 Innovations:

wildbilly32 is offline  
Old 07-08-2019, 06:28 PM
  #34  
wildbilly32
User
Thread Starter
 
wildbilly32's Avatar
 
Join Date: Feb 2015
Location: Nebraska
Posts: 1,594
Received 3 Likes on 3 Posts
Default

Some feedback I received: #6 was horribly scored, #5 almost horrible, and #4 just starting. All of that can clearly be seen in the above video. Bore scoring is replacing the IMSB problem but on steroids! I don't wish to sound like an alarmist but if you have one of these cars pay attention to proper recommended maintenance activities/procedures, the engine sounds, tailpipe appearance and oil consumption. The sky is Not falling but information is power so my advice is to soak up as much as possible.
wildbilly32 is offline  
The following users liked this post:
jobyt (07-12-2019)
Old 07-09-2019, 12:45 AM
  #35  
85eurocarrera
User
 
85eurocarrera's Avatar
 
Join Date: Apr 2018
Location: Minnetrista, Mn
Posts: 370
Likes: 0
Received 0 Likes on 0 Posts
Default

[QUOTE=wildbilly32;15959873I don't wish to sound like an alarmist but if you have one of these cars pay attention to proper recommended maintenance activities/procedures, the engine sounds, tailpipe appearance and oil consumption. The sky is Not falling but information is power so my advice is to soak up as much as possible.[/QUOTE]

From what I understand;
Use a good motor oil
Drive off immediately after cold start, keeping rpms at or below 3k until operating temps are reached.
After that, what more can you do?
Thanks for your thread! Very informative! And very jealous of your new motor. 😎
85eurocarrera is offline  
Old 07-09-2019, 09:00 AM
  #36  
wildbilly32
User
Thread Starter
 
wildbilly32's Avatar
 
Join Date: Feb 2015
Location: Nebraska
Posts: 1,594
Received 3 Likes on 3 Posts
Default

Originally Posted by 85eurocarrera View Post
From what I understand;
Use a good motor oil
Drive off immediately after cold start, keeping rpms at or below 3k until operating temps are reached.
After that, what more can you do?
Thanks for your thread! Very informative! And very jealous of your new motor. 😎
Above is a good start. Jake and Flat6 Innovations has produced 8 videos including a FAQ video about bore scoring. There is tons of information in those videos that I can't even come close to recounting here. I would encourage watching and re-watching these videos to absorb all of the things that can help/hurt the engine. I have done this and still miss things that I catch next time through the series. As Jake says you can do all the right stuff and still end up with bore scoring. I say why not do what you can to prevent it.

Disclaimer time(again): I do not work for F6I. I do not have a financial interest in F6I. I am paying for my engine work. I choose F6I from what I read over a period of years and from talking to Jake. They are the best...in my opinion. I am happy to share this journey with the goal of helping people understand the issue. I am excitingly waiting for the return of my car!!
wildbilly32 is offline  
Old 07-10-2019, 07:23 PM
  #37  
10/10ths
User
 
10/10ths's Avatar
 
Join Date: Dec 2015
Posts: 51
Likes: 0
Received 0 Likes on 0 Posts
Default Flat 6 rules!!!!!

I shipped my 2004 Boxster s to Jake and he installed his IMS Solution and a lot of other upgrades for me. I've put 35,000 miles on her since then and it has all been pure joy.
10/10ths is offline  
Old 07-10-2019, 08:50 PM
  #38  
wildbilly32
User
Thread Starter
 
wildbilly32's Avatar
 
Join Date: Feb 2015
Location: Nebraska
Posts: 1,594
Received 3 Likes on 3 Posts
Default Yes they do...

Originally Posted by 10/10ths View Post
I shipped my 2004 Boxster s to Jake and he installed his IMS Solution and a lot of other upgrades for me. I've put 35,000 miles on her since then and it has all been pure joy.
Per you title...Yes, they do rule! I made my decision based on facts and I am completely comfortable that things will be done correctly at F6I.
wildbilly32 is offline  
Old 07-10-2019, 09:22 PM
  #39  
Flat6 Innovations
Basic Sponsor
Rennlist
Site Sponsor

 
Flat6 Innovations's Avatar
 
Join Date: Nov 2010
Location: Cleveland Georgia
Posts: 5,307
Likes: 0
Received 33 Likes on 24 Posts
Default

Originally Posted by 10/10ths View Post
I shipped my 2004 Boxster s to Jake and he installed his IMS Solution and a lot of other upgrades for me. I've put 35,000 miles on her since then and it has all been pure joy.
Thanks for the kind words. You were great to work with :-)
One good thing about the 986 Boxster- they simply do not score bores!
__________________
Flat 6 Innovations
Inventor of the IMS Solution:
US Patents 8,992,089, 9,416,697 & 9,909,469

Inventor of the Single Row Pro IMS Retrofit, and Faultless Tool with method of installation:
US Patent 9,687,974


www.flat6innovations.com
Engine Failure Hotline- 706-219.4874

M96/ M97/ 9a1 Engine Specialists-
-Extensive Internal Engine Repairs
-Performance Updated Engines

-Engine Rebuild Training Courses
Flat6 Innovations is offline  
Old 07-10-2019, 09:50 PM
  #40  
Mike Mullins
Addict
Rennlist Member
 
Mike Mullins's Avatar
 
Join Date: Jul 2002
Location: Cincinnati, OH
Posts: 604
Likes: 0
Received 2 Likes on 2 Posts
Default Can you elaborate on Boxster motor

Originally Posted by Flat6 Innovations View Post
Thanks for the kind words. You were great to work with :-)
One good thing about the 986 Boxster- they simply do not score bores!

possible reason for no issues on 2.5, 2.7 3.2 motors?

just curious,

Thanks
Mike
Mike Mullins is offline  
Old 07-10-2019, 09:54 PM
  #41  
wildbilly32
User
Thread Starter
 
wildbilly32's Avatar
 
Join Date: Feb 2015
Location: Nebraska
Posts: 1,594
Received 3 Likes on 3 Posts
Default

Originally Posted by Flat6 Innovations View Post
Thanks for the kind words. You were great to work with :-)
One good thing about the 986 Boxster- they simply do not score bores!
SURE!!! Now you tell me!!!
wildbilly32 is offline  
Old 07-10-2019, 09:55 PM
  #42  
Flat6 Innovations
Basic Sponsor
Rennlist
Site Sponsor

 
Flat6 Innovations's Avatar
 
Join Date: Nov 2010
Location: Cleveland Georgia
Posts: 5,307
Likes: 0
Received 33 Likes on 24 Posts
Default

Originally Posted by Mike Mullins View Post
possible reason for no issues on 2.5, 2.7 3.2 motors?

just curious,

Thanks
Mike
These engines do not use forged pistons, lack ferrostan piston coating, and have more open running clearances. They also have better stroke/ bore ratios, as well as rod/ stroke ratios, and a slew of other benefits.
__________________
Flat 6 Innovations
Inventor of the IMS Solution:
US Patents 8,992,089, 9,416,697 & 9,909,469

Inventor of the Single Row Pro IMS Retrofit, and Faultless Tool with method of installation:
US Patent 9,687,974


www.flat6innovations.com
Engine Failure Hotline- 706-219.4874

M96/ M97/ 9a1 Engine Specialists-
-Extensive Internal Engine Repairs
-Performance Updated Engines

-Engine Rebuild Training Courses
Flat6 Innovations is offline  
Old 07-12-2019, 01:37 AM
  #43  
Dom991.1
Addict
Rennlist Member
 
Dom991.1's Avatar
 
Join Date: Aug 2016
Posts: 716
Likes: 0
Received 3 Likes on 3 Posts
Default

Originally Posted by Flat6 Innovations;[url=tel:15965243
15965243[/url]]These engines do not use forged pistons, lack ferrostan piston coating, and have more open running clearances. They also have better stroke/ bore ratios, as well as rod/ stroke ratios, and a slew of other benefits.
So the Boxster motors did not use forged pistons but the 911 did?!? Does it just go by the displacement of the motor? I know you show a number of variables but is the displacement a common denominator? I’ve watched the ‘bore scoring’ series (great stuff), just thought still trying to figure out which motors/years/models were best to AVOID this issue. Thank you for weighing in! -Dom
Dom991.1 is offline  
Old 07-12-2019, 01:44 AM
  #44  
Flat6 Innovations
Basic Sponsor
Rennlist
Site Sponsor

 
Flat6 Innovations's Avatar
 
Join Date: Nov 2010
Location: Cleveland Georgia
Posts: 5,307
Likes: 0
Received 33 Likes on 24 Posts
Default

Originally Posted by Dom991.1 View Post
So the Boxster motors did not use forged pistons but the 911 did?!? Does it just go by the displacement of the motor? I know you show a number of variables but is the displacement a common denominator? I’ve watched the ‘bore scoring’ series (great stuff), just thought still trying to figure out which motors/years/models were best to AVOID this issue. Thank you for weighing in! -Dom
The Boxster never shared the displacement of the 911, until 2007 when it became a 3.4 engine, when the Boxster S got the M97.21 Cayman S Engine. The 07 and 08 Boxster are the only Boxster engines that are scored bores.

its not a displacement issue, it’s an engine designation issue. There’s 17 engine designations in the M9X engine family.

Basically any 986 is safe from bore scoring, as well as any 987 base (2.7) or Boxster S 987 from 2005 and 2006, with M96.25 and M96.26 engine designations.
Flat6 Innovations is offline  
The following users liked this post:
I am the Walrus (07-12-2019)
Old 07-12-2019, 01:49 AM
  #45  
Dom991.1
Addict
Rennlist Member
 
Dom991.1's Avatar
 
Join Date: Aug 2016
Posts: 716
Likes: 0
Received 3 Likes on 3 Posts
Default

Originally Posted by Flat6 Innovations View Post
The Boxster never shared the displacement of the 911, until 2007 when it became a 3.4 engine, when the Boxster S got the M97.21 Cayman S Engine. The 07 and 08 Boxster are the only Boxster engines that are scored bores.

its not a displacement issue, it’s an engine designation issue. There’s 17 engine designations in the M9X engine family.

Basically any 986 is safe from bore scoring, as well as any 987 base (2.7) or Boxster S 987 from 2005 and 2006, with M96.25 and M96.26 engine designations.
That’s great detail - thank you for that response!
Dom991.1 is offline  

Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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: