My spun camshaft story
#91
Race Director
Join Date: Oct 2004
Location: KC ex pat marooned in NY
Posts: 13,005
Likes: 0
Received 17 Likes
on
17 Posts
"Emotionally bound to what you currently own? " Pot calling the kettle black.
It must be boring over on the 991tt board these days, why not just let us have our fun, you have so much to teach the newbs over there who just dropped 200k and looking to mod, they need you (much) more than we do
JK Paul, (you know you love bantering with us), before you start your manifesto....
It must be boring over on the 991tt board these days, why not just let us have our fun, you have so much to teach the newbs over there who just dropped 200k and looking to mod, they need you (much) more than we do
JK Paul, (you know you love bantering with us), before you start your manifesto....
#92
It must be boring over on the 991tt board these days, why not just let us have our fun, you have so much to teach the newbs over there who just dropped 200k and looking to mod, they need you (much) more than we do
JK Paul, (you know you love bantering with us), before you start your manifesto....
JK Paul, (you know you love bantering with us), before you start your manifesto....
PS and re the boring remarks on the 991tt forum you have a point. I guess nothing is breaking or breaking down so we all just talk about silly wheels and paint jobs and about driving them and trying to mod them to break them but they still wont break dammit!!
#93
M42Racer, we just aren't seeing these crankshaft failures with the 997.1TT engine. I have personally seen 2 cranks break with the 996TT platform and heard of 2 other engines.. 2 of 4 engines were tracked. The GT3 engine has suffered other issues with the pulley and such.
We would have seen Porsche install a harmonic dampener to the pulley if they felt that it was an issue. One in 1000 failure is more of chance. It's easier to place the blame on a missed shift vs a crankshaft breakage. Again, I agree that a "few" crankshaft failures occur but so do timing chain breakage and vario-cam module failures, cylinder head casting porosity and other manufacturing errors. On this platform I have NOT seen an oil pump gear failure.
We would have seen Porsche install a harmonic dampener to the pulley if they felt that it was an issue. One in 1000 failure is more of chance. It's easier to place the blame on a missed shift vs a crankshaft breakage. Again, I agree that a "few" crankshaft failures occur but so do timing chain breakage and vario-cam module failures, cylinder head casting porosity and other manufacturing errors. On this platform I have NOT seen an oil pump gear failure.
I got more info and some ideas that could be contributing to the problem. He asked me to find out if the problem was concentrated with the Intake cam on the RHS of the engine. He told me that this timing chain is "shorter" than the LHS in its fitment and could be contributing to the turning effect as well. He said that in assembling the chain on the RHS, it requires some leverage to fit, unlike the LHS. If the failures are happening in the RHS only, this could also be a contributor to the cause. It could be putting the sleeve under some side loading.
However, he told me they have seen many issues with the Turbo engines. I guess it comes down to how many you come in contact with.
#94
Rennlist Member
Are the 9a1 pistons in swappable sleeves or bored into the block material?
#95
#96
Three Wheelin'
and in this post you can see a picture of the cylinder :
https://rennlist.com/forums/997-foru...ability-7.html
#97
Rennlist Member
http://www.total911.com/wp-content/u...ction-main.jpg
and in this post you can see a picture of the cylinder :
https://rennlist.com/forums/997-foru...ability-7.html
and in this post you can see a picture of the cylinder :
https://rennlist.com/forums/997-foru...ability-7.html
Thanks, Denis. Let me put my question another way. I thought that during a rebuild, the sleeves in the blocks on the Mergers were liners, and were thus removed and replaced. On the 9A1's, the block has to be rebored and recoated with nikasil. True or false?
#98
9A1 from the book Porsche 911 (997), All models 2004-2012:
"The cylinders now also featured a stronger closed deck design with the liners actually attached to the coolant sleeve's top plate. This created a stronger (22% stiffer than before), more stable cylinder design while also reducing oil consumption"
#100
Rennlist Member
Thread Starter
Back to the original topic..
Rhonda from FVD told me today that Porsche performs an "update" to the ECU when the dealer does work for the camshaft issue.. I confirmed it to the extent that my FVD tune will no longer load due to it being "incompatible" with my ECU..
Those of you who had a dealer replace your cams, if you run a tune have you run into this before?
I'm working on getting a new file..
Rhonda from FVD told me today that Porsche performs an "update" to the ECU when the dealer does work for the camshaft issue.. I confirmed it to the extent that my FVD tune will no longer load due to it being "incompatible" with my ECU..
Those of you who had a dealer replace your cams, if you run a tune have you run into this before?
I'm working on getting a new file..
#101
Pro
Back to the original topic..
Rhonda from FVD told me today that Porsche performs an "update" to the ECU when the dealer does work for the camshaft issue.. I confirmed it to the extent that my FVD tune will no longer load due to it being "incompatible" with my ECU..
Those of you who had a dealer replace your cams, if you run a tune have you run into this before?
I'm working on getting a new file..
Rhonda from FVD told me today that Porsche performs an "update" to the ECU when the dealer does work for the camshaft issue.. I confirmed it to the extent that my FVD tune will no longer load due to it being "incompatible" with my ECU..
Those of you who had a dealer replace your cams, if you run a tune have you run into this before?
I'm working on getting a new file..
#102
Addict
Rennlist Member
Rennlist
Site Sponsor
Rennlist Member
Rennlist
Site Sponsor
It is always BEST to flash your ECU back to stock when taking your car into a Porsche dealer for service. Most tuning systems allow for this.. Stock and tuned files with tuning interface.
Specific Answer>> Not all Porsche dealers will rewrite the ECU. I just talked to a Rennlister today and "his" did not get reflashed while having the cams repaired.
Specific Answer>> Not all Porsche dealers will rewrite the ECU. I just talked to a Rennlister today and "his" did not get reflashed while having the cams repaired.
#103
Rennlist Member
Back to the original topic..
Rhonda from FVD told me today that Porsche performs an "update" to the ECU when the dealer does work for the camshaft issue.. I confirmed it to the extent that my FVD tune will no longer load due to it being "incompatible" with my ECU..
Those of you who had a dealer replace your cams, if you run a tune have you run into this before?
I'm working on getting a new file..
Rhonda from FVD told me today that Porsche performs an "update" to the ECU when the dealer does work for the camshaft issue.. I confirmed it to the extent that my FVD tune will no longer load due to it being "incompatible" with my ECU..
Those of you who had a dealer replace your cams, if you run a tune have you run into this before?
I'm working on getting a new file..
#104
Rennlist Member
Thread Starter
It is always BEST to flash your ECU back to stock when taking your car into a Porsche dealer for service. Most tuning systems allow for this.. Stock and tuned files with tuning interface.
Specific Answer>> Not all Porsche dealers will rewrite the ECU. I just talked to a Rennlister today and "his" did not get reflashed while having the cams repaired.
Specific Answer>> Not all Porsche dealers will rewrite the ECU. I just talked to a Rennlister today and "his" did not get reflashed while having the cams repaired.
I decided to flash it back to the tuned file today and THEN thats when I got the ECU incompatible message..
Scott, did you get your car repaired at a dealer or indy?
#105
Rennlist Member
Maybe I wasn't clear.. it WAS on the original stock file when I took it to the dealer.. I actually had been using the stock file for about 3 months prior to the CEL for the cam issue..
I decided to flash it back to the tuned file today and THEN thats when I got the ECU incompatible message..
Scott, did you get your car repaired at a dealer or indy?
I decided to flash it back to the tuned file today and THEN thats when I got the ECU incompatible message..
Scott, did you get your car repaired at a dealer or indy?