LWFW Installed...Impressions
05-28-2009, 11:03 PM
#61
Three Wheelin'
Thread Starter
Hi Steve. The rod is definately an option, thanks...I'm going to try the easy way first.
Mark, I am hoping to get my A/C system charged tomorrow. I have not had it on, since the LWFW was installed. I have read that the noise gets worse with the A/C on, so I am anxious to find out.
Mark, I am hoping to get my A/C system charged tomorrow. I have not had it on, since the LWFW was installed. I have read that the noise gets worse with the A/C on, so I am anxious to find out.
05-29-2009, 01:53 PM
#62
[QUOTE=Mfletch]
"When the clutch pedal is mashed to the floor, the pressure plate goes too far and contacts the spring centered hub of the clutch. If I back off on the pressure, it goes away. It can be felt through the clutch pedal."
Mfletch, It sounds like the spring hub disc has been mounted in the wrong direction. The correct placement of the spring unit is toward the flywheel, the manufacturer should have indicated the direction on the part. You should have absolutely no issues with pedal travel (going over center) or modifications to your system what so ever.
regards drdooba1
"When the clutch pedal is mashed to the floor, the pressure plate goes too far and contacts the spring centered hub of the clutch. If I back off on the pressure, it goes away. It can be felt through the clutch pedal."
Mfletch, It sounds like the spring hub disc has been mounted in the wrong direction. The correct placement of the spring unit is toward the flywheel, the manufacturer should have indicated the direction on the part. You should have absolutely no issues with pedal travel (going over center) or modifications to your system what so ever.
regards drdooba1
05-29-2009, 03:00 PM
#63
Drifting
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I don't know if you only want to hear from Mfletch but I have no issues with my LWFW when the AC is on or off except for the chattering sound which does get louder when the AC is on.
Mfletch,
Does your car have A/C still? Have you driven with the A/C on with the new LWFW? I ask because I did that same mod to a '93 RS America (right after the new car warranty expired) and the engine would stall when I pushed in the clutch to coast to a stop if I had the A/C on. I had Weltmeister recurve a chip to bring on the onset of idle at a higher RPM to prevent the stall. Just wondering if you have notice any stalling with the A/C on. My experience was 15 years ago on a two generations older car, but I was just curious if you have had that problem.
Does your car have A/C still? Have you driven with the A/C on with the new LWFW? I ask because I did that same mod to a '93 RS America (right after the new car warranty expired) and the engine would stall when I pushed in the clutch to coast to a stop if I had the A/C on. I had Weltmeister recurve a chip to bring on the onset of idle at a higher RPM to prevent the stall. Just wondering if you have notice any stalling with the A/C on. My experience was 15 years ago on a two generations older car, but I was just curious if you have had that problem.
05-30-2009, 09:15 PM
#66
Three Wheelin'
Thread Starter
drbooba1, your explanation of the problem sounds like a possibility. I tried a spacer behind the clutch pedal, to limit travel. I have to mash the pedal to the floor, to activate the microswitch on the clutch pedal, in order to start the car. It makes that horrible contact noise when I start the car, with the pedal fully depressed (after it is warm).
Has anybody else ever heard of this problem? Did my mechanic install the clutch backwards?
Has anybody else ever heard of this problem? Did my mechanic install the clutch backwards?
05-31-2009, 12:12 AM
#68
Burning Brakes
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drbooba1, your explanation of the problem sounds like a possibility. I tried a spacer behind the clutch pedal, to limit travel. I have to mash the pedal to the floor, to activate the microswitch on the clutch pedal, in order to start the car. It makes that horrible contact noise when I start the car, with the pedal fully depressed (after it is warm).
Has anybody else ever heard of this problem? Did my mechanic install the clutch backwards?
Has anybody else ever heard of this problem? Did my mechanic install the clutch backwards?
I have heard of the rattling associated with the lightweights but you really should not have to be using bandades here. It may give you piece of mind to take it back and see what he says and if he has done the job a few times I would imagine he can remove tranny pretty fast.
05-31-2009, 12:51 AM
#69
Three Wheelin'
Thread Starter
Ray and Steve, thanks for the response. This is not a noise associated with the LWFW. You can hear and feel the splines on the pressure plate contacting the spring centered hub, when the pedal is depressed all the way (hard) to the floor.
Steve, you are right about the bandaid fix...it is not the way to go. My mechanic does primarily Shelby products. This is the first 996 clutch that he has done. If it is possible to reverse the clutch, that explains what is happening.
Steve, you are right about the bandaid fix...it is not the way to go. My mechanic does primarily Shelby products. This is the first 996 clutch that he has done. If it is possible to reverse the clutch, that explains what is happening.
05-31-2009, 11:59 AM
#70
Former Vendor
Two motors in less than 2 months. Assco LWF and Spec clutch. First motor looks like the thrust bearing is gone. Second motor broken crank shaft. Sent the flywheel back to Assco to be repaired and rebalanced had to replace the clutch, repair the bellhousing where the flywheel hit it multilple times and obviously replace the motor. From what I hear the 3rd time is a charm!!!!
Along the way we have net worked with Jake Raby regarding the problems with both of Tim's engine. When we started Tim's engine rebuild first we sent the fly wheel to Assco for repair they did a great job and got it back to us in three days, the next thing we checked was the balance of the rotating assembly it was 16 grams out of balance that is just mind blowing. We think that the dull mass flywheel is used as a harmonic balancer to offset the pore balancing I would say if you are using a single mass flywheel you should have the motor rebalanced before using, that is just are opinion based on our finding so fare. Jake Raby has also found the same problem with these motors that we have. We re balanced the rotating assembly with in 2 tenths of a gram, made some changes to the stock pistons to make the rings seal better.
A friend of mine at the local Porsche dealer called me and told us about a new Porsche tech bulletin, it states if you use a single mass flywheel it will fractures the crank shaft.
05-31-2009, 12:10 PM
#71
05-31-2009, 12:20 PM
#72
Drifting
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[QUOTE=SSI Performance;6610939]Tim is back on the track this week end with a new rebuilt motor at the Glen with PCA, he will be testing some new changes we made to the stock internals.
Along the way we have net worked with Jake Raby regarding the problems with both of Tim's engine. When we started Tim's engine rebuild first we sent the fly wheel to Assco for repair they did a great job and got it back to us in three days, the next thing we checked was the balance of the rotating assembly it was 16 grams out of balance that is just mind blowing. We think that the dull mass flywheel is used as a harmonic balancer to offset the pore balancing I would say if you are using a single mass flywheel you should have the motor rebalanced before using, that is just are opinion based on our finding so fare. Jake Raby has also found the same problem with these motors that we have. We re balanced the rotating assembly with in 2 tenths of a gram, made some changes to the stock pistons to make the rings seal better.
A friend of mine at the local Porsche dealer called me and told us about a new Porsche tech bulletin, it states if you use a single mass flywheel it will fractures the crank shaft.[/QUOTE]
Well that sucks to know.
Along the way we have net worked with Jake Raby regarding the problems with both of Tim's engine. When we started Tim's engine rebuild first we sent the fly wheel to Assco for repair they did a great job and got it back to us in three days, the next thing we checked was the balance of the rotating assembly it was 16 grams out of balance that is just mind blowing. We think that the dull mass flywheel is used as a harmonic balancer to offset the pore balancing I would say if you are using a single mass flywheel you should have the motor rebalanced before using, that is just are opinion based on our finding so fare. Jake Raby has also found the same problem with these motors that we have. We re balanced the rotating assembly with in 2 tenths of a gram, made some changes to the stock pistons to make the rings seal better.
A friend of mine at the local Porsche dealer called me and told us about a new Porsche tech bulletin, it states if you use a single mass flywheel it will fractures the crank shaft.[/QUOTE]
Well that sucks to know.
05-31-2009, 01:55 PM
#74
Thanks, I have checked all available TSBs on Renntech and saw no new flywheel related TSB...It would be nice to know this to be true rather than start an ugly rumor. After all there are lots of Porsches running LWFW with NO issues.
05-31-2009, 02:35 PM
#75
Burning Brakes
The 3.6 crank now has 7 revisions that have been made to it by Porsche... That alone says there is a problem.
We have known that the use of the single mass flywheel can lead to fractured cranks for over a year now, but of course what do a few engine developers from America know?? People won't listen and will argue until Porsche releases a bulletin MONTHS after the issues have occurred..
One day people will listen and they will do so without denial or argument, but wait that would be in a "Perfect World"...
Sloan noted the same imbalance that we have when balancing assemblies and flywheels here under our roof, these are the instances that I have based my tech article on that I have ben waiting to release. Now that Porsche has released their bulletin it looks like I can finish the article and post it without receiving emails from those who doubt it's validity..
I enjoyed working with SSI on Tim's engine and getting him back on the track. Its nice to work with people who have the same experiences that we have..
Sloan, I need some pics of Tim's broken crank to add to my article as well as a copy of the"initial spin" balance screen from your balancer's computer.. I will have more data and broken parts than anyone can argue with once this article is completed... Send me that TSB if you can and I'll post it in the article as well, I only have it in the form of a copy/paste email.
Thanks to the Fatherland for finally waking up on this topic, it's only been a few years now that these cranks have been breaking..
The answer is a real crank-
We have known that the use of the single mass flywheel can lead to fractured cranks for over a year now, but of course what do a few engine developers from America know?? People won't listen and will argue until Porsche releases a bulletin MONTHS after the issues have occurred..
One day people will listen and they will do so without denial or argument, but wait that would be in a "Perfect World"...
Sloan noted the same imbalance that we have when balancing assemblies and flywheels here under our roof, these are the instances that I have based my tech article on that I have ben waiting to release. Now that Porsche has released their bulletin it looks like I can finish the article and post it without receiving emails from those who doubt it's validity..
I enjoyed working with SSI on Tim's engine and getting him back on the track. Its nice to work with people who have the same experiences that we have..
Sloan, I need some pics of Tim's broken crank to add to my article as well as a copy of the"initial spin" balance screen from your balancer's computer.. I will have more data and broken parts than anyone can argue with once this article is completed... Send me that TSB if you can and I'll post it in the article as well, I only have it in the form of a copy/paste email.
Thanks to the Fatherland for finally waking up on this topic, it's only been a few years now that these cranks have been breaking..
The answer is a real crank-