06-11-2015, 09:28 AM
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#21
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Registered User
Join Date: Dec 2014
Location: California
Posts: 246
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JFP and others,
In my case where I am doing an Electric conversion of my 2004 Boxster, I wont have the engine but the DC motor. In this case should I keep the stock Flywheel or go for a LW one? What do you guys think? Somewhere I read that people changed it to LW one in an electric conversion but cannot find it now. Note that I will be mostly driving in 2nd or 3rd gear and the RPM will be anyway high.
BTW, if I am driving at highway speeds in 3rd gear, how high will the RPM be? I am thinking of using the stock RPM sensor and stock RPM meter in the dash. Just wondering if I will go out of the meter range...
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08-09-2018, 10:43 AM
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#22
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,446
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revival of an old thread.
Now, three years removed from these posts, do any of you who are still here have any further recommendations regarding the Lightweight Flywheel & Sprung Clutch?
Stone?
Any others here with First-Hand knowledge who can share your experiences?
I understand the issue of balancing. I've built some very high-revving engines & I know the sort of harmonics that can occur.
What I DON't have, is experience with these cases, and what sort of abuse they'll tolerate.
I see some reports of crankshaft failure, but none are attributable to someone's first-hand experience. All are "I've heard of ....". Whereas I see several posters saying they have run the LWFW for upwards of 45k miles, with no issues.
Just looking for some experience to chime-in, before I make any sorts of decisions here.
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08-09-2018, 12:47 PM
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#23
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Custom User Title Here
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,164
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If you look hard enough, Jake Raby has posted first hand results of busted cranks from LWFWs.
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08-09-2018, 01:09 PM
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#24
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Quote:
Originally Posted by thstone
I am up to about 62,000 miles and 94 track days and I am on the 2nd clutch (same LWFW) without a problem.
And as always, your mileage may vary.
Maybe I am lucky with clutches and unlucky with valve lifters. ![Smilie](http://www.986forum.com/forums/images/smilies/smile.gif)
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** Update **
Total of 5 years, 140 track days incl 60 races, and four engines.
Still zero problems due to LWFW.
YMMV.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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08-09-2018, 01:25 PM
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#25
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,446
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Quote:
Originally Posted by thstone
** Update **
Total of 5 years, 140 track days incl 60 races, and four engines.
Still zero problems due to LWFW.
YMMV.
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this is goood.... :-)
So, the benefit of the LWFW is clear to you, then?
My car is still primarily a street car; is the added noise from the trans noticeable?
And driveability? I've driven lots of lightened flywheels before, (none in a Porsche) so I understand the need to rev more from a start, etc. But any other driveability issues?
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08-09-2018, 01:32 PM
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#26
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,446
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Quote:
Originally Posted by particlewave
If you look hard enough, Jake Raby has posted first hand results of busted cranks from LWFWs.
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still looking... can't find it.
I see where it looks like he MAY have posted a photo of it once, but no photo there any longer.
I'll keep looking. BUT I'll be honest; after reading a ton of his posts on this topic and a couple others, the guy clearly has his own agenda in what he writes, so it's a little hard to take what he's writing as unbiased, first-hand-experience. He certainly has more knowledge and experience than I do, though.
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08-09-2018, 01:48 PM
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#27
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Custom User Title Here
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,164
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Quote:
Originally Posted by maytag
still looking... can't find it.
I see where it looks like he MAY have posted a photo of it once, but no photo there any longer.
I'll keep looking. BUT I'll be honest; after reading a ton of his posts on this topic and a couple others, the guy clearly has his own agenda in what he writes, so it's a little hard to take what he's writing as unbiased, first-hand-experience. He certainly has more knowledge and experience than I do, though.
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You won't get any argument from me on that!
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08-09-2018, 01:53 PM
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#28
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Custom User Title Here
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,164
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It seems he's removed the post from his site, but here are the pictures that google has saved:
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08-09-2018, 03:58 PM
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#29
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Rennzenn
Join Date: Feb 2005
Location: Virginia
Posts: 1,369
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I installed the LWFW at 142000. At 189000 no problem with that ( do have a cracked head). 9 years of competitive autocrossing and all of the beating that goes with it.
__________________
Rennzenn
Jfro@rennzenn.com
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08-09-2018, 04:41 PM
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#30
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Quote:
Originally Posted by maytag
this is goood.... :-)
So, the benefit of the LWFW is clear to you, then?
My car is still primarily a street car; is the added noise from the trans noticeable?
And driveability? I've driven lots of lightened flywheels before, (none in a Porsche) so I understand the need to rev more from a start, etc. But any other driveability issues?
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Yes, its all good! Five years of racing Boxster's has been hugely rewarding! Engines (for me) are wear items just like tires and brakes. Some engines have lasted longer than others, but none of my engines failed due to anything related to the LWFW.
Some noise from the trans might be noticeable with the top down and the clutch out. Push in the clutch, no more noise. Top up, not noticeable. Otherwise, no drivability issues, just a little quicker to rev.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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08-09-2018, 04:44 PM
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#31
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Quote:
Originally Posted by particlewave
It seems he's removed the post from his site, but here are the pictures that google has saved:
![](http://986forum.com/forums/uploads02/IMG_90261533851563.jpg)
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Do you know if those photos are from a Boxster? My memory wants to say that is a 996 engine but ... I'm lucky to remember my home address these days.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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08-09-2018, 05:12 PM
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#32
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Custom User Title Here
Join Date: Mar 2012
Location: Ft. Leonard Wood
Posts: 6,164
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I don't recall, just that it was an M96 with a lightweight flywheel.
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08-10-2018, 03:12 PM
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#33
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by Krieger
So how about lightening the stock dual mass flywheel a couple pounds?
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I have my dual mass flywheels balanced before install, but there's not a lot of room for lightening holes & still maintain dynamic balance.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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08-10-2018, 03:45 PM
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#34
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Registered User
Join Date: Aug 2005
Location: Sanford NC
Posts: 2,548
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Pray tell what benefit would Jake have re the dual mass versus lightweight flywheel choice. He makes neither so no financial incentive. And since he has been inside more failed engines than most posters here, he just might have some insight. That PCNA advises against it in a TSB also adds to the weight of the dual recommendation. Maybe if you have rebuilt your engine and balanced it to a micro ounce or if you just happened to get one balanced that way from the factory, you may be in the group that has a positive experience with the light weight flywheel. Or not...
Your car, your money, your choice.
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08-10-2018, 03:54 PM
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#35
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Registered User
Join Date: Feb 2015
Location: QC
Posts: 412
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Isn’t there a harmonic balancer pulley available for the M96?
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08-10-2018, 05:58 PM
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#36
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,371
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Quote:
Originally Posted by WillH
Isn’t there a harmonic balancer pulley available for the M96?
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Yes, but it is not equivalent to the action of the dual mass flywheel.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-12-2018, 08:03 AM
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#37
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So Blessed!
Join Date: Nov 2016
Location: SE Georgia
Posts: 389
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Porsche wanted the lightest crank they could have and those cranks cannot stand the huge torques both in Revs and downshifting loads. Many light weight flywheels installed have caused the cranks to fail.
__________________
Artic Silver Boxster S - Black Leather - Black Top - Convience Plus Package
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08-12-2018, 09:18 AM
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#38
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,446
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Quote:
Originally Posted by Lew
Many light weight flywheels installed have caused the cranks to fail.
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Can you cite more than one?
In the WHOLE of the internet, I can find only one.
Please, show me "many".
Sent from my SM-G930T using Tapatalk
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08-12-2018, 10:17 AM
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#39
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,371
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Quote:
Originally Posted by maytag
Can you cite more than one?
In the WHOLE of the internet, I can find only one.
Please, show me "many".
Sent from my SM-G930T using Tapatalk
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We have seen a couple, but also do not post everything we see on the web.....
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-12-2018, 10:22 AM
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#40
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So Blessed!
Join Date: Nov 2016
Location: SE Georgia
Posts: 389
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Which one are you talking about Maytag? I remember reading a couple of articles about the reason cranks broke, and others that spoke of hearing about broken cranks that were light flywheel related were in a public conversation. I somewhat remember the article I read, and if I can find it, I will post it up for you to read. If it's a different article that you mention, that's two of the many.
__________________
Artic Silver Boxster S - Black Leather - Black Top - Convience Plus Package
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