Flywheel bolt torque?

[JFP in PA]

Originally Posted by PorscheFan5

JFP and Team,

I finally have my adapter plate in my Boxster EV conversion and am going to be assembling the drive train - DC Motor + DMFW (stock) + Clutch Plate (stock) + 5 spd Tx (Stck).

Researched and found the below post and details from JFP on torque specs: FW - 19ftlbs+120deg, Clutch plate - 17ftlbs. Thanks!

What about balancing? I have no tools for balancing... Should I be worried about it given I will be using my Warp 9 DC motor and not the engine?

Please advise. Thanks!

Porsche factory components are "somewhat" balanced, but probably not to the RPM levels the electric motor can turn. You might want to consider having an engine balancing shop true yours up.

[Meir]

just for future reference.
final torque on DMFW should be 90 degrees and not 120.
in the 101 book there is a mistake that was copied from the Bentley book.
in the Bentley book it say 90 in one project and 120 in another.

this is from the shop manual.

[JFP in PA]

Originally Posted by Meir

just for future reference.
final torque on DMFW should be 90 degrees and not 120.
in the 101 book there is a mistake that was copied from the Bentley book.
in the Bentley book it say 90 in one project and 120 in another.

this is from the shop manual.

And for your reference, the was a later supplement to the Porsche service manual (a3050371, dated 2002) which reads:

"25 Nm(19 ft. lb.) plus 120 degrees."

That later data remains current according to Porsches electronic information system, PIWIS TSI.

[78F350]

Originally Posted by JFP in PA

And for your reference, the was a later supplement to the Porsche service manual (a3050371, dated 2002) which reads:

"25 Nm(19 ft. lb.) plus 120 degrees."

That later data remains current according to Porsches electronic information system, PIWIS TSI.

Always makes me feel good when my manual agrees with JFP.

[Meir]

Originally Posted by 78F350

Always makes me feel good when my manual agrees with JFP.

i stand correct, as the manual i have is from 98.

[JFP in PA]

Originally Posted by Meir

i stand correct, as the manual i have is from 98.

You should check around and see if anyone is selling the supplements, there were over 100 of them for the 986's, some with as many as a dozen individual pages.

[PorscheFan5]

I found a good shop that can do the balancing.

Question: Does anyone know if the Boxtser 2.7L engine is internally balanced or externally balanced? The shop owner (it is a racing shop), who is quite knowledgeable, asked the question...

Cheers.

[PorscheFan5]

JFP,

Thanks for your response. Therefore if I can find a DMF for and S model, would that work too? Is the fitment and diameter same or different? Can I use my exisiting Clutch with an S-FW? Or do I need to change clutch too?

Appreciate all the help! Thanks!

[PorscheFan5]

Originally Posted by JFP in PA

Porsche factory components are "somewhat" balanced, but probably not to the RPM levels the electric motor can turn. You might want to consider having an engine balancing shop true yours up.

JFP,

I checked with a local Machine Shop and they indicated that they balance at 500 RPMs and that's it. They indicated that that is what most shops will do. Given that then does it still make sense on spending $150 and taking the DMFW to the shop to zero balance at 500 rpm?

Separate question, how do people know that their FW is worn out and they need a new FW? My Boxster has 59K miles on it. To me the FW looks pretty good. Also With the EV I am not going to be shifting much and hence the FW (and Clutch) won't wear down as much. How do I make sure that I have reasonably ok FW? If I post some pictures, could someone who knows this stuff make out or it has to be physically examined?

Sorry of my questions are real basic...

[JFP in PA]

Originally Posted by PorscheFan5

JFP,

I checked with a local Machine Shop and they indicated that they balance at 500 RPMs and that's it. They indicated that that is what most shops will do. Given that then does it still make sense on spending $150 and taking the DMFW to the shop to zero balance at 500 rpm?

Separate question, how do people know that their FW is worn out and they need a new FW? My Boxster has 59K miles on it. To me the FW looks pretty good. Also With the EV I am not going to be shifting much and hence the FW (and Clutch) won't wear down as much. How do I make sure that I have reasonably ok FW? If I post some pictures, could someone who knows this stuff make out or it has to be physically examined?

Sorry of my questions are real basic...

Try a better balancing shop. In any case, even lower RPM balancing is better than not.

There is a standard factory test for the dual mass that measures twist of the elastomeric component. Porsche has released a Technical Service Bulletin on checking the dual-mass flywheel (TSB 911 8/02 1360). Basically, you are looking for a maximum of 15MM movement between the segment's.

Here is the bulletin for the 996, which is basically the same: http://www.pelicanparts.com/techarticles/Boxster_Tech/44-TRANS-Clutch/DualFlywheelTechBulletin.pdf

[PorscheFan5]

Thanks JFP!

When I read your response, I said great, now I can check my FW. Then I said wait, it said twist and how am I supposed to twist it? Rather than ask the stupid question on the forum I searched youtube and found my answer...

https://www.youtube.com/watch?v=uLp6nlYMssA

I will check it out. Also will check another machine shop.

Cheers for now.