986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Why doesn't anyone make a near-normal weight single mass flywheel?

JoeFromPA · 08-04-2010, 07:24 AM

JFP -

Thanks so much. That is exactly the type of information I was looking for...

I'm guessing that Porsche uses a metallurgy in their crankshaft that allows them to break under such stresses. This isn't a criticism; they designed the crank to be used with a specific flywheel and provide longevity.

Perhaps it is the specific application of a solid-mass aluminum+steel flywheel that's less than 1/2 the weight of the stock dual-mass flywheel on this particular crankshaft....I haven't seen/heard cranks breaking as even a concern when switching back and forth between single mass/dual-mass on an otherwise stock rotating assembly.

Reading Jake's comments, I understand now why a vendor hasn't chosen to develop a 25+ pound single-mass flywheel for these engines. It's just not a choice they want to entertain, given the available options.

08-04-2010, 07:24 AM	#11
JoeFromPA Registered User Join Date: Jul 2010 Location: West Chester, PA Posts: 211	JFP - Thanks so much. That is exactly the type of information I was looking for... I'm guessing that Porsche uses a metallurgy in their crankshaft that allows them to break under such stresses. This isn't a criticism; they designed the crank to be used with a specific flywheel and provide longevity. Perhaps it is the specific application of a solid-mass aluminum+steel flywheel that's less than 1/2 the weight of the stock dual-mass flywheel on this particular crankshaft....I haven't seen/heard cranks breaking as even a concern when switching back and forth between single mass/dual-mass on an otherwise stock rotating assembly. Reading Jake's comments, I understand now why a vendor hasn't chosen to develop a 25+ pound single-mass flywheel for these engines. It's just not a choice they want to entertain, given the available options.