[DRACO A5OG]

Thanks Brother Kevin!

You saved me a bit of dough

Originally Posted by KTL

wayner's issue is why the larger cranks (70.4mm stroke & larger) eventually were revised to add 3 more bolts for a total of 9?

I thought the fear of the flywheel bolts started with the 6 bolt 70.4mm cranks that would loosen up their bolts due to harmonics and that gets ugly real fast. So guys started using high strength/red threadlocker and even over-tightening them. They can over-tighten them because the recommended torque spec. was much lower than the bolt was capable of (12.9 class bolt) and the forged crank material can handled the additional stress on the receiving threads, I assume?

Here's the instructions for the 9 bolt ARP bolts right from ARP. But don't use these instructions for regular OEM Porsche Verbus/Inbus bolts (also very high quality), which are plenty sufficient for a stock engine even when used hard. All the cars in our "fleet" of locals who've tracked them a lot for over 10 years have never had an issue with original flywheel bolts

http://arpinstructions.com/instructions/204-2801.pdf






I wouldn't safety wire them mostly because they're spaced so closely together and you'd have a real hard time routing your wire. Not to mention drilling 12.9 class bolts takes some patience. That's some hard metal you're drilling. Better have a high quality drill bit too........