Fidanza flywheel bolts

[johnymd]

for my stroker engine build I have used a fidanza Ali flywheel. I supplied the engine builder with arp flywheel bolts but he returned them saying they were too short and he wasn’t comfortable using them. He suggested I find a longer bolt. After a bit of digging I find that skyline bolts are around 6mm longer which is roughly the difference in flywheel thickness so ordered a set. It then occurred to me that I am bolting softer aluminium so should I also use a hardened washer to spread the load a little.

I can’t be the first to consider this so what’s the accepted solution. I’d quit like my flywheel to stay attached to the crank when I’m thrashing it round a track so what to find a solution I’m happy with.

 

[jonbills]

I wouldn't think you need hardened washers. It's not like it takes a pounding like the valve seats.

 

[atomman]

I would just use the longer bolts with some proper loc-tight John , they have a flange on the head that will grab the ali, if you use a hardened washer under that i think it will compromise the grip as the bolt head wont 'bite' ,

 

[johnymd]

Thanks for the replies. Gives me confidence to continue.