Hey pplz, i have a fully worked A14 which i use to run a std crank in, now i have gone to a A15 Crank, i have 11mm flycuts in piston tops, since running the A15 crank i keep snapping the bolts, any info in the way of wot type bolts i can use, or should i get some made up, currently rebuilding, also will compression be to high as its only bored 80tho not 120, cant afford avgas nemore

arp studs? will work well?

something not right ive built many race engines using new genuine STD bolts turning 8500rpm 14;1 comp. not broken rods bolts yet

yer not sure wots happening, Bige, do u have ne spare race parts, after a knifeedged A15 crank, or how much to do one???

best to give me a call 0412 864 741 ernie

sweet as, busi atm, but i will be in touch mate, might need other things to, thanx champ

Perhaps the installer overtightened them. Use a torque wrench, and dont go too tight.

are there tourqe settings on the site or if not wots recommened?? and is there a patteren to tightening crank bolts like wheel nuts??

What 'crank bolts' are you talking about? Rod bolts, Main bearing bolts or flywheel bolts?
"Crank Bolts" is not really very clear.

I'm guessing that it's in a racer as a "fully worked" engine would quite naturally be totally undriveable on the street & if that's the case, you are probably breaking the flywheel bolts when the revs start climbing over 8,500 or 9,000rpm.
It's a common problem.

sorry, flywheel bolts,