I am building a 392 hemi and should put out some good Horsepower. We are looking to safty wire all nut and bolt connections. Not just for safty but looks of a old 50's traditional build of a old sprint car builder.The problem we are having is finding predrill bolts and nut that are of proper grade. For instance the flywheel bolts we need 1/2-20 and lower grades as well. thanks
Whats the grade for aircraft for grade 8? I made a fixture for the Bridgeport (mill) but eating up drill bits with the hardened bolts. Plus I have a bucket full of bolts I have to do. Yea I know I'm looking for the easy button thanks
Going to be tough drilling those hardened bolts even with carbide.Find a shop that does wire edm and have them hole pop the holes.Goes really fast and shouldn't cost that much.If you were closer we could do them.
ABSOLUTLY no need to safety wire flywheel bolts-- Clean threads, spot of locktite, torque ARP bolts to spec. If safety wire was nessasary the bolts would already have been drilled besides whos going to be able to see them anyway?
i know arp has a "nascar" option for some of its bolts. they pre-drill safety wire holes for you, maybe they do it on flywheel bolts? give them a call.
Blue Loctite. Safety wire does not belong on a balanced rotating assembly. Unless you have the ability to install it to perfectly balanced standards. For looks and safety is fine. Loctite will take care of the safety. If anyone sees your flywheel bolts, after assembly, something has gone very wrong.
First off the bolts are not hardened ! Heat treated yes ! Use cobalt bits with the proper speed ,don't think the BP has enough speed to properly run 1/16-1/8 bits . A bit of cutting oil or flood coolant helps. PS I own 2 BPs so I know a bit about them.
Bizarre. I keep thinking of the robocop in THX1138 bumping into the wall, backing up, and bumping into it again, and again. Zzzzzz. Wire tie a rotating assembly that depends on balance and knowing the knot is going to be a tad heavier. ARP makes a 12 point bolt that if installed with a dab of red Locktite won't re-surface into consciousness until the next teardown. Never seen a flywheel in the stands at Taladega; and I doubt anything but ground effects cars are going to turn speeds like The King did. Have mission control reboot this one, from Houston, over.
I should have been more specific. Not to argue with anyone but just a very small dab will do ya. Posted using the Full Custom H.A.M.B. App!
Maybe you want what is called a "place bolt," available from ARP and other quality suppliers. Used by Ford and many others for years on ring gears, flywheels, etc, but they date back to the steam era. The head is specially contoured to act under tension like a diaphragm so the fastener can't back out. Once you use them, place bolts are sort of addicting. Very satisfying feel when you torque them down.
like 80 % that ive worked on, and boy is it a bitch to get a nice looking safety wire job back there!
Qualified aviation mechanic, versus backyard mechanic. What is the maximum operating RPM of a piston-driven prop?
since i've done a few i guess that makes me qualified? my point is it's ok i my opinion to safety wire rotating assemblies. BUT...i also see no reason to safety wire flywheel bolts
My engine builder goes all the way to balacing the entire rotating assembly to within one Gram. For the uninitiated, that is 0.0352 Ounces. Now tell me you can feed out, twist and install safety wire, with hand-tools and your eyecrometer, to that level of accuracy. No matter how you slice it, you are creating imbalance. On a low RPM engine, with a mandated overhaul interval, that is one thing, everywhere else, it is another.
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