double keyed crank
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Teching In
Joined: Feb 2007
Posts: 47
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From: tallapoosa,Ga
double keyed crank to run a 6-71 blower is it really required to have a double keyed crank?
engine is a 383sbc
eagle 4340 crank
balancer is pro products sfi balancer
weiand says they highly recomend having a double key crank. i have ran the engine on a dyno with a 6-71 @ 14* and it didnt break. i just cant see myself taking the crank back out to get it cut for a 2nd key.
has anyone had experience with this?
engine is a 383sbc
eagle 4340 crank
balancer is pro products sfi balancer
weiand says they highly recomend having a double key crank. i have ran the engine on a dyno with a 6-71 @ 14* and it didnt break. i just cant see myself taking the crank back out to get it cut for a 2nd key.
has anyone had experience with this?
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Teching In
Joined: Jul 2011
Posts: 12
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From: michigan
Plz do double key ur crank. On the 4th of july i got to experience what happens when the crank hub spins off. An ounce of prevention is worth a pound of repair. Im just now getting my crank pulled. Bran new eagle crank which is now garbage. I havent ordered a new one yet, but im getting ready to call eagle and buy a double keyed crank. I bought an ati bbc double slotted crank hub, new ati super damper, $298 timing cover to accomodate the bigger hub, and a new spacer to line up my pulleys correctly. My hub was actually spinning to a point, for quite some time. I caught it when the pulleys started to go out of line and the power steering started slipping in and out. But It was too late the stock hub took way too much material off my crank snout. U live and learn i guess, but this lesson cost me some loot. So save urself some money and get it double keyed.
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x2 I was running an F2 with 50mm cog belt. I had a lunati proseries crank with single key and it sheared off on the dyno under partial throttle tuning. I didn't even get to make a WOT pull.
What you need is a SBC crank w/BBC snout and dual keyways. Anything less and you'll be pulling the motor frequently for new cranks. The amount of sideload blowers place on the cranksnout and bearings is tremendous.
What you need is a SBC crank w/BBC snout and dual keyways. Anything less and you'll be pulling the motor frequently for new cranks. The amount of sideload blowers place on the cranksnout and bearings is tremendous.
