SCOTT OVERMANN

HEY GUYS,I HAVE HEARD THAT THE EAGLE CRANKS ARE JUNK.IS THIS TRUE AND WHAT ABOUT SCAT CRANKS.I HAVE HEARD THAT THESE CRANKS ARE EXTREMELY GOOD.ANY COMMENTS....THANKS

Fast3rdGen

eagle steel crank in my ride. no complaints so far and i've spun it up to 7500rpm many times.

chacane67

Scat makes a good cast crank.... a-lot of the local "Left handers" use them and continually buzz them at 7500RPM. Just do not use a 'Fluid Dampner' on their cast cranks.

e-man

I just had a scat 9000 crank,scat 5.7 stroker rods and speed pro hyper pistions balanced for my motor and my engine builder said he was suprised it balanced so easy.Only had to add one piece of mallory to the crank to balance it. He builds higher end engines and reccomends Callies $$$$ forged cranks for his engines but said the parts that I picked out for my build werent bad for the money.He also said wont even touch a Eagle crank.

laiky

i've been running an eagle cast steel crank, now considering its not intended to replace a forged steel crank it is a good deal.

just for the record i've been told that the Eagle and Scat cast steel cranks are from the same place, they are cheap because they are cast in China, with the final machine work done here. If you look around you will find that most of the less expensive castings in quite a few products are comming out of china. It is a good alternative to a cast crank but in no way a replacement for a forged steel, just keep that in mind.

GofasterFirebird

iTrader: (3)

Look in Summit. They have CAT forged cranks for like 400 bucks. They claim they are rated to 800 hp. I bought one for my 406.

And not using a fluid dampr on a crank? Wow, that is a new one.

Fast3rdGen

you CAN use a fluidampr on scat and eagle cranks but you have to hone the hub out for some reason. not the first time i have heard that one.

GofasterFirebird

iTrader: (3)

ATI as well as Vibratech both recommend a hone on the damper for any crank for proper fit.

chacane67

In the racing community, it has been advised by SCAT not to run a FluidDamper on their 'cast' crankshafts. The reason for this is that they have had failures from the specific harmonic of the materials in the crank and the dampner itself, (and something to do with its weight was also remarked on), tends to brake off the crank snout. This is a seperate problem from the 'honing' issue.

This isnt new news....

Jim85IROC

iTrader: (2)

I wonder why this issue is isolated to scat cranks. It seems that all cast cranks would have similar issues unless the scat had some inherant weakness that the others don't.

Slade1

Scat cranks and fluid dampeners = bad

Here's why...

https://www.thirdgen.org/techbb2/sho...hreadid=140512

Look at "Aren't cranks supposed to be straight?"

http://members.rogers.com/yacko/Pics/DCP02462.JPG

RIP 383 Stroker

chacane67

The material density used by the actual manufacturer (in China) has a certain resonant frequency. Appearently, one that doesnt work too well with the internal inertial weight of a FluidDamper. One would think it would be the same with all cast cranks, but there is just something about this one in peticular.

I have used SCAT cast cranks before, and have had no problem, after being told not to use a FluidDamper. I myself use ATI dampers exclusively. There product works better at higher RPM (in comparison to others) where most of my time is spent.

Slade1

Yeah that was Scat's explanation for it too... the resonance frequency is dead on with the fluid dampener and their 383 stroker crank.. so much so that it only takes a few seconds at that resonant frequency to destroy it. Scary thought huh?

The worst part is he was told by scat not to use it but forgot after his other balancer busted. He only remembered after he busted it.

Shagwell

What about running a Fluidampr on a stock crank? - I always thought Fluidamprs' were great, but you guys are sacring me...

JAY87GTA

Well I just got done building a 383 with a SCAT cast crank, and I have nothing good to say about them. It took alot of work to balance it properly. I could understand if it was an even amount of weight from both ends of the crank, but my machinist had to take 180 grams form one end, and only 60 from the other end. This isn't only isolated to the Chevy cranks either. A friend built a 331 Ford stroker with a SCAT crank, and had the same problem. If the customer service would have been good I'd have no problems, but the A-hole at SCAT had a real crappy attitude with me, then when my machinist called him they left him on hold for 30 minutes the first time, he had to leave a message the second time, and it took them 3 days to return his calls. That is IMO,

Cruz'N Bruz'R

LT1guy

iTrader: (1)

CAT cranks use the same blanks as Eagle...I was told when I worked for a major parts supplier here in GA that CAT buys cranks from Eagle that don't meet their standards. I didn't beleive it at first, but after seeing several CAT cranks shipped to us (by CAT) in taterred Eagle boxes, I wonder...

The Eagle cranks do look much nicer than the CAT ones, and tend to be easier to balance from what our customers said. I won't hesitate to run an Eagle crank, but it will be forged, not cast.