440 crank

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EchoSixMike said:
You can take off a lot of mass by rounding and smoothing the CW's and cleaning up flash and sharp edges from the original forging. BUT, it won't be nearly as effective at removing bobweight as lathe turning, because you're working at a closer radius to the crank centerline. It's just like torque, force times distance. An equal force/mass at twice the distance from center is twice as effective.

What I did with my factory crank projects is to go apeshit with the grinder first, then send it off to get the journals ground(if needed), nitrided and then do final balance, lathe turning etc etc. S/F....Ken M
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I`M HAVING TROUBLE WITH THE "GRINDER" PART, WHY NOT DO THAT IN A LATHE TO START WITH ?!!?
MUCH MORE ACURATE AND A CLEANER JOB ! disregard caps !
 
If you can contour the front and rear of the counterweights and remove flashing and sharp edges on your lathe, I would like to see a video:) S/F....Ken M
 
You also can finish drilling the rod pins, then you can take even more counterweight material off.
 
This is what it looks like now. The pins do need alittle contouring. Kim

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EchoSixMike said:
If you can contour the front and rear of the counterweights and remove flashing and sharp edges on your lathe, I would like to see a video:) S/F....Ken M
Click to expand...
I have never had a forged crank w/ any kind of "flash'' on it !!
 
famous bob said:
I have never had a forged crank w/ any kind of "flash'' on it !!
Click to expand...

Well I`ll take that back, the street hemi`s had a very small amount of roughness in the undercut fillets, from the fqactory , but was lower than the bearing surface.
 
IQ52 said:
I'd think about cutting the counter weights down. When I built the 451 stroker with a factory 440 steel crank, I cut the counter weights .120" in radius for use with 6.76" H-beam rods and Ross forged flat top pistons. Took very little drilling on the crank after that to balance it.

My pistons were 510 gms and the pins were 158 gms. Scat H-beam rods for 2.375 journal.

Ask those that are going to do the balancing for you.
Click to expand...
Exactly what I did with my 451. It balanced fine with no need for Mallory. Machine shop said if you had heavier pistons I might have needed Mallory.
 
famous bob said:
I have never had a forged crank w/ any kind of "flash'' on it !!
Click to expand...

As the picture shows, what I mean is the metal smeared around by dull tooling and excessive feed rates. On aftermarket cranks, this isn't an issue. S/F...Ken M
 
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