SteveDoten@ARH

Crank 12552216, was the same crank used in the following??

5.3, 1999up? (I've seen it in 2005's)
5.7 1997up (verified in 2002/2003 LS6)
6.0 01up (LQ4 has a different flange??)

It's widely known the stroke is the same on 5.3/5.7/6.0, wasn't sure if the 12552216 crank had different weights for the different pistons?

It's noted that the LS1/6 cranks are gun drilled, is this unique to those motors, or standard throughout the 100,000plus built every year(cars/trucks)

Thanks

SteveDoten@ARH

I'm guessing there are few 100 of you with motors torn apart?

12552216 on the crank? gun drilled the norm for all applications of this pn?

Thanks

Rspatterson

12552215 on long crank LQ4.

chrisfrost

iTrader: (8)

BTW the 6.2L also uses the 3.622" stroke ,,,,,,,,not sure if it uses the same exact crank or not tho .

bww3588

iTrader: (49)

Castings are the same, hence the same number. But they are balanced differently and the ls1/6 and the Ls2/3/9...etc had the mains gundrilled as you mentioned. Otherwise, same crank.

SteveDoten@ARH

where is the balance different? you measured the counterweights?

what about the 500,000..plus truck motors using the 12552216 crank? 5.3/6.0's

I don't own or have worked on LS9's, but GM has the 2216 crank with "8 holes" for the Flywheel using the same part number????

bww3588

iTrader: (49)

The ls9 is probably a different crank. That was a typo. Otherwise, they are all the same crank. Don't need to measure bob weights to know that. If a 5.3 crank was balanced the same as a 6.0 crank, it would hammer itself to death.

89 formula350

iTrader: (8)

yes the counter weight balance was different.

I used a 6.0 crank in a ls1. the weight was close and likely would have been fine but I had it balanced to match my rods/pistons/rings and bearings. was not riffled though

SteveDoten@ARH

1. LS9 is prolly a different crank? or was that a typo?
2. If you don't measure the counter weights, what's the point of knowing which 12552216 crank you have?
3. 5.3 vs 6.0 crank is NOT balanced the same? what numbers did you come up with on the machine?
4. Correct me if I'm wrong, the "bob weights" I originally had posted is a fck up on my part, "counter weight" would be the correct term
5. With "bob weights" being used to account for the rod/piston/pin assembly during balancing



CW balance different? 6.0 vs 5.7? what were your numbers?

bww3588

iTrader: (49)

The point in knowing is it's easy to tell if it's a 6.0 truck crank or ls1 depending on if the mains are drilled or not. Not sure what specific questions you are wanting answered here but most people don't have a crank balancing machine in their garages so your probably not going to get exact counter weights.

Case and point is, the cranks are the same if it has the same casting number. Only differences are balance and mains being drilled or not.

If you have a 216 crank laying around and not sure exactly what it came out of and want to use it, you should have it balanced. And...if your using anything but stock components, it makes on difference what your putting it in, it WILL need balanced.

SSCamaro99_3

iTrader: (1)

LS9 is forged.

SteveDoten@ARH

Can anyone verify the truck cranks that have the 2216 casting on them are NOT gun drilled.

Has anyone actually spun a 16 from varying motors(5.3/5.7/6.0) and verified the balances are different

Looking for "firsthand experience"

bww3588

iTrader: (49)

This is getting stupid. I have 5 cranks laying in my garage. 4 are ls1 cranks and are gun drilled, one is out of a 6.0 truct engine and it is not drilled.

You will probably not get first hand experience as to the balances because it is common sense to anyone that knows anything about engines that the balances will be different using pistons that vary from 3.780-4.065, to dished, to flat tops to flat with valve reliefs.

The balance is different...period.

The truck cranks are not drilled...period.

bww3588

iTrader: (49)

If your that hard headed, I'll go to the garage tomorrow afternoon and take pictures. Even the counter weights are drilled differently proving the balance is different.

Even the fact the mains on the truck crank are not drilled will change the balance. If all the cranks were balanced the same, you would have engines that beat the **** out of themselves in a matter of hundreds of miles.

SteveDoten@ARH

of the 6 CW's on a 2216 crank, you will most likely find 3 holes drilled in various sizes on the first and last CW; put two LS6 cranks side by side and they will both be different(

1. Does GM "zero balance" the cranks for the LS motors?
2. Does GM balance the crank to EACH INDIVIDUAL rotating assembly?
3. Does GM do both of the above AND account for the different "COMPLETE" mass of the different size pistons.

Why on god's green earth would the gun drilling affect the balance if it's center mass?

My background is in F16's/A10's Fighter Aircraft since the age of 18(US Air Force), I've swapped out dozens of drivetrains/motors/trans/diff's in C5/6's

I know VERY LITTLE about GM assembly practice and the "machine shop" process on balancing LS motors...................gotta go to SAM and get serious

Thanks

Way2Fast

iTrader: (1)

The LS engine is no different than any other engine as far as balancing goes. I can see your confusion as to the same part number being applied through the different engine displacements, but that doesn't mean they balanced them all the same. I am sure they don't balance individual assemblies. They probably took weights from a run of parts came to a range then "half-assed" balnced the cranks. I know when I rebuilt my 98, I re-used all components except the rings and bearings and re-balanced the assembly. It wasn't that far off, but it was by no means perfect.

SteveDoten@ARH

bww, fwiw, I live here in New England amongst 14,000,000 people, the only person I talk to regarding LS knowledge is Don Kinder

...........in other words, I've found very few people actually have the correct answer and nothing beats firsthand experience

bww3588

iTrader: (49)

You have many correct answers in this thread.

I've balanced many ls cranks, just never stock for stock as I don't build stock engines. I've used 6.0 cranks is ls1's and visa versa, but never with stock pistons and or rods, so I cannot give you first hand on the exact weight difference down to the last gram. I'm still trying to decide why this is so critical to you simply because this is useless information.

SteveDoten@ARH

The drilling/balancing IS different on 2 2216 cranks I currently have that BOTH came out of LS6 motors...........

My questions are still the same as the 1.2.3. 2 post up

So far, everyone is "guessing" as to the balance of the cranks and commenting on "non OEM" rods/pistons and the balance performed.

Way2Fast

iTrader: (1)

Not true. I used factory rods and pistons. I don't have an ls6 so yep guessing. So FACT is on a 98 LS1 the factory balance was not perfect.

I will guess again that every rotating assembly is not weighed at the factory.

Was it advertised for the Z06 with the LS6 to have a hand assembled engine? I can't remember, but I am sure the camaro didn't have one.