Broken Crankshaft Count?

[juddski88]

Well I was a little reluctant especially with the big heavy lmm throws and all the extra webbing if everything would clear.
Has someone done this successfully yet?

big heavy what? just an FYI, my LML crank APPEARED to not fit, and APPEARED to be heavier...but in reality it was lighter in mass and needed to be lightened up at both ends in order to balance out correctly. I can't remember the mass offhand, but I can review the notes as soon as i can.

 

[JoshH]

Ok should I start a new thread?

No, it's fine. I was just clarifying that you aren't getting it back "on topic". Just changing the topic to a different maybe slightly less off topic. :thumb:

 

[jkholder09]

big heavy what? just an FYI, my LML crank APPEARED to not fit, and APPEARED to be heavier...but in reality it was lighter in mass and needed to be lightened up at both ends in order to balance out correctly. I can't remember the mass offhand, but I can review the notes as soon as i can.[/QUOTE

I agree with the appeared not too fit part. I looked at it, it didn't look promising so I gave up.

You have done allot more work here so any info you could post up would be awesome.


When you installed the lml crank it was still externaly balanced, did you try to use the lml dampner to balance it?

I would think you would be running aftermarket dampner?

 

[jkholder09]

No, it's fine. I was just clarifying that you aren't getting it back "on topic". Just changing the topic to a different maybe slightly less off topic. :thumb:

ok cool man, I am just searching the forums for a solution to a common and kinda disheartning duramax weakness.
It is scary for owners to pump a large chunk of money in an engine build with the dark cliff of crank failure looming in the background.

All that considered when you are in 4 digit power thats the nature of the beast, but it happens stock also.
I know someone is gonna figure it out thats why we are here:hug:

 

[duratothemax]

The lml pins are tapered at the ends

explain.......

 

[duratothemax]

Do you guys have to take everything literally.?

are you for real? This is a technical forum. Specifics matter when we are talking about this crap. What would be the point of posting something thats wrong or "only half correct".

 

[jkholder09]

explain.......

the pins on the lb7/lly are basically a straight cylinder, on the lml the are a straight cylinder but a cone has been removed from each end, its about 3/4" deep and it removes a decent amount of weight.
I have all the weights written down, because I have done a few lml rod/piston builds and I was attempting to find a combo that didn't need a rebalance.
I did not find that combo, and maybe I shoulda examined the lml crank more thoroughly.

But as the member that has got an lml crank in an older model said, it looked like it wasn't gonna happen, physically.

 

[juddski88]

big heavy what? just an FYI, my LML crank APPEARED to not fit, and APPEARED to be heavier...but in reality it was lighter in mass and needed to be lightened up at both ends in order to balance out correctly. I can't remember the mass offhand, but I can review the notes as soon as i can.[/QUOTE

I agree with the appeared not too fit part. I looked at it, it didn't look promising so I gave up.

You have done allot more work here so any info you could post up would be awesome.


When you installed the lml crank it was still externaly balanced, did you try to use the lml dampner to balance it?

I would think you would be running aftermarket dampner?

nope, I ordered the internally balanced LML crank...

 

[duratothemax]

I agree with the appeared not too fit part. I looked at it, it didn't look promising so I gave up.

but you said it "didnt fit" it a previous post? You didnt say "I took a quick look at it and from 20 feet away it doesnt look like it will fit".

Like I said. This is a tech forum where details matter. If you arent sure about something or are making a generalization that you dont know as 100% fact, then SAY SO.

 

[jkholder09]

are you for real? This is a technical forum. Specifics matter when we are talking about this crap. What would be the point of posting something thats wrong or "only half correct".

I meant do you have to pick it to pieces?
Can't you comment back on the whole post/quote the whole post?
That way other readers can see my complete thought, not just the small piece that you want to beat on???

It would be nice to have a little bit more relaxed enviroment sometimes as we are all off work and unwinding a bit.

 

[jkholder09]

but you said it "didnt fit" it a previous post? You didnt say "I took a quick look at it and from 20 feet away it doesnt look like it will fit".

Like I said. This is a tech forum where details matter. If you arent sure about something or are making a generalization that you dont know as 100% fact, then SAY SO.

Ok definately need to clarify everything i agree and I will certainly try ok?:hug:

But I was really looking at the lml block because of the webbing, I am not sure if the crank is stronger yet or not.
Lighter is good, Lighter could have better harmonics......or worse.

Has anyone put an older year crank in an lml block, I feel the block is stronger due to webbing and will allow less crank flex.

This is my best try to avoid broken cranks.

How is that for clear and concise sir

 

[JoshH]

but you said it "didnt fit" it a previous post? You didnt say "I took a quick look at it and from 20 feet away it doesnt look like it will fit".

Like I said. This is a tech forum where details matter. If you arent sure about something or are making a generalization that you dont know as 100% fact, then SAY SO.

Not that I'm taking sides or claiming he is correct, but he said an LML block requires an LML crank. He didn't say an LML crank requires an LML block, which, unless I'm misunderstanding something, is what Tim did.

 

[duratothemax]

the pins on the lb7/lly are basically a straight cylinder, on the lml the are a straight cylinder but a cone has been removed from each end, its about 3/4" deep and it removes a decent amount of weight.

yeah the LBZ/LMM wrist pins are like that too.

and FWIW, they (LBZ/LMM) are NOT lighter than the "square end" LB7/LLY wrist pins. Ive never weighed an LML wrist pin, but I would have to see proof that it is "a decent amount lighter".

 

[JoshH]

yeah the LBZ/LMM wrist pins are like that too.

and FWIW, they (LBZ/LMM) are NOT lighter than the "square end" LB7/LLY wrist pins. Ive never weighed an LML wrist pin, but I would have to see proof that it is "a decent amount lighter".

I was looking at some pictures Tony Burkhardt posted on DP, and the taper is definitely greater than an LBZ/LMM wrist pin. I believe the pin is also shorter.

LBZ on the left, LML on the right.

 

[jkholder09]

yeah the LBZ/LMM wrist pins are like that too.

and FWIW, they (LBZ/LMM) are NOT lighter than the "square end" LB7/LLY wrist pins. Ive never weighed an LML wrist pin, but I would have to see proof that it is "a decent amount lighter".

yeah the lbz wrist pins are the heaviest by far

 

[jkholder09]

I was looking at some pictures Tony Burkhardt posted on DP, and the taper is definitely greater than an LBZ/LMM wrist pin. I believe the pin is also shorter.

LBZ on the left, LML on the right.

yes yes thanks man
I was just putting my shoes on to drive to the shop haha:thumb:

 

[blk smoke lb7]

Wow very nice find josh

 

[juddski88]

Not that I'm taking sides or claiming he is correct, but he said an LML block requires an LML crank. He didn't say an LML crank requires an LML block, which, unless I'm misunderstanding something, is what Tim did.

If only I had an LML block here....hell, I'll send this guy my broken crank to drop into his LML block just to be nice

 

[jkholder09]

you could send it to ben to stick up his.......just kidding ben:hug:

 

[juddski88]

he's got one already....