New LML Crank for Build?

[coker6365]

Just curious if anyone else is running a new LML Crank in their build?

Josh wanted to start fresh, so we decided to give the LML crank a shot. We think it will be just as good or better than the LB7, but it's all a crap shoot at the end of the day. Lol

 

[mike diesel]

I thought people couldn't get lml cranks anymore? Atleast I heard people were having a heck of a time buying one.

 

[coker6365]

This one is coming from Guy at SoCal. I don't know if it was in stock or not, Josh will have to chime in.

 

[hntngkd]

I bought one around the beginning of June. I had to call the GM parts warehouse everyday until one came in. You can still get them but they aren't easy to find.

 

[hipp11B]

Kinda the way I wanna go with my build as well, good luck bro

06 lbz built trans, airdog2, Ppe gauges, efi by eisenhart diesel, arp head studs, Danville billet 68mm 4094, custom traction bars, fuel rail shim, s&b intake, 5 inch mbrp 7 inch stack, 20x12 tis, Goodyear duratrac my.

died - Feb 2015

 

[S Phinney]

I have one internally balanced in my new build. They are a little better metal as far as density and hardness. Almost identical to a lb7 crank and 300 bucks cheaper.

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[maine04max]

Shane you wanna share what that lml crank ended up costing you ?

 

[hondarider552]

Just bought one couple days ago. Around 700$.

 

[Ne-max]

So does a guy use a lbz or lb7 flexplate and dampner if not internal balancing with the lml crank?

 

[hondarider552]

GM parts direct price 642.87 + shipping.

 

[maine04max]

thats not as bad i thought . I'm making plans for my 2nd motor build

 

[hondarider552]

FYI...

CRANKSHAFT
Part #12641925



Subtotal $642.87

Promo discount -$32.14

Handling $63.21






Total $673.94

 

[coker6365]

So does a guy use a lbz or lb7 flexplate and dampner if not internal balancing with the lml crank?

I'm not sure, Josh just said he would balance it with the flex plate, damper, and send it all at one time. I will have to ask.

 

[coker6365]

I have one internally balanced in my new build. They are a little better metal as far as density and hardness. Almost identical to a lb7 crank and 300 bucks cheaper.

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Looks fancy! I am jelous...:thumb:

 

[dirty_max]

so when all this balancing is done, is done by rotating it or measuring it? im curious to know how this works. my buddy just had his done and the machine shop said that they had to assemble the entire bottom end to balance it. youll have to pardon my ignorance, ive never rebuilt an apparent bore engine before, just the big wet sleeve engines so its pretty rare that anything goes to a machine shop other than a crank every now and again.

 

[Dmax87]

so when all this balancing is done, is done by rotating it or measuring it? im curious to know how this works. my buddy just had his done and the machine shop said that they had to assemble the entire bottom end to balance it. youll have to pardon my ignorance, ive never rebuilt an apparent bore engine before, just the big wet sleeve engines so its pretty rare that anything goes to a machine shop other than a crank every now and again.

In my experience, the machine shop needs the crank, rods being used, pistons, 1 set of rings and I can't remember if they wanted bearings or not. This is used for just a "balance" job. What Shane has is big $$$, internally balanced crank.

 

[S Phinney]

You can externally balanced it using lb7 components. Or you could use the lml components if you desired. A internally balanced crank cost you about 3150 bucks total cost. It gains 7 lbs from the heavy metal. Originally it weighed about 77 lbs and after it weighed about 84 lbs. If money wasn't an object I would have went with a Winberg internally balanced crank but those go for 6150 bucks.

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[S Phinney]

In my experience, the machine shop needs the crank, rods being used, pistons, 1 set of rings and I can't remember if they wanted bearings or not. This is used for just a "balance" job. What Shane has is big $$$, internally balanced crank.

To balance a crankshaft you need pistons, rods, rings,and remodeling bearings. The Bob weight is computed from weighing each component and the rods are weighed big end vs little end. You then come up with reciprocating weight and rotating weight. Your machine shop will throw a oil factor in as well. They make up the Bob and spin it up. If it is externally balanced the assembly is spun as a whole including balancer and flywheel with the Bob weights attached to represent the actual assembly. If it is internal the crank is spun by itself, then with a neutral balancer , then with the neutral flywheel and finally with both balancer and flywheel. If you were to see a balance sheet for a internally crank you can see every quickly how the balancer and flywheel dampens harmonics.

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[coker6365]

Very interesting Shane. Mine will be externally balanced. What is the main difference between the two from a functionality standpoint? Is it more about keeping the weight on the nose down or is it more accurately matched?

 

[S Phinney]

Very interesting Shane. Mine will be externally balanced. What is the main difference between the two from a functionality standpoint? Is it more about keeping the weight on the nose down or is it more accurately matched?

The more you can move inside helps with harmonics. Bringing the weight inside definitely will help with stresses from torsional rotation. That doesn't mean it won't fail but I suppose every little bit helps.

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