3400 and 3100 forged or billet crank

[Guest]

the 3500 is forged, has a 58 or so tooth crank sensor wheel, and wider bearings along with a larger diameter. THis is probably how JBP offset grinds for different strokes. Other than that, I don't really know as I haven't had one to look at. I know JBP isn't getting them made for that price so the only logical solution is the 3500 crank with some work done to it.

You might want to re-check your thinking..... Mev had the first billet crank long berfore we knew of the 3500, or 3900.

It is a new part, not a re-worked part.

[TurboZ24]

He says it's a forged crank, not a billet. I would agree with Ben, though. Knowing how JBP sets up their pricing structure (usually around 100% markup), I highly doubt anyone would forge a short run of cranks and only charge 450-500 bucks for them. that's basically what GM charges for a new stock crank.

[SappySE107]

Are you sure they had a REAL forged crank before the 3500 crank? Sure, they claimed to have one years ago but it wasn't forged at all...it was a reworked stock crank. It wasn't until the 3500 cranks were available that mev came out with a true forged crank.

Logic tells me there is no way in hell its a new crank. Considering that he hasn't been able to send one out since october, where is the large bulk supply required to get a price even remotely close to what he sells them for, let alone markup (which he does a lot of, look at his other products).

Ive talked to someone with the JBP forged crank and it has the same wide bearings as the 3500 crank, what appears to be grinding where a casting number would be, and the place he had check it out said that the crank looked like it was from a major supplier, not a custom made or short run crank. Ill take all these things into consideration and stick to my comments.

[v6h.o.]

GM 3500 Crank # 12577484

Canadian Retail $ 1029.33, Canadian$ "trade" cost 748.00
My GM Employee Pricing in CAN$ funds 605.25$

From GMPD to give an estimate on USD$ range:
GM PART # 12577484
CATEGORY: Engine Crankshaft
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $542.29
OUR PRICE: $309.11


I'd have to agree with Ben on the JBP crank theory.

[Guest]

Since it has "larger bearings" does that mean it can't be used in the older blocks?

I am confused as to what that means. Are the main journals the same size?

I dont' care about the tooth count on the crank as it wouldnt' have a crank sensor.

[SappySE107]

I think the mains are larger diameter and the rods are wider. I don't know for sure, as I haven't measured one. For 309.11, I think someone should be looking into this Im broke so I can't help.

[v6h.o.]

3500:

Connecting Rod

* Connecting Rod Bearing Clearance
0.18-0.062 mm
0.0007-0.017 in

* Connecting Rod Bore Diameter
60.322-60.338 mm
2.375-2.376 in

* Connecting Rod Bore Out-of-Round
0.006 mm
0.00023 in

* Connecting Rod Length - Center to Center
150 mm
5.9 in

* Connecting Rod Side Clearance
0.200-0.241 mm
0.008-0.009 in

* Connecting Rod Journal Diameter
57.122-57.138 mm
2.249-2.250 in




3400/3100:

Connecting Rod

* Connecting Rod Bearing Clearance
0.18-0.062 mm
0.0007-0.017 in

* Connecting Rod Bore Diameter
53.962-53.978 mm
2.124-2.125 in

* Connecting Rod Bore Out-of-Round
0.008 mm
0.00031 in

* Connecting Rod Length - Center to Center
144.75-144.81 mm
5.69-5.70 in

* Connecting Rod Side Clearance
0.25-0.37 mm
0.010-0.015 in

* Connecting Rod Journal Diameter
50.768-50.784 mm
1.9987-1.9994 in

[v6h.o.]

I think the mains are larger diameter and the rods are wider. I don't know for sure, as I haven't measured one. For 309.11, I think someone should be looking into this Im broke so I can't help.

Someone already has a complete 3500 sitting in his garage. However he's still to buisy to fuck around with it in terms of measurements and such.

When he gets time he'll take pics..

[SappySE107]

So I need to go to a garage and pickup (steal) a complete 3500. You can PM me the location and ill get my ski mask on

[Guest]

so it looks like the rod journals are larger as well as having longer rods.

No specs on the mains though. Most likely larger as well though.

Makes me think that since it has a longer rod, it has a taller deck height.

Can't use the rods with stock pistons. Would need a custom piston with a shorter pin height of .2 to compensate if wanting to use the 3500 crank and rods if thats even possible which it probably isn't.

Oh well.

[SappySE107]

I wouldn't give up that easily.

The other specs are all on this site.

[v6h.o.]

Sorry Shawn, Here are the Crank specs:

3500 Crankshaft

* Connecting Rod Journal Diameter
57.122-57.138 mm
2.248-2.249 in

* Connecting Rod Journal Out-of-Round
0.005 mm
0.0002 in

* Connecting Rod Journal Taper
0.008 mm
0.0003 in

* Connecting Rod Journal Width
21.92-22.08 mm
0.863-0.869 in

* Crankshaft End Play
0.060-0.210 mm
0.0024-0.0083 in

* Crankshaft Main Bearing Journal Width
23.9-24.1 mm
0.941-0.949 in

* Crankshaft Main Bearing Clearance
0.019-0.064 mm
0.0008-0.0025 in

* Crankshaft Main Journal Diameter
67.239-67.257 mm
2.6473-2.6483 in

* Crankshaft Main Journal Out-of-Round
0.005 mm
0.0002 in

* Crankshaft Main Journal Taper
0.008 mm
0.0003 in

* Crankshaft Rear Flange Runout
0.04 mm
0.0016 in


3100/3400Crankshaft

* Connecting Rod Journal Diameter
50.768-50.784 mm
1.9987-1.9994 in

* Connecting Rod Journal Out-of-Round
0.005 mm
0.0002 in

* Connecting Rod Journal Taper
0.005 mm
0.0002 in

* Connecting Rod Journal Width
21.92-22.08 mm
8.62-8.69 in

* Crankshaft End Play
0.060-0.210 mm
0.0024-0.0083 in

* Crankshaft Main Bearing Journal Width - #1
29.5 mm
1.161 in

* Crankshaft Main Bearing Journal Width - #2
24.0 mm
0.945 in

* Crankshaft Main Bearing Jounal Width - #3
24.04 mm
0.946 in

* Crankshaft Main Bearing Journal Width - #4
35.8 mm
1.409 in

* Crankshaft Main Bearing Clearance - Except #3
0.019-0.064 mm
0.0008-0.0025 in

* Crankshaft Main Bearing Clearance - #3 Thrust Bearing
0.032-0.077 mm
0.0012-0.0030 in

* Crankshaft Main Journal Diameter
67.239-67.257 mm
2.6473-2.6483 in

* Crankshaft Main Journal Out-of-Round
0.005 mm
0.0002 in

* Crankshaft Main Journal Taper
0.005 mm
0.0002 in

* Crankshaft Rear Flange Runout
0.04 mm
0.0016 in

* Crankshaft Reluctor Ring Runout - Max
0.34 mm
0.0134 in

* Crankshaft Runout
0.025 mm
0.0010 in



Oh Ben if you want to drive all the way up to Winnipeg be my guest.
The engine I have has damage. Nothing that matters to me anyways as the pistons/valves will be replaced anyways.

[SappySE107]

Hehe, im sure the border patrol will question my motives for the ski mask and pry bar:P hahaha, if I was closer id definetly want to check it out though.

[v6h.o.]

Well I'll take pics of everything for you.