3400 and 3100 forged or billet crank

[eliteweapons]

Does someone here know if there is anyone that makes a forged or billet crankshaft for the 3100 or the 3400? I am tired of waiting for mez at j-body performance. I have been waiting for a crank since october.

[TurboZ24]

RE: 3400 and 3100 forged or billet crank

I've never actually heard of anyone getting a crank from them, the "forged" one that is. I heard that there were some issues with it also that he was trying too sort out.

I still can't believe that he found someone willing too forge a short run of cranks and is able too sell them for like 960 US each, that means he probably paid less than 600-700 for each one. I know that a billet steel crankshaft custom would run you around 2500-3000.

On a side note, there is no reason too actually use a forged crank on the 3.1 unless you want a stroke that's different than a 2.8 (2.99") or a 3.1 (3.31") stroke. The stock cast crank basically isn't going too break.

[Guest]

RE: 3400 and 3100 forged or billet crank

I dont' know where else to get one except maybe from Scat. but I think they only did 2.8 cranks and who knows if any are left

have you emailed Jbody to see whats up or called them to see where its at?

if anything just cancel it if you dont' think you will ever get it.

[eliteweapons]

I am setting this up to run 20 psi of boost thats why I need a forged or billet. and yes I have been in contact with him constantly since november.

[bszopi]

Here we go again with the 20psi of boost. Curtis (turboz24) has the most stout 60V6 on this forum right now and he's telling you that you don't need a billet or forged crank. If you are that positive you need one, call some of the big companies out there (Crower, Scat, Milodon, etc) and pay to get one made. Otherwise, wait for JBP or just use the stock crank and make sure it stays oiled.

[TurboZ24]

On a side note, there is no reason too actually use a forged crank on the 3.1 unless you want a stroke that's different than a 2.8 (2.99") or a 3.1 (3.31") stroke. The stock cast crank basically isn't going too break.

That's what I said. my car is running low 12's, drive it all the time, rev too 8000 rpm and the crank is fine, no issues at all. I did run upto 23 psi before. I can promise you the crank isn't going too break. The tranny will blow, lots of other things will fail, but not the crank. You are fine as long as you make sure the oil isn't too hot and keep the crank well oiled like bszopi says.

You can call up Crower and they will make you a billet steel crank for around 2500 US.

[eliteweapons]

bszopi. I did call moldex in october when I was checking for cranks and jim said he would make me a billet one one (at that time) but it would take 16 weeks for 2400. crower said they wouldn't make one. J body said they had the cores in STOCK and would have them milled and sent out in 3 to 4 WEEKS! that was in october. So my judgement then was j body was cheaper and would get it faster forged was what I was looking for and I know I didn't need billet but that was the only option available. So I went with j body and now its july and still no crank. If I would have known this to be a problem I would have my billet crank already in the motor and just trying to get the issue with what computer will work on it solved. I have never know a cast crank to hold up to those kind of stresses too well thats why I wanted a forged crank. I am thinking of using a 3400 crank and getting it nitride coated. I was told it has a longer stroke than the 3100. Anyone know of a easier computer solution other than swapping out the 95 beretta comp and harness to a newer comp and harness?

[TurboZ24]

3400 has the same stroke as the 3100. 3.31"

As for an ECM, I would definately go aftermarket if you are willing too sink that amount of cash into the car.

[TurboGTU]

IIRC..only the small jurnal 2.8s needed steel cranks. Then GM addressed the jurnal issue and steel cranks basicly dissapeared.

I know someone with two steel destroke cranks (small or larg jurnal??don't know) that were bought from Ryan Folconer Racing Engines. Guess you won't be needing thise anyway.

[geoffinbc]

AHHH HA HA HA. Fuckin JBP is the biggest joke. Thoes bitched promise the fastest turn around times but you will be waiting 6 month to a year.

Sorry to laugh but it is a freaking miracle that place survives. Along with that their prices are crap too and the tech guys dont know shit. I tested them once on the install of Crane rockers on the 3400. They told me they bolted right in and you dont need anything

[SappySE107]

Get a 3500 crank and machine it to fit, thats all JBP does from what I have gathered.

[eliteweapons]

Hey Ben What is the difference between the 3500 and the 3100 cranks? I am trying to stay away from a stand alone ecu because I want the car fully functional. That is my main goal in this project.

[SappySE107]

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.

[bszopi]

http://www.60degreev6.com/index.php?name=PNphpBB2&file=viewtopic&t=4&highlight=3500+crank

[bszopi]

And here is a pic of the 3900 crank, which should be similar if not the same...

http://www.60degreev6.com/modules.php?set_albumName=3900&id=Crankshaft&op=modload&name=gallery&file=index&include=view_photo.php