That's pretty funny that right after I asked why no 24x you got one haha. Nice score.
Printable View
That's pretty funny that right after I asked why no 24x you got one haha. Nice score.
Yep. Haven't really been keeping my thread up to date because I've been wrenching on my beater a lot. I need 4wd this winter or I'm gonna die lol.
Yeah me too. I haven't been too into my Z lately because I'm looking for either an awd car or a 4x4 1500 silverado. I can't do another winter with my 180k saturn SL1, although the gas mileage is sweet. But I did just buy an electric cutout, a complete 02 ebony interior and next up is a 24x setup :)
I'll be following this..
It's time for some block work!!! Anyone know of a top notch machine shop in my area? My local "speed shop" is run by a bunch of con artists and I'd rather not go to them again. I know of a place out in Phoenixville run by a friend of my friend's old boss. I think they're called Lucky's Race Cars but I've never used them so I'm a bit weary.
I've also been playing around with a few different online graphers to get piston position/velocity/acceleration for different strokes and rod lengths. I really want to make some sort of spreadsheet/graph that spits out forces for a given piston/pin/rod weight to give you a rough idea of how all of the variables relate. Excel seems too stupid to do any of that but I'm not done playing with it. Here's what I have so far by just playing around with desmos.com/calculator:
Attachment 30068
Purple line is piston pin location relative to the crank axis
Orange line is piston velocity
Black line is piston acceleration
r=rod length
s=stroke
Hell yeah. Are you an engineer too or just a nerd?
Hahahaha, a little bit of both. I'm actually going for a degree in mechanical engineering. Over-thinking things is my specialty and I thought this would be a cool thing to check out. Science, bitch!!!!!!!!!
So, the more and more I look at this crank the less I like what I see. It doesn't mic up nicely compared to production spec, the radii aren't smooth, and the journals don't look polished. I haven't even put it in a block to check straightness... At minimum, this thing would need to be reground to 30 mains/20 rods and get sent out to be rehardened (I feel like a 1053 crank is going to be filled with cracks without it @ my goal). I'm sure it would stand up to a more mild build but whether or not it will survive in my motor is questionable and I can't say I want to find out. It's becoming a money pit and I could have something 4340 for around the same price.
I contacted the company that ground the thing... doubt they're going to get back to me. Even if they do and allow me to exchange it, I'm sure whatever crank they send will probably be the same. So unless I can find a steel 1 piece 3.48 GM crank that mics up nicely and is straight for a REASONABLE PRICE I'm SOL. Don't think that's gonna happen. Saw one on CL included in a rotating assembly for $500 but I don't think the guy wants to split it up. Even if he did, he would probably want $300+ for it which seems like a waste. I'd rather put that towards a new or used Compstar/Scat/Lunati etc. and at that point I'd want to stroke the damn thing.
So I'm at a crossroads. I think things are about to get expensive...
Guys... I have a confession to make
Attachment 30301
Attachment 30302
This was too good of a deal to pass up. It's an old Lunati Racer series crank, p/n CJ117BN. Should be better than the Sledgehammer. 4340, non twist forging (pretty sure it's USA), gigantic .140" fillet radii, 3.75" stroke... Mic'd up a few journals and it's already looking a ton better than my reman GM crank. I still need to take it to the machine shop to check for straightness, mag, and polish. Hopefully it checks out.
Gonna need new pistons but I can't say I'm partial to the Mahles anyway. I'd rather keep the longer 5.85" rod than switch to 5.7" in a stroker app so my Eagles are definitely staying. Now I have an excuse to get custom Diamonds!
New crank looks good. Hopefully it checks out. I just pulled the trigger on a set of custom diamonds myself.
Did some measuring. This is what I have so far for out of round. Things are looking good... my gamble might be paying off.
Mains
#1 .0003 max
#2 .0002
#3 .0001
#4 .0002
#5 .0001
Rods
#1 .0002
#2 <.0001
#3 .0001
#4 <.0001
#5 .0002
#6 <.0001
#7 .0002
#8 <.0002