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Had To Have My New Crank Turned... UPDATE
#1076196
09/17/11 12:12 AM
09/17/11 12:12 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I had mocked up my 416 with some old scuffed up bearings (I didnt have the new bearings yet) and I felt a snug spot in the couple of times I turned the crank... I thought it was the old bearings... I put the new bearings in and checked it again... it gets snug, so I took it over to crank shop... well he called me today to say the front is bent between #1 and #3 mains so I asked if he could straighten it but he prefered to cut it... its a new Scat/Mopar 4" that I've had for a couple of years... it was .002 out .... I dont know if I'll ever get this engine together... I should have gone smaller and used my billet crank thats just sitting around... that one is a 3.79 and I could have off ground it 
Last edited by MR_P_BODY; 09/23/11 11:58 AM.
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Re: Had To Have My New Crank Turned
[Re: MR_P_BODY]
#1076197
09/17/11 12:41 AM
09/17/11 12:41 AM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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That sucks...
Was it just a high spot out of round? You think he can just cut the high spot down, without cutting the other area of the same journal, or will he just turn the whole crank down some?
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Had To Have My New Crank Turned
[Re: MR_P_BODY]
#1076198
09/17/11 12:50 AM
09/17/11 12:50 AM
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Joined: Jan 2003
Posts: 3,719
Space Station #5
471Magnum
master
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master
Joined: Jan 2003
Posts: 3,719
Space Station #5
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Sounds like yours might have come out of the same batch as mine. Mine had a tight spot, but was within factory spec for both clearance and run out. I used it as is with no problem, but it's a street motor. I probably would have turned it if I wouldn't have had the bearings already, or if I had racing aspirations.
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.
Currently Mopar-less
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Re: Had To Have My New Crank Turned
[Re: Bob_Coomer]
#1076199
09/17/11 12:53 AM
09/17/11 12:53 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
That sucks...
Was it just a high spot out of round? You think he can just cut the high spot down, without cutting the other area of the same journal, or will he just turn the whole crank down some?
I just told him to cut it .010... so now I need a
set of new bearings... no big deal I have a few engines
with stock mains so I can use the bearings... I just
want this thing to spin freely
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Re: Had To Have My New Crank Turned
[Re: Performance Only]
#1076202
09/17/11 07:10 AM
09/17/11 07:10 AM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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I have a 3.55 stroke MOPAR crank bought it out of a running engine. Just a couple passes on it. The guy must have dropped it because it is bent. It will not turn at all with all the main bearings in. Moldex said they could straighten it. happens all the time. Would not need turning at all.
:
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Had To Have My New Crank Turned
[Re: MR_P_BODY]
#1076204
09/17/11 09:08 AM
09/17/11 09:08 AM
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Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
CHAPPER
master
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master
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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Had similar problems with a brand new MP 4" steel crank a few years ago. It was .0005" too large AND .0005" out of round,,,,turned mains .011" to get true and oil clearance. It has been run for over 10 years now with no problems. Seems a shame to have to work on a new crank...especially AFTER all had been balanced. They offered to replace it,,but,,it had been balanced and I decided to keep it and repair it.
If you like drag racing, support your local track.
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Re: Had To Have My New Crank Turned
[Re: smokinwoody]
#1076205
09/17/11 09:36 AM
09/17/11 09:36 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Im quite sure you are having the whole assembly balanced...
I have an Eagle crank in my 499,,,everything was balanced and checked out except the flange...would you believe it was 150 thousandths to thick and caused the converter to eat the hardened pump drive...thought I had the clearance,..
good thing you caught it...
these cranks are Chinese forgings..aren't they suppose to be machined here?
Yeah I already had it balanced... still no problem
with the balance... this work is being done to the
mains so that wont change
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Re: Had To Have My New Crank Turned
[Re: MR_P_BODY]
#1076206
09/17/11 09:42 AM
09/17/11 09:42 AM
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Joined: Jan 2003
Posts: 17,838
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,838
S.E. Michigan
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Well that sucks Mike, but sounds like you already took care of it. Wonder if it got dropped sometime before you got it, the way the front is off slightly it almost sounds like it got hit on the end.
Rich H.
Esse Quam Videri
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Re: Had To Have My New Crank Turned
[Re: ZIPPY]
#1076207
09/17/11 09:49 AM
09/17/11 09:49 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Well that sucks Mike, but sounds like you already took care of it. Wonder if it got dropped sometime before you got it, the way the front is off slightly it almost sounds like it got hit on the end.
I dont know... its never been dropped while I've owned
it and I got it new 
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Re: Had To Have My New Crank Turned
[Re: smokinwoody]
#1076208
09/17/11 10:02 AM
09/17/11 10:02 AM
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Joined: Dec 2009
Posts: 1,074
detroit, mi
POS Dakota
super stock
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super stock
Joined: Dec 2009
Posts: 1,074
detroit, mi
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Quote:
Im quite sure you are having the whole assembly balanced...
I have an Eagle crank in my 499,,,everything was balanced and checked out except the flange...would you believe it was 150 thousandths to thick and caused the converter to eat the hardened pump drive...thought I had the clearance,..
good thing you caught it...
these cranks are Chinese forgings..aren't they suppose to be machined here?
Scat is machined here...Eagle, I dunno.
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Re: Had To Have My New Crank Turned
[Re: POS Dakota]
#1076209
09/17/11 10:47 AM
09/17/11 10:47 AM
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Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
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Does this happen often w/ Scat cranks? I was going to order one today, until I read this. Would I have better luck with a K1? Kinda whizzes ya off, even if they are cheaper cranks. 
Yeah, it's got a smallblock.
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Re: Had To Have My New Crank Turned
[Re: 340B5]
#1076210
09/17/11 11:24 AM
09/17/11 11:24 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Does this happen often w/ Scat cranks? I was going to order one today, until I read this.
Would I have better luck with a K1?
Kinda whizzes ya off, even if they are cheaper cranks.
I cant say for fact... most of my SB stuff is 3.79
billet cranks... this is the first 4" forged stuff
that I have used
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Re: Had To Have My New Crank Turned
[Re: MR_P_BODY]
#1076211
09/17/11 11:54 AM
09/17/11 11:54 AM
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Joined: Oct 2006
Posts: 4,765
quick77rt
Parts Problem
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Parts Problem
Joined: Oct 2006
Posts: 4,765
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Sorry to hear that Mr P, Im really thinking that all these cranks are just the luck of the draw, like a water pump from a parts house most are right, some are not. I just had a K1 that was out of spec and a scat that had to be exchanged in the past year. People dog even eagle forged cranks, ive used to that checked out good, one has broken 4 mopar 4 speeds, 2 were liberty converted,the same crank made it through a nitrous issue, a hydrolock issue cought at startup and idle, and now has been hit with a 275 shot on a controller, and this last time apart magged fine and is still on the 3 year old calico coated bearings and spins like its on roller bearings. Would I buy another eagle crank today...id have to think it over as there steel crank now seem to cost like the others, scat, K1 and I feel the overall chance of getting a better quality unit overall would be btter with scat or K1. Ive been looking alot at the MP cranks going around for sale and have wondered for the lil extra cost thay ask for maybe the quality might be a bit better, but now I wonder and revert back to the luck of the draw thought. I just popped for the very budget minded offset crank and older heavy pistons,oem rods listed on here for $200 bucks I thought id roll the dice in an old school build to see if kept under 6k and 500hp which will tell me if some of these $1500 cast stroker kits are just overpriced junk when the same can be acheived with almost oem parts. Back to the MP cranks, the cost is more, and maybe yours did get dropped along the way prior to you getting it or just a glitched crank... I wonder if and what some of these companies internal records would show on quality control issues during the whole process as well as the return/exchange failure rate, ect... Anyways, sorry for the lil rant...you will get it sorted out, you always seem to fix every issue in short order 
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Re: Had To Have My New Crank Turned
[Re: 340B5]
#1076212
09/17/11 12:25 PM
09/17/11 12:25 PM
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Joined: Dec 2009
Posts: 1,074
detroit, mi
POS Dakota
super stock
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super stock
Joined: Dec 2009
Posts: 1,074
detroit, mi
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Quote:
Does this happen often w/ Scat cranks? I was going to order one today, until I read this.
Would I have better luck with a K1?
Kinda whizzes ya off, even if they are cheaper cranks.
I'm of the opinion that scat cranks are pretty good pieces.
I've bought a cast 4 inch from them and also a forged 4 inch superlight which is a gorgeous piece for the money.
Both were well within spec. I agree with a previous gentleman's post regarding luck of the draw. To think there is ANY company that can keep tolerances we demand ALL THE TIME in mass produced stuff is impossible. Mistakes will be made and there will be inconsistency. You can't avoid it.
But in reality, this is NOT A PROBLEM within reason and is why we check things in the first place.
As far as brand goes...individuals often dont want to admit their high dollar piece came out of spec...I recommend asking a machinist since they look at a crank for what it is and not the logo etched on the weight, and it's their job to make it fit. They will likely give you a far more unbiased opinion.
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Re: Had To Have My New Crank Turned
[Re: HPMike]
#1076214
09/17/11 04:00 PM
09/17/11 04:00 PM
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Joined: Jan 2007
Posts: 3,695
nc
emarine01
master
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master
Joined: Jan 2007
Posts: 3,695
nc
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Quote:
ALL Chinese cranks I use get drop shipped right to the crank grinder-then to my shop. I'd say that it's pretty common to have issues. 80% need some sort of rework. Part of the deal.
MB
All Chinese cranks should get drop kicked back to china,.... Just my opinion 
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Re: Had To Have My New Crank Turned
[Re: emarine01]
#1076215
09/17/11 04:45 PM
09/17/11 04:45 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
OP
Master
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OP
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
ALL Chinese cranks I use get drop shipped right to the crank grinder-then to my shop. I'd say that it's pretty common to have issues. 80% need some sort of rework. Part of the deal.
MB
All Chinese cranks should get drop kicked back to china,.... Just my opinion
Yeah I got this crank a FEW years back... I didnt
know who made the cranks for MP... at one time Callies
made them for MP
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Even if it is a cast crank 
