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Re: Scat 4" cast crank? Will it break?
[Re: mshred]
#905121
01/15/11 01:44 PM
01/15/11 01:44 PM
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Joined: Dec 2009
Posts: 20,668
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,668
in a cattle trailer down by th...
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I've seen the cast Eagle cranks break with less HP on an automatic car.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Scat 4" cast crank? Will it break?
[Re: Guitar Jones]
#905122
01/15/11 02:10 PM
01/15/11 02:10 PM
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Joined: Jan 2009
Posts: 45
Iowa
Hey19
member
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member
Joined: Jan 2009
Posts: 45
Iowa
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I am running a 4" Scat cast crank in my all steel 68 barracuda. It runs 10.90's with a 904. I have had it 3 years and it works fine. I race every other weekend. I shift at 6000-6200.
Last edited by Hey19; 01/15/11 02:13 PM.
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Re: Scat 4" cast crank? Will it break?
[Re: Quicktree]
#905126
01/15/11 02:25 PM
01/15/11 02:25 PM
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Joined: Oct 2008
Posts: 1,015
Down South
DaKuda
super stock
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super stock
Joined: Oct 2008
Posts: 1,015
Down South
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Quote:
by the time you get it balanced and finished you will have spent enough for a forged crank..
Dont you have to have the forged crank finished and balanced as well...
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Re: Scat 4" cast crank? Will it break?
[Re: DaKuda]
#905127
01/15/11 02:33 PM
01/15/11 02:33 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
by the time you get it balanced and finished you will have spent enough for a forged crank..
Dont you have to have the forged crank finished and balanced as well...
yea but most take less to balance from what I understand (heavy metal)
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Re: Scat 4" cast crank? Will it break?
[Re: Quicktree]
#905128
01/15/11 03:01 PM
01/15/11 03:01 PM
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Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
rickstershemi
master
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master
Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
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Quote:
Quote:
Quote:
by the time you get it balanced and finished you will have spent enough for a forged crank..
Dont you have to have the forged crank finished and balanced as well...
yea but most take less to balance from what I understand (heavy metal)
Mine took a slug 5/8 x 1.200 to balance that cost a whopping $23 bucks  The balance job was $200 
Overall he was very impressed with the crank....me too 
Rickster
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Re: Scat 4" cast crank? Will it break?
[Re: DaKuda]
#905129
01/15/11 03:02 PM
01/15/11 03:02 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Yes you balance regardless of the material, but depending on the rest of the rotating assembly Forged cranks generally require less if any mallory slugs to balance. Cast cranks need the added mallory to balance. Each slug is like $50 and a crank can use multiple. Add in some dollars for labor and quickly your budget cast crank costs nearly the same as a forged piece but is still inferior strength wise.
The biggest thing that scares me about your build is the 4 speed. A Cast crank will live at 500 horsepower, but its not going to like you dumping the clutch and so on. A little piece of mind is worth a couple extra bucks. Thats my opinion.
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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Re: Scat 4" cast crank? Will it break?
[Re: Triple Threat]
#905130
01/15/11 03:07 PM
01/15/11 03:07 PM
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Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
Jeepmon
master
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master
Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
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Quote:
Yes you balance regardless of the material, but depending on the rest of the rotating assembly Forged cranks generally require less if any mallory slugs to balance. Cast cranks need the added mallory to balance. Each slug is like $50 and a crank can use multiple. Add in some dollars for labor and quickly your budget cast crank costs nearly the same as a forged piece but is still inferior strength wise.
The biggest thing that scares me about your build is the 4 speed. A Cast crank will live at 500 horsepower, but its not going to like you dumping the clutch and so on. A little piece of mind is worth a couple extra bucks. Thats my opinion.
well said
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Re: Scat 4" cast crank? Will it break?
[Re: Quicktree]
#905131
01/15/11 03:11 PM
01/15/11 03:11 PM
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Joined: Jan 2003
Posts: 11,728
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,728
Portage,michigan
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Quote:
by the time you get it balanced and finished you will have spent enough for a forged crank..
EXACTLY........
Few years back i broke a cast 4 inch stroker crank. I had upgraded my combo from high 10's to 10.30's and it broke after about 50 passes, and ruined the rest of my season. I learned the hard way to do it right the first time.
Like i love saying, spend the extra 500 bucks and get the good piece the first time. In the whole scheme of building a motor, 500 bucks is just a small fraction of the total build, so why scrimp, just wait till you can do it right, then you wont ever have to wonder 
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17
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Re: Scat 4" cast crank? Will it break?
[Re: B3422W5]
#905132
01/15/11 03:16 PM
01/15/11 03:16 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
by the time you get it balanced and finished you will have spent enough for a forged crank..
EXACTLY........
Few years back i broke a cast 4 inch stroker crank. I had upgraded my combo from high 10's to 10.30's and it broke after about 50 passes, and ruined the rest of my season. I learned the hard way to do it right the first time.
Like i love saying, spend the extra 500 bucks and get the good piece the first time. In the whole scheme of building a motor, 500 bucks is just a small fraction of the total build, so why scrimp, just wait till you can do it right, then you wont ever have to wonder
 but some have to learn the hard way.
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Re: Scat 4" cast crank? Will it break?
[Re: Triple Threat]
#905133
01/15/11 03:27 PM
01/15/11 03:27 PM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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The Scat cranks are great cranks for the money. I like them , use them a lot, BUT, it wouldnt be my choice for a 4 speed car.
Didnt you already buy a kit? I think I saw on BB Dart board you bought one from Coast High Performance ????
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Scat 4" cast crank? Will it break?
[Re: Triple Threat]
#905134
01/15/11 03:38 PM
01/15/11 03:38 PM
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Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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Quote:
Yes you balance regardless of the material, but depending on the rest of the rotating assembly Forged cranks generally require less if any mallory slugs to balance. Cast cranks need the added mallory to balance. Each slug is like $50 and a crank can use multiple. Add in some dollars for labor and quickly your budget cast crank costs nearly the same as a forged piece but is still inferior strength wise.
The biggest thing that scares me about your build is the 4 speed. A Cast crank will live at 500 horsepower, but its not going to like you dumping the clutch and so on. A little piece of mind is worth a couple extra bucks. Thats my opinion.
A valid opinion , if I do say so myself.
The four speed part is my concern too.
It " should " take anything you throw at it sounds a lot better than it " might " take anything you throw at it.
And a forged crank should take it.
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Re: Scat 4" cast crank? Will it break?
[Re: CHAPPER]
#905136
01/15/11 04:43 PM
01/15/11 04:43 PM
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Joined: Apr 2009
Posts: 3,425
Toronto
mshred
OP
master
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OP
master
Joined: Apr 2009
Posts: 3,425
Toronto
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hey guys, the kit i bought is from coast high performance and it cost 1300 for probe forged pistons, rings, bearins, scat I beams, and the 9000 cast crank including internal balancing at no extra charge. The only reason im worried is because i saw someone on another forum snap one in two peices with a 4 speed...but, there are alot of guys with cast cranks it seems with good luck...seems like there is a good and bad...Im going to call coast high and see how much it will be to upgrade, but if its outta my range, im gonna cross my fingers and go for it with the cast i was hoping to get real world experience with the cast and 4 speeds, but with the rarity of 4 speed racers, its kinda hard to. thanks, and if anyone else wants to share i appreciate any and all input
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Re: Scat 4" cast crank? Will it break?
[Re: mshred]
#905137
01/15/11 04:49 PM
01/15/11 04:49 PM
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Joined: Apr 2009
Posts: 3,425
Toronto
mshred
OP
master
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OP
master
Joined: Apr 2009
Posts: 3,425
Toronto
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Well Scat and Coast High are closed till Monday, but i just saw this on the scat site http://www.scatcrankshafts.com/scattechpdfs/Break_the_Nose.pdfhopefully because of the internal balancing it may help my cause...I just find it hard to understand why they would sell the cast crank in the 4" arm if it really is a weak point 
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Re: Scat 4" cast crank? Will it break?
[Re: mshred]
#905138
01/15/11 04:50 PM
01/15/11 04:50 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
hey guys,
the kit i bought is from coast high performance and it cost 1300 for probe forged pistons, rings, bearins, scat I beams, and the 9000 cast crank including internal balancing at no extra charge. The only reason im worried is because i saw someone on another forum snap one in two peices with a 4 speed...but, there are alot of guys with cast cranks it seems with good luck...seems like there is a good and bad...Im going to call coast high and see how much it will be to upgrade, but if its outta my range, im gonna cross my fingers and go for it with the cast
i was hoping to get real world experience with the cast and 4 speeds, but with the rarity of 4 speed racers, its kinda hard to.
thanks, and if anyone else wants to share i appreciate any and all input
I would be worried with the 4 speed nad just a note, for $2400 you could have had a forged stroker kit.
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Re: Scat 4" cast crank? Will it break?
[Re: mshred]
#905139
01/15/11 04:52 PM
01/15/11 04:52 PM
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Joined: Jan 2003
Posts: 9,892
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,892
Weddington, N.C.
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I'd also put 500 hp at the limit, my 511 horse 427" small block Cobra has a cast crank with a 5 speed, but in a light car it's almost impossible to load the motor up very hard on the street. The heavier the car the more resistence/load you have countering the inherent twisting motion of the crank, if you get into a detonation situation under full-hook/high load and bad things can happen. If you're going to run on street tires I think 500 is safe in an A body, but if you're running Drag Radials or better and really plan on thrashing it around invest in a little extra piece of mind. As said by the time you balance a cast crank you don't wind up saving much over a forging
Last edited by Streetwize; 01/15/11 04:55 PM.
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