Performance difference crank weight... light VS heavy
#428426
08/04/09 12:53 PM
08/04/09 12:53 PM
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B3422W5
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All else being the same, just wondering what affect going from a roughly 70 pound crank to a 40 pound crank would make performance wise(other than taking 30 pounds off the front of the car)
My steel 4 incher is close to 70 pounds, i know the callies and others come in a good bit less weight, and "trick" cranks can be 35-40 pounds.
Big "rev" difference???
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, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: Performance difference crank weight... light VS heavy
[Re: S/ST 3040]
#428428
08/04/09 01:19 PM
08/04/09 01:19 PM
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B3422W5
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How much ET might there be in knocking 30 pounds of weight off a crank...noticable??
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, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: Performance difference crank weight... light VS heavy
[Re: S/ST 3040]
#428432
08/04/09 02:28 PM
08/04/09 02:28 PM
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Joined: Oct 2003
Posts: 11,684 W. Kentucky
justinp61
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Quote:
Quote:
Who makes a 70# 4" crank?
Didn't I just see you somewhere else?
Are you harassing me?
I think the Dragonslayer, K-1, etc are all about 62-63 lbs.
IIRC my K-1 was 57 or 58# when I got it back from the machine shop after balancing.
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Re: Performance difference crank weight... light VS heavy
[Re: S/ST 3040]
#428435
08/04/09 02:45 PM
08/04/09 02:45 PM
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B3422W5
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i wanna say the mopar 4 inch steel crank i have is like 68-69 pounds, and i believe the callies is like 12 pounds lighter.
callies makes a bigger buck crank(magnum i think)that might be even lighter than the dragonslayer.
Last edited by B3422W5; 08/04/09 02:46 PM.
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, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: Performance difference crank weight... light VS heavy
[Re: B3422W5]
#428437
08/04/09 02:50 PM
08/04/09 02:50 PM
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B3422W5
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From Callies..the magnum XL series....
340 Mopar * Stroke Range of 2.600 to 4.250 * 2.100 - 2.000 - 1.8885 Rod Journal Diameters * 2.500 Main Diameter * Weight Range of 35 lb. to 47 lb.
so if the 4.25 is 47, a 4 inch should be even less that that somewhat...a big diff over almost 70 pounds
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, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: Performance difference crank weight... light VS heavy
[Re: B3422W5]
#428438
08/04/09 02:53 PM
08/04/09 02:53 PM
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Joined: Jan 2003
Posts: 4,616 Kissimmee Fl.
dusturbd340W5
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If remember correctly my Dragonslayer was 52# before balancing so it will be lighter now as it did not need any metal added.
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
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Re: Performance difference crank weight... light VS heavy
[Re: dusturbd340W5]
#428439
08/04/09 02:59 PM
08/04/09 02:59 PM
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Joined: Jul 2006
Posts: 4,595 On the south side of Nowhere
S/ST 3040
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Quote:
If remember correctly my Dragonslayer was 52# before balancing so it will be lighter now as it did not need any metal added.
My mistake.......Callies website does say that typical weight for SBM Dragonslayer is 52 lbs.
I need to quit trying to remember so many numbers.
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Re: Performance difference crank weight... light VS heavy
[Re: ScottSmith_Harms]
#428441
08/04/09 03:17 PM
08/04/09 03:17 PM
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B3422W5
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I cant seem to find the weight on my crank anywhere,(mopar performance 4 inch steel) it was purchased right before calles started offering the dragonslayer for mopar 4 inch a few years ago, but i am almost positive it was either 68 or 69 pounds, way heavier than the other numbers being thrown around.
Next freshen i am definately going to put a much lighter crank in it, for sure.
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, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: Performance difference crank weight... light VS heavy
[Re: ScottSmith_Harms]
#428442
08/04/09 03:19 PM
08/04/09 03:19 PM
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Joined: Jan 2003
Posts: 8,547 State College, PA
RyanJ
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Don, your SCAT 340 main crank is'nt anywhere near 70 lbs....
Callies 4" are usually in the 52-53 range
SCAT & K1 4" 2.50" mains in the 59 range, 360 mains around 61
SCAT offers 2 lightened versions of the 4", I sold Scott his, I think it was the mild lighten job & forget what it weighed before I shipped it.
Callies can do a sprint car lightening program on the Magnum stuff, & get them in the upper 30's with full aero wing style counterweights, star flange etc. Not cheap... & certainly not worth much ET at all in a high 9 sec combo.
Vacuum pump would be much better place to spend your $ than a light crank if you're looking for ET, especially with a light ring pack in your motor.
Last edited by RyanJ; 08/04/09 03:21 PM.
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Re: Performance difference crank weight... light VS heavy
[Re: S/ST 3040]
#428444
08/04/09 04:04 PM
08/04/09 04:04 PM
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Joined: Apr 2005
Posts: 1,880 USA
Ron Silva
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A lightened crank will make the engine rev noticably faster (along with light pistons and rods). The crank in my 474 R3W9 motor was 4.375 stroke (More than even some big block strokers). The crank was 45 pounds with 340 mains. Rods were 618 Grams/6.300 and pistons were 430 grams / 4.155 bore. But that thing revved like crazy. I literally made a Baby cry when the car had the 3-1/2" FLOWMASTERS on it, and kids were constanly asking me to rev it when I was at the track.
My take on performance is that the engine will react faster and so it will flash the converter a little faster and hit the tires a little faster. So if you needed to make the CAR react a little faster for some reason it would be an advantage. I am sure the engine will accelerate the car a little faster but it would be in the hundredths. Not much. If you are making a lot of HP the car and crank are just going to accelerate fast no matter what. So a heavy crank in a motor / car that has a lot of HP is not going to be a disadvantage.
But I would have all 4 rod pins drilled no matter what, because this is bad weight and will not help crankshaft strength at all. I also would still go for lighter weight rods and pistons as long as the cost or strength are not to the extreme. Lighter pistons and rods are easier on the crank and them selves. Especially important if you want to turn higher RPM.
SRT DEMON ONE SEAT
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Re: Performance difference crank weight... light VS heavy
[Re: S/ST 3040]
#428445
08/04/09 04:05 PM
08/04/09 04:05 PM
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Joined: Jan 2003
Posts: 11,718 Portage,michigan
B3422W5
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Last edited by B3422W5; 08/04/09 04:09 PM.
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, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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