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Old 10-08-2019, 10:41 AM
DarcyL DarcyL is offline
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Default stock 455 crankshaft bobweight spec

Hey- just wondering if anyone knew off hand what the crank bobweight value was for a stock 455 crank- Eagle lists their stock cast 455 crank bobweight at 2280 gm., but I would imagine that is targeting forged rods, and light forged pistons as in their rotating assemblies- Thanks,

Darcy

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Old 10-08-2019, 11:03 AM
Steve C. Steve C. is offline
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I have no clue. Curious, does the material make a slight difference. Armasteel or nodular iron casting. In an attempt to shed engine weight and improve fuel economy during the mid 1970s, Pontiac lightened its V-8 crankshaft of the era as well. The casting isn’t quite as robust as earlier examples.

https://www.pontiacdiy.com/pontiac-v...ormance-guide/

The obvious, since different rods and different pistons are different weights, it is impossible to make a crankshaft that is balanced "right out of the box" for any rod and piston combination.
All crankshafts must be balanced to your specific rod and piston combination.


.

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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/

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5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
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Last edited by Steve C.; 10-08-2019 at 11:17 AM.
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Old 10-08-2019, 07:45 PM
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AG AG is offline
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The one I built this year with Eagle rods and Icon forged pistons with a stock 455 crank was 2190.6 g.

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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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Old 10-08-2019, 08:20 PM
Steve C. Steve C. is offline
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'70 455 crank
6.625 Carrillo steel rods
Custom 4.181 JE pistons

2216.4 bob weight


.

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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/

Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
  #5  
Old 10-08-2019, 08:30 PM
AIR RAM AIR RAM is offline
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This is not a stock crank however for reference, the engine I'm building right now shows my bobweight with a 4.5 Scat crank/6.7 H-Beam's and Carillo Pistons has the bobweight @ 2181

I have a 455 crank for sale if interested. Its at the machine shop getting cleaned up... so I will have details once I get it back.

SPEED SAFE, NICK

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Old 02-21-2023, 09:54 PM
65sport 65sport is offline
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Quote:
Originally Posted by AIR RAM View Post
This is not a stock crank however for reference, the engine I'm building right now shows my bobweight with a 4.5 Scat crank/6.7 H-Beam's and Carillo Pistons has the bobweight @ 2181

SPEED SAFE, NICK
I know it's an old post but I'm curious.

Is the 2181 what it was adjusted to, or what is was before balancing ?

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