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#1
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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 |
#2
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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/ 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 Last edited by Steve C.; 10-08-2019 at 11:17 AM. |
#3
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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. |
#4
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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
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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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"The grass is not greener on the other side, its just fertilized with different $h!t" |
#6
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Quote:
Is the 2181 what it was adjusted to, or what is was before balancing ? |
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