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Tractor Pulling Discussion Forum

Re: 3 in journel on a stroker crank hold togeather

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Author  [Modern View]

01-31-2013 05:17:31

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A 3.5" journal has 1.361 times more material than a 3.0" journal.

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Indiana Ken

01-31-2013 19:12:36

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 Re: 3 in journel on a stroker crank hold togeather in reply to buickanddeere, 01-31-2013 05:17:31  
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Yes, this would be correct for cross sectional area. The strength of the journal in tension is proportional to the cross sectional area. However, for a crankshaft, strength in torsion and strength in bending are more important than strength in tension.

If I could repeat your calculations for clarity: The cross sectional area is proportional to the diameter raised to the second power (diameter squared). For a 3" journal we have 3^2 = 9 and for a 3.5" journal we have 3.5^2 = 12.25. 12.25 divided by 9 = 1.361; increase in strength in tension.

The strength of the journal in torsion and in bending is proportional to the journal diameter raised to the fourth power. For a 3" journal we have 3^4 = 81 and for a 3.5" journal we have 3.5^4 = 150.06. 150.06 divided by 81 = 1.85; increase in strength in torsion and bending.

In conclusion the 3.5" journal is nearly double in stength for the more important torsion and bending modes.

With all respect - hopefully this adds to your post. Ken

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01-31-2013 19:51:37

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 Re: 3 in journel on a stroker crank hold togeather in reply to Indiana Ken, 01-31-2013 19:12:36  
It's all good with me. Left the torsion and bending out for simplicity. Actually the 4th power is going to take some refreshing and thinking about. It's been a while. Have to wonder with the airflow being limited by valve and and port size along with the short cam timing. Is gaining that last 1/2" to 1" of stroke that requires a skinny cam, 3" journals and a relocated cam really worth it?

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