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3 in journel on a stroker crank hold togeather
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big G puller
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PostPosted: Tue Jan 29, 2013 8:41 am    Post subject: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

will a 3 journel on a 9.5 stroker crank with a 7 3/4 bore hold togeather or break?
 
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Lynerd
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PostPosted: Tue Jan 29, 2013 9:20 am    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

Yes Lynn
 
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Josh Blackburn
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PostPosted: Tue Jan 29, 2013 9:28 am    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

Why risk it. 5020 3.5 journal. You can still fit 9.5 in easy.
 
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Mike N Mo
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PostPosted: Tue Jan 29, 2013 9:34 am    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

You'll be better off with a 3.375-3.5" journal size. The 3" will hold for a while, but the bigger ones will last a lot longer.
 
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big G puller
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PostPosted: Tue Jan 29, 2013 9:34 am    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

josh how much to do a 9.5 or 9.75 with 3.5 journels
 
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Brent50G
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PostPosted: Tue Jan 29, 2013 1:45 pm    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

Yes for a couple years as long as u keep it from detonating
 
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blackangus
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PostPosted: Tue Jan 29, 2013 7:58 pm    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

Ive got a3.5/8 with 3.5 journal in my 70 very tight
 
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Josh Blackburn
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PostPosted: Wed Jan 30, 2013 4:25 am    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

1500 includes flywheel-crank-driver assembly balanced as one unit.
 
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Tree Topper
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PostPosted: Wed Jan 30, 2013 11:10 am    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

I have a 9.75 stroke, 6.375 bore, about 9 to 1 compression. Been running since 2004 with no problems yet. Has been pulled pretty hard in 10,200 lb. class many times. Works real well.
Oh yes it has a 3 inch journal!
 
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buickanddeere
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PostPosted: Wed Jan 30, 2013 12:20 pm    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

She has to last in order to place first
 
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Mike N Mo
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PostPosted: Wed Jan 30, 2013 1:27 pm    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

Tree Topper, Your 3" journal should be very reliable at 622 cu in. We're running 3" journals on A's with more cubes than that, and just replaced a crank after 6 years (before it broke). The engine in question will have 896 cubes, almost half again more than yours, and needs the bigger journal to have decent reliability. Mike
 
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Big G puller
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PostPosted: Wed Jan 30, 2013 3:41 pm    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

well iv been running this crank for 7 yrs with 3 in journels 7.5 block thats 832 cubes block went bad so if im gonna replace block to 7 3/4 im going with a new crank shaft befor it breaks
 
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buickanddeere
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PostPosted: Thu Jan 31, 2013 5:17 am    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

A 3.5" journal has 1.361 times more material than a 3.0" journal.
 
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Tree Topper
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PostPosted: Thu Jan 31, 2013 9:54 am    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

Yes I know this is not a very big G as compared
to what is being built these days, but this set up has worked very well for me. Been very reliable. Don't use the engine up very often even in heavy classes. Lots of fun.
 
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Indiana Ken
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PostPosted: Thu Jan 31, 2013 7:12 pm    Post subject: Re: 3 in journel on a stroker crank hold togeather Reply to specific post Reply with quote

buickanddeere wrote:
(quoted from post at 06:17:31 01/31/13) A 3.5" journal has 1.361 times more material than a 3.0" journal.


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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