Author	[Modern View]
big G puller 01-29-2013 08:41:12 67.242.212.159 Report to Moderator	will a 3 journel on a 9.5 stroker crank with a 7 3/4 bore hold togeather or break? [Reply]   [No Email]
buickanddeere 01-31-2013 05:17:31 184.151.61.102 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 08:41:12   A 3.5" journal has 1.361 times more material than a 3.0" journal. [Reply]  [No Email]
Indiana Ken 01-31-2013 19:12:36 66.249.232.131 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to buickanddeere, 01-31-2013 05:17:31   Quoting Removed, click Modern View to see 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 [Reply]  [No Email]
buickanddeere 01-31-2013 19:51:37 209.240.120.229 Report to Moderator	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? [Reply]  [No Email]
buickanddeere 01-30-2013 12:20:06 184.151.63.251 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 08:41:12   She has to last in order to place first [Reply]  [No Email]
Tree Topper 01-30-2013 11:10:15 209.248.167.84 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 08:41:12   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! [Reply]  [No Email]
Big G puller 01-30-2013 15:41:55 67.242.212.159 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to Tree Topper, 01-30-2013 11:10:15   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 [Reply]  [No Email]
Mike n Mo 01-30-2013 13:27:14 13.13.123.100 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to Tree Topper, 01-30-2013 11:10:15   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 [Reply]  [No Email]
Tree Topper 01-31-2013 09:54:13 209.248.167.84 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to Mike n Mo, 01-30-2013 13:27:14   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. [Reply]  [No Email]
blackangus 01-29-2013 19:58:18 70.198.1.191 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 08:41:12   Ive got a3.5/8 with 3.5 journal in my 70 very tight [Reply]  [No Email]
Brent50G 01-29-2013 13:45:04 174.228.65.114 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 08:41:12   Yes for a couple years as long as u keep it from detonating [Reply]  [No Email]
Mike n Mo 01-29-2013 09:34:13 13.8.123.100 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 08:41:12   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. [Reply]  [No Email]
Josh Blackburn 01-29-2013 09:28:06 174.239.0.250 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 08:41:12   Why risk it. 5020 3.5 journal. You can still fit 9.5 in easy. [Reply]  [No Email]
big G puller 01-29-2013 09:34:42 67.242.212.159 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to Josh Blackburn, 01-29-2013 09:28:06   josh how much to do a 9.5 or 9.75 with 3.5 journels [Reply]  [No Email]
Josh Blackburn 01-30-2013 04:25:11 174.252.225.39 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 09:34:42   1500 includes flywheel-crank-driver assembly balanced as one unit. [Reply]  [No Email]
Lynerd 01-29-2013 09:20:06 72.192.116.62 Report to Moderator	Re: 3 in journel on a stroker crank hold togeather in reply to big G puller, 01-29-2013 08:41:12   Yes Lynn [Reply]  [No Email]