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If I go solid blocking, are dimensions smaller that 2x10 ok?

Thanks for all the help. I just finished sistering my cracked kitchen floor joists with 3 2x8 lvls. Wasn't fun but it the result is amazing... But I have a few questions.I removed 4 joist bay worth of cross bracing during the sistering process. Do I: 1. need to replace the cross bracing...

Does the angle iron require support? If so then I imagine I need to jack the damaged joist 3//8" off the bearing point?

Looking at some of the suggestions, sistering a 2x8 LVL (point to point) on one side will help. As for other side, I may just scab 2/3s of damaged area (8 ft scab). In addition, I may add new joists on either side of the damaged joist (8" o.c.). Only issue I have with this method is how do I...

I am re routing the electrical so it will not need to re thread into damaged joist. Since I am able to fully sister one end between bearing points, and sister the other side (albeit with only one end on a bearing point/mud sill), I figured I scab across I beam to gain bearing point access...

sorry, here's a better pic.http://files.engineering.com/getfile.aspx?folder=7519223e-7047-434b-95d8-7397569190ac&file=scab_joint__revised.jpg

Here's a more complete picture Maybe a 10 ft scab will hold? http://files.engineering.com/getfile.aspx?folder=f6f86427-ec67-40b0-9a0c-b6a36ce52534&file=scab_joint__(2).jpg

To be honest the 2x10 in question is cracked from the bottom up. An electrician drilled a fairly large hole in the bottom third of 2x10 and when the kitchen was finished the bending stress was enough to crack at the point. I simply want to sandwich the 2x10 and stabilize it.

finally here's the pic http://files.engineering.com/getfile.aspx?folder=3ddb480b-d084-4218-adf2-c0d09c0ef413&file=scab_joint_.jpg

As for adding joists 8" OC, I thought about that but am concerned doing so because the area in question resides under a finished kitchen with granite countertops. I fear the action of blocking the 2x8s will add stress to the floor above.

Sorry about that. I tried to post pic and I failed to go so. I tried the txt trick but when it posted spaces dropped out leaving an unintelligible mess.

Thanks for the quick reply. i have one more question. i noted that I cannot sister opposing side of 2x10 because they overlapped the 2x10s that span the floors. However, it is possible to sister a 2x8 on the opposing side of the 2x10, with one end bearing on the mudsill and the other end...

To all structural engineers: Can you sister an existing joist using smaller dimensional lumber? For instance I have a 12 ft span with 2x10s Douglas Fir spaced 16". O.C. I want to add 2x8 Douglas Fir sisters across entire span, to each bearing point(mudsill to center I beam), as I can easily...