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Old 4th December 2016, 07:24 AM   #1 (permalink)
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Standard bearings? Not sure what to get?

I'm ready to fit my crank but getting a bit lost on bearing sizes. Need a bit of advise.

Working from the pulley end of the crank
Mains
54.955
54.956
54.952
54.954
54.954
54.954
54.953

Big ends
47.959
47.954
47.956
47.953
47.954
47.957

What's going to be the best bearing and size. It's a road car with trackdays throughout the year.
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Old 4th December 2016, 08:47 AM   #2 (permalink)
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Go for KING bearings throughout. You can also get Nismo if you are able to source them
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Old 4th December 2016, 09:15 AM   #3 (permalink)
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RB recommend 1 size up on standard for cooling.
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Old 4th December 2016, 09:56 AM   #4 (permalink)
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So is that +.025 on the mains an bigends??
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Old 4th December 2016, 11:53 AM   #5 (permalink)
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To work out the grades you'll need the numbers from crank and block.
Add those to each other per journal and thats the NEW grade when built.

Crank = 2 block = 3 means a grade 5 brg required there , however youll need to check vs measured It's important as both the inner and outer dimensions vary in production.

Rods are graded 0 or 1 too Jeff so another variable there mate.

On mine I worked out the gradings from the stampings , compared that to the actual measurements and then ordered.*As marked crank came out as 4, 4, 3.3.4.5.4 . As measured post polishing 2, 2, 2, 3, 2, 2, 2*

My oem rods were all grade 0 as marked crank pins 0, 1, 0, 1, 0, 1 now all nominal 0 grade with forged aftermarket rods

.The information you'll need is on page 130 -133 of tbe RB26 manual HTH

Copied from your other thread. ..
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Last edited by zimmersquirt; 4th December 2016 at 11:54 AM.. Reason: typo
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Old 4th December 2016, 12:54 PM   #6 (permalink)
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so...

from the fornt yours measures out to be a 3,3,3,3,3,3,3 for mains ( plus the block grading ) - what is it marked as ?

big end will be o/size as shes been reground based on your dims so US0.25 Grade = 25 in Nissan terms , still comes out a a generous regrind so Plastigauge FTW defo !

Graded select fit FTW for me dude.

Price wise Nismo Graded from JPY were £350.04 in Fedex 3 day shipping, obv VAT/Import may impact a little, was still cheaper than all the quotes I got in the UK though with max fees applied.

HTH
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Old 4th December 2016, 02:27 PM   #7 (permalink)
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Follow the book spec and you can't go wrong. Nismo graded is the best option out there right now.
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Old 4th December 2016, 05:35 PM   #8 (permalink)
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Quote:
Originally Posted by Supertec View Post
Follow the book spec and you can't go wrong
Why to RB not follow the book spec then?
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Old 4th December 2016, 06:59 PM   #9 (permalink)
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Quote:
Originally Posted by zimmersquirt View Post
To work out the grades you'll need the numbers from crank and block.
Add those to each other per journal and thats the NEW grade when built.

Crank = 2 block = 3 means a grade 5 brg required there , however youll need to check vs measured It's important as both the inner and outer dimensions vary in production.

Rods are graded 0 or 1 too Jeff so another variable there mate.

On mine I worked out the gradings from the stampings , compared that to the actual measurements and then ordered.*As marked crank came out as 4, 4, 3.3.4.5.4 . As measured post polishing 2, 2, 2, 3, 2, 2, 2*

My oem rods were all grade 0 as marked crank pins 0, 1, 0, 1, 0, 1 now all nominal 0 grade with forged aftermarket rods

.The information you'll need is on page 130 -133 of tbe RB26 manual HTH

Copied from your other thread. ..
I read this a couple of times and apologies for not understanding the above calculations. I rebuilt many engines in the past including very high BHP ones, but never come across something like this. The turbo engines I used to build using sputter bearings on the conrods.
I am new to skylines so excuse my ignorance.
Maybe someone would be good enough could take the time to explain the "grading".
Thanks
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