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Old 02-07-2013, 01:39 PM   #51
juanmedina
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Quote:
Originally Posted by aboothman View Post
Ya...whats +-.001" in your main clearances
I have the original king bearings and the following clearances where used on my engine:


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Old 02-07-2013, 02:37 PM   #52
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AWDtuning from flower mound Texas is using Kings new bearings in their Stage 5 engine for their Mexico STI. They use it in the Texas mile... I figure they will see how the bearings will do..
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Old 02-07-2013, 02:50 PM   #53
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Most people building these engines professionally use looser clearances on both the mains and rods. Specifically I'm asking has anyone used factory clearances on the new kings? Unless someone says they did it and they failed then I'm doing it.

Thanks Juan btw. I am pretty certain I will be doing it.
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Old 02-08-2013, 05:46 PM   #54
mboulton
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Originally Posted by ILikeBeans View Post
^^^ beat me by THAT much! I'm also putting these in my current build.

MB5382XPG are the mains in standard size, #5 thrust.

CR4125XPG are the rods in standard size, 52mm

Both are available in STDX for .001 extra clearance.
How are the XPG rod bearings different from the original XP line? The mains I understand the differences.
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Old 02-08-2013, 05:52 PM   #55
gotsugg
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^^ I have a set of both and they look no different really
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Old 02-08-2013, 06:04 PM   #56
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Quote:
Originally Posted by mboulton View Post

How are the XPG rod bearings different from the original XP line? The mains I understand the differences.
I was told by king they are identical
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Old 02-12-2013, 07:46 PM   #57
ILikeBeans
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I've not seen the previous line so I can't say. As far as stock clearances, what were you thinking of running? I ask because my XPG in standard give .0012 oil clearance - which is within stock range of .0007 - .0018 with a max limit of .0020.

Last edited by ILikeBeans; 02-12-2013 at 08:36 PM.
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Old 02-12-2013, 08:27 PM   #58
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Quote:
Originally Posted by ILikeBeans View Post
I've not seen the previous line so I can't say. As far as stock clearances, what were you thinking of running? I ask because my XPG in standard give .0125 oil clearance - which is within stock range of .0007 - .018 with a max limit of .020.
I think there are some decimal place discrepancies there but just for clarity, in inches
OEM rod clearance is .0008 to .0018
OEM main clearance is .0004 to .0012
In other words they would like .0008 mains and .0013 rods.
My xpg mains were .0007 on some. I would prefer they be .0012 to .0016 but I've also never seen a failed main bearing on these engines, only failed rod bearings. So I was curious if anyone had run these particular bearings that tight on the mains.

Last edited by kakarot09; 02-12-2013 at 08:41 PM.
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Old 02-12-2013, 08:39 PM   #59
ILikeBeans
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Discrepancies indeed, corrected.

If it weren't for the 11mm pump I plan on running, I wouldn't be scared of .0012 on the rods. I think I'll have the crank polished down to give .0016 - .0018 though.
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Old 02-12-2013, 09:07 PM   #60
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I ran .0011 to .0013 rods on a 2.0 last time. That was with .002 clearance for the #3 main and using acl bearings or maybe clevite I can't remember. They weren't 360 grooved but I think with these 360 grooves .0012 rods will be just fine unless you're revving it high. Pretty comfortable with that to 7500. Past that I'd open them.
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Old 02-12-2013, 09:15 PM   #61
ILikeBeans
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It won't see more than that *most* of the time, but it should still have breath at 8200 and may see that on occasion if I need to stretch a gear.
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Old 02-12-2013, 10:43 PM   #62
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Yeah for that I'd run them looser like you already planned.
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Old 02-21-2013, 04:08 PM   #63
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Well, I was debating using the bearings that tight but the way the bores measured has put a hold on my personal engine. I had the mains align honed and cylinders honed, but the cylinders aren't round with my torque plate. Can't really do anything until the machine shop has a chance to verify that my torque plate has the same results as theirs on a different engine, (cheaper to ship a torque plate than a whole block and torque plate) and then also they will likely want to double check my findings on the block if the torque plate results are the same. I know I would if I were them. However, I have another engine that I'm building for someone else now. I measured the main clearances at .0022-.0024 with a used not align honed block and used crank. I ordered a set of the .026 tighter mains now. I haven't measured rods yet because they didn't get here until yesterday. I think the tighter mains will work out the way I wanted.
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Old 02-22-2013, 08:59 PM   #64
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I ended up mixing STD and STDX halves to get .0017" on my rods. Machine shops weren't comfortable polishing that much and still keeping the journals flat. This way was cheaper anyway

So I ended up with mains at .0014-.0016 and rods at .0017. I'm happy with that.
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Old 02-23-2013, 09:08 PM   #65
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So anyone running the new King mains with some significant mileage ?
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Old 10-24-2013, 11:23 PM   #66
mavstang73
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Bumping an older thread but I wasn't quite ready to start another.

I've been reading up on the newer design King bearings and even though I plan on building a no more than 300-350hp daily driver I've decided to use them.
I like the idea behind the 360 oil groove and it makes a lot of sense.

The spun bearing motor I'm rebuilding lost rods 2 and 3 so obviously they are the weakest links when it comes to oiling.
I should add I didn't break this motor. Picked it up as a spun long block. I don't want to get into the method of failure here.
I'm making all the right moves to fix it. This ain't my first rodeo.

Finally I'll get to the point now.

The OEM bearings have been made lead free and harder to match the hardened cranks. What does this mean to someone who wants to use an aftermarket supplier specifically King?
Do I need to use a pre 07 crank with aftermarket bearings?

Haven't seen any documentation pointing one way or the other so far.
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Old 10-25-2013, 04:15 AM   #67
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No the crank can be diamond hard and you'd still have your pick of bearings because the bearing is intended to be softer than the crank. You can use whichever bearings you like with the nitrided cranks.
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