samuel082799 Posted December 24, 2019 Share Posted December 24, 2019 I have read a few post on oem bearings and race bearings, but none of them really answered my questions. I am building and ej255 with the goal of 500hp, the crank, rods, pistons are all new and forged. I was told that race bearings, in general shouldn't be used on streetcars because they don't hold up to daily driving. The cost isn't really important, I just want to get the correct part for my application. It just seems weird to me to be running oem bearings on a 500hp engine. What is the best choice for my application? What is the pros and cons to both? Link to comment Share on other sites More sharing options...
shralp Posted December 24, 2019 Share Posted December 24, 2019 Instead of possibly getting the wrong info from “the internets” why don’t you contact a reputable Subaru engine builder like IAG, Outfront Motorsports, or Rallispec and ask them? Link to comment Share on other sites More sharing options...
samuel082799 Posted December 24, 2019 Author Share Posted December 24, 2019 Instead of possibly getting the wrong info from “the internets” why don’t you contact a reputable Subaru engine builder like IAG, Outfront Motorsports, or Rallispec and ask them? Good idea Link to comment Share on other sites More sharing options...
Max Capacity Posted December 25, 2019 Share Posted December 25, 2019 Or call King Bearings and talk with one of the Engineers there. Or call one of the Subaru performance shops, talk with them, and buy what they recommend, from them. The customer service you will get will be priceless. Have them guide you during the process. Support those that support the Forum. https://legacygt.com/index.php?page=vendors& 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
samuel082799 Posted December 26, 2019 Author Share Posted December 26, 2019 I called outfront Motorsports because they were the shop who resurfaced and bored my block. He said to use king bearings, they hold up to daily driving just fine and he has never had problems with them. So that is what I am going with. Link to comment Share on other sites More sharing options...
devobuzz Posted December 28, 2019 Share Posted December 28, 2019 My engine builder used King bearings for my all forged rotating assembly on my turbo dodge engine. I have always heard positive reviews. Link to comment Share on other sites More sharing options...
d22597 Posted December 28, 2019 Share Posted December 28, 2019 Surprised no mention of Mahle. Subie-performance is a strong advocate. (See 5 min in) Link to comment Share on other sites More sharing options...
samuel082799 Posted December 29, 2019 Author Share Posted December 29, 2019 Surprised no mention of Mahle. Subie-performance is a strong advocate. (See 5 min in) I love watching subie- performance, I totally forgot about that, I'm going to look into that as well Link to comment Share on other sites More sharing options...
Scottydunno Posted December 30, 2019 Share Posted December 30, 2019 My engine builder used King bearings for my all forged rotating assembly on my turbo dodge engine. I have always heard positive reviews.You don't say? You have any part numbers? Scotty Link to comment Share on other sites More sharing options...
devobuzz Posted January 1, 2020 Share Posted January 1, 2020 You don't say? You have any part numbers? Scotty You want part numbers for a turbo didge?? Link to comment Share on other sites More sharing options...
Scottydunno Posted January 1, 2020 Share Posted January 1, 2020 You want part numbers for a turbo didge??Yes... I still own one.... Scotty Link to comment Share on other sites More sharing options...
devobuzz Posted January 1, 2020 Share Posted January 1, 2020 Sorry...just checked my spreadsheet. I dont have part number documented. I can try to find out if you need it? Link to comment Share on other sites More sharing options...
Andy_Mac Posted January 2, 2020 Share Posted January 2, 2020 (edited) What’s the pricing like between king and OEM stateside? Down these ways King are more commonly used on cheaper builds due to them being considerably cheaper than sourcing the correct factory ones. Quite a few shops doing big power builds will only use OEM ones as the tolerances are apparently much better. This is all for 2.0 engines but cant see there being any reason why this wouldn’t apply other than the longer stroke adding slightly different loading conditions. Edited January 2, 2020 by Andy_Mac 2000 Legacy B4 RSK - SOLD 2006 Legacy BP5 GT Spec B wagon - Garage Thread 2011 VW T5 van 2.0L of turbo diesel awesomeness Link to comment Share on other sites More sharing options...
samuel082799 Posted January 18, 2020 Author Share Posted January 18, 2020 What’s the pricing like between king and OEM stateside? Down these ways King are more commonly used on cheaper builds due to them being considerably cheaper than sourcing the correct factory ones. Quite a few shops doing big power builds will only use OEM ones as the tolerances are apparently much better. This is all for 2.0 engines but cant see there being any reason why this wouldn’t apply other than the longer stroke adding slightly different loading conditions. Oem bearings are alot more expensive than king bearings. up to 100 dollars more depending on the type of king bearing you get. Ive heard that kings tolerances are the best in the business, if you vist there website they brag about it alot. The shop i called said they only use king bearings. I think it has something to do with the material in the kings being softer and more forgiving than the oem bearings. They also told me that they run +.001 oil clearence on the rod bearings on higher power levels with an 11mm oil pump. Link to comment Share on other sites More sharing options...
pdXammo Posted January 18, 2020 Share Posted January 18, 2020 Oem bearings are alot more expensive than king bearings. up to 100 dollars more depending on the type of king bearing you get. Ive heard that kings tolerances are the best in the business, if you vist there website they brag about it alot. The shop i called said they only use king bearings. I think it has something to do with the material in the kings being softer and more forgiving than the oem bearings. They also told me that they run +.001 oil clearence on the rod bearings on higher power levels with an 11mm oil pump. The metallurgy behind this makes oem bearings better with oem cranks. Forged cranks should be used with softer bearings like kings. Just as important when matching pads and rotors. Mis match will lead to premature wear of the softer component. Link to comment Share on other sites More sharing options...
samuel082799 Posted January 18, 2020 Author Share Posted January 18, 2020 The metallurgy behind this makes oem bearings better with oem cranks. Forged cranks should be used with softer bearings like kings. Just as important when matching pads and rotors. Mis match will lead to premature wear of the softer component. I am running the nitrited oem Subaru crankshaft which is forged, I wonder what bearings are recommend for those. I know they were never available in our cars or if they were available in any factory cars at all. I know for sure I will be running Kings. It's probably a good idea to have an oil pressure gauge when doing upgrades like that so you can hopefully pull the motor before you throw a rod through the block if anything were to go wrong Link to comment Share on other sites More sharing options...
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