Bearing choice for lq4
Thread Starter
Teching In
Joined: Sep 2014
Posts: 49
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Bearing choice for lq4 Hey guys,
I got a question I need answered so I can build my motor. Im building a s480 turboed lq4 but I am using the stock crankshaft. Is it ok to use the King xp racing bearings on my car? It will see time on the street and I am hoping it will be close to 800+ hp.
I heard that the bearings are too hard and could potentially eat my crank.
I also see that they are designed for racing so I am wondering if they will be ok on the street.
Thanks for the help!
I got a question I need answered so I can build my motor. Im building a s480 turboed lq4 but I am using the stock crankshaft. Is it ok to use the King xp racing bearings on my car? It will see time on the street and I am hoping it will be close to 800+ hp.
I heard that the bearings are too hard and could potentially eat my crank.
I also see that they are designed for racing so I am wondering if they will be ok on the street.
Thanks for the help!
IMO if you want mileage- 150k or something (daily driver) I would use an OEM bearing... Or at least use a tight clearance and keep RPM to a minimum (around OEM redline is fine). By keeping tight clearances, using light oils, and RPM in check, you can use alot of OEM parts that will help keep a reliable engine.
If this is a race engine and only needs to go 8k or something... then it matters alot less, use whatever you want
If this is a race engine and only needs to go 8k or something... then it matters alot less, use whatever you want
I wouldn't want too tight of clearances with a turbo build. Turbo'd motors break down the motor oil a lot faster than na builds, so you'll be changing the oil a lot if you run thinner oil. A lot of people run shell rotella 15-40 on turbo builds.
I honestly don't know if the xp's would be good or bad to be honest with you. I can tell you that my buddy has about 6k miles on his set. He broke a ringland around 4k miles and when he changed the piston, the bearings looked brand new still. He's only around 675-700rwhp though, but it's on a stock crank. I'm also running the xp bearings and so far so good. We are both only shifting around 6000rpms though.
I was actually just doing some reading on the HP and XP king bearings. They say the HP's are supposedly for boosted applications, but they say they're geared more for track runs and maybe shirt circle track intervals. So I'm kind of curious of what everyone will say about those bearings too. I was kind of curious when I read up on them about using them with stock cranks.
I honestly don't know if the xp's would be good or bad to be honest with you. I can tell you that my buddy has about 6k miles on his set. He broke a ringland around 4k miles and when he changed the piston, the bearings looked brand new still. He's only around 675-700rwhp though, but it's on a stock crank. I'm also running the xp bearings and so far so good. We are both only shifting around 6000rpms though.
I was actually just doing some reading on the HP and XP king bearings. They say the HP's are supposedly for boosted applications, but they say they're geared more for track runs and maybe shirt circle track intervals. So I'm kind of curious of what everyone will say about those bearings too. I was kind of curious when I read up on them about using them with stock cranks.
Furthermore, Mazworx, a well known engine building / car racing company admits:
Your measurement is fine, and you do not need any extra clearance than what you have already. The "extra clearance for extra power" mentality is dated. With today's machining capabilities and oil technology that practice isn't needed. All of our engines at the shop are built to FSM spec whether it's a 200hp stock rebuild or a 1400hp drag engine.
Not saying what is right or wrong, but consider this. Since 1989, Nissan and Toyota have produced turbo engines which see 200,000+ Miles using a 0.0008" (yes, 8 tenths of a thousandth) of clearance in the rod bearings and produce over 100horsepower/Liter. They see regular oil changes and maintenance like any other engine and last as long.
Furthermore, Mazworx, a well known engine building / car racing company admits:
http://zilvia.net/f/showpost.php?p=6080003&postcount=2
Furthermore, Mazworx, a well known engine building / car racing company admits:
http://zilvia.net/f/showpost.php?p=6080003&postcount=2
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Not saying what is right or wrong, but consider this. Since 1989, Nissan and Toyota have produced turbo engines which see 200,000+ Miles using a 0.0008" (yes, 8 tenths of a thousandth) of clearance in the rod bearings and produce over 100horsepower/Liter. They see regular oil changes and maintenance like any other engine and last as long.
Furthermore, Mazworx, a well known engine building / car racing company admits:
http://zilvia.net/f/showpost.php?p=6080003&postcount=2
Furthermore, Mazworx, a well known engine building / car racing company admits:
http://zilvia.net/f/showpost.php?p=6080003&postcount=2
Don't compare inline Japanese 4 cylinder engines to pushrod V8's.
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I think it matters more about how you build the engine and how you machine and modify the block for racing preparation, rather than the number of cylinder it has. Its not like the journals of the 6 cylinder engines are a different kind of round shape than the journals of an eight.
hey hey now. I come in peace. They build all kinds of stuff, some of it in the 1000hp/liter range. They have all their own machine shop and produce billet blocks on a CNC machine for example.
I think it matters more about how you build the engine and how you machine and modify the block for racing preparation, rather than the number of cylinder it has. Its not like the journals of the 6 cylinder engines are a different kind of round shape than the journals of an eight.
I think it matters more about how you build the engine and how you machine and modify the block for racing preparation, rather than the number of cylinder it has. Its not like the journals of the 6 cylinder engines are a different kind of round shape than the journals of an eight.
I'd have to see a 1200hp drag engine survive with .0008" oil clearance to believe it. The big power LS engines I've seen like that so far all ruin bearings and seize up.
Thread Starter
Teching In
Joined: Sep 2014
Posts: 49
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I wouldn't want too tight of clearances with a turbo build. Turbo'd motors break down the motor oil a lot faster than na builds, so you'll be changing the oil a lot if you run thinner oil. A lot of people run shell rotella 15-40 on turbo builds.
I honestly don't know if the xp's would be good or bad to be honest with you. I can tell you that my buddy has about 6k miles on his set. He broke a ringland around 4k miles and when he changed the piston, the bearings looked brand new still. He's only around 675-700rwhp though, but it's on a stock crank. I'm also running the xp bearings and so far so good. We are both only shifting around 6000rpms though.
I was actually just doing some reading on the HP and XP king bearings. They say the HP's are supposedly for boosted applications, but they say they're geared more for track runs and maybe shirt circle track intervals. So I'm kind of curious of what everyone will say about those bearings too. I was kind of curious when I read up on them about using them with stock cranks.
I honestly don't know if the xp's would be good or bad to be honest with you. I can tell you that my buddy has about 6k miles on his set. He broke a ringland around 4k miles and when he changed the piston, the bearings looked brand new still. He's only around 675-700rwhp though, but it's on a stock crank. I'm also running the xp bearings and so far so good. We are both only shifting around 6000rpms though.
I was actually just doing some reading on the HP and XP king bearings. They say the HP's are supposedly for boosted applications, but they say they're geared more for track runs and maybe shirt circle track intervals. So I'm kind of curious of what everyone will say about those bearings too. I was kind of curious when I read up on them about using them with stock cranks.
On a side note, I contacted King Bearings (VIA phone) and the technician said that I should definitely run the XP bearing even on the stock crankshaft. He just said to make sure that I keep it very clean and that I make sure the oil level never gets low. Also, he said to make sure I run main studs and have it align honed after to make sure I dont have problems later on. They were very helpful and I would recommend them if you have any other questions.
That is what I wanted to hear! Thanks man I appreciate it.
On a side note, I contacted King Bearings (VIA phone) and the technician said that I should definitely run the XP bearing even on the stock crankshaft. He just said to make sure that I keep it very clean and that I make sure the oil level never gets low. Also, he said to make sure I run main studs and have it align honed after to make sure I dont have problems later on. They were very helpful and I would recommend them if you have any other questions.
On a side note, I contacted King Bearings (VIA phone) and the technician said that I should definitely run the XP bearing even on the stock crankshaft. He just said to make sure that I keep it very clean and that I make sure the oil level never gets low. Also, he said to make sure I run main studs and have it align honed after to make sure I dont have problems later on. They were very helpful and I would recommend them if you have any other questions.
Thread Starter
Teching In
Joined: Sep 2014
Posts: 49
Likes: 0
thats good to know. what kind of oil would be best? it should be a quick lil guy lol I'm sure you will hear more of me.
There's different preferences for everyone, but my buddies all run shell rotella. I've read on here that quite a few guys run it too and I honestly thought he was pulling my leg about it until I started reading up on it. I'm sure there's better stuff out there to run, but it is dirt cheap and seems to work fine, so I'm going to keep running it lol. I usually change my oil about every 1500 miles though.