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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series. |
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#1 |
Zilvia FREAK!
![]() Join Date: Apr 2005
Location: Anchorage, Alaska
Posts: 1,174
Trader Rating: (8)
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![]() Looking to install my rods in my rb25 but i need the bearing clearances... anyone know or show me where to look it up ?
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#2 |
Nissanaholic!
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Factory service manual
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MRP Manufacturing |
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#5 |
Zilvia FREAK!
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Around .002"
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#7 |
Zilvia FREAK!
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Well, bearing clearances are all really up to a few factors,
1) Engines intended use 2) Hardware used 3) Oil viscosity and assuming you're doing an OEM rebuild with oem hardware around 2 thou would be in the limit, and on the "tighter" side which is what you'd want in a daily driver. Rod bearing clearances are also always slightly smaller than mains in case you were wondering about those too. I want to say in my SR my rods are around 2.5 thou and my mains are closer to 3 thou |
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#8 |
Zilvia FREAK!
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Also a "standard" ACL bearing is not the same size as a standard OEM bearing, the ACL will be slightly tighter due to it being coated.
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#9 |
Zilvia FREAK!
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Sorry to keep bumping this, but I just wanted to back what I said with some tangible evidence. The bearing clearances we run on David Briggs SR20det are:
Rods .002x" Mains .002x" And this is fairly standard like I previously stated. |
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#10 |
Zilvia FREAK!
![]() Join Date: Apr 2005
Location: Anchorage, Alaska
Posts: 1,174
Trader Rating: (8)
![]() Feedback Score: 8 reviews
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Thanks for all the replies. The more the better.
Its intended to be a summer DD / weekend warrior Cp pistons/ Manley h beams with acl main and rod bearings |
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#12 |
Zilvia FREAK!
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Then shoot for .0017-.002" for your rods and right around .002" for your mains. We run these on engines we build for a shop that specializes in Skylines. Also make sure to check your rod and piston manufacturers torque and clearance specs as those don't follow oem rules.
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#13 |
Zilvia FREAK!
![]() Join Date: Apr 2005
Location: Anchorage, Alaska
Posts: 1,174
Trader Rating: (8)
![]() Feedback Score: 8 reviews
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Thanks for the tips! Appreciate it a bunch!
And i already checked the rods and pistons and they came with the information for the specs so im good there... its just these bearing clearances that confuse me but i think i got it now You think .003 clearance from plasti gauge measurement is ok for mains? |
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#14 |
Zilvia FREAK!
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That's on the "looser" end of the spectrum, that's what my SR mains are and that's an engine I'm planning to drive harder and hotter, hence needing the room for expansion.
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#16 |
Zilvia FREAK!
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Well it's not going to initiate any code red self destruction sequences, you're still in spec. Just run a thicker oil like 10w30 and do 3k oil changes and you'll be fine. The extra clearancee is a cushion for thermal expansion that occurs with harder driving.
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#17 |
Zilvia Junkie
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You guys need to specify what unit of measure you are using.. metric or standard. the factory manual is metric... Most people including myself refer to an Inchs measurement.
.0015-.002 inchs is right where i have mine... 500-800whp 9k RPM going on its 7th year. |
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#18 |
Zilvia FREAK!
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I've been giving measurements in standard hence the (")
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Tags |
acl race bearing, clearance, rb25, rod bearing |
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