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Old 11-23-2009, 07:42 PM   #1
jaironsti
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Default Specs on bearing clearances for the ej25

I am in the middle of doing a rebuild on my 06 sti and I went with h beam rods and standard bore forged pistons. stock sti crank. I have searched for the actual factory bearing clearances and have come up with multiple different answers. just wanting to know what is the stock specs on the the rods and mains.
thanks
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Old 11-24-2009, 10:18 AM   #2
smoky
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From Manual:

Connecting rod oil clearance:
Standard
0.017 — 0.045 mm (0.0007 — 0.0018 in)
Limit
0.050 mm (0.0020 in)

Crankshaft oil clearance
#1
STD 0.003 — 0.030 (0.00012 — 0.0012)
Limit 0.040 (0.0016)
#2
STD 0.012 — 0.033 (0.0004 — 0.0012)
Limit 0.045 (0.0018)
#3
STD 0.003 — 0.033 (0.00012 — 0.0012)
Limit 0.040 (0.0016)
#4
STD 0.012 — 0.033 (0.0004 — 0.0012)
Limit 0.045 (0.0018)
#5
STD 0.010 — 0.031 (0.0004 — 0.0012)
Limit 0.040 (0.0016)
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Old 11-24-2009, 10:26 PM   #3
jaironsti
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thankyou!!
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Old 11-25-2009, 12:58 AM   #4
CKxx
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Does everyone just run those clearances? Should I aim for the middle? Where do I find a list of the available sizes? What about for higher RPMs (8k?, 8.5k?)?

Also, #5 is the thrust bearing, correct?
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Old 11-26-2009, 10:40 AM   #5
DSM_Outback
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I like .0012 on the mains and .0015 on the rods with Rotella 5W-40 and an 11mm pump for daily flogger/weekend warrior type setups. Super loose clearance and thick oil (20-50) is old school IMO. Most modern engines don't have the main web flex that your grandpa's 409 did.
Phase II is #5 thrust. Phase I is #3.
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Old 11-26-2009, 11:54 AM   #6
mick_the_ginge
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Quote:
Originally Posted by DSM_Outback View Post
I like .0012 on the mains and .0015 on the rods with Rotella 5W-40 and an 11mm pump for daily flogger/weekend warrior type setups. Super loose clearance and thick oil (20-50) is old school IMO. Most modern engines don't have the main web flex that your grandpa's 409 did
Daily driver I would agree, running tighter clearances is the right thing to do.

Track cars, like mine, no way, which is why I run 1.5 thou main and 2 thou rod with 20w50 and it's not because of "flex" that I do that. IMO.

Care to share the thinking or data behind your observation?
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Old 11-26-2009, 01:54 PM   #7
Sinister redlines
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Well I am in agreement with Mick, and its not becuase of web flex but sheer strength of the oil.
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Old 11-26-2009, 09:31 PM   #8
jaironsti
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I know on every small block "race motor" Ive ever tore down the clearances have been "more open". I was wondering on the clearances as well on these motors. So from what Im gathering standard oil clearances by the manual for a street car is by far fine? I know that this has applied on other motors Ive assembled, but was wanting to make certain before I make final decisions on this motor.
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Old 11-27-2009, 12:22 AM   #9
CKxx
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Your BOV sounds lame
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Quote:
Originally Posted by mick_the_ginge View Post
Daily driver I would agree, running tighter clearances is the right thing to do.

Track cars, like mine, no way, which is why I run 1.5 thou main and 2 thou rod with 20w50 and it's not because of "flex" that I do that. IMO.

Care to share the thinking or data behind your observation?

What would you guys recommend for something in between DD and track car? It will go to a dragstrip a few times, (hopefully) a road course a bit, but will be most often used on the street. 8k rev limit. I'm sure it will get its fair share of use, but it won't live at 8500 or anything.
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Old 11-27-2009, 04:05 AM   #10
col5555
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Dont forget to check the "crush"
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Old 11-27-2009, 11:45 AM   #11
mick_the_ginge
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8k is way above the stock rev limit of the 2.5L.

If you were spinning to 7.5K max I would go with DSM_Outback - Upper end of the stock range, 0.0012 on the mains and .0015 on the rods with a 5W-40 for the street. When you take it to the track I would run a thicker oil as you generate far more heat and stress on the track.

These may work for a 8.5K rev limit. I spin to 8k on the dyno just for tuning but my car stops making power at 7k so I don't regularly rev that high.
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Old 11-27-2009, 03:43 PM   #12
DSM_Outback
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Quote:
Originally Posted by mick_the_ginge View Post

Care to share the thinking or data behind your observation?
I don't believe your clearances are that extreme as I recall taking a <Brand X/Name Withheld> Stage 2 shortblock apart that was .0025" on the rods.

I like a little bit on the loose side on a high cylinder pressure Subaru (which is pretty darn tight on just about everything else).
I believe "loose" clearances and big oil came from the old school hot-rodder zeitgeist of 20W-50 Race oil or even straight up 60, a high volume pump and .003" vertical oil clearance. This school of thought IMO is akin to cutting the ends of the ham off before you bake it (when one is asked why, the reply is "that's what my mother always did." When the mother is asked why, she replies that her "pan was too small for the whole ham.") Drag Racers and Circle Trackers did this back in the day to combat shearing (often due to main web flex); high bearing loads, poorer machining methods/equipment/materials and an almost non existent detergent package/oil formulation resulted in bearings getting the oil wiped off of them if clearances were too tight.

I know it's a commercial site but here's some info anyway...
http://www.joegibbsracingoil.com/tra...er/082106.html
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Old 11-28-2009, 11:10 PM   #13
CKxx
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Your BOV sounds lame
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Quote:
Originally Posted by mick_the_ginge View Post
8k is way above the stock rev limit of the 2.5L.

If you were spinning to 7.5K max I would go with DSM_Outback - Upper end of the stock range, 0.0012 on the mains and .0015 on the rods with a 5W-40 for the street. When you take it to the track I would run a thicker oil as you generate far more heat and stress on the track.

These may work for a 8.5K rev limit. I spin to 8k on the dyno just for tuning but my car stops making power at 7k so I don't regularly rev that high.
I apologize for being unclear. I should have noted that I have a built 2.0 block/ 2.5 crank, all balanced.
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