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12-02-2012, 11:25 PM | #1 |
Scooby Specialist
Member#: 337170
Join Date: Nov 2012
Location: hesperia, California
Vehicle:2003 wrx silver |
balanced ej20 crank
my wrx spun a bearing so im in a dilema to balance or to not balance the new OEM crankshaft. whats everybodys thoughts? and any clue what the pricing on it is? i figure i might as well balance the flywheel/pressure plate while im there right?
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12-03-2012, 12:26 AM | #2 |
Scooby Specialist
Member#: 237145
Join Date: Feb 2010
Chapter/Region:
SCIC
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Vehicle:02 WRX 12 FXT |
Correct me if I'm wrong. But isnt the flywheel already mostly balanced. And they mark the residual weight with a dot. Then per the fsm you make it 60 degrees from the dot on the pp
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12-03-2012, 12:27 AM | #3 |
Scooby Specialist
Member#: 337170
Join Date: Nov 2012
Location: hesperia, California
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12-03-2012, 08:55 AM | #4 |
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Join Date: Jul 2011
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Get your whole assembly balanced itll run like 150 from a machine shop
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12-03-2012, 10:07 AM | #5 |
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12-03-2012, 12:44 PM | #6 |
Scooby Specialist
Member#: 237145
Join Date: Feb 2010
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Vehicle:02 WRX 12 FXT |
for the installment, no its 60 or 120 degrees, and 120 degrees= -60 degrees. You cant install a 5mt flywheel and pressure plate with 130 degrees of separation. Unless you drill new holes....
I was saying correct me if im wrong about the need to balance these pieces as they are balanced from the factory to a degree or they at least tell you where the extra weight is. |
12-03-2012, 02:16 PM | #7 |
Scooby Specialist
Member#: 337170
Join Date: Nov 2012
Location: hesperia, California
Vehicle:2003 wrx silver |
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12-03-2012, 02:17 PM | #8 | |
Scooby Specialist
Member#: 337170
Join Date: Nov 2012
Location: hesperia, California
Vehicle:2003 wrx silver |
Quote:
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12-03-2012, 02:20 PM | #9 |
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Join Date: Nov 2011
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If you spun a bearing, the crankshaft may need to be reground. Have you checked the rod journal diameters? If it needs to be reground, I would suggest re-balancing. It wouldn't hurt either way, but it may not be necessary.
I'm not sure if you know this, but lack of oil is generally what causes a spun bearing. Have you looked into the cause of the spun bearing? |
12-03-2012, 06:16 PM | #10 |
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Its always good to balance your assembly if it's all new oem used aftermarket. Any bit out of balance can cause premature beating wear. It's just cheap insurance even if it's good
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12-03-2012, 10:59 PM | #11 | |
Scooby Specialist
Member#: 337170
Join Date: Nov 2012
Location: hesperia, California
Vehicle:2003 wrx silver |
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12-04-2012, 12:20 AM | #12 |
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Vehicle:1996 Gutted, built XP class Impreza L |
The killerB il pan and pickup are much better than stock.
Still, if you are rebuilding, get everything balanced by a good machine shop. Stock balancing is lousy at best, and if you rev to 8K or higher, the better balancing is required to keep your engine healthy. |
12-04-2012, 01:35 AM | #13 | |
Scooby Specialist
Member#: 337170
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01-07-2013, 08:14 PM | #14 |
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Location: Michigan
Vehicle:2002 WRX Silver |
What Crank did you end up getting? I just spun a bearing as well and I want to upgrade from a stock crank for strength and reliability reasons.
Thanks, Loof |
01-07-2013, 08:17 PM | #15 |
Scooby Specialist
Member#: 337170
Join Date: Nov 2012
Location: hesperia, California
Vehicle:2003 wrx silver |
I got a 2009 sti crank which is titanium nitride coated
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01-07-2013, 10:14 PM | #16 |
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Vehicle:02 Bugeye JDM STi OBP BLACK |
Do it, get the connecting rods and the entire rotating assembly balanced. Your engine will rev and run smoother.
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