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04-08-2014, 12:47 PM | #251 |
Scooby Specialist
Member#: 329822
Join Date: Aug 2012
Location: NorCal
Vehicle:2016 STi WRB |
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04-08-2014, 04:00 PM | #252 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Ok - I called the machine shop. They use a 600 grit polishing method which should not remove any material from the crankshaft but simply clean the surface up. It is not "micropolishing".
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04-08-2014, 05:27 PM | #253 |
Scooby Newbie
Member#: 386261
Join Date: Mar 2014
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anybody have a sti motor for sale
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04-08-2014, 05:33 PM | #254 |
Scooby Guru
Member#: 56203
Join Date: Feb 2004
Chapter/Region:
Tri-State
Location: south nj
Vehicle:00 RSTI Coupe Twin Scroll 2.5XTR EJ207 |
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04-08-2014, 08:50 PM | #255 |
Scooby Specialist
Member#: 239335
Join Date: Feb 2010
Chapter/Region:
W. Canada
Location: Edmonton, Alberta
Vehicle:2011 WRX WRB |
After the polish recheck and see if it is with factory specs. If so it is good to go.
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04-09-2014, 10:56 PM | #256 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Dang... So I've measured two rods with the King Bearings (STD) and the 7/16" ARP 2000's, and i'm coming up with clearances of .0036 and .0031... Is this normal for new rods? I've got the Brian Crower H-beam rods and the king standard size bearings. What bearings would I need to get around .0025 clearance??
Thanks! |
04-10-2014, 08:12 AM | #257 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Bumppppp
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04-10-2014, 11:25 AM | #258 |
Scooby Guru
Member#: 56203
Join Date: Feb 2004
Chapter/Region:
Tri-State
Location: south nj
Vehicle:00 RSTI Coupe Twin Scroll 2.5XTR EJ207 |
Proly from the polished crank?
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04-10-2014, 11:37 AM | #259 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
No, I compared the values to the oem spec. The crank was perfectly within spec as far as the crank pins are concerned.
I measured the inner diameter of the rod with bearing (2.0506) installed and subtracted 2.0470". That's how I got the clearances. |
04-10-2014, 11:50 AM | #260 | |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
One thing I thought was weird is I e-mailed Dustin at BC to ask for torque specs / special procedures from them for torquing the ARP2000 rod bolts into the H-Beam rods.
Here's what he said. Quote:
I'm wondering if they need to be tighter, which is causing these larger than usual rod bearing clearances. |
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04-10-2014, 12:25 PM | #261 |
Former Vendor
Member#: 383547
Join Date: Mar 2014
Location: Danville Virginia
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A 2000 bolt 7/16" diameter thread would need around 80 lbs with moly to get the correct stretch, depending slightly on the length. Typically rods come with torque specs for you to use if you do not have a stretch gage. These torque specs are on average about 15% less than the perfect torque/stretch amount, perfect being 75% of the yield of the bolt. This is not a published fact, it is what myself and other machinists I know have noticed over the years. We think that they supply you with a lesser torque value so that there's no danger of a defective torque wrench or operator to over torque the bolt, surpassing the 75% yield. All rods need proper vetting before being used, checked for correct stretch/torque and then size after reaching the correct torque. That 45 makes no sense to me.
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04-10-2014, 12:30 PM | #262 | |
Former Vendor
Member#: 383547
Join Date: Mar 2014
Location: Danville Virginia
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Quote:
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04-10-2014, 12:32 PM | #263 | |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Quote:
Hmm - I just called Dustin, and he said that the actual bolt diameter is 3/8", which is why he gave me the torque specs he did. He said the 45ft/lb for the 3/8" should be right. How should I approach adjusting the rod clearances are this point? Last edited by BeastianSTI; 04-10-2014 at 12:52 PM. |
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04-10-2014, 01:56 PM | #264 | ||
Former Vendor
Member#: 383547
Join Date: Mar 2014
Location: Danville Virginia
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Quote:
Quote:
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04-10-2014, 02:20 PM | #265 | |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Quote:
I suppose i'll drop the rods off to my machine shop to have them check them out. What specifically should I ask them to check? |
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04-10-2014, 03:35 PM | #266 |
Former Vendor
Member#: 383547
Join Date: Mar 2014
Location: Danville Virginia
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Ask the shop if they have a stretch gage and can measure the stretch on your rods and note the torque req'd to get there. Bring them the sheet that you got with the rods, it should give the stretch amount. At this point they need to measure the rods for oor and size compared to the stock spec. Not all shops know that this is req'd, if they are among them, then find another shop.
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04-10-2014, 03:46 PM | #267 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Dang - it really sounds like there isn't a whole lot I can do to put this engine together if everything requires a machine shop to measure stretch of bolts etc... I thought rods would have been OK to just torque to spec in the specified sequence. Becoming a lot more complex :/
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04-11-2014, 10:03 AM | #268 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Hey guys, i'm sure we've all seen that video on youtube where "subaru-mike" assembles the motor:
https://www.youtube.com/watch?v=-gmtEQ1GpmA I was going to follow this for torquing the case halves together to measure my main bearing clearances. I noticed that he says go to 37 ft/lbs for the large bolts, and 20 ft/lbs for the smaller ones. This does differ from the manual, but i'm wondering if going to 37ft/lbs could be a substitute for going to 14.8 ft/lbs -> tightening another 90*. Are there any good resources of tutorials on bolting the case halves together? |
04-11-2014, 10:04 AM | #269 | |
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TXIC
Location: TX
Vehicle:2002 Bugeye Haltech GTX3584RS |
Quote:
Dude youre not building a uber precision race motor. These things were designed by engineers to be slapped together with varying degrees of precision. You can get all crazy with stretch and quantify every little measurement if you want too but its wasted effort for a dd. Just torque that **** to spec and drive it. |
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04-11-2014, 10:10 AM | #270 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
I plan on putting doing 400 WHP... I've always lived by "do it right the first time, or don't do it at all".
I don't want an aluminum paperweight because I didn't follow the proper documentation. All I know is that the key to a good motor is precision in measurements and torque. I want to build it properly. Appreciate everyone's guidance on all of this. |
04-11-2014, 11:35 AM | #271 | |
Former Vendor
Member#: 383547
Join Date: Mar 2014
Location: Danville Virginia
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Quote:
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04-11-2014, 11:43 AM | #272 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Could I throw the cases on the engine stand? I found that the block wanted to move around a lot when I was torquing the bolts before.
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04-11-2014, 04:49 PM | #273 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
OK - confirmed with the machine shop that just finished up the heads and what not that they take the bolts right to 37 ft/lbs as well instead of the 17 - > 90* approach.
Everything measured out appropriately - i'm ready for assembly now!!! |
04-18-2014, 10:01 AM | #274 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Assembled the case with crank and rods last night. I couldn't find anything about bearing tang direction, so I put them all facing down.
Waiting for the piston ring filer to get here so I can adjust the top rings in each cylinder and get this puppy together |
04-20-2014, 07:32 AM | #275 |
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Join Date: Feb 2006
Chapter/Region:
AKIC
Location: Oneonta, NY
Vehicle:2005 WRX STi WRB |
Yup the wrx fsm calls for 37ft lbs i to do it this way.
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