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03-27-2014, 10:33 PM | #226 |
Scooby Guru
Member#: 56203
Join Date: Feb 2004
Chapter/Region:
Tri-State
Location: south nj
Vehicle:00 RSTI Coupe Twin Scroll 2.5XTR EJ207 |
and the other alternative is a block guard/closed deck like outfront motorsports and a few others do.
Don't over think this man.. all you need is pistons and good rods....Hell JR went 10.0 @ 142mph with a stock sleeved piston/rod motor w/ a 6466
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03-28-2014, 01:45 AM | #227 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Yeah true... I'm thinking about just going for the gt35r lmao
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03-31-2014, 08:02 PM | #228 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Hey guys, so my Brian Crower H-Beam rods w/ ARP2000 bolts, as well as my 99.75mm CP Pistons came in the mail! I'm starting to review the notes on assembling the piston rings, and there doesn't seem to be a niche on one of the rings that goes around the expander.
Are there any good references out there for showing piston ring installs on a WRX / STi? Oh, and there aren't any dots on the rings, but the 2 thick rings have "n25" on one side. Does the plated thick ring be the most upper ring, relative to the top of the piston ( valve relief side ), or is it the other iron looking one with no shine? OH - and is the expander ring supposed to overlap itself, or should the tips between the gap touch? Thanks guys! |
04-01-2014, 12:30 AM | #229 |
Former Vendor
Member#: 383547
Join Date: Mar 2014
Location: Danville Virginia
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Any mark on a compression ring indicates the "up" side. Yes the plated ring is the top ring, non plated is 2nd. No, the expander never overlaps, the ends butt up. It will be obvious when you get to installing them. Top ring grooves should be 180 apart, expander gap is typically located over the pin end, 2 rail gaps one inch either side of expander gap. I don't know what you mean by no "niche" on one ring.
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04-01-2014, 01:06 AM | #230 | |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Quote:
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04-01-2014, 01:07 AM | #231 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Should I be able to install the piston rings before bringing them to the machine shop, or would that make it a PITA for them?
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04-01-2014, 07:18 AM | #232 |
Former Vendor
Member#: 383547
Join Date: Mar 2014
Location: Danville Virginia
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Put them on last, between you and the shop handling them, one might get damaged. Plus you'll want to check the ring gap after the machine shop is done with the block.
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04-01-2014, 01:16 PM | #233 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Just dropped the pistons and case bolts off at the machine shop. They're going to diamond hone torque plate the cylinders for the .003" ptwc, and measure the main clearances for me.
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04-01-2014, 01:17 PM | #234 |
Scooby Guru
Member#: 56203
Join Date: Feb 2004
Chapter/Region:
Tri-State
Location: south nj
Vehicle:00 RSTI Coupe Twin Scroll 2.5XTR EJ207 |
you drop your heads studs off also??
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04-01-2014, 01:21 PM | #235 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Oh, yes. They've had my case halves and head studs for about a week now. They measured the bores for me, and I've delivered the pistons to them finally Really hoping I don't need a line bore on this block ... lol - already looking at an unexpected expense of $600 for the heads |
04-02-2014, 09:32 AM | #236 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Hey guys,
If i'm planning on running up to 30lbs of boost, should I leave the PTWC at the .003" that CP puts on their spec sheet? |
04-03-2014, 03:45 PM | #237 | |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Quote:
The King rod bearings (Standard size) came in the mail today! I'm going to measure each of them this weekend to make sure they're all in spec. Hoping to get the block back from the machine shop tomorrow~ |
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04-03-2014, 05:15 PM | #238 |
Scooby Specialist
Member#: 217563
Join Date: Jul 2009
Chapter/Region:
South East
Location: Eden NC
Vehicle:2006 Sti 12.68 @ 108 321WHP 422WTQ dynojet SAE |
You should contact CP on this. Typically 2618 alloy has PTW of 0.0035". To loose you promote ring wear and little noise. To tight you risk have piston swell and seize in the bore.
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04-04-2014, 09:04 AM | #239 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Yar, the spec sheet said .003" pretty much. There were no provided ranges as part of the instructions :S
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04-04-2014, 09:50 AM | #240 |
Scooby Specialist
Member#: 239335
Join Date: Feb 2010
Chapter/Region:
W. Canada
Location: Edmonton, Alberta
Vehicle:2011 WRX WRB |
Although engine builders have ran them at 0.0025" and haven't seen scuffing. It all depends on how much power you want to push. 400whp and 0.0025 would more than likely be fine and the engine would last a good amount of time. 700whp it would seize in the bore due to more heat at that ptw.
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04-04-2014, 10:08 AM | #241 | |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Quote:
.003" at around 400-450 WHP probably, MAX. I agree though |
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04-04-2014, 10:48 AM | #242 | |
Scooby Specialist
Member#: 217563
Join Date: Jul 2009
Chapter/Region:
South East
Location: Eden NC
Vehicle:2006 Sti 12.68 @ 108 321WHP 422WTQ dynojet SAE |
Quote:
Me personally run it more in the looser side as it will last just as long and you run less risk of piston seizing. Also same goes for the ring gap. If you are playing with built motors and high boost you should expect to rebuild motor more often. Built motor isn't going to be same life as oem motor. |
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04-04-2014, 12:05 PM | #243 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Looks like the block is about ready to be picked up. Good news!! They said there weren't any issues with the main being out of round, etc!
I'll be receiving a granular list of the measurements that i'll post here once the time comes. Hoping to be able to buy standard sized main bearings. Not sure if I should go with the King XPG Main bearings, Cosworth, or OEM. Anyone have input/experiences with these? |
04-04-2014, 05:34 PM | #244 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
SWEET! Got the short block back from the machine shop.
No decking was needed - surface was perfectly level. No line bore needed - all main surfaces were right in spec; i'm going to pick up some STD main bearings The shop is going to polish up my crank and do the heads for 400! |
04-05-2014, 10:27 PM | #245 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
After doing some reading, I'm considering if I should meticulously measure the rods bearing clearances or not. I've hear that it's better to run looser clearances than tighter, but I think since the crank is in good shape and will be polished, I can get away with all standard king bearings. What do you guys think ?
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04-06-2014, 08:47 PM | #246 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Bumpppp
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04-06-2014, 09:10 PM | #247 | |
Scooby Specialist
Member#: 217563
Join Date: Jul 2009
Chapter/Region:
South East
Location: Eden NC
Vehicle:2006 Sti 12.68 @ 108 321WHP 422WTQ dynojet SAE |
Quote:
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04-08-2014, 10:46 AM | #248 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Ok - thanks..
Machine shop just called and let me know that two of the intake valves were out of spec, and ALL of the valve guides were well past spec. No wonder they sounded louder than most lol. |
04-08-2014, 11:57 AM | #249 |
Scooby Specialist
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Join Date: Feb 2010
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W. Canada
Location: Edmonton, Alberta
Vehicle:2011 WRX WRB |
Beastian,
I agree with bswilmington on not polishing the crank. As for the bearings just order both king std and +0.0001. It honestly isn't much more. That way you should be able to hit the clearances you want to hit. If you haven't read this thread I suggest doing so. http://forums.nasioc.com/forums/show....php?t=2265011 |
04-08-2014, 12:39 PM | #250 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
Hmm ... i'm kind of torn because the machine shop saw the crank and said it definitely could use a polishing. You could feel tiny bumps / unevenness in a few of the surfaces. Should I call polishing the crank off and buy a brand new crank?
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