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03-29-2013, 10:19 AM | #6101 | |
Scooby Newbie
Member#: 307835
Join Date: Jan 2012
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03-29-2013, 02:59 PM | #6102 | |
Scooby Specialist
Member#: 59837
Join Date: Apr 2004
Chapter/Region:
SWIC
Location: Nor Cal
Vehicle:2004 Spec-C Type RA What MAF? -Speed Density! |
Quote:
Depending on the sensitivity of your equipment the leak down may be below the repeatable measurement level. If you forgot your high school science lessons about accuracy vs. precision this would lead one to conclude that the result of 0% leak down is correct. If you truly had 0% leak down you could turn the motor over by hand to compress one of the cylinders and let it sit for a while like that with no loss of pressure, this is not the case in the real world. Even the best designed vacuum/pressure vessel systems in the world have some degree of leak back and your motor does not have the gas seals that these systems do. Less than 10% leak down is fine, and slight deviations between cylinders could be due to a small carbon deposit interfering with the valve seating or any number of things. Last edited by lukeskywrx; 03-29-2013 at 03:07 PM. |
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03-29-2013, 04:04 PM | #6103 |
Scooby Specialist
Member#: 224785
Join Date: Sep 2009
Chapter/Region:
MWSOC
Location: neenah
Vehicle:2005 wrx-jdm207 i went black... |
true that. we took my friends ej25 heads into a shop to ask a few questions and figured we would get the line, yeah you need valve work. WRONG. the guy basically said shine a flashlight into your heads and if u see no light then your good. when we tried it at home we saw light but after further inspections small bits of carbon were getting cause in the valve seat and hence the light could get thru. its a metal on metal seal. nothing special. it will amost always leak unless u have some super valve springs or something and perfect milling down to the 1/10000 of an inch.
i would have to agree. i have been told 8-10% max leakdown are good numbers. |
03-29-2013, 04:13 PM | #6104 |
Former Vendor
Member#: 178047
Join Date: Apr 2008
Chapter/Region:
SWIC
Location: AZ
Vehicle:02 WRX STI Spec C Black |
I have tested many many many V7 and v8 engines. When they are good, you cannot rotate the crank past TDC as ZERO air leaks past. Both hands on a breaker bar and they will not go past. The gauge bottoms to 0. Typical engines are 2 to 3%. These motors are very very tight.
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03-29-2013, 07:19 PM | #6105 | |
Scooby Specialist
Member#: 307912
Join Date: Jan 2012
Chapter/Region:
South East
Location: FL
Vehicle:1997 OBS V8 Ej207 Stimikey tuned |
Quote:
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03-29-2013, 09:10 PM | #6106 | |
Scooby Specialist
Member#: 239162
Join Date: Feb 2010
Chapter/Region:
BAIC
Location: Sacramento, CA
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Quote:
Any info in older motors? Or just v7/8 |
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03-29-2013, 09:29 PM | #6107 |
Scooby Specialist
Member#: 271412
Join Date: Jan 2011
Chapter/Region:
Tri-State
Location: avoca pa
Vehicle:05 ej207 wrx wagon wrb |
Delete sry
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03-29-2013, 11:04 PM | #6108 | |
Scooby Specialist
Member#: 59837
Join Date: Apr 2004
Chapter/Region:
SWIC
Location: Nor Cal
Vehicle:2004 Spec-C Type RA What MAF? -Speed Density! |
Quote:
Lets use some of those number things and do a quick calculation assuming NO leak down. From the area of the 92mm diameter piston you get ~9.6 sq inch and with a rough compression number of 120 PSI you get 1,150 pounds on the piston during a compression cycle. The stroke on our crank is 75mm or ~0.25 ft crank throw that ends up at 288 ft-lbs at the crank. So with a 2ft breaker bar you only need 144 lbs to turn over the motor. So either you have total sissy bird arms or are just talking out of your ass. Have you ever changed a timing belt? I am guessing not because you end up cranking over the motor by hand to align everything and it is not that hard. Stop telling people stupid things that are not true. Last edited by lukeskywrx; 03-30-2013 at 01:08 AM. |
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03-30-2013, 02:00 PM | #6109 |
Scooby Newbie
Member#: 241491
Join Date: Mar 2010
Vehicle:2005 wrx v7 ej207- stimikey tuned |
I would say no more then 20%cylinder leakage is still ok. Any thing more than that and you have a problem. I also agree with Luke that no matter what you have air is always going to find a way out. There is always leakage past the rings and valves.
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03-30-2013, 05:29 PM | #6110 |
Scooby Specialist
Member#: 307912
Join Date: Jan 2012
Chapter/Region:
South East
Location: FL
Vehicle:1997 OBS V8 Ej207 Stimikey tuned |
Good to know
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03-30-2013, 05:35 PM | #6111 |
Scooby Newbie
Member#: 38605
Join Date: Jun 2003
Vehicle:2000 impreza |
Installed my V8, and it idles/runs great. However I keep getting a p1306 CEL. I checked my wiring AVCS thrice(IAP wiring kit), removed the passenger side AVCS banjo filter, and swapped the solenoids(driver to pass, vice versa) and still get the code. The last test leads me to believe it an electrical issue but I can not figure it out. Any help?
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03-30-2013, 05:55 PM | #6112 | |
Scooby Guru
Member#: 6886
Join Date: May 2001
Chapter/Region:
Tri-State
Vehicle:MY01 EJ207 HTA35r AVCS ON! |
Quote:
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03-30-2013, 05:58 PM | #6113 | |
Scooby Specialist
Member#: 93206
Join Date: Aug 2005
Chapter/Region:
NESIC
Location: somerville, MA
Vehicle:02 WRX.... JDM V7/8/9 RA-R Rotated |
I had the same issue but it was due to the pins getting loose at the ecu plug. If all else fails check there.
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03-30-2013, 06:00 PM | #6114 |
Scooby Newbie
Member#: 38605
Join Date: Jun 2003
Vehicle:2000 impreza |
Which pins were loose? Do you recall? I swapped the 10,11 pins because they were incorrect per this searching this thread but still have the issue
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03-30-2013, 06:07 PM | #6115 |
Scooby Specialist
Member#: 93206
Join Date: Aug 2005
Chapter/Region:
NESIC
Location: somerville, MA
Vehicle:02 WRX.... JDM V7/8/9 RA-R Rotated |
The solenoid pins were loose at the ecu from when I let a friend move them with too large of a screw driver. He ended up expanding the female pin from the harness which did not allow for a good contact. Pull the solenoids and cycle the ignition to ensure that they are actuating. Also check the grounds on the motor. 1306 is specific to the passenger side if I recall correctly.
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03-30-2013, 07:40 PM | #6116 | |
Scooby Newbie
Member#: 38605
Join Date: Jun 2003
Vehicle:2000 impreza |
Quote:
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04-01-2013, 02:57 PM | #6117 |
Scooby Specialist
Member#: 157692
Join Date: Aug 2007
Chapter/Region:
Tri-State
Location: Albany, NY
Vehicle:2004 WRX "Big Red" |
Started my conversion Friday, haven't had a lot of time to work on it but it's moving along nicely. Didn't take pictures last night but I have the rear drivetrain in and the block and transmission separated. Tranny will be going in tonight, it's all ready to go.
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04-01-2013, 03:17 PM | #6118 |
Scooby Guru
Member#: 166324
Join Date: Dec 2007
Chapter/Region:
NESIC
Location: BLOD in BLOD out
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I was missing JDM talk.
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04-01-2013, 04:24 PM | #6119 |
Scooby Specialist
Member#: 224785
Join Date: Sep 2009
Chapter/Region:
MWSOC
Location: neenah
Vehicle:2005 wrx-jdm207 i went black... |
i know im going against the grain of the thread but its my turn to ask a dumb question. can anyone help me with the following
http://forums.nasioc.com/forums/show...2#post39489432 |
04-01-2013, 04:26 PM | #6120 |
Scooby Guru
Member#: 166324
Join Date: Dec 2007
Chapter/Region:
NESIC
Location: BLOD in BLOD out
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Replied.
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04-01-2013, 04:29 PM | #6121 |
Scooby Specialist
Member#: 224785
Join Date: Sep 2009
Chapter/Region:
MWSOC
Location: neenah
Vehicle:2005 wrx-jdm207 i went black... |
well thats just ****ing awesome. a 2 min install turns into a buying/selling bull**** fiasco!
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04-01-2013, 05:00 PM | #6122 |
Scooby Guru
Member#: 166324
Join Date: Dec 2007
Chapter/Region:
NESIC
Location: BLOD in BLOD out
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Trust me, been there. It does really suck though.
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04-01-2013, 05:24 PM | #6123 |
Scooby Specialist
Member#: 307912
Join Date: Jan 2012
Chapter/Region:
South East
Location: FL
Vehicle:1997 OBS V8 Ej207 Stimikey tuned |
Whats BS is that I have to either pay 900$ for a twinscroll Dp or wait 2 weeks for a 500$ one. That is upsetting. Im this close to taking the stock jdm dp and this crappy hks usdm dp and having a shop hack something up. That approach will most likely lead to the angles being off and it wont bolt up properly but Im going to run the risk.
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04-01-2013, 05:26 PM | #6124 | |
Scooby Specialist
Member#: 157532
Join Date: Aug 2007
Chapter/Region:
MWSOC
Location: Iowa
Vehicle:2002 MY03 EJ207 E85 Dom 1.5XTR Twinscroll! |
Quote:
I ended up buying one of these and having a shop weld a 4 inch extension to bridge this jdm downpipe with my usdm catback. http://www.ebay.com/itm/2002-2007-IM...-/360448745289 Not a great vendor to work with, but the part fit good. Only problem was the o2 bung near the turbo was too close to the top bolt hole and I ended up having to use a bolt with a smaller head to clear the bung. Other than that it looks great, fit great and lines up perfect with the bracket under the car. |
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04-01-2013, 05:29 PM | #6125 | |
Scooby Specialist
Member#: 172698
Join Date: Feb 2008
Chapter/Region:
MWSOC
Location: Des Moines, IA
Vehicle:11 STi BW 8374 E85 02 v8 Spec C E85 |
Quote:
Are you talking about the Tomioka racing DP or a different one? I've been waiting 4 months to have a nice 3" bolt on solution. Two weeks doesn't seem that bad... |
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