EJ20H long block with Ej20g manifold/wiring

verendia · 01-10-2008, 02:45 AM

As the title states. Im about to do this within the next month since i have to replace my clutch but i am curious how many people have done this. I read a lot of talk but no follow ups. What are the benefits if any? I have a perfect working ej20g non closed deck and i got a deal on a ej20h long block. all i have to do is swap over the manifolds(intake/exhaust) and all sensors and this should work right? will my ej20g ecu get retarted even though im running same turbo and injectors? I jsut want your 2 cents. if you think its not worth it or there in no gain please chime in.

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Marnix · 01-10-2008, 07:00 AM

No gain, no loss. Just plug the oil and coolant lines on the LH side head.

Matt Monson · 01-10-2008, 11:41 AM

People have been doing this for years as a cheap fix when their tired Ej20G gives up the ghost. It's practically an identical replacement...

Marnix · 01-11-2008, 04:24 AM

Maybe the EJ20H pistons are a little bit beefier but I don't really remember...

Matt Monson · 01-11-2008, 12:17 PM

I just thought they had a little higher dome for a touch more compression...

Marnix · 01-11-2008, 05:06 PM

Higher dome = more material = beefier

Matt Monson · 01-11-2008, 05:09 PM

Quote:

Originally Posted by Marnix

Higher dome = more material = beefier

Only if they leave more material behind the dome.

I've never had an Ej20H apart below the shortblock state so I don't know. I've seen the dome on them and compared them to the Ej20G's from above, but I haven't ever seen the backside...

Marnix · 01-11-2008, 05:18 PM

I thought the dish was a bit more shallow on an EJ20H and the pistons a bit heavier, but it's been a few years back since I last built a short block using EJ20H parts.

99WRXEJ20 · 01-12-2008, 07:11 PM

I have a blown ej20h getting torn apart here soon. Anyone have the specs on ej20g stuff so we could compare? I dont need the info but if someone wants it then...............

luka · 04-08-2013, 01:05 PM

hey guys,

I'm attempting the same conversion, I blew my ej20g and got an ej20h longblock for a hyper cheap price. I'm just about ready to put the motor in the car but was wondering if anyone can clear up what sensors need to be swapped? I've read a lot about the EJ20R Cam/Crank sensors needing to be swapped but I haven't been able to find anything specific for the EJ20H -> EJ20G swap.

some gotcha's that I came across thus far:
1) Oil/Coolant feeds/returns need to be plugged on the one side
2) Coolant (feed I think?) is on the far side of the turbo now instead of directly underneath. anyone have a solution for this? the only thing I can think of is to S a line from the one side to the other.
3) Said coolant line is touching the up-pipe. my only solution is to wrap both the up-pipe and coolant line with heat wrap.
4) metal coolant lines that run from the thermostat behind the timing cover had to be swapped
5) Engine mounts look completely different but appear as if they will fit. I have yet to test it.

If I'm missing anything, any advice/guidance would be greatly appreciated.

Thanks

eg33GC · 04-08-2013, 01:21 PM

re use the coolant stuff from your g.
nothing wiring/sensor wise has to be changed.

the h is literally a g with another turbo and intake manifold

luka · 04-08-2013, 02:49 PM

That is excellent news

Yeah the main coolant crossover is completely different and I will be using my G's.

is there any way to take the hard coolant line out of the head and swap them? they look to be pressed in... the way they are lined up now I gotta put together a serious mickey mouse hose to make the ends meet.

here's a pic of the EJ20H coolant line:

and here's the EJ20G line:

As you can see, mating the EJ20H with the stock turbo is a PITA.

eg33GC · 04-08-2013, 02:54 PM

meh, just grab some heater hose and make it work!

i_c_the_light · 04-08-2013, 03:17 PM

Quote:

Originally Posted by luka

That is excellent news

Yeah the main coolant crossover is completely different and I will be using my G's.

is there any way to take the hard coolant line out of the head and swap them? they look to be pressed in... the way they are lined up now I gotta put together a serious mickey mouse hose to make the ends meet.

here's a pic of the EJ20H coolant line:

and here's the EJ20G line:

As you can see, mating the EJ20H with the stock turbo is a PITA.

Okay. That last pic has incorrectly labeled the oil return line as a coolant line.

You can get that off no problem and replace it with the G line. Just be careful getting the G one out of the head.

luka · 04-08-2013, 03:19 PM

That's my plan of record. I'm just anxious about having that coolant line pressed against the up-pipe.. I'll bend it a bit and wrap everything up.

Thanks for the help I'm feeling 139873298479324732 times better about this swap.

luka · 04-08-2013, 03:23 PM

Quote:

Originally Posted by i_c_the_light

Okay. That last pic has incorrectly labeled the oil return line as a coolant line.

You can get that off no problem and replace it with the G line. Just be careful getting the G one out of the head.

How do I get the line out? pry it out with a flat head? I've never dealt with lines like this before... I don't wanna start prying at it and break something :/

i_c_the_light · 04-08-2013, 03:31 PM

Quote:

Originally Posted by luka

How do I get the line out? pry it out with a flat head? I've never dealt with lines like this before... I don't wanna start prying at it and break something :/

It's a pain. Get it a wee way out with a driver and then wiggle it while pulling outwards. Be careful that metal is soft.

luka · 04-08-2013, 04:27 PM

gahhh.... and there's no issues with tapping it back in and having it seal? I would hate to go through all that trouble and it doesn't seal...

Edit: would a propane torch help at all with taking it out?

Marnix · 04-09-2013, 09:13 AM

No unless you want to fry the head.

luka · 04-09-2013, 02:14 PM

duly noted.

I opted to take the hard line off the turbo but because I have the TD05h the line is sitting much lower 'cause of the larger cartridge so the bend is extremely tight. gonna swing by the local auto chop and see if I can go through all their hoses to find something that will work.

01-10-2008, 02:45 AM	#1
verendia Scooby Specialist Member#: 54550 Join Date: Feb 2004 Chapter/Region: Tri-State Vehicle: 1995 LX graphite grey	EJ20H long block with Ej20g manifold/wiring As the title states. Im about to do this within the next month since i have to replace my clutch but i am curious how many people have done this. I read a lot of talk but no follow ups. What are the benefits if any? I have a perfect working ej20g non closed deck and i got a deal on a ej20h long block. all i have to do is swap over the manifolds(intake/exhaust) and all sensors and this should work right? will my ej20g ecu get retarted even though im running same turbo and injectors? I jsut want your 2 cents. if you think its not worth it or there in no gain please chime in. * Registered users of the site do not see these ads.

04-08-2013, 04:27 PM	#18
luka Scooby Newbie Member#: 194742 Join Date: Nov 2008 Chapter/Region: E. Canada Location: Waterloo Vehicle: 1993 Impreza WRX JDM Silver	gahhh.... and there's no issues with tapping it back in and having it seal? I would hate to go through all that trouble and it doesn't seal... Edit: would a propane torch help at all with taking it out? Last edited by luka; 04-08-2013 at 04:45 PM.

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01-10-2008, 07:00 AM	#2
Marnix Scooby Specialist Member#: 51480 Join Date: Dec 2003 Chapter/Region: International Location: The Netherlands Vehicle: 1984 AM5, 1984 AF1, 1994 BC4, 2015 Outback	No gain, no loss. Just plug the oil and coolant lines on the LH side head.

01-10-2008, 11:41 AM	#3
Matt Monson Scooby Guru Member#: 832 Join Date: Jan 2000 Chapter/Region: RMIC Location: Teh Ghetto Garage, CO Vehicle: 99 2.5RS, '85 911 '73 914 and 2012 BRZ	People have been doing this for years as a cheap fix when their tired Ej20G gives up the ghost. It's practically an identical replacement...

01-11-2008, 04:24 AM	#4
Marnix Scooby Specialist Member#: 51480 Join Date: Dec 2003 Chapter/Region: International Location: The Netherlands Vehicle: 1984 AM5, 1984 AF1, 1994 BC4, 2015 Outback	Maybe the EJ20H pistons are a little bit beefier but I don't really remember...

01-11-2008, 12:17 PM	#5
Matt Monson Scooby Guru Member#: 832 Join Date: Jan 2000 Chapter/Region: RMIC Location: Teh Ghetto Garage, CO Vehicle: 99 2.5RS, '85 911 '73 914 and 2012 BRZ	I just thought they had a little higher dome for a touch more compression...

01-11-2008, 05:06 PM	#6
Marnix Scooby Specialist Member#: 51480 Join Date: Dec 2003 Chapter/Region: International Location: The Netherlands Vehicle: 1984 AM5, 1984 AF1, 1994 BC4, 2015 Outback	Higher dome = more material = beefier

01-11-2008, 05:18 PM	#8
Marnix Scooby Specialist Member#: 51480 Join Date: Dec 2003 Chapter/Region: International Location: The Netherlands Vehicle: 1984 AM5, 1984 AF1, 1994 BC4, 2015 Outback	I thought the dish was a bit more shallow on an EJ20H and the pistons a bit heavier, but it's been a few years back since I last built a short block using EJ20H parts.

01-12-2008, 07:11 PM	#9
99WRXEJ20 Scooby Specialist Member#: 34545 Join Date: Mar 2003 Chapter/Region: MWSOC Location: Worthington, Ohio Vehicle: 1999 GC8 74f	I have a blown ej20h getting torn apart here soon. Anyone have the specs on ej20g stuff so we could compare? I dont need the info but if someone wants it then...............

04-08-2013, 01:05 PM	#10
luka Scooby Newbie Member#: 194742 Join Date: Nov 2008 Chapter/Region: E. Canada Location: Waterloo Vehicle: 1993 Impreza WRX JDM Silver	hey guys, I'm attempting the same conversion, I blew my ej20g and got an ej20h longblock for a hyper cheap price. I'm just about ready to put the motor in the car but was wondering if anyone can clear up what sensors need to be swapped? I've read a lot about the EJ20R Cam/Crank sensors needing to be swapped but I haven't been able to find anything specific for the EJ20H -> EJ20G swap. some gotcha's that I came across thus far: 1) Oil/Coolant feeds/returns need to be plugged on the one side 2) Coolant (feed I think?) is on the far side of the turbo now instead of directly underneath. anyone have a solution for this? the only thing I can think of is to S a line from the one side to the other. 3) Said coolant line is touching the up-pipe. my only solution is to wrap both the up-pipe and coolant line with heat wrap. 4) metal coolant lines that run from the thermostat behind the timing cover had to be swapped 5) Engine mounts look completely different but appear as if they will fit. I have yet to test it. If I'm missing anything, any advice/guidance would be greatly appreciated. Thanks

04-08-2013, 01:21 PM	#11
eg33GC Scooby Specialist Member#: 206851 Join Date: Mar 2009 Chapter/Region: MWSOC Vehicle: 56 Belair Pro Street	re use the coolant stuff from your g. nothing wiring/sensor wise has to be changed. the h is literally a g with another turbo and intake manifold

04-08-2013, 02:49 PM	#12
luka Scooby Newbie Member#: 194742 Join Date: Nov 2008 Chapter/Region: E. Canada Location: Waterloo Vehicle: 1993 Impreza WRX JDM Silver	That is excellent news Yeah the main coolant crossover is completely different and I will be using my G's. is there any way to take the hard coolant line out of the head and swap them? they look to be pressed in... the way they are lined up now I gotta put together a serious mickey mouse hose to make the ends meet. here's a pic of the EJ20H coolant line: and here's the EJ20G line: As you can see, mating the EJ20H with the stock turbo is a PITA.

04-08-2013, 02:54 PM	#13
eg33GC Scooby Specialist Member#: 206851 Join Date: Mar 2009 Chapter/Region: MWSOC Vehicle: 56 Belair Pro Street	meh, just grab some heater hose and make it work!

04-08-2013, 03:19 PM	#15
luka Scooby Newbie Member#: 194742 Join Date: Nov 2008 Chapter/Region: E. Canada Location: Waterloo Vehicle: 1993 Impreza WRX JDM Silver	That's my plan of record. I'm just anxious about having that coolant line pressed against the up-pipe.. I'll bend it a bit and wrap everything up. Thanks for the help I'm feeling 139873298479324732 times better about this swap.

04-09-2013, 09:13 AM	#19
Marnix Scooby Specialist Member#: 51480 Join Date: Dec 2003 Chapter/Region: International Location: The Netherlands Vehicle: 1984 AM5, 1984 AF1, 1994 BC4, 2015 Outback	No unless you want to fry the head.

04-09-2013, 02:14 PM	#20
luka Scooby Newbie Member#: 194742 Join Date: Nov 2008 Chapter/Region: E. Canada Location: Waterloo Vehicle: 1993 Impreza WRX JDM Silver	duly noted. I opted to take the hard line off the turbo but because I have the TD05h the line is sitting much lower 'cause of the larger cartridge so the bend is extremely tight. gonna swing by the local auto chop and see if I can go through all their hoses to find something that will work.