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Old 02-03-2005, 08:51 PM   #1
snowman4us
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Member#: 21764
Join Date: Jul 2002
Chapter/Region: RMIC
Location: Salty Lake
Vehicle:
Some GDM V8,
JDM Flat 4 X2

Default EJ20G short block in a WRX

Well, I am currently doing this swap and I found some interesting info that I think allot of people could benefit from.

This swap is possible and will greatly improve the strength of your engine without having to spend allot of money on a EJ257/EJ207 bottom end .if u are considering doing this swap I HIGHLY recommend getting the EJ20G head gaskets (I heard rumors that the EJ22T head gaskets are the same, but I cant confirm this info.) the difference in piston height during TDC in the EJ20G and the EJ205 (usdm) is .025 inches.

The gasket (ej20g) volume is .84087 cubic inches (13.79 cc's) "this was measured uncrushed so it will actually be a little lower when in the engine"
Combustion chamber volume is 47cc
Piston volume is 11cc's (this is howmutch fluid will fit in the top of the piston cutout w/o anything else)
The gasket thickness (EJ20G) is .0817 inches "also uncrushed"

So with that info u get 30.361977 cub. Inches of displacement in each cylinder.

The volume of the Combustion chamber with the gasket "uncrushed" and the piston volume is, 4.381 cub. inc (71.8484 cc's).

So the final result is, the compression ration is 8.0:1(purely mathematical), but after the compression of the gasket it will actually be around 8.1-8.2:1.



All of these measurements where taken my myself using a 6cc syringe and ATF. All the info was calculated using a program designed by my college instructor and myself, that followed the same formulas everyone else uses.
If u spot a mistake you are more then welcome to correct me, however would u specify where you got your info.


I am hoping this shine a light on a swap that I couldn’t find any previous information on.
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Old 02-03-2005, 10:24 PM   #2
Scoobie Steve
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Location: Bangor, PA
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1998 11.87@112mph
Subaru L Ver 6 STi Type R

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Great info. So the pistons on a G block clear the deck by .025"? Please explain to me how the EJ20g is stronger....if you say because its closed deck I might scream!
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Old 02-03-2005, 11:07 PM   #3
bugman1964
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01 gm6 rs brp
SXS performance

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i think he means strong as in power.with the pistons clearing the deck is should increase compresion meaning more power.. if thats what hes gettign at.

Where as my self and fellow nabisco member matt monson are going to do a ej20g with ej22t head were figuring it will give us a compression ratio some where in the neighborhood of 9:1 to 9.5:1
thus providing significant power gains using a vf11 @8psi were hoping for 200 horsepower at the fly. Ill have my car dynoed hopefully by the end of february and ill let yall know
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Old 02-03-2005, 11:22 PM   #4
snowman4us
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JDM Flat 4 X2

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the piston on the ej20G comes out of the block aprox. .010 inch. but on the EJ205 its .015 below the deck...
and by stronger, yes it has a closed deck.
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Old 02-04-2005, 12:26 PM   #5
Matt Monson
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Thanks for doing this work. I have too lazy to do any math. I will do now use your numbers to find our actual CR for bugman's car...
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Old 02-04-2005, 02:18 PM   #6
snowman4us
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JDM Flat 4 X2

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just keep in mind that the gasket info is a little high, sense it wasnt compressed.
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Old 02-04-2005, 03:24 PM   #7
subachad
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Matt,

When you figure out Bugmans CR, can you post it please. I think my heads might be hosed. If so, I'm replacing them with EJ22T heads. I'm also thinking I should do it anyway so I can return the oil directly to the head.

Chad
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Old 02-04-2005, 04:00 PM   #8
snowman4us
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JDM Flat 4 X2

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if anyone is intrested, i have some EJ20G heads for sale...
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Old 02-04-2005, 04:40 PM   #9
Matt Monson
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Quote:
Originally Posted by snowman4us
if anyone is intrested, i have some EJ20G heads for sale...
Me too...
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Old 02-16-2005, 02:39 AM   #10
spulinup
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1998 Doom Wagon
swapped GF8 with jdm ish

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Monster bump for the snowman...your threads keep helping me out. I just picked up a jdm wrx front clip (I don't know what year but it looks like an rs i.e big fog lights) with an ej20gdw4he to slap into either my wrx or a 94 impreza. I have spent like ten hours doing research and I keep bumping into your helpful threads. Keep up the good work!
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Old 02-16-2005, 02:31 PM   #11
jamesfacts
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black & blue from parking

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Quote:
Originally Posted by spulinup
Monster bump for the snowman...your threads keep helping me out. I just picked up a jdm wrx front clip (I don't know what year but it looks like an rs i.e big fog lights) with an ej20gdw4he to slap into either my wrx or a 94 impreza. I have spent like ten hours doing research and I keep bumping into your helpful threads. Keep up the good work!
Where from, if you don't mind me asking?
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Old 03-04-2005, 08:47 PM   #12
snowman4us
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Join Date: Jul 2002
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Location: Salty Lake
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Some GDM V8,
JDM Flat 4 X2

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a little update on the car...
when we started it up the car was knocking for some reason, when it got up to temp the knock went away(kinda weird). Did this 2 cold starts in a row. I belive what happend is sense it was knocking on the driver side intake cam is that it was the last one to get oil, and that was causing the knock.
the engine has now been in the car for 2weeks. and running like a charm. Had a chance to do some miner road tuning and it feels the same as the previous shortblock(witch is good, sense its the same CR).
well we put it up against an STi and was a pritty close race...

hope everyone has the same luck w/ this kind of swap as i did.

now all we are waiting for is a bigger turbo(vf23 is at its limit), FMIC, and more boost
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Old 03-04-2005, 08:49 PM   #13
snowman4us
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Join Date: Jul 2002
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Location: Salty Lake
Vehicle:
Some GDM V8,
JDM Flat 4 X2

Default

also if anyone is intrested in getting an EJ20G swap i can get them.
they will include

EJ20G(complete engine)
Wiring harness
ECU
JDM WRX tranny
TD05 turbo.

if intrested just shoot me a PM

kirill
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