EJ20K ports VS. EJ25D, EJ251 and EJ22T ports

Heads, valves, pistons, rods, crankshaft, etc...

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PhyrraM
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EJ20K ports VS. EJ25D, EJ251 and EJ22T ports

Post by PhyrraM » Thu Aug 20, 2009 12:03 am

I figured I'd take a few snaps of the various ports I have here in the garage. I was a bit suprised to see the difference in the EJ25D and the EJ20K. There are alot of posts stating they came from the same casting. They d not, but it is close.

Also keep in mind that the difference between the "D" and the "K"looks worse than it is. This is because most of the extra size on the EJ20K is at the port floor where air is moving the slowest.

It looks like I forgot to snap a pic, but the EJ20k gasket matches the ej20k port EXACTLY. The gasket is the exact size of the port. Keep that in mind when comparing the pics.


EJ20K gasket on EJ25D head. In this case a '98 Impreza 2.5RS. The top of the port is very close to the same contour as the "K". the bottom however, is not nearly as wide.
Image

Factory "port match" on a EJ251. In this case a 2001 Impreza 2.5RS. Keep this pic in mind when looking at the following ones.
Image

Factory EJ251 gasket (which is slightly bigger than the port) on the EJ20K heads. Notice that the gasket is virtually the sam size as the "K" port, making the EJ20K ports slightly bigger than the EJ251.
Image

EJ20K gasket over an EJ22T gasket. Very large difference here, as expected.
Image


Keep in mind these port sizes are not absolute. They do not denote flow, only suggest which ones may be more suited to a given flow rate goal. The port shapes and the camshafts also play a role in total flow capacity.

If there are any other combos youi would like to see, ask. I'll try to take pics and post them up. I will do a few of EJ20G heads in the next day or so after I get them back from the machine shop.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
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kimokalihi
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Post by kimokalihi » Thu Aug 20, 2009 1:14 am

I have EJ20H heads still if you'd like a picture of those with the gaskets.

I also have the heads on that motor I'm working on which you said was EJ20G/K?
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PhyrraM
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Post by PhyrraM » Thu Aug 20, 2009 1:18 am

Sure, any and all pictures can only add to the community info pool. Throw a ruler or tape measure on it and snap a few pics of that too. I plan on adding dimensions eventually also.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack

kimokalihi
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Post by kimokalihi » Thu Aug 20, 2009 1:22 am

Alright, next time I'm over at my parents I'll get some pictures. In the meantime, I found this picture in my build thread of the heads on that Forester motor. Looks like the intake ports match the gasket perfectly all the way around!

Image
98 Metro Hatch Daily Driver :)
91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson

93forestpearl
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Post by 93forestpearl » Thu Aug 20, 2009 1:59 am

Can you compare any 205 or 257 heads with the 25d and 20K heads?



What heads would you use depending on the goal of the motor?



I feel that various head combinations would be more ideal than others depending on goals of the setup. Some think that bigger is always better, and I think there is more to it than that.
→Dan

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gijonas
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Post by gijonas » Thu Aug 20, 2009 2:03 am

What someone needs to do is bandsaw some now so we can get cross sections and see how much we can port.
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PhyrraM
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Post by PhyrraM » Thu Aug 20, 2009 2:14 am

93forestpearl wrote:Can you compare any 205 or 257 heads with the 25d and 20K heads?
Don't have any phase 2 heads other than the ones in my WRX. If I even happen to take the intake off, I'll be sure to get a few pics.
What heads would you use depending on the goal of the motor?
.......
I feel that various head combinations would be more ideal than others depending on goals of the setup. Some think that bigger is always better, and I think there is more to it than that.
Yup. I tried to express that in the original post. For my build, I think that good flowing, but still stock ports and cams (EJ20K in my case) should make for an all-around good powerband with a 2.35 liter motor w/TD05. If I can carry the powerband to 6000RPM before drastic falloff, I'll be happy.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack

93forestpearl
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Post by 93forestpearl » Thu Aug 20, 2009 3:26 am

Cool.


Honestly, my 22T heads were fun with the wad of torque early. With a quick spooling turbo they would be great for rally cross or auto cross.


I went with the 25D heads since they are cheap, flow well up top compared to the 22T heads, and can be built up if need be. I wish they had the newer sized buckets, but oh well.
→Dan

piddster34 at h0tma1l d0t c0m

BXSS
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Post by BXSS » Fri Aug 21, 2009 6:43 pm

Didn't Fuji from RS25 take like 10000 pictures odf just about every subaru head port on the planet?
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PhyrraM
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Post by PhyrraM » Fri Aug 21, 2009 8:25 pm

Yes he did.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack

RJ93SS
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Post by RJ93SS » Sat Aug 22, 2009 8:06 am

Thanks Phyrra. Good info. :D
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GodSquadMandrake
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Post by GodSquadMandrake » Sat Aug 22, 2009 9:24 am

So basically what we have learned here is that we should port the shit out of our heads?
-Doug Wilson

PhyrraM
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Post by PhyrraM » Sat Aug 22, 2009 11:54 am

GodSquadMandrake wrote:So basically what we have learned here is that we should port the shit out of our heads?
That depends on your intended usage. If you want max-flow for a big turbo and high RPM use, and you don't want to do a DOHC conversion, then yes. :P

My intention was just to add more info to the board. Nothing more, nothing less. Fuji has a great thread on RS25 and Nasioc, but these are directly related to the stuff we generally use. Phase 1 heads that will work with the EJ20G or EJ25D intake manifolds.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack

GodSquadMandrake
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Post by GodSquadMandrake » Sun Aug 23, 2009 5:44 pm

PhyrraM wrote: That depends on your intended usage. If you want max-flow for a big turbo and high RPM use, and you don't want to do a DOHC conversion, then yes. :P

My intention was just to add more info to the board. Nothing more, nothing less. Fuji has a great thread on RS25 and Nasioc, but these are directly related to the stuff we generally use. Phase 1 heads that will work with the EJ20G or EJ25D intake manifolds.
I already did the DOHC conversion so too late there but no I'm just trying to get 360 CFM of flow through my heads since thats what the FIA tells me I can get through my 34mm restrictor. It's either that or build an NA motor. At least with NA there is no restrictor and I can move up to 2.5 liters instead of just 2.2. Either way high compression and E85 is on the table.
-Doug Wilson

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Post by epicfail » Wed Aug 26, 2009 5:33 am

360CFM total. 90CFM/port doesn't sound like it should be real hard to accomplish.
[quote="RJ93SS"]u fail, epicly[/quote][quote="evolutionmovement"]Don't do drugs, kids, men may not need nipples, but we look a lot funnier without them.[/quote]

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