FYI: EJ22T w/ DOHC and Wiseco
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FYI: EJ22T w/ DOHC and Wiseco
I finished building the engine and should have it running by the end of the week. I thought I would share some findings.
This may be common knowlwdge but....
The Wiseco pistons K601M975(Stock Replacement .020 over) have a 20cc dish,(7-8cc less than stock) making them perfect for the Phase I DOHC swap. With the Wiseco's and the DOHC it should be around 8.0 to 1 comp.
This is with the stock EJ22t head gasket.
Wiseco(and almost everyone else I talked to) does not recomend running less than .030in piston to head clearance. With the EJ22t head gasket you have about .042in clearance. With the "thin" EJ22 headgasket, you are left with about .015in clearance. Thats about half what Wiseco recomends.
This may be common knowlwdge but....
The Wiseco pistons K601M975(Stock Replacement .020 over) have a 20cc dish,(7-8cc less than stock) making them perfect for the Phase I DOHC swap. With the Wiseco's and the DOHC it should be around 8.0 to 1 comp.
This is with the stock EJ22t head gasket.
Wiseco(and almost everyone else I talked to) does not recomend running less than .030in piston to head clearance. With the EJ22t head gasket you have about .042in clearance. With the "thin" EJ22 headgasket, you are left with about .015in clearance. Thats about half what Wiseco recomends.
1997 White BG Ltd 5MT, EJ22T with Wiescos, EJ20R Heads, Two large dents R.I.P
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
I ran .003 side clearance, since Im not running "high" boost. If you are going to be running higher HP levels you should run larger clearances.
The stock EJ22t HG is about .054in. So that Cometic should be fine.
The stock EJ22t HG is about .054in. So that Cometic should be fine.
1997 White BG Ltd 5MT, EJ22T with Wiescos, EJ20R Heads, Two large dents R.I.P
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
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I used a local guy that I like alot. We talked alot about tolerances, bore finish, ect... And I was able to hang around when he bored the block. Which was nice, because I was able to see the final measurements, and they were right on. It cost me $20 a cylinder to have it bored.
Whoever you use, talk to them ALOT, before you decide to use them. Be sure they are willing to work with you.
Whoever you use, talk to them ALOT, before you decide to use them. Be sure they are willing to work with you.
1997 White BG Ltd 5MT, EJ22T with Wiescos, EJ20R Heads, Two large dents R.I.P
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
what are you looking for for boost and power? i am trying to figure out my cleances and such as well as what pistons to use. what did yours cost if you dont mind me asking?
2011 Mini Countryman S All4
1970 Honda Ct90
2001 Forester S of Doom - mowed down by a Cummins
1994/5/6/01/02/03/04/06/07/08 Impregacy OUtback SS STi Type R money pit- NEW RALLYCAR!!
1970 Honda Ct90
2001 Forester S of Doom - mowed down by a Cummins
1994/5/6/01/02/03/04/06/07/08 Impregacy OUtback SS STi Type R money pit- NEW RALLYCAR!!
I will be running about 15psi and 18psi max. Im guessing around 250-275CHP.
The pistons cost me 455 shipped. Not bad considering they come with rings, pins, and clips.
I think http://www.importperformanceparts.net/ is about the cheapest.
The pistons cost me 455 shipped. Not bad considering they come with rings, pins, and clips.
I think http://www.importperformanceparts.net/ is about the cheapest.
1997 White BG Ltd 5MT, EJ22T with Wiescos, EJ20R Heads, Two large dents R.I.P
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
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Nice to see this coming together. You are way ahead of me and my Ej22T build. But then I don't even have my SC installed yet...
1974 Porsche 914 Cam Am Limted Edition AKA the Bumble Bee
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1968 Porsche 911t survivor 47k original miles
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1999 2.5RS w/ 50+ extra whp
Suby Hai!
1973 Porsche 914 2.0 l -Suby swap pending
1968 Porsche 911t survivor 47k original miles
2000 2.5RS daily driver.
1999 2.5RS w/ 50+ extra whp
Suby Hai!
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Re: FYI: EJ22T w/ DOHC and Wiseco
napphappy wrote: The Wiseco pistons K601M975(Stock Replacement .020 over) have a 20cc dish,(7-8cc less than stock) making them perfect for the Phase I DOHC swap. With the Wiseco's and the DOHC it should be around 8.0 to 1 comp.
This is with the stock EJ22t head gasket.
Sweet. I didn't realise the Wisecos had less dish. Now I'll more apt to get the phase I DOHC heads. You just made my day
→Dan
piddster34 at h0tma1l d0t c0m
piddster34 at h0tma1l d0t c0m
^Cool
UPDATE: Now Running
More Observations: At .003in piston clearance there is some slight piston slap(knocking noise) at start up. This was worriesome at first, becuase it sounds alot like a very slight rod knock. But the sound goes away in a few minutes, after the pistons warm up a bit.
UPDATE: Now Running
More Observations: At .003in piston clearance there is some slight piston slap(knocking noise) at start up. This was worriesome at first, becuase it sounds alot like a very slight rod knock. But the sound goes away in a few minutes, after the pistons warm up a bit.
1997 White BG Ltd 5MT, EJ22T with Wiescos, EJ20R Heads, Two large dents R.I.P
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
1995 Impreza EJ22T DOHC Hydra EMS, 20g, EWG, 3in APS TBE, AWIC
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- Fifth Gear
- Posts: 3043
- Joined: Tue Jan 25, 2005 9:14 pm
- Location: Twin Cities, MN
Love to ride along with you and hear and get a feel for his mod at the upcoming Subaru meet/show. You going to be there with this project?
93SS 5MT White, TD05-16G, TMIC, 3"Turboback, Magnaflow, Alu Rad, H&R Sports, AGX struts, F/R STBs, Whiteline Sways, ALK+Endlinks, Odyssey 925, AC delete, Evo8 Recaros, Sparco 4p, 3.9 LSD, Hellas+air horns, IPD short throw, 99RSrims, s03's