http://perrinperformance.com/shared/images/forums/projecth6/banner_engine.jpg


THE H6 ENGINE

There are many things about this engine that are very cool. Just looking at the specs doesn't do it justice. 3.0L, 6 cylinders, DOHC, AVCS, AVLS, 250HP in stock form, aluminum block, forged steel crank, chain driven cams, and only .700" longer than an EJ20! Did I mention 3 point zero liters! Being familiar with the 4 bangers, the first thing that I was interested in seeing was how the Variable lift worked. The cams are the first strange thing you see as each valve has 3 lobes. One central lobe for the low lift and 2 outer ones for high lift, longer duration. The bucket is where the magic happens. There is an inner and outer piston that rubs on both cam lobes all time. When the solenoid allows oil pressure to shoot through the oil gallery, it locks the inner piston to the outer piston/bucket, and bam, new cam profile. I have to say this is probably the coolest part of the engine. Word is this is a co-developed technology from Porsche and Subaru, sure enough the parts are made in Germany.

Cutaway of EZ30R, aka H6
http://perrinperformance.com/shared/images/jeff_pics/h6_build/h6cutaway.jpg

After getting the engine in hand a few other things that surprised us. The manifold is plastic, which sounds scary. But like other intake manifolds on cars, this is a glass-filled Nylon, which is good to 400+degrees and will hold high pressures at these temps. Plus the way these are manufactured, they allow for very smooth, very large internal diameters. Second surprise is the ports on the head. They are huge compared to the 4 cylinder ports. I was a little worried as since each runner is feeding smaller pistons they might be smaller than the 4 cylinder ports which feed larger pistons. But we were wrong. Another thing that we really liked was the throttle body. Yes its feeding a bigger engine, but it is feeding less power, so smaller throttle body??? Nope! Even better it was bigger! 3"OD vs. the WRX 2.75".



This build was a test of the basics of the H6, so drop in pistons were the answer we were looking for. We went to Supertech products and sent them an OEM piston set to build our custom pistons. Because this was a SEMA car, Willy at Supertech, was very excited about doing the H6 build as it was nothing he had seen before. This was a huge help in getting our pistons right away and getting the ball rolling with the build.


http://perrinperformance.com/shared/images/forums/projecth6/pdxh6assembly2_ntn.jpg (http://perrinperformance.com/shared/images/forums/projecth6/pdxh6assembly2.jpg)

http://perrinperformance.com/shared/images/forums/projecth6/pdxh6frontchain2_ntn.jpg (http://perrinperformance.com/shared/images/forums/projecth6/pdxh6frontchain2.jpg)

http://perrinperformance.com/shared/images/forums/projecth6/pdxh6head_ntn.jpg (http://perrinperformance.com/shared/images/forums/projecth6/pdxh6head.jpg)

http://perrinperformance.com/shared/images/forums/projecth6/pdxh6headclose_ntn.jpg (http://perrinperformance.com/shared/images/forums/projecth6/pdxh6headclose_ntn.jpg)

http://perrinperformance.com/shared/images/dynos/2008_wrx_build/placeholder.jpg

jeff,this seems to be the engine to build if i want to minimize lag?:) will you make headers?

It is a great way to get rid of lag, but expensive. Header's are not something we plan on making at this time. They are just too expensive, and not enough people wanting them. BUt you never know!

Now for the real question..is the EZ30R a 4G63 killer?

Jeff you don't happen to have any extra exhaust flanges laying around you could sell do you. I was trying to avoid getting a set cut if I didn't have to.

Now for the real question..is the EZ30R a 4G63 killer?
Well yes, but not if you compare the Money aspect to the 4g63 :)

Jeff you don't happen to have any extra exhaust flanges laying around you could sell do you. I was trying to avoid getting a set cut if I didn't have to.
None left, try calling PDXtuning, they might.

Cool Thanks

It is a great way to get rid of lag, but expensive. Header's are not something we plan on making at this time. They are just too expensive, and not enough people wanting them. BUt you never know!

If you know your Subaru history, you MIGHT be able to adapt them to fit another, larger H-6 motor...the one that was, until 2008, the largest PRODUCTION Subaru motor installed in a car available in the United States.

They have different ports is the problem. They have the larger single port Exhaust. The older H6, the 3.6L one, might have 3 ports, i am not sure though. If Subaru would just put one of these in an STI, then we are getting somewhere!

What car did this motor come in ?

What car did this motor come in ?

tribeca if im not mistaken

is the water pump chain driven?

I was thinking this was gonna be an EG33, the SVX engine. Which is relevant to my interests.

Could you not use the new 3.6L H-6? Bigger......Not sure if it's better.

is the water pump chain driven?
It sure is! Not sure if that is bad or not, but it seems to still be working just fine!

Could you not use the new 3.6L H-6? Bigger......Not sure if it's better.
It is bigger, but not sure if it is less durable or what.

the 3.6 was belt driven so not too much better. just bigger.
the 3.0 was the better choice anyways. It fit better.

Since I'm doing some research on what kind of swap I want to do for my 98 RS, Would you recommend this engine as a straight across swap (with wiring, etc) for the 2.5? The 250 or so rated HP should be plenty to keep a smile on my face and to surprise many a challenging G8 or Bimmer owner on the highway so the plan would be to leave it as is just car to car swap (maybe CAI and larger Exhaust system per availability....realizing commercial headers are out of the question currently).

Would a swap like that be fairly straightforward and would the stock engine offer enough street challenge satisfaction to be worth the trouble as compared to the higher cost of an STi or later WRX swap?

A reliable daily driver with power-a-plenty for daily use and a few highway challengers who seem to always be intimidated by the looks (which are a bit faster than the NA 2.5 allows...WRB with gold wheels). I am thinking about a 100 HP more than the currently rated 165 should be enough to keep from being TOO embarrased on the road. Not the fastest but able to hold it's own without sinking $4 or 5K+ into a turbo swap.

Just weighing options....

Thanks for your time and opinion.

Les

Nother question... What is the ez30R based out of? I have found a few used ones out of 01-04 Legacys but they are rated in the 210 to 215 Hp range. Is the 30R a factory direct engine or is it based in a production model?

Again, thanks
Les

Nother question... What is the ez30R based out of? I have found a few used ones out of 01-04 Legacys but they are rated in the 210 to 215 Hp range. Is the 30R a factory direct engine or is it based in a production model?

Again, thanks
Les
That's the EZ30D. The EZ30R is out of the 05-07 Legacy Outback, 08Legacy 3.0R Limited and Outback, and 05-07 Tribeca. Hardest part of any work with this engine in any car is the electical.
-Gaddis

any progress on this H6 build?

Now for the real question..is the EZ30R a 4G63 killer?

I'd have to say no because ive yet to see one power a car down the strip at 198mph doing a 7.7 in the 1320 nor make 1130whp so im gonna have to say no for now.

The H6 project is long since done. :(
The customer that bought the car lives in CA and has been driving it for more than year now, had it tuned on 91 a couple of times by Surgeline Tuning, makes great power and still holding up just fine!

plz dont tell me this is the only one. cuz i want one too.

its the only we built. But there are a few around now. Mr Jeff Sponaugles car lives again as of yesterday, and Ron at Axis racing has built a few engines. So they are around!

Is this swap any cheaper than an STi swap?

It is the opposite of Cheap!! :) Give Ron at Axis a call, he can give you some basic pricing.

Jeff... what trannys will bolt up to this thing? Is it standard phase 2 EJxxx bolt pattern?

All of them! That is a great thing about the H6 stuff lots of things just bolt up.

I bet it will make a nice noise... mmmmmmm....:D

the h6's sound great...

can you say porsche

More like ferrari with an exhuast on it

I want sound clips.

2nd on the sound clips, that would be sweet!

This is the same H6 project that is mentioned in the "Subaru performance builders guide" right?

I'm curious, because the intake manifold in those pics make the H6 look as though it could support a roots/twin screw SC setup without much trouble (unless you count hood clearance). I bet it would sound pretty slick and make exhaust piping a little easier.

just a thought.

Found something for ya
http://s40.photobucket.com/albums/e234/bothersu/?action=view&current=sptintake014.flv

Thanks that was very educational. It's nice to see something original and new. It seems like Subaru's 4 cylinder engines have remained basically the same since the 80's.

thanks for the clip! that thing sounds mean.