EZ H6 Engine Build - Part Compatibility

Posts specific to the 3.0 litre NA H6 engine

EZ H6 Engine Build - Part Compatibility

Postby Cookie_187 » Sun Dec 20, 2015 7:33 pm

After some knowledge from the EZ engine gurus...



Starting with some general info:

(I'm going to refer to the Gen4+ EZ30D as an EZ30R for simplicity)

- EZ30D: 89.2mm Bores, 80mm Stroke and 10.7:1 Compression Ratio

- EZ30R: 89.2mm Bores, 80mm Stroke and 10.7:1 Compression Ratio

- EZ30D: 92mm Bores, 91mm Stroke and 10.5:1 Compression Ratio



The EZ36D uses asymmetrical rods to achieve the longer stroke

The EZ30"R" seen in Gen4s and beyond utilises CANBUS electronics, as does the EZ36D, whereas the Gen3 EZ30D H6 does not

The EZ30R has AVLS and AVCS on the intake cams and the EZ36D has AVCS on both intake and exhaust cams, the EZ30D has neither of these technologies however the EZ30D has a cast intake manifold with variable intake geometry whereas the EZ30R and EZ36D have plastic intake manifolds. The EZ30D's exhaust ports merge internal to the heads so there is one exhaust outlet from each head whereas the EZ30R and EZ36D have individual exhaust outlets from the heads

The EZ30D uses a cable throttle whereas the EZ30R and EZ36D use drive-by-wire throttles







I'm wanting to know if the following combination is possible:

- EZ36D Block (92mm Bores)

- EZ30R Crank (80mm Stroke)

- EZ36D Pistons (92mm)

- EZ30R Rods

- EZ30D Heads, Manifolds, Loom and ECU etc from a JDM B4 RS30



This equates to a 3191cc (3.19L) displacement





The points that I definitely need to confirm are:

- Will the EZ30R Crank fit and work in the EZ36D Block?

- Will the EZ36D Pistons connect to the EZ30R Rods on the EZ30R Crank or do the EZ36D Pistons connect differently with their asymmetrical Rods?

- Will the pistons protrude the block (and a quenched EZ36D head gasket) so therefore interfere with the EZ30D Heads?

- Can I bore out the combustion chambers of the EZ30D heads to avoid piston contact if so?

- Should I also port and/or polish the EZ30D heads for the slight capacity increase to approximately 3.2L?

- Will the EZ30D Heads fit and be compatible with the EZ36D Block in regards to the above and coolant & oil passages?

- Can the resultant compression ratio of the above combination be calculated accurately assuming EZ36D head gaskets (unsure of thickness) are used?

- Can EJ204 Pistons and Rods be used with the EZ30R Crank in the EZ36D Block if the above Piston/Rod-Crank combination won't work?

- Will everything behind the timing cover fit and work with an EZ36D Block and EZ30D Heads combination?

- Would the ECU from a JDM B4 RS30 (EZ30D) be happy with the 192cc capacity increase or possible slight compression ratio change if using 98RON?



All else external to the engine would be the same as the JDM B4 RS30 including mainfolds, sensors & wiring and cable throttle etc. for an easy install into a Gen1








For those readers interested in turbocharging such a build... Could they use Forged/Hyper-Eutectic EJ207 Pistons and EJ207 or EJ257 Rods for the lower compression ratio?

There should also be the possibility of using the EZ36D Dual AVCS Heads and manifolds etc with the above assuming then also going for an aftermarket ECU as well. Using them instead of the EZ30D heads would give more flexibility with exhaust fabrication for a nice equal length / twin-scroll turbo setup



I don't intend to add forced induction myself, if such builds would not be possible then for an NA H6, a complete EZ30D from a JDM B4 RS30 would suffice me





Thanks heaps
Last edited by Cookie_187 on Tue Dec 22, 2015 9:22 pm, edited 1 time in total.
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Re: EZ H6 Engine Build - Part Compatibility

Postby BillyCorgi » Sun Dec 20, 2015 9:43 pm

You need a copy of Subaru Document 011822-MSA5P0631
It covers the three variants of the H6 engine you describe.

BTW, the three litre engines use two timing chains, one for Left Bank and one for Right Bank.
the three point six litre engine uses three timing chains, one from the crank to the idler, the one from the idler to Left Bank and then one from the idler to Right Bank.

Unfortunately document 011822-MSA5P0631 does not provide cylinder spacing information nor block deck height information.
Workshop manuals covering the 3.0R H6 are readily available. However manuals covering the 3.6 are a little harder.
The 3.0 has block height 202.0mm; main bearing dia nominal 64.0mm and crank pin dia nominal 52.0mm
The 3.6 has block height 202.0mm; main bearing dia nominal 64.0mm and crank pin dia nominal 52.0mm - SAME
Piston pin diameter for both are 22.0mm

The 2.0litre block is 201mm height, however uses 92mm bore.
EJ204 Piston & Rod components would like protrude out of the top of the block by many mm if they fitted into the 3.6 H6 as you are preposing.
Protrusion roughly 201mm - 202mm + 1/2 of 80mm - 1/2 of 75mm or 1.5mm

Sounds like you should start collecting your own set of workshop manuals and doing some metrological research.
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Re: EZ H6 Engine Build - Part Compatibility

Postby Adrian2627 » Sun Dec 20, 2015 11:50 pm

Why do you want to use the older heads with the siameased exhaust port? Are you trying to keep things simple by not using the Dual AVCS of the EZ36. If that's the case why not just build an EJ33 and run one turbo per bank? Much cheaper as you can use EJ STI parts.

I don't think the RS30s ECU was able to be flashed. You'd have to go AM like Haltech. There was a Viper ECU used on an EZ build in a BG that A&M put together a few years back so that might also be an option.
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Re: EZ H6 Engine Build - Part Compatibility

Postby kiks » Tue Dec 22, 2015 8:59 pm

You realise they are joined only by EZ, and arbitrarily are not even remotely related otherwise?

For one. You wont have a functioning oilpump in any combination of 30/36. The cranks are not even remotely the same.

Are you for some reason worried about controlling an EZ36? Or an EZ30? Off the shelf Link, motec, haltech, vipec can all do so.

Smart person would follow the proven path (400RWkw for nearly 8? years now) or even go a little further; EZ30R, offset ground and destroked to 2.8L. 10k rpm is needed in a subaru 6 somewhere on earth.
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Re: EZ H6 Engine Build - Part Compatibility

Postby WIDELOAD » Wed Dec 23, 2015 7:56 am

kiks wrote:
Smart person would follow the proven path (400RWkw for nearly 8? years now) or even go a little further; EZ30R, offset ground and destroked to 2.8L. 10k rpm is needed in a subaru 6 somewhere on earth.


Well, get to it Cracka. :lol:
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