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