enthuzed wrote:The valves will still clear on the 64 head as the chambers are that much deeper...even after taking 1mm off it... They are a different shape too and bear in mind when comparing Starion 63 heads with L300 63 heads, the L300 has a smaller combustion chamber to the Staz one.
For more information, I built my engine using the L300 64 head with Galant VR4 pistons, and the crown was 12cc from memory instead of 14cc for standard Starion pistons (I had the high comp pistons originally in the Jap/NZ GSRIII one, also around 12cc).
If you built your engine like that... you will end up with 6.7:1 Compression Ratio....
Hmmmm, my measurements of my 4g63 head give a combustion chamber volume of around 57cc, which is a bit too big really. I measured a DASH head this evening, came out at about 42cc... Dash head would make things much easier in many respects already havging more intake valve area, and larger exhaust valves.... Just those rocker covers are so fricken ugly! Plus, I;d need different pistons again. Forged ones from the states are pretty cheap though...
Nonono, naughty thoughts, just slap it together and get it running already!
The graduations on my measuring device are worn off though, so I did it by weight using the mrs' super fancy baking scales... better clean them up good and not leave them in the garage ;-).
Bah, factory ECU is shit anyway, if I do use it, it'll be MPI, probably still on the EVO ecu, with a little controller to turn on the extra valves when needed. Luckily the intake flange is really simple, so I can can CAD it up and get one laser cut pretty easily.
The manifold design is a bit puzzling however, as the two ports are completely separate, and I think the injector would have to be a little further up the runner than is ideal to make sure it's in an area of consistent airflow... But fuck it, I'll bash something together with a hammer and run with it. I can always blend the ports slightly, and continue that blending into the 10mm manifold flange...
enthuzed wrote:The valves will still clear on the 64 head as the chambers are that much deeper...even after taking 1mm off it... They are a different shape too and bear in mind when comparing Starion 63 heads with L300 63 heads, the L300 has a smaller combustion chamber to the Staz one.
For more information, I built my engine using the L300 64 head with Galant VR4 pistons, and the crown was 12cc from memory instead of 14cc for standard Starion pistons (I had the high comp pistons originally in the Jap/NZ GSRIII one, also around 12cc).
If you built your engine like that... you will end up with 6.7:1 Compression Ratio....
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