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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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04-11-2012, 02:12 AM | #757 |
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04-11-2012, 02:24 AM | #758 | |
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Supposedly this is where the D-4S system really shines. The idea behind using 2 injectors per cylinder is to create excellent fuel dispersion without the requirement of intake porting that promotes charge motion. That being said, the intake porting should be shunted towards high flow, as opposed to high tumble. I was really sad when we found out the FA20 was not going to have any sort of variable lift control for the cams, but the D-4S system is definitely a gem in and of itself and it makes me excited all over again. Even so, imagine how amazing this engine would be with VVTL-i tacked on in addition to everything else... |
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04-11-2012, 12:25 PM | #759 | |
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I haven't seen much published stuff on squish zones in GDI engines. Maybe there isn't a whole of squish flow, or maybe it's not that important compared to the tumble and swirl flows. |
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04-11-2012, 02:48 PM | #760 |
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04-11-2012, 03:05 PM | #761 |
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With the DI systems and charge motion, we are basically also less dependent on intake velocity because we are adding kinetic energy from the high pressure pump too, correct?
What are some of the pressures and velocities of DI fuel spray?
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04-11-2012, 06:23 PM | #762 | |
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Well as far as squish zones go, below are squish zones on some well-known port injected engines from tdifferent angles. Here's the taper squish zones on a 1ZZ engine:
Here are squish zones on a 2JZ: Here are squish zones on a Subaru EJ255 boxer engine: and here is the squish zone (which is very knock prone) on a wankel rotary engine: If you have a different combustion chamber shape (wedge for example, on a GM pushrod V8) then the squish flows will be different. I don't know too many specific details about squish flows on GDI engines. Quote:
The spray does induce additional kinetic energy into the system. Expensive computer models and optical engines (transparent single-cylinder with high speed photography) are used to study these effects. Maybe I've posted something like this before, but here are some visualizations of spray patterns based on fuel pressure and start of injection timing on a prototype flex fuel Ecoboost engine. |
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04-12-2012, 02:18 PM | #763 | |
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I still have the larger issue of what's the point of doing the internals for more RPM and air if I can't add fuel, adjust timing, raise redline, etc...still pushing those aspects with certain manufacturers in what free time I don't have Race season is upon us, so keeping up with 3MI Racing stuff, new parts development and racecar stuff with Turn In Concepts, I don't sleep. I also don't have time for my own cars. See my reduced frequency in posting on here. I still can't wait to get hands on the engine though. The FA20 has the front burner reserved. I also just realized they started doing Vendor accounts. Time for me to switch to my 3MI Racing account and see about switching over to vendor status. |
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