Toyota Develops Next-generation Engine Valve Mechanism
06-12-07 | 09:59 PM
#18
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I'll admit that I'm somewhat nieve when it comes to direct injection. I mean, I know the basics on how it works. But what is different about the Toyota system that makes it the most advanced on the market?
06-12-07 | 11:06 PM
#19
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06-13-07 | 04:56 PM
#21
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You guys missed it. There's no throttle body either. NO ONE has done that yet. Don't want the motor to breath? Well close the valves. This is far more precise than using one single drive-by-wire throttle body. Its even better than individual throttle bodies. I suspect, we're going to see some big power come out of the Toyota camp 
I'm betting this might be in the LFA engine too (and was created in-part during the R&D phase for that particular motor)
I'm betting this might be in the LFA engine too (and was created in-part during the R&D phase for that particular motor)
5-10% better mpg means +3 MPG, which is pretty big advance, plus 10% hp means another 15hp for 2.0 engine.
So I think both are pretty big.
ZR engine series got 5% better consumption just from block design (than ZZ engines), so combine these things are it starts to add up.
06-13-07 | 06:49 PM
#22
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So finally Toyota makes an official announcement regarding Valvematic. Rumour has it that the USDM Corolla or next-gen Matrix could possibly get this 2.0L Valvematic engine.
Interesting point. Although Toyota hasn't given details, it looks like there is no throttle body at all. With BMW's Valvetronic, the throttle body is still there, and remains in a fully open position while Valvetronic is operational. It's also there as a backup. Not just that, but Valvetronic uses additional rocker arms to make it work. From Toyota's illustration, it doesn't seem as though there are any additional rocker arms.
Overall the Toyota system seems to be a more compact, less clunky, and overall superior design to Valvetronic. I'm also not 100% on this, but I believe with Nissan's VVEL there is no throttle body either. Not sure about Honda's A-VTEC though. Ironic that Honda who generally are leaders when it comes to variable valve timing are now behind. Nissan's VVEL comes out on the G37 very soon, and Toyota's Valvematic also comes out in a few months. Honda's A-VTEC won't go into production until 2009, seemingly a long way off.
Power-wise, you can bet we will see some surprises. The 2.0L is supposed to be tuned for economy and efficiency, and yet it's rumoured to have 156HP and 145 lb-ft. Imagine Valvematic being added to the 2GR-FSE.
True, but the LF-A engine we've seen is part of the concept, and by no means is that engine 100% what is going to go into production.
Valvematic being integrated into the 2UR-GSE is a definite possibility. BMW's Valvetronic isn't used in their high RPM engines because it has problems working correctly above 6000 RPM. If Toyota's Valvematic can operate at high RPMs, it will be a big competitive advantage.
Toyota's D4-S direct injection system is the only one on the market that combines the usual port fuel injection with direct injection. In other words, each cylinder has two injectors (port and direct). With the IS350, that means it has 12 fuel injectors, while the LS460 has a total of 16 fuel injectors.
Also an important quote nobody mentioned:
Toyota mentioned this before, but now the point is solidified once again. One thing is for sure, Toyota is not giving the competition much breathing room here.
Originally Posted by Bean
You guys missed it. There's no throttle body either. NO ONE has done that yet. Don't want the motor to breath? Well close the valves. This is far more precise than using one single drive-by-wire throttle body. Its even better than individual throttle bodies. I suspect, we're going to see some big power come out of the Toyota camp
Overall the Toyota system seems to be a more compact, less clunky, and overall superior design to Valvetronic. I'm also not 100% on this, but I believe with Nissan's VVEL there is no throttle body either. Not sure about Honda's A-VTEC though. Ironic that Honda who generally are leaders when it comes to variable valve timing are now behind. Nissan's VVEL comes out on the G37 very soon, and Toyota's Valvematic also comes out in a few months. Honda's A-VTEC won't go into production until 2009, seemingly a long way off.
Power-wise, you can bet we will see some surprises. The 2.0L is supposed to be tuned for economy and efficiency, and yet it's rumoured to have 156HP and 145 lb-ft. Imagine Valvematic being added to the 2GR-FSE.
Originally Posted by MR F1
As for if the LF-A engine uses this, maybe not. Now that you brought it to my attention that it does not use throttle bodies, I rmember seeing a pic of the LF-A engine and it has 10 individual throttle bodies.
Maybe Yahmaha will integate it into the 2UR-GSE ?
Maybe Yahmaha will integate it into the 2UR-GSE ?
Valvematic being integrated into the 2UR-GSE is a definite possibility. BMW's Valvetronic isn't used in their high RPM engines because it has problems working correctly above 6000 RPM. If Toyota's Valvematic can operate at high RPMs, it will be a big competitive advantage.
Originally Posted by ff
I'll admit that I'm somewhat nieve when it comes to direct injection. I mean, I know the basics on how it works. But what is different about the Toyota system that makes it the most advanced on the market?
Also an important quote nobody mentioned:
Originally Posted by Toyota
As a part of its efforts to reduce CO2 emissions through high fuel efficiency and to achieve cleaner exhaust emissions, TMC plans to completely revamp its gasoline engine and transmission lineup by 2010.
06-13-07 | 08:19 PM
#24
we'll see how the advancement in technology and direct injection goes. I'm still not sure of the durability of it and since those piezo injectors are not cheap, wonder how it'll be for maintenance in the long run.
06-13-07 | 10:30 PM
#25
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Toyota's D4-S is impressive. I test drove a IS350 and really impressed me. But I think Mazda's DISI turbo is pretty impressive too by taking advantage of the lower temperature of direct injection and slapping on a turbo.
we'll see how the advancement in technology and direct injection goes. I'm still not sure of the durability of it and since those piezo injectors are not cheap, wonder how it'll be for maintenance in the long run.
we'll see how the advancement in technology and direct injection goes. I'm still not sure of the durability of it and since those piezo injectors are not cheap, wonder how it'll be for maintenance in the long run.
06-14-07 | 08:32 AM
#29
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The Advanced VTEC (AVTEC) system allows optimum control over intake valve lift and phase in response to driving conditions for a significant increase in torque across the engine rev range. Under low and medium loads, the valves are set to have low lift and early closure - this reduces pumping losses and subsequently improves fuel economy.
The new AVTEC system will allow for a 13% improvement in fuel economy over the current i-VTEC range of engines.
The new AVTEC system will allow for a 13% improvement in fuel economy over the current i-VTEC range of engines.
06-14-07 | 10:47 AM
#30
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