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Mr. Apollo posted:The Chevy system sounds like the Nissan/Infiniti VVEL system which continuously varies lift and timing on the intake and exhaust valves. VVEL seems to be fairly variable with the degree of lift change. Throatwarbler posted:This is a system that varies valve lift, like VTEC. This mechanism is unique as far as I can tell, the closest comparable system, and they're not really the same either, would be the Toyota's VVTL-i that they only used on one engine and no longer make. This system seems to be 2 mode, with the novelty being a roller bearing to reduce friction when in high lift mode. Compared to VTEC and VVTL that use a mechanical pin acutated by oil. For stuff like this, it's moderately fun to see the wheel get reinvented. But where are my drat camless valves already?
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Sep 18, 2012 19:58
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kimbo305 posted:VVEL seems to be fairly variable with the degree of lift change. When automakers stop fighting and agree on a new standard for higher voltage electrical systems.
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Sep 18, 2012 20:02
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Xguard86 posted:I did watch a guy try and fail to back a murcielago into a spot at starbucks for 5 minutes. It was like catching a super model on the shitter.
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Sep 18, 2012 20:56
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awesome-express posted:And here's the McLaren F1 successor:  ?As for people parking exotics, I've seen a few locals parking their Ferraris and Astons without issue, but those are a bit more conventional than Lambos. It's still sad either way.
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Sep 18, 2012 21:09
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I will take my cam how God intended, under the heads, not over! I still have to recover the cost of my adjustable pushrod!
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Sep 18, 2012 21:23
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ferrari and aston martin don't seem to build their cars as wide as lambo. Those things take up the horizontal space of an SUV with a probably worse turn radius and no curb hopping.
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Sep 18, 2012 21:31
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MrChips posted:When automakers stop fighting and agree on a new standard for higher voltage electrical systems. Are there actuators up to the task of opening and closing valves several hundred times per minute for hours at time over the course of 10-15 years without failure? I figured that would be the biggest stumbling block.
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Sep 18, 2012 21:35
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rscott posted:Are there actuators up to the task of opening and closing valves several hundred times per minute for hours at time over the course of 10-15 years without failure? I figured that would be the biggest stumbling block. I don't know of a powertrain warranty that runs 15 years. 
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Sep 18, 2012 21:39
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awesome-express posted:And here's the McLaren F1 successor: The front end looks really squished in that photo, but the rear end is incredible.
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Sep 18, 2012 21:51
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rscott posted:Are there actuators up to the task of opening and closing valves several hundred times per minute for hours at time over the course of 10-15 years without failure? I figured that would be the biggest stumbling block. I think Fiat has an electro-hydraulic system now. Still uses cams, though, but the cam actuates a hydraulic piston connected to the intake valves. And who was it that was working on a pneumatically actuated valvetrain?
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Sep 18, 2012 23:14
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https://www.youtube.com/watch?v=Td9Gz_h7Qpg Multiair is a cool piece of technology, and right now they're working on integrating it with the Pentastar and Hemi (I'm assuming) engines. Hopefully it won't be a liability as the cars equipped with it age.
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Sep 19, 2012 01:24
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edit: ^^ That was really cool.rscott posted:Are there actuators up to the task of opening and closing valves several hundred times per minute for hours at time over the course of 10-15 years without failure? I figured that would be the biggest stumbling block. Technically, it just has to open, right? Or do electric systems do away with valve springs too? oRenj9 fucked around with this message at 01:34 on Sep 19, 2012 |
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Sep 19, 2012 01:26
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Why are poppet valves always round and not elliptical or asymmetric or an array of smaller valves that would give proportionately more flow area?
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Sep 19, 2012 02:11
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Tekne posted:https://www.youtube.com/watch?v=Td9Gz_h7Qpg Multiair with the free-flowing Hemi heads would be ridiculous.
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Sep 19, 2012 02:14
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grover posted:Why are poppet valves always round and not elliptical or asymmetric or an array of smaller valves that would give proportionately more flow area? Maybe something to do with the seal and/or rotation of the valve?
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Sep 19, 2012 02:46
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I gotta chime in and say that MultiAir is amazing. I've been rocking around in my parents 500 twinair and it definitely doesn't feel like a 2 cylinder car. plus the noises it makes are amazing. grrrrrr bub bub bub grrrrrr!
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Sep 19, 2012 02:50
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VikingSkull posted:Multiair with the free-flowing Hemi heads would be ridiculous. I think we can expect to see some awesome products from Fiatsler in the coming years. An Italian poster on Allpar shared this interesting tidbit: quote:I think we have been talking so much about this that somehow we lost sight of the meaning of the original news.
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Sep 19, 2012 03:20
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MrChips posted:When automakers stop fighting and agree on a new standard for higher voltage electrical systems. Something that hopefully electric cars will really help with.
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Sep 19, 2012 03:36
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grover posted:Why are poppet valves always round and not elliptical or asymmetric or an array of smaller valves that would give proportionately more flow area? I would imagine because for the longest time, circular was the only easy (read: cheap) shape to make. Even today it's still probably the cheapest by a long shot. What still surprises me to this day is that when Honda made the NR engine (that's the one with oval pistons), they stuck with a conventional circular poppet valves.
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Sep 19, 2012 03:51
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I think there is something about a round valve that contributes to them being self sealing i.e. the more pressure in the cylinder the tighter the seal? If you had a valve that was square or had weird angles and stuff it wouldn't make a good seal unless it was perfectly aligned and whatnot.
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Sep 19, 2012 03:57
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Tekne posted:That would be and sound amazing. Especially considering that the current limitation of the multiair heads is that they are too big and limit an OHC head to being SOHC. A pushrod engine would not have this issue and a large OHV V8 would actually be a better application of the multiair tech than a small OHC inline engine.
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Sep 19, 2012 04:04
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Throatwarbler posted:Especially considering that the current limitation of the multiair heads is that they are too big and limit an OHC head to being SOHC. A pushrod engine would not have this issue and a large OHV V8 would actually be a better application of the multiair tech than a small OHC inline engine. And you could have some semblance of VVT on a pushrod motor with that, running a high-overlap performance cam and reducing overlap with the multiair system.
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Sep 19, 2012 05:02
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Well all GM and Chrysler pushrod engines already use VVT if I'm not mistaken, with a phase actuator on the camshaft. But the variability is limited since there is only 1 camshaft the overlap can't be altered because both intake and exhaust timing will be advanced at the same time. The Viper's V10 actually does have true VVT through concentric camshafts.
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Sep 19, 2012 05:47
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Cream_Filling posted:The accident argument seems fairly reasonable, though you would have to look at accident rates over time to see just how common it is to total out cars over time (I bet it's less common than you think). But not really the rust one. You can stop rust by spending money on engineering. Advanced rust protection techniques pretty much fall apart when a car has been in a collision. Modern body shops do pretty much poo poo work across the board. The work performed by a body shop would take any advanced rust protection and lower it to the same level as any other car. KYOON GRIFFEY JR posted:Because they're not necessary and other parts of the car will fail far in advance of the wheel bearings on a normal duty schedule, and consumers would prefer to save a couple hundred bucks on something they really don't need and doesn't have any noticeable impact.
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Sep 20, 2012 01:04
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PBCrunch posted:Except upgraded wheel bearings would probably cost Ford maaaaybe three dollars per corner. Multiply 3 dollars by four corners by 100k units, and you're looking at 1.2 million dollars in basically free money, since most customers can't tell the difference and still won't be replacing them for years. Of course, keep doing that going through every component in the car again and again and eventually you have a 90s GM product. OXBALLS DOT COM fucked around with this message at 01:25 on Sep 20, 2012 |
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Sep 20, 2012 01:20
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Throatwarbler posted:[T]he closest comparable system, and they're not really the same either, would the Toyota's VVTL-i that they only used on one engine and no longer make. I miss that Matrix so much. Insane little car.
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Sep 20, 2012 01:47
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Cream_Filling posted:Multiply 3 dollars by four corners by 100k units, and you're looking at 1.2 million dollars in basically free money, since most customers can't tell the difference and still won't be replacing them for years.
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Sep 20, 2012 07:20
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It's possible that the 2014 Corvette no longer shares a steering wheel and seats from a Cobalt.  
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Sep 20, 2012 07:56
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Thanks for the preview of the 2014 Cruze SS interior.
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Sep 20, 2012 08:14
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MrChips posted:I would imagine because for the longest time, circular was the only easy (read: cheap) shape to make. Even today it's still probably the cheapest by a long shot. It's probably easier to manufacture in terms of balancing and I would also imagine that heat dissipation properties are better as well.
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Sep 20, 2012 12:22
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It is flat out a thousand times easier to make something with a circular profile than oval, especially to make a consistent batch.
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Sep 20, 2012 15:03
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Throatwarbler posted:It's possible that the 2014 Corvette no longer shares a steering wheel and seats from a Cobalt. Did the Cobalt seats have adjustable bolsters, because the 2011 'vette did. I seem to remember the Cruze steering wheel being flat out nicer than the Corvette one though.
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Sep 20, 2012 16:29
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I expect the new Vette to have a significantly better interior since Chrysler upped the ante big time with the Viper. Also: Expect a much more expensive MSRP.
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Sep 20, 2012 16:37
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Cocoa Crispies posted:Did the Cobalt seats have adjustable bolsters, because the 2011 'vette did. I'm just kidding about the seats. For 2012 they put in new seats that were a major step up.  The Cobalt probably didn't have adjustable bolsters, considering the interior was so terrible that it actually didn't pass Federal vehicle safety regulations. The NHTSA had to force GM to recall it and put in softer materials so you don't dash your brains out in a minor accident. NHTSA posted:Vehicle Make / Model: Model Year(s):
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Sep 20, 2012 16:49
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MrChips posted:What still surprises me to this day is that when Honda made the NR engine (that's the one with oval pistons), they stuck with a conventional circular poppet valves.
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Sep 20, 2012 17:01
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Drove a Cadillac ATS this morning. It was the 2.5 automatic; they haven't started production on the 2.0s yet. Was completely blown away at how good it was even in the worst configuration. The interior is best in class hands down. The only thing I didn't warm up to was the instrument cluster. I wish they had put the huge info screen between two defined pods of gages like Audi is doing. The CUE system worked surprisingly well and intuitively. The 2.5 is okay but not great. Certainly no worse than the base 4 in the MB C class, which is equally un engaging. Handling and ride are arguably better than the 3 series. Definitely more road feel and just as balanced. I may just buy a 2.0 manual next year...
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Sep 20, 2012 20:18
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Tekne posted:I think we can expect to see some awesome products from Fiatsler in the coming years. An Italian poster on Allpar shared this interesting tidbit: Ask a Merc SLS owner if they care that their car is a Viper underneath, I'm sure they won't even notice (or believe you). The fact is, Americans have always done large cars fairly well, and trucks to great effect, and Europeans have always had the best small cars and sports cars. A company that gets the best of both worlds with management that isn't retarded, like Chrysler and Fiat seem to have, is just going to be awesome. They certainly can't gently caress up Chrysler anywhere near what MB did, that was a loving travesty.
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Sep 20, 2012 23:04
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VikingSkull posted:Ask a Merc SLS owner if they care that their car is a Viper underneath, I'm sure they won't even notice (or believe you).  I'm almost scared to be run out of AI by admitting I owned one. In my defense, it was the first car I bought on my own... Sorry, that isn't a defense, just a testament to my stupidity and excessive alcohol intake in my early 20s. Edit: I've tried to make up for it with an LS2 and an LS6 since then. Loan Dusty Road fucked around with this message at 06:37 on Sep 21, 2012 |
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Sep 21, 2012 06:32
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So other than looking kind of goofy what's wrong with it?
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Sep 21, 2012 06:54
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Some of the worst rearward visibility of any car I've ever been in, for one.
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Sep 21, 2012 07:05
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