• Jul 15, 2008
Not only is team Corvette taking shots at the Nissan GT-R, besting its 'Ring time in the process, so is Acura with its well-publicized NSX replacement. Though we've seen more spy shots, renderings and videos than you can shake a stick at, there are a few more renderings over at 7Tune if you are so inclined. What's more interesting, though, is news that the 5.5L V10 engine expected under the hood of the supercar will include relatively aggressive cylinder deactivation technology. The V10 will reportedly be able to cut its cylinder count in half by running as a 2.75L inline five-cylinder when its full capacity isn't needed. We would imagine that would be quite often, as the car's expected power output of six-hundred horses attests.
In what seems like a highly unlikely possibility, some sources are also reporting that a version of the V10 engine from the NSX could see duty in a future Acura RL sedan. Considering that the RL has never featured anything more than six cylinders underhood, this would be an extremely radical departure for Acura. In other words, don't hold your breath.

[Source: 7Tune]


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  • 24 Comments
      • 6 Years Ago
      I'll be surprised if the next RL even has a V8.

      In a good way, especially if it's also offered with a V6, like most of its direct competitors. I think it'd help Acura move a little more upmarket, closer to its rivals.
      • 6 Years Ago
      The Mercedes V12 has had cylinder deactivation since 1999 in Europe, and 2000 in the U.S. MB claims 7% city/20% steady state improvement.

      http://autospeed.com/cms/A_2623/article.html

      While this seems like a lot of complexity to add for modest efficiency gains, the real "problem" here is the 600hp target itself. In order for the NSX to be competitive in the supercar marketplace, 600hp is about right, especially when you consider the lack of torque in Honda's designs, and the fact that Acura/Honda has the capability to build a lighter car than most automakers.

      Boosted smaller engines, say a 600hp turbo V8, wouldn't make the fuel economy figures of an "inline 5" on the highway. I'd bet the V8 Turbo/Intercooler setup would be heavier as well. Turbo V6? The GT-R is an excellent example here, but what are it's fuel economy figures (unpublished). I'd bet in the low 20's highway.

      Your buddy's 4 cyl Evo with the big turbo might make 600hp, and it might even approach the 20+ mpg highway figure, but he does it with total disregard for EPA laws, engine durability, sound level issues, etc., luxuries the automakers do not have.

      I doubt Honda wants to use pushrods to equal the Corvette Z06's 24mpg highway. Of course, the Vette's "only" 505hp, but I am sure the torque figures of the two engines would be comparable, if not in GM's favor. (like it or not, GM's small blocks are impressive engines):

      http://www.roadandtrack.com/article.asp?section_id=31&article_id=6169

      So, given the alternatives, cylinder deactivation isn't all that bad. Plus, if money/talent starved Chrysler can pull it off reliably with the 5.7 Hemi (though probably a Daimler contribution -reference above), I'm sure quality obsessed Acura will have few problems with reliability/durability. Heck, the V-Tec systems they have are just as complex, if not more.

      I like horsepower. I love torque! I drive a 520hp/480tq Kenne Bell '05 Mustang, which gets about 25hwy, 17 city, all EPA systems in place. Perhaps this is the route Acura should take? But what about packaging (Mustang is big, long hood, bulky)? NSX need a Low center of gravity (KB supercharger on top of engine is not exactly optimal)?

      Bottom Line: Many choices an automaker faces. Given Honda/Acura's talent and track record, they probably know what they're doing.

      Still, I am left wondering if my Modular 4.6 would actually get 20% better on the highway with cylinder deactivation (30 mpg!).



        • 6 Years Ago
        pushrod doesn't equal high mpg for the vette...the reason it gets such good mpg on highway is the gearing. its has an extremely lonnnnng OD gear
      • 6 Years Ago
      The RL having the V10 found in the NSX is a high possibility. I say this because the new RL, as some should know, is said to have a much longer wheelbase to directly compete with the likes of the S-Class Mercedes and the 7-Series BMW. However, I think that the V10 whould come with the range topper, not so much the lower trim level, such as we now are seeing in the 2009 TL.
      • 6 Years Ago
      Yeah this V-10 sounds like just the thing to save ACura's ass. They better not put it in the accord tho
      • 6 Years Ago
      the best solution for fuel economy is a light right foot. jezza proved this w/ the m3 vs the prius (unscientifically of course). why cripple a supercar from the get go? more stuff to break as yacoub stated.
        • 6 Years Ago
        And with the 800 mile run in an Audi A8 diesel!
      • 6 Years Ago
      It just better look good. I'd rther have a nice looking car with 3-4 MPG- Than have a Honda Fit....I MEAN- Ugly car, and get 36 MPG.
      • 6 Years Ago
      "Considering that the RL has never featured anything more than six cylinders underhood, this would be an extremely radical departure for Acura. In other words, don't hold your breath."

      HONDA has never featured anything more than six cylinders underhood. If they're doing it with the NSX, they can do it elsewhere. Q.E.D.
      • 6 Years Ago
      Kinda feels like someone made up a rumor for the same of having one.
        • 6 Years Ago
        i do feel that way about rumours sometimes
        • 6 Years Ago
        ugh, *sake*
      • 6 Years Ago
      Cylinder Deactivation in the Accord and new Pilot is WORTHLESS, it kills midrange torque and offers NO real improvement on fuel consumption.
        • 6 Years Ago
        No offense, but since when was Honda concerned with mid-range torque?
        jh00d08
        • 6 Years Ago
        Amen to that, I have test driven a few Honda vehicles and simply left to other companies because the Hondas lacked torque in the mid to higher ranges.
        • 6 Years Ago
        I'm going by the new EPA numbers and real world numbers.


        ALSO, the V6 Accord Coupe is much more livelier than the Accord V6 sedan because it does NOT have VCM! VCM reduces torque output infavor of MPG, and the MPG isn't even considerably better.
        • 6 Years Ago
        Do you own an Accord or Pilot with this Cylinder Deactivation? I have owned two Honda Minivans - an 04' with the 3.5 without it, and now an 08 3.5 with deactivation. I guarantee the deactivation makes a difference - When cruising on the interstate at 75mph the difference is about 6-8 mpg shown directly on the in-dash indicator immediately when the "Eco" light comes on. However, it rarely comes on if you do not have your cruise control set. I regularly drive about 250 interstate miles with this vehicle - the new one gets at least 5mpg better numbers on a consistent basis. Over a 100,000 mile life of my vehicle it comes to over a $5000 difference at current prices (which are only going up) - I'll take that difference (oh and by the way - I have the 100,000 mile power train warranty on a certified used - so no maintenance issues to worry about).
      • 6 Years Ago
      The Accord V6 has cylinder deactivation to drop from 6-to-4-to-3. However, the one V6 Accord model (Accord Coupe EX-L V6) which offers a manual transmission won't work with cylinder deactivation. An auto is required to allow enough predictability to operate VCM.

      This would indicate the NSX replacement will be a clutchless manual only, flappy-paddle affair like the GT-R or worst case scenario (shudder) an automatic.
      • 6 Years Ago
      As someone else posted earlier, I can see a V10 going in an NSX, but not in an RL.
      Can Acura PLEASE make the next RL's AWD system RWD-based? PLEASE?
      • 6 Years Ago
      V10 in an NSX I can see because the NSX is not being built for the "average Joe." In a RL I can't see at all. For Honda, who prides themselves on being ecologically and environmentally conscious, to go from a V6 to a V10 with today's fuel prices... would be crazy. I honestly don't see the RL ever getting even a V8 as standard, but more as an option.
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