Variable Displacement
Thread Starter
Drifting
Joined: Aug 2002
Posts: 1,525
Likes: 1
From: Santa Cruz Mountains CA
Variable Displacement
I talked with a GM Engineer at the SAE show a week or so ago. He was involved with the design of the upcoming variable displacement engines.
(DoD Displacement on Demand ?)
I asked if variable displacement would be used in the Corvette. He said that it would first come out in a truck.
Now, it doesn't seem to me, that there is enough time to have it appear first in a truck and then have the C6 come equipped DoD. It seems to me that unless the new SSR has DoD, that the first C6s will not have this feature.
What do you think?
(DoD Displacement on Demand ?)
I asked if variable displacement would be used in the Corvette. He said that it would first come out in a truck.
Now, it doesn't seem to me, that there is enough time to have it appear first in a truck and then have the C6 come equipped DoD. It seems to me that unless the new SSR has DoD, that the first C6s will not have this feature.
What do you think?
Drifting
Joined: Mar 2003
Posts: 1,569
Likes: 0
From: Carolina
Re: Variable Displacement (Pipes)
I agree i think that DOD is not going to be available in the C6 right away.....
I hope that Variable Valve Timing, Dry sump lubrication and Titanium spring valves make it to production in the C6!!!!!!!
I hope that Variable Valve Timing, Dry sump lubrication and Titanium spring valves make it to production in the C6!!!!!!!
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Racer
Joined: Jan 2002
Posts: 274
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From: Dublin OH
Re: Variable Displacement (Mervz)
Sorry, I still remember those horrible Cadillacs of the early eighties, it may be greatly improved but I'll pass. How much do you want to bet that after these engines come out there will be many posts concerning how to disengage the system.
Le Mans Master
Joined: Feb 2000
Posts: 8,099
Likes: 398
From: Oakland, CA
Re: Variable Displacement (BIG99)
Sorry, I still remember those horrible Cadillacs of the early eighties, it may be greatly improved but I'll pass. How much do you want to bet that after these engines come out there will be many posts concerning how to disengage the system.
Twenty-five years of improvements in computer technology and its automotive powertrain applications renders any comparison to the old Cadillac 4-6-8 absurd. Consider that some of GM's powertrain engineers weren't even BORN when that engine was designed.
.Jinx
Safety Car
Joined: Dec 2001
Posts: 4,295
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From: Indianapolis Indiana
Cruise-In III Veteran
Cruise-In IV Veteran
Re: Variable Displacement (Jinx)
I say no just b/c the vette really doesn't need economy nearly as much as the millions of gas-thirsty full-size trucks sold each year. With gas prices jumping significantly in the foreseeable future the general will be in a better position to keep selling cars if it can produce an efficient yet powerful machine. And relative to the trucks, GM could care less about the C6...besides, they assume we'd be a lot more willing and able to pay for more gas than your everyday truck owner. Just MHO.
Melting Slicks
Joined: Apr 1999
Posts: 2,914
Likes: 4
From: Westford MA
Re: Variable Displacement (Jinx)
Sorry, I still remember those horrible Cadillacs of the early eighties, it may be greatly improved but I'll pass. How much do you want to bet that after these engines come out there will be many posts concerning how to disengage the system.
Nothing, because there will be no shortage of cavedwellers who demand all eight of the cylinders they paid for.
Twenty-five years of improvements in computer technology and its automotive powertrain applications renders any comparison to the old Cadillac 4-6-8 absurd. Consider that some of GM's powertrain engineers weren't even BORN when that engine was designed.
.Jinx
Nothing, because there will be no shortage of cavedwellers who demand all eight of the cylinders they paid for.
Twenty-five years of improvements in computer technology and its automotive powertrain applications renders any comparison to the old Cadillac 4-6-8 absurd. Consider that some of GM's powertrain engineers weren't even BORN when that engine was designed.
.Jinx
Scott
Le Mans Master
Joined: Feb 2000
Posts: 8,099
Likes: 398
From: Oakland, CA
Re: Variable Displacement (BQuicksilver)
I'm with LymanSS -- if I can get better fuel economy and it doesn't hurt performance, why wouldn't I want it? Sound at idle and cruise? I want my car to be quiet at idle and cruise anyway. I want my extra money for fuel to be spent having fun, not puttering around.
Besides, it's sweet when non-car people give me crap about driving a gas-guzzler only to discover I get better mileage than they do with their minivan.
.Jinx
Besides, it's sweet when non-car people give me crap about driving a gas-guzzler only to discover I get better mileage than they do with their minivan.
.Jinx
Le Mans Master
Joined: Jan 2000
Posts: 6,725
Likes: 0
From: South Bend IN
Re: Variable Displacement (Pipes)
I think your right about it debuting in the truck sector. That would definately ease up the CAFE standards big time for GM as a whole. Then i'll trade up to one as my 02 GMC K2500 gets about 10 to 12 mpg around town! My vette is a economy car in my household. :lol: :cheers: :thumbs:
☠☣☢ Semper Ebrius ☢☣☠
Joined: Jun 2001
Posts: 83,301
Likes: 4
From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Re: Variable Displacement (Jinx)
I'm with LymanSS -- if I can get better fuel economy and it doesn't hurt performance, why wouldn't I want it? Sound at idle and cruise? I want my car to be quiet at idle and cruise anyway. I want my extra money for fuel to be spent having fun, not puttering around.
Besides, it's sweet when non-car people give me crap about driving a gas-guzzler only to discover I get better mileage than they do with their minivan.
Besides, it's sweet when non-car people give me crap about driving a gas-guzzler only to discover I get better mileage than they do with their minivan.
Burning Brakes
Joined: Sep 2001
Posts: 805
Likes: 0
From: College Station / Highland Village TX
Re: Variable Displacement (Scissors)
You know on the RPO list that was running around a couple days ago? (And now I can't find it.) I thought it listed the LS-4 as a 5.3 L with "Cylinder Deactivation". I can't find the list now to check but hopefully someone else will do that for me. Anyway I heard/read somewhere that the SSR was going to get that particular engine. Assume I've got all my facts straight (which is admittedly unlikely due to my inability to reproduce my own sourced and the sheer time of night) then we should see DoD sometime later this year, right?
Someone please go check this out for me, I can't figure out where I found the info the first time but that's the impression I was under. :banghead:
Someone please go check this out for me, I can't figure out where I found the info the first time but that's the impression I was under. :banghead:
Race Director
Joined: May 2000
Posts: 12,712
Likes: 2,271
Re: Variable Displacement (Jinx)
Sound at idle and cruise? I want my car to be quiet at idle and cruise anyway. .Jinx
Duke
☠☣☢ Semper Ebrius ☢☣☠
Joined: Jun 2001
Posts: 83,301
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Re: Variable Displacement (SWCDuke)
DoD will give maximum fuel economy benefits during freeway cruise, and a DoD Corvette should achieve 30-35 MPG freeway cruise economy, even with 500 HP on tap under foot.