displacement on demand
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displacement on demand
i was reading a thread on the japanese version of the accord (the inspire i think) on caranddriver.com and it said that that version of the accord has displacement on demand and basically just shuts off fuel injectors to 3/6 cylinders at cruising speed to improve gas milaege. could us owners of older less technological cars also hyst make a "switch" to shut off the fuel injectors to improve milage? i'm not saying i'm gunna do this i'm just wondering what else is involved.
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Joined: Dec 2002
Posts: 2,748
shut off the fuel injectors?! then you wouldnt be getting the proper air/fuel mixture making your car run retarded. You would need an ECU among other things to make that work. all the money and time invested to even make that pluasible wouldnt offset the minute gas you would actually save...Its definately just more complicated than turning off 2 injectors...
Eric
Eric
It's nothing that new. GM has done this on their V8 engines. Cadallic I think. I greatly improves gas mileage and all the cylinders kick in when you push the go pedal past a certain amount. Retro fit onto older cars? Seriously doubt it. This system randomly cuts off diff cylinders to dist wear/tear etc..
Plus if you cut off even 2 cylinders, you would be asking too much of a "4 banger" to handle.
Plus if you cut off even 2 cylinders, you would be asking too much of a "4 banger" to handle.
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Joined: Feb 2003
Posts: 139
The Chevy/gm implementation is dependent on the use of pushrods and lifters. The lifters can be moved to one side of the cam and thus there is no air flow through the combustion chambers on that side.
I am not familiar with the honda implementation, but if it works as you said then it is "possible" to engineer a similar system on our cars, but not plausable.
I am not familiar with the honda implementation, but if it works as you said then it is "possible" to engineer a similar system on our cars, but not plausable.
Also remember that if there is a larger engine at a 20% load it will run much more efficiently than a smaller engine at a 60% load. Nissan gears our cars lower to use the power we have more efficiently, ever notice how our first gear will go to 30-45mph (5spd-auto) and how some cars with a 4 cylinder engine can only go upto 20mph in first gear?
Did you also know that once your engine is above 180* you will have substancially less wear on your engine than if it is at 160*, or 140*.
Did you know that metal expands? That if your engine is too hot (260*) that you have alot of wear on your engine because of the expansion? Did you know that running an engine (too) lean will raise the temperature of the engine, also not provide a clean burn, and rob you of power?
I didnt know it either until a few months ago when flames shot out of my carb on the mustang.
Did you also know that once your engine is above 180* you will have substancially less wear on your engine than if it is at 160*, or 140*.
Did you know that metal expands? That if your engine is too hot (260*) that you have alot of wear on your engine because of the expansion? Did you know that running an engine (too) lean will raise the temperature of the engine, also not provide a clean burn, and rob you of power?
I didnt know it either until a few months ago when flames shot out of my carb on the mustang.
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Joined: May 2001
Posts: 514
Originally posted by MrGone
Also remember that if there is a larger engine at a 20% load it will run much more efficiently than a smaller engine at a 60% load. Nissan gears our cars lower to use the power we have more efficiently, ever notice how our first gear will go to 30-45mph (5spd-auto) and how some cars with a 4 cylinder engine can only go upto 20mph in first gear?
Did you also know that once your engine is above 180* you will have substancially less wear on your engine than if it is at 160*, or 140*.
Did you know that metal expands? That if your engine is too hot (260*) that you have alot of wear on your engine because of the expansion? Did you know that running an engine (too) lean will raise the temperature of the engine, also not provide a clean burn, and rob you of power?
I didnt know it either until a few months ago when flames shot out of my carb on the mustang.
Also remember that if there is a larger engine at a 20% load it will run much more efficiently than a smaller engine at a 60% load. Nissan gears our cars lower to use the power we have more efficiently, ever notice how our first gear will go to 30-45mph (5spd-auto) and how some cars with a 4 cylinder engine can only go upto 20mph in first gear?
Did you also know that once your engine is above 180* you will have substancially less wear on your engine than if it is at 160*, or 140*.
Did you know that metal expands? That if your engine is too hot (260*) that you have alot of wear on your engine because of the expansion? Did you know that running an engine (too) lean will raise the temperature of the engine, also not provide a clean burn, and rob you of power?
I didnt know it either until a few months ago when flames shot out of my carb on the mustang.
Senior Member
Joined: Feb 2003
Posts: 139
Originally posted by MrGone
Also remember that if there is a larger engine at a 20% load it will run much more efficiently than a smaller engine at a 60% load. Nissan gears our cars lower to use the power we have more efficiently, ever notice how our first gear will go to 30-45mph (5spd-auto) and how some cars with a 4 cylinder engine can only go upto 20mph in first gear?
Did you also know that once your engine is above 180* you will have substancially less wear on your engine than if it is at 160*, or 140*.
Did you know that metal expands? That if your engine is too hot (260*) that you have alot of wear on your engine because of the expansion? Did you know that running an engine (too) lean will raise the temperature of the engine, also not provide a clean burn, and rob you of power?
I didnt know it either until a few months ago when flames shot out of my carb on the mustang.
Also remember that if there is a larger engine at a 20% load it will run much more efficiently than a smaller engine at a 60% load. Nissan gears our cars lower to use the power we have more efficiently, ever notice how our first gear will go to 30-45mph (5spd-auto) and how some cars with a 4 cylinder engine can only go upto 20mph in first gear?
Did you also know that once your engine is above 180* you will have substancially less wear on your engine than if it is at 160*, or 140*.
Did you know that metal expands? That if your engine is too hot (260*) that you have alot of wear on your engine because of the expansion? Did you know that running an engine (too) lean will raise the temperature of the engine, also not provide a clean burn, and rob you of power?
I didnt know it either until a few months ago when flames shot out of my carb on the mustang.
I don't mean to mock you, but have you ever learned anything about how an engine works? The most difficult aspect of designing an efficent engine is temperature control. (The most difficult area to control the temperature of is the exhaust valve) You make some interesting points though. Obvious, but still important.
Also EVERYTING except ice and rubber expands when it heats up.
Originally posted by kingcarnage
I don't mean to mock you, but have you ever learned anything about how an engine works? The most difficult aspect of designing an efficent engine is temperature control. (The most difficult area to control the temperature of is the exhaust valve) You make some interesting points though. Obvious, but still important.
Also EVERYTING except ice and rubber expands when it heats up.
I don't mean to mock you, but have you ever learned anything about how an engine works? The most difficult aspect of designing an efficent engine is temperature control. (The most difficult area to control the temperature of is the exhaust valve) You make some interesting points though. Obvious, but still important.
Also EVERYTING except ice and rubber expands when it heats up.
yep, I was meaning to make some obvious points
honestly though, rubber does not expand when it heats up?
Originally posted by MrGone
yep, I was meaning to make some obvious points
honestly though, rubber does not expand when it heats up?
yep, I was meaning to make some obvious points
honestly though, rubber does not expand when it heats up?
Ice doesn't expand? OK, that's it. I'm gonna empty out my anti-freeze and fill the radiator with plain water and drive to the north pole. Cracked engine blocks and radiators be damned.
DW
DW
Originally posted by kingcarnage
I don't mean to mock you, but have you ever learned anything about how an engine works? The most difficult aspect of designing an efficent engine is temperature control. (The most difficult area to control the temperature of is the exhaust valve) You make some interesting points though. Obvious, but still important.
Also EVERYTING except ice and rubber expands when it heats up.
I don't mean to mock you, but have you ever learned anything about how an engine works? The most difficult aspect of designing an efficent engine is temperature control. (The most difficult area to control the temperature of is the exhaust valve) You make some interesting points though. Obvious, but still important.
Also EVERYTING except ice and rubber expands when it heats up.
Originally posted by dwapenyi
Ice doesn't expand? OK, that's it. I'm gonna empty out my anti-freeze and fill the radiator with plain water and drive to the north pole. Cracked engine blocks and radiators be damned.
DW
Ice doesn't expand? OK, that's it. I'm gonna empty out my anti-freeze and fill the radiator with plain water and drive to the north pole. Cracked engine blocks and radiators be damned.
DW
Also EVERYTING except ice and rubber expands when it heats up.
-hype
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Joined: May 2001
Posts: 514
Originally posted by MrGone
yep, I was meaning to make some obvious points
honestly though, rubber does not expand when it heats up?
yep, I was meaning to make some obvious points
honestly though, rubber does not expand when it heats up?
Doh! He was a sneaky on that one!
DW
DW
Originally posted by xHypex
Read more carefully. Ice does not expand when heated up. Heating it up breaks the crystalline structure and brings the molecules closer together. I can't comment on rubber.
-hype
Read more carefully. Ice does not expand when heated up. Heating it up breaks the crystalline structure and brings the molecules closer together. I can't comment on rubber.
-hype
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