3.6L DOHC V-6 Ward’s 10 Best Engines Winner

[Mr. Wyndham]

Originally Posted by theholycow

No throttle plate. The intake is wide open at all times. It's kinda like a diesel engine with spark plugs and lower compression. The gas pedal operates the fuel injectors, not an intake restriction. According to http://en.wikipedia.org/wiki/Gasoline_direct_injection it can run as lean as 65:1 (hooray for gas savings!). It doesn't say how rich it can run.

I'm sorry, mate. Though I don't doubt that you know what you're talking about...this isn't the case for GM's 3.6 DI. It has a throttle plate, and it moves. Read this or at least open it and search for "throttle".

http://media.gm.com/us/powertrain/en...FV6/08_LLT.doc

[Sholt_c33]

Found this pic over on CZ28 and didn't see it here...which 3.6 do you think this is?

[AirGoya]

^^^^^^^^^^^^^ Why have i never seen that before???!?!?!?!?!!
Can you give us the link cause i cant find the thread?

Nevermind, found it.

[Sholt_c33]

Originally Posted by AirGoya

^^^^^^^^^^^^^ Why have i never seen that before???!?!?!?!?!!
Can you give us the link cause i cant find the thread?

It was buried in the thread about the production line pics...

http://www.camaroz28.com/forums/show...=607253&page=2

post #26...there isn't any other info other than the pic...so I was just curious if anyone else had some input.

EDIT: more photos here --> http://www.camaro5.com/forums/showthread.php?t=4207

[Captain Awesome]

This fact will expose ME for the science geek that I am. Throttles are used on jet engines as well as rocket engines and work in similar fashion to the way they do on newer engines. They've been using these types of "throttle" mechanisms for decades.

I don't think we need to change our terminology just because the hardware has advanced in our cars.

P.S. Throttle is also a verb!

[theholycow]

Originally Posted by Dragoneye

I'm sorry, mate. Though I don't doubt that you know what you're talking about...this isn't the case for GM's 3.6 DI. It has a throttle plate, and it moves. Read this or at least open it and search for "throttle".

Drat. Well, it was a nice hope, anyway.

Originally Posted by Captain Awesome

I don't think we need to change our terminology just because the hardware has advanced in our cars.

P.S. Throttle is also a verb!

Well, I was talking about an engine where there is no need to variably limit the air intake opening (or "to do any throttling"), but apparently GM's DI V6 is not such an engine. Such engines do exist -- for example, all diesel engines. I'm pretty sure that some other manufacturers' GDI engines also have no ability to limit the incoming air volume.

Folks, I stand corrected. GM's DI is NOT throttleless. I'd assume that it does open the throttle a lot more than a traditional gasoline engine, though, so maybe it still has some of gains found in a throttleless GDI engine.

[camaro5]

Here you go my friends...


The motivation behind our patented Valvetronic technology was simple: to enable the engine to breathe more easily. Our engineers believed that this would allow for increased power output and optimized fuel efficiency, and they were right. It was accomplished by varying the lift height of the valves to regulate intake instead of using a traditional throttle. At lower engine loads, the valves only open a small amount, and at full power they open completely.

http://www.bmwusa.com/Standard/Conte...WPtfhQPZGVdw==


And here:

Nissan says about 35% of the parts are unique to the 3.7L VQ, and the major new addition is the electronically adjusted variable valve lift (Variable Valve Event and Lift), imparting a “throttleless” effect not unlike BMW AG’s Valvetronic, which also markedly reduces pumping losses by essentially throttling the engine with the intake valves.

http://wardsauto.com/reports/2008/te...ssan_3-7l_v-6/

[fastball]

Originally Posted by camaro5

Here you go my friends...


The motivation behind our patented Valvetronic technology was simple: to enable the engine to breathe more easily. Our engineers believed that this would allow for increased power output and optimized fuel efficiency, and they were right. It was accomplished by varying the lift height of the valves to regulate intake instead of using a traditional throttle. At lower engine loads, the valves only open a small amount, and at full power they open completely.

http://www.bmwusa.com/Standard/Conte...WPtfhQPZGVdw==


And here:

Nissan says about 35% of the parts are unique to the 3.7L VQ, and the major new addition is the electronically adjusted variable valve lift (Variable Valve Event and Lift), imparting a “throttleless” effect not unlike BMW AG’s Valvetronic, which also markedly reduces pumping losses by essentially throttling the engine with the intake valves.

http://wardsauto.com/reports/2008/te...ssan_3-7l_v-6/

Honda's VTEC does the exact same thing that Valvetronic, VVEL, VVT, VVT-i, and all the others do. That does not complicitly exclude the existance of a throttle on the intake manifold. In fact, Honda was the first to bring variable valve lift height and timing to mass production in the early 1990's, and their cars still had cable throttles.

[camaro5]

Originally Posted by fastball

Honda's VTEC does the exact same thing that Valvetronic, VVEL, VVT, VVT-i, and all the others do. That does not complicitly exclude the existance of a throttle on the intake manifold. In fact, Honda was the first to bring variable valve lift height and timing to mass production in the early 1990's, and their cars still had cable throttles.

Varible valve timing and lift have been around, but not INFINITELY varible.

This explanation below explains both - Valvetronic and VVEL are the extreme modern version of the earlier systems which now seem primitive compared to infinite lift control.

VTEC (which stands for Variable Valve Timing and Lift Electronic Control) is an electronic and mechanical system in some Honda engines that allows the engine to effectively have multiple camshafts. As the engine moves into different rpm ranges, the engine's computer can activate alternate lobes on the camshaft and change the cam's timing. In this way, the engine gets the best features of low-speed and high-speed camshafts in the same engine.



Valvetronic and VVEL

Several engine manufacturers are experimenting with systems that would allow infinite variability in valve timing. For example, imagine that each valve had a solenoid on it that could open and close the valve under computer control rather than relying on a camshaft. With this type of system, you would get maximum engine performance at every rpm range. Something to look forward to in the future...

SOURCE: http://auto.howstuffworks.com/question229.htm

Like I already said, welcome to the future!