Re: Some details of the 2AZ-FE engine

On Mon, 21 Jul 2008 23:30:03 -0500, Leftie <No@[EMAIL PROTECTED]
> wrote:

>Retired VIP wrote:
>> On Mon, 21 Jul 2008 06:35:30 -0700 (PDT), EdV <systmengr@[EMAIL PROTECTED]
>
>> wrote:
>> 
>>> On Jul 18, 2:16 pm, Retired VIP <jackj.extradots....@[EMAIL PROTECTED]
>
>>> wrote:
>>>> On Fri, 18 Jul 2008 08:36:01 -0700 (PDT), EdV <systme...@[EMAIL PROTECTED]
>
>>>> wrote:
>>>>
>>>>> On Jul 18, 11:05 am, "C. E. White" <cewhi...@[EMAIL PROTECTED]
>
>>>>> wrote:
>>>>> There is an injector in the combustion chamber
>>>> Direct injection allows placing a rich fuel/air mixture around the
>>>> sparkplug and a much leaner mixture in the rest of the cylinder.  By
>>>> the time the flame front moves out to the rest of the cylinder, the
>>>> piston has moved past top dead center and the much faster burn rate
of
>>>> a lean mixture won't hurt the engine.
>>>>
>>>> I hope this helps and if I've gotten anything wrong in this, I'm sure
>>>> someone will correct me.
>>>>
>>>> Jack
>>> Great! So this means its possible not to have VVTi and Direct
>>> injection at the same time. The timing of the fuel comes from the
>>> nozzle and not from the opening of the valves, although air enters
>>> through the valves, its the fuel which is controlled and not the air.
>> 
>> No, I think it would still be possible to use variable valve timing
>> and direct injection at the same time.  The amount of fuel is
>> controlled by the engine computer based on info it gets from the O2
>> sensor, throttle position, RPM, etc.  VVTi would still be a valid way
>> to increase engine efficiency by controlling the amount of air, that's
>> really all it controls with multi-****t injection also.
>> 
>> Jack
>
>    I think you misread the post. He was saying it's possible to not 
>have both features, not that it's impossible to have both.

You are right lefty.  I did misread the OP's comments.  Sorry and he
would be right.  I guess I get in too much of a hurry sometimes.

Jack