-----Original Message-----
From: hotkey <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Wednesday, September 26, 2001 8:45 PM
Subject: Re: Varable Cam Timing
>The New BMW engines coming out in the next few months is the First
>Production engine to have Fully Variable Camtiming ..They advance and
>retard both inlet and exhaust cams ..AS well as being able to VARY the
Inlet
>Valve lift between .3mm to 9.7mm at any RPM ..Till now no one could FULLY
>vary the lift Which means it is possible for the engine to run without a
>throttle body at all .. the only reason they use a throttle body for vacuum
>for the brake booster as well as the Crankcase ventilation ..BMW has the
>Patent on it ..
hi ,why dont they just run a vacuum pump like deseils?
mark
>-----Original Message-----
>From: <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Date: Wednesday, September 26, 2001 2:42
>Subject: RE: Varable Cam Timing
>
>
>>Could be wrong...
>>But I thought the oil pressure activates the rockers for the lobes
>required?
>>
>>Iggy Sandejas
>>Sydney NSW
>>Datsun 1600 FJ20t
>>
>>
>>
>>-----Original Message-----
>>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
>>Sent: Wednesday, 26 September 2001 14:06
>>To: [EMAIL PROTECTED]
>>Subject: Re: Varable Cam Timing
>>
>>
>>
>>
>>The honda V-tec system has two lobe profiles ground side by side for each
>>valve. The whole camshaft slides forward or backward using engine oil
>>pressure to change from the mild to wild profile.
>>
>>Nick
>>>
>>> From: "Williams, Ritchie (Vertex
>>Hamilton)"<[EMAIL PROTECTED]>
>>> Subject: Re: Varable Cam Timing
>>> Date: 26/09/2001 15:39:37
>>> To: [EMAIL PROTECTED]
>>>
>>> James
>>>
>>> The most common way I've seen is a chain/belt tensioner on the tight
side
>>of the chain/belt
>>> activated by a hydraulic cylinder.
>>>
>>> As the cylinder pushes the tensioner the tight side of the chain/belt
>>effectively becomes shorter
>>> therefore advancing the cam timing. As the revs go up the more the cam
>>advances. This is all
>>> controlled by the engine computer.
>>>
>>> There are other variations on this theme.
>>>
>>> --
>>> Ritchie Williams
>>> Manager - Design Technology
>>> Vertex Pacific Limited
>>> 696 Te Rapa Rd
>>> Private Bag HN3044
>>> Hamilton
>>> New Zealand
>>> ph 64 7 8493 999
>>> fax 64 7 8498 764
>>> e-mail [EMAIL PROTECTED]
>>>
>>>
>>>
>>>
>>>
>>>
>>> James Cox wrote:
>>>
>>> > Ok I know this is a little off topic, but does anyone know how VCT
>>physicaly
>>> > works? Yes I know about the benifits of advanced timeing at higher
>>revs, I
>>> > was just curious how they do this mechanicly in the new engines.
>>> >
>>> > James Cox
>>> >
>>> > _________________________________________________________________
>>> > Get your FREE download of MSN Explorer at
>>http://explorer.msn.com/intl.asp
>>> >
>>>
>>>
>>
>>This message was sent through MyMail http://www.mymail.com.au
>>
>>
>>
>>
>
>
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