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 ..
-----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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