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what is VCT?? 

 

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 Post subject: what is VCT??
Posted: Sat Feb 09, 2008 7:07 pm 
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i have a stupid question... i have a mate with a series 3 au xr6 and we were wondering what VCT stands for....

i took a stab and said Variable Cam Timing??

 

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Posted: Sat Feb 09, 2008 7:22 pm 
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Good Stab.

 

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Posted: Sun Feb 10, 2008 11:32 am 
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so i take it i'm correct?

is it anything like VTECH honda's?

 

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Posted: Sun Feb 10, 2008 12:51 pm 
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VCT stands for "= Crap to do up with aftermarket cams"... :lol:

 

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Posted: Sun Feb 10, 2008 4:08 pm 
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so like the honda vtech, the computer can control the cam timing

 

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Posted: Sun Feb 10, 2008 4:40 pm 
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only thing is it works while under cruise and not when u put the boot into it, it changes the timing and gives lower rpm and increased fuel econamy aparetly but i get s**t k's anyway.lol

 

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Posted: Sun Feb 10, 2008 5:29 pm 
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Its not like vtec, vtec phsically moves the position of the cam to alter valve timing. Not exactly sure how VCT changes cam timing.

 

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Posted: Sun Feb 10, 2008 5:31 pm 
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smiley235 wrote:
Its not like vtec, vtec phsically moves the position of the cam to alter valve timing. Not exactly sure how VCT changes cam timing.


can anyone explain to me how it works??? i'm quite interested

 

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Posted: Sun Feb 10, 2008 5:39 pm 
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as far as i know and have had discussions with the guys at G&D performance, it only works at cruise as i said before and it retards cam timing to give you better economy, i wish it would work through out the rev range as you could change it to give better down low and middle tourqe and what not.but yeah i dony know why ford did it but its a grouse engine and definatly has potential with some mods as its similar to the HP head.

 

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Posted: Sun Feb 10, 2008 7:46 pm 
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caseyaberhart wrote:
smiley235 wrote:
Its not like vtec, vtec phsically moves the position of the cam to alter valve timing. Not exactly sure how VCT changes cam timing.


can anyone explain to me how it works??? i'm quite interested

VTEC doesn't change cam timing, it actually changes cam lift.
From memory it does it by changing the rocker ratio somehow?
Dunno, cant remember now.

VCT moves the whole cam/cams.

 

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Posted: Sun Feb 10, 2008 10:59 pm 
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[/quote]
VTEC doesn't change cam timing, it actually changes cam lift.
From memory it does it by changing the rocker ratio somehow?
Dunno, cant remember now.

VCT moves the whole cam/cams.[/quote]

so can anyone explain how VCT achieves this?

 

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Posted: Mon Feb 11, 2008 12:13 am 
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There was a good youtube video posted a while ago by (I think) xcabbi, if anyone could give me a link I'd be grateful.

Basically, the camshaft is suspended in a sproket and can be physically pushed fowards or backwards laterally in relation to the valve gear (using pressurized engine oil in chambers on either side of the camshaft) to advance or retard the timing. Its hard to explain in words but the youtube video I have in mind explains it really well.

Edit: here's a simular one though not what I had in mind:
[youtube]http://youtube.com/watch?v=dSZXepU7Sks[/youtube]

 

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Posted: Mon Feb 11, 2008 1:29 am 
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fnp wrote:
There was a good youtube video posted a while ago by (I think) xcabbi, if anyone could give me a link I'd be grateful.

Basically, the camshaft is suspended in a sproket and can be physically pushed fowards or backwards laterally in relation to the valve gear (using pressurized engine oil in chambers on either side of the camshaft) to advance or retard the timing. Its hard to explain in words but the youtube video I have in mind explains it really well.

Edit: here's a simular one though not what I had in mind:
[youtube]http://youtube.com/watch?v=dSZXepU7Sks[/youtube]
yes,xcabbi posted it------youtube-car engine ford ti-vct 3d,enjoy! good stuff,more $$$$$$$$$$$$$ in service costs :evil: :evil:

 

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Posted: Mon Feb 11, 2008 12:13 pm 
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Found the video I was looking for.

[youtube]http://youtube.com/watch?v=Ba-oyIjGWGE[/youtube]

 

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Posted: Mon Feb 11, 2008 12:51 pm 
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the above vid is very interesting...... clever f**k who invented VCT thats for sure
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