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2495 Posts Member #: 1954 Post Whore Luton Bedfordshire |
6th Jul, 2013 at 04:55:58pm
Question. On variable valve engines what is the maximum angle of adjustment on the cam shafts? and is it an advanced opening adjustment as I belive or do they retard and advance the cam timing around what would be considered normal timing? Own the day
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 12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
6th Jul, 2013 at 05:02:24pm
well thats a comlicated question as most of the systems work differently,
Edited by Joe C on 6th Jul, 2013. On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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 9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
6th Jul, 2013 at 05:47:05pm
On 6th Jul, 2013 Joe C said:
when Vtec kicks in yo bahahaha Nissans nvcs runs the cam directly and can then advance the cam from its set point when active its either on or off, duration and lift remain the same Yes i moved to the darkside |
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3594 Posts Member #: 655 Post Whore Northern Ireland |
6th Jul, 2013 at 09:07:55pm
On 6th Jul, 2013 Mr Joshua said:
Question. On variable valve engines what is the maximum angle of adjustment on the cam shafts? and is it an advanced opening adjustment as I belive or do they retard and advance the cam timing around what would be considered normal timing? As said, depends on the car and system. Some are just one position or another, and others are totally variable. And some might be a small amount, others large. I know on Subarus, you can swing about 35deg on later systems. As for normal....there isnt really any normal with a variable system. Or do you mean what position might it revert to under a fault condition or if the system was turned off ? 9.85 @ 145mph
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2495 Posts Member #: 1954 Post Whore Luton Bedfordshire |
8th Jul, 2013 at 06:37:37pm
I was thinking of start position and failed position. I imagine the position for both would be the same. Own the day
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 1183 Posts Member #: 6926 Post Whore Accrington |
8th Jul, 2013 at 08:14:44pm
sod all that cam shit, someone start making a cylinder head for these babys
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1909 Posts Member #: 9764 Post Whore Northamptonshire. |
8th Jul, 2013 at 08:15:30pm
On 6th Jul, 2013 Joe C said:
the VVC system is (IIRC) the only truly variable duration system and actually slows down and speeds up the cam each engine cycle to achive this, / VVC system is a pain in the ass when timing up but you've put it in simple terms http://www.mgfcar.de/VVC_mechanic/vvc.pdf Like i said a pain but if anyone wished to read up on it. |
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3594 Posts Member #: 655 Post Whore Northern Ireland |
8th Jul, 2013 at 09:04:04pm
On 8th Jul, 2013 Mr Joshua said:
I was thinking of start position and failed position. I imagine the position for both would be the same. I guess that assumes that the failure allows return to a specific position, or just lets it run wild. I did come across a Nissan 200 engine once, and it just let the cam go where it wanted within the mechanical stops of the adjusting mechanism. 9.85 @ 145mph
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 1170 Posts Member #: 8636 Post Whore Surrey |
9th Jul, 2013 at 12:26:01pm
VVC
On 8th Jul, 2013 Johnny said:
sod all that cam shit, someone start making a cylinder head for these babys http://www.youtube.com/watch?v=Bch5B23_pu0 that was an amazing vid :o Edited by WRLondon on 9th Jul, 2013. Reading up on RTS Clutches On 21st Sep, 2006 Paul S said: Go on, be brave, put it in the car and tell us how it works. Pity your bollocks are in line with the flywheel! On 27th May, 2013 robert said:
putting my testicles on the line for turbo mini owners everywhere ,and they still work ! |
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 1713 Posts Member #: 8480 MS Paint flat cap champion & Morris Ital Lover From Sheffield now live in York tha noz |
9th Jul, 2013 at 12:43:27pm
wow
On 8th Jul, 2013 Johnny said:
sod all that cam shit, someone start making a cylinder head for these babys http://www.youtube.com/watch?v=Bch5B23_pu0 On 18th Oct, 2013 apbellamy said:
I am feeling particularly BACish today. On 5th Oct, 2014 Shauna said:
What that's crazy, you go commando hahaha! How heavy is your helmet  ? The Morris Ital assassin! |
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2495 Posts Member #: 1954 Post Whore Luton Bedfordshire |
11th Jul, 2013 at 11:08:57pm
So this was engine was in test at AVL, my brother is one of their test bed analyst's if that engine was there he may have been involved, time for a call
Own the day
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2495 Posts Member #: 1954 Post Whore Luton Bedfordshire |
11th Jul, 2013 at 11:13:57pm
Valentino Rossi's M1 Yamaha used pneumatic valves to great effect, however the big issue was high fuel consumption. Own the day
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2495 Posts Member #: 1954 Post Whore Luton Bedfordshire |
12th Jul, 2013 at 07:30:23am
Spoke to the brother and rumours of AVLs demise in Europe are no longer true. In summary for motor sport any gain is worth the cost but for mass production the gains do not justify the cost.
Own the day
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 2909 Posts Member #: 83 Post Whore Glasgow, Scotland |
17th Jul, 2013 at 12:02:41am
bmw have two systems, vanos, which alters cam timing, and valvetronic which alters valve lift by adjusting odd shaped rocker arms. the valvetronic equipped engines dont even need a throttle body as the valve lift is so controllable. most manufacturers now do the cam timing thing, mitsubishi and toyota have a variation of hondas vtec setup with a high lift lobe, im not sure anyone has came up with a setup to vary cam duration like rovers VVC, probably due to it being pretty weak/not worth the hastle. turbo 16v k-series 11.9@118.9 :)
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