MK5 Golf GTI

All Things Mk5 => Modifications & Technical Area => Technical Workshop => Topic started by: veedubbubh on August 26, 2009, 08:44:23 pm

Title: Variable valve timing
Post by: veedubbubh on August 26, 2009, 08:44:23 pm: Hi people,

Simple question - does MKV GTI have variable valve timing - if so what kind and any other details would be helpful.

Many thanks.
Title: Re: Variable valve timing
Post by: WILLZIE on September 12, 2009, 02:50:05 pm: Im sure it has, but only on 1 camshaft!
Title: Re: Variable valve timing
Post by: veedubbubh on September 13, 2009, 09:34:20 pm: Thanx,

I am assuming its the Audi "valve-lift" type?
Title: Re: Variable valve timing
Post by: john_o on September 14, 2009, 08:13:13 am: this may be useful

http://www.golfmkv.com/forums/golfgoodies/mk5golfengine.pdf (http://www.golfmkv.com/forums/golfgoodies/mk5golfengine.pdf)

as well as the general manuals that TT posted links to

TT links to various manual pages (http://www.mk5golfgti.co.uk/forum/index.php?topic=1797.0)

hth :happy2:
Title: Re: Variable valve timing
Post by: veedubbubh on September 15, 2009, 12:18:34 am: MKV GTI (original engine anyway) has - continuous variable valve timing on the intake camshaft which is turbo-related.

So now you know!!

Anyone available to explain that a bit better? TT?

Thanks again.
Title: Re: Variable valve timing
Post by: Teutonic_Tamer on September 18, 2009, 03:49:16 pm: Quote from: veedubbubh on September 13, 2009, 09:34:20 pm
Thanx,

I am assuming its the Audi "valve-lift" type?

Nope. The Audi 'valvelift' actually varies the 'lift' of the valve, ie, how far down into the combustion chamber they poke. Our beloved Mk5s don't have any variable lift technology, nor does the Mk6. It would seem that Audi are keeping their valvelift to themselves!
Title: Re: Variable valve timing
Post by: Teutonic_Tamer on September 18, 2009, 03:51:34 pm: Quote from: veedubbubh on September 15, 2009, 12:18:34 am
MKV GTI (original engine anyway) has - continuous variable valve timing on the intake camshaft which is turbo-related.

So now you know!!

Anyone available to explain that a bit better? TT?

Thanks again.

Hmmmm . . . . the VVT on the inlet camshaft isnt turbo related at all. It is simply controlled by the ECU map, and the actual timing is 'advanced' by oil pressure in a vane pump type of adjuster on the battery end of the engine.
Title: Re: Variable valve timing
Post by: veedubbubh on September 26, 2009, 07:49:42 pm: Ok interesting - so when I step on the loud pedal its the ECU raising oil pressure to advance timing rather than a mechanical engineering advancement or have i got this all arseways? :confused:

Just a general question when I have a few people reading this thread - do all direct injection engines use oil in normal use and are VAG engines different/better/worse in this respect?

Thank everyone for their info - much appreciated. :smiley: :happy2: :laugh:
Title: Re: Variable valve timing
Post by: Teutonic_Tamer on October 20, 2009, 07:55:31 pm: Quote from: veedubbubh on September 26, 2009, 07:49:42 pm
Ok interesting - so when I step on the loud pedal its the ECU raising oil pressure to advance timing rather than a mechanical engineering advancement or have i got this all arseways? :confused:

In a basic sence, that is correct!

Quote from: veedubbubh on September 26, 2009, 07:49:42 pm
Just a general question when I have a few people reading this thread - do all direct injection engines use oil in normal use and are VAG engines different/better/worse in this respect?

Any engine can consume oil if they are not correctly run in - so it isn't unique to VAG engines