VW engines - Variable valve timing?

[Jhoo]

I stumbled upon this in the net, not sure its old news. Only on the AGN 1.8 engine , it says variable valve timing. By any chance its a Vtec equivalent? I welcome any info about this. Thanks.

Pages from vw_g4_2.pdf

[Kanr]

i dont think so as it technology is from Germany,bro!!!please check out from the SE at lengkee road if u want to find out more,cheers!!!

[Jhoo]

I think A4/A3 1.8 may have the same engine with diff mounting, just doubtful that the SE at PA will entertain a SEAT..... thanks and cheers too

[Yeobh]

If I recall correctly VVTi original from Toyota

[Fortress]

Variable valves(generally means exhausts) was experimented by Ford, and first produced by Fiat in the 70s. The first mass produced car with VV was the Alfa Romeo 164s. Of course, it the "inventive" Japanese brought it to Civic and it is called Vtec..and also F1 Honda.

 

The Germans has both intake and outlet variable valves called Double Vanos in their BMW.

Edited October 7, 2005 by Fortress

[Fortress]

believe the first VVTi(patented named by Toyota) was BMW Double Vanos

[Fluffy]

you are right to say that VVTi original from Toyota, as it calls it "vvti",

 

whereas other car companies call it different names:

 

BMW - VANOS

FORD - VCT

Honda - Vtec

Nissan - VCT, VVL

Porsche - VarioCam

VW and other car companies - VVT (variable valve timing)

 

if you think Toyota developed it, wrong again.......

 

 

The first experimentation with variable valve timing and lift was performed by General Motors. GM was actually interested in throttling the intake valves in order to reduce emissions. This was done by minimizing the amount of lift at low load to keep the intake velocity higher, thereby atomizing the intake charge. GM encountered problems running at very low lift, and abandoned the project.

 

The first functional variable valve timing system, including variable lift, was developed at Fiat. Developed by Giovanni Torazza in the 1970s, the system used hydraulic pressure to vary the fulcrum of the cam followers. The hydraulic pressure changed according to engine speed and intake pressure. The typical opening variation was 37%.

 

The next big step was taken by Honda in the late 1980s and 90s, where Honda began by experimenting with variable valve lift. Pleased with the results, engineers took the knowledge and applied it to the B16A engine, fitted to the 1989 EF9 Honda Civic. From there it has been used in a variety of applications, from sport to utility, by many different auto makers.

 

want to know more?

http://en.wikipedia.org/wiki/Variable_valve_timing

http://www.autozine.org/technical_school/engine/vvt_1.htm

 

just because Toyota has a little Lamb with "VVTi" on it's back winning horses doesn't mean the other manufacturer's don't have this tech, it is just that they don't go around blowing their trumpets or put labels on little lambs.

 

there are other technologies like Variable Length Intake Manifold (VLIM) to get more power and better FC, such as the Twinport tech found in the Opel Ecotec 1.6 engine in the Opel Astra H. I know it gets about 15+km per litre

Edited October 7, 2005 by Fluffy

[Fortress]

Interesting, the information, because the Alfa 164 were out in 87 with Variable Valves, also the Ferrari are missing...

 

Guess, we need to be discerning in what were read too....

[Fluffy]

yup agreed

[Fluffy]

I stumbled upon this in the net, not sure its old news. Only on the AGN 1.8 engine , it says variable valve timing. By any chance its a Vtec equivalent? I welcome any info about this. Thanks.

 

time to go out and buy those "VVT" stickers and paste them below your left and right signal indicators - the ones just in front of the front doors, so that like Toyotas, the whole world will know your car has got Variable Valve Timing !

 

VVT stickers can add 10bhp too! (in addition to your Cupra R R !

[Jhoo]

...Finally, I've owned a V-whatever.....

 

About the stickers, I still prefer 20VT over 20v VVT.....

 

Maybe can fetch another $2K when selling, "This car got Vtec leh, see I show you..."