twin cam vw engines

[Dizzie]

someone explain to fielder why our 16v and 20v engines only have 1 cam pulley on the end.

[golfvr6]

The exhaust cam is driven by the sprocket via the cam belt, the inlet cam is driven via a chain that links to the back of the exhaust cam.
later vw polo 16v engines actually have 2 cam sprockets.

[golfvr6]

Here is an example
An Audi 20v engine,
The chain is at the sprocket end, on the 4 cylinder it will be on the other end on the cams.
The principle is still the same, one sprocket drives the exhaust cam, then a chain links both exhaust and inlet cams.



Hope that helps  

[Fielder5757]

LOL ok diz you win.........For now

[Dizzie]

too much time looking at Jap engines did that to you fielder

[kniterider]

heres a pic of my 20v four cylinder head, as you can also see the cambelt drives the exhaust cam, which is linked at the other end by a chain and sprocket to the inlet camshaft hence the 'sohc' lookwhen you see the belt just driving one pulley on the 'open side'



enjoy!!

lol

Gaz

oh yeah turn pic around 180 degrees and it would look like it did on the car!! lol

[Dizzie]

and it would be impossible to work 20 valves with only 1 cam

[Gambit]

and it would be impossible to work 20 valves with only 1 cam

i read somewhere that some engine manufacturer  where able to work 16v's with one cam

or somehting bizarre, ill try and dig it out

[Gambit]

honda crx esi & mazda mx3 are both 16v SOHC engines


and ford have a 2.0 8v twin cam!

[mk1]

And the Triumph dolomite sprint had a 16v engine and used one cam to operate the valves, and used the same cam lobe to open the inlet and exhaust valves .
Steve.