blackpug Posted March 28, 2007 Report Share Posted March 28, 2007 Apart from cc's, what are the differences between these engines? ie Are many of the components shared? cheers. Link to comment Share on other sites More sharing options...
Luke Posted March 28, 2007 Report Share Posted March 28, 2007 [ QUOTE ] Apart from cc's, what are the differences between these engines? ie Are many of the components shared? cheers. [/ QUOTE ] The 2.8 engine is a torque split engine with 25% up cam valve lifters. It also has skim pistons and a trail-scale dialogue crank. Link to comment Share on other sites More sharing options...
mb Posted March 28, 2007 Report Share Posted March 28, 2007 However the 3.2 can make the Kessel run in less than twelve parsecs Link to comment Share on other sites More sharing options...
AGK512 Posted March 28, 2007 Report Share Posted March 28, 2007 If Han Solo recons it can it must be true ! Link to comment Share on other sites More sharing options...
archway Posted March 29, 2007 Report Share Posted March 29, 2007 Technically I would have to look in the manual although certainly a higher compression ratio in the 3.2. To drive they are chalk and cheese (almost) - I have had both. Lots more low grunt with the 3.2 and much more fun than 0.4 litres would lead you to suppose. BTW, a parsec is a distance, not a time...... Link to comment Share on other sites More sharing options...
robin09 Posted March 29, 2007 Report Share Posted March 29, 2007 [ QUOTE ] Technically I would have to look in the manual although certainly a higher compression ratio in the 3.2. To drive they are chalk and cheese (almost) - I have had both. Lots more low grunt with the 3.2 and much more fun than 0.4 litres would lead you to suppose. BTW, a parsec is a distance, not a time...... [/ QUOTE ] Link to comment Share on other sites More sharing options...
Mook Posted March 29, 2007 Report Share Posted March 29, 2007 Compression ratio, cc's and electronically controlled variable valve timing are the main differences Link to comment Share on other sites More sharing options...
Tumbletop Posted March 29, 2007 Report Share Posted March 29, 2007 [ QUOTE ] Compression ratio, cc's and electronically controlled variable valve timing are the main differences [/ QUOTE ] How does the valve timeing get adjusted on the 3.2? I've often wondered how on earth an engine manufacturer manages to adjust what is seemingly a solid lump of metal (the cam shaft). Link to comment Share on other sites More sharing options...
mb Posted March 29, 2007 Report Share Posted March 29, 2007 I know the Honda VTEC engines use oil pressure to lock a 2nd profile onto the cam, but I think the VW is infinitely variable so assume it uses oil pressure to "re-profile" the cam to suit engine conditions. Link to comment Share on other sites More sharing options...
R32Ash Posted March 29, 2007 Report Share Posted March 29, 2007 [ QUOTE ] [ QUOTE ] Compression ratio, cc's and electronically controlled variable valve timing are the main differences [/ QUOTE ] How does the valve timeing get adjusted on the 3.2? I've often wondered how on earth an engine manufacturer manages to adjust what is seemingly a solid lump of metal (the cam shaft). [/ QUOTE ] It's done by oil pressure. In very basic terms, there are two inter-meshed rotors in a 'hub' at the ends of the camshafts - one rotor is attached to the camshaft, one to the sprocket. There are spaces between the teeth of these rotors which means they can move in relation to each other (thereby changing the cam timing). Oil is pumped into the spaces to force the camshaft to move relative to the cam sprocket. Link to comment Share on other sites More sharing options...
Tumbletop Posted March 29, 2007 Report Share Posted March 29, 2007 Wow thanks R32Ash, that was one of my big "must find out before I kick the bucket" life tasks! It must make profiling the cam extremely difficult, as the cam lobes would actually be a different profile at each side (if I'd understood the diagram correctly). I'd assumed the whole camshaft just lifted up or down, increased the time the vales were open for. Link to comment Share on other sites More sharing options...
Gti_Fly Posted March 29, 2007 Report Share Posted March 29, 2007 I didn't think the R32 had variable valve timing of any sort.. and it just had a variable inlet tract only. You can see the variable inlet tract mechanism on the front side of the engine. Link to comment Share on other sites More sharing options...
R32Ash Posted March 30, 2007 Report Share Posted March 30, 2007 [ QUOTE ] I didn't think the R32 had variable valve timing of any sort.. and it just had a variable inlet tract only. You can see the variable inlet tract mechanism on the front side of the engine. [/ QUOTE ] It has both. I'll see if I can find some more pictures of how the whole system works. Link to comment Share on other sites More sharing options...
R32Ash Posted March 30, 2007 Report Share Posted March 30, 2007 I found some more images - these are from the 3.2 TT, but it's basically the same motor. You can see the valves which direct the oil in this pic: Link to comment Share on other sites More sharing options...
R32Ash Posted March 30, 2007 Report Share Posted March 30, 2007 And this is the oil circuit itself: Link to comment Share on other sites More sharing options...
Tonsko Posted March 30, 2007 Report Share Posted March 30, 2007 Jesus wept that's complicated! So does that mean it's more important than ever to keep the oil fresh and clean? Link to comment Share on other sites More sharing options...
BrakeSnake Posted March 30, 2007 Report Share Posted March 30, 2007 Link to comment Share on other sites More sharing options...
blackpug Posted March 30, 2007 Author Report Share Posted March 30, 2007 So are they similar then? Link to comment Share on other sites More sharing options...
Mook Posted March 31, 2007 Report Share Posted March 31, 2007 Yes, they're both 15 degree V6 engines and share some common mechanicals. Link to comment Share on other sites More sharing options...
graeme86 Posted April 2, 2007 Report Share Posted April 2, 2007 [ QUOTE ] I didn't think the R32 had variable valve timing of any sort.. [/ QUOTE ] Vw just don't plaster badges on every conceivable spare external panel to tell the world Link to comment Share on other sites More sharing options...
mb Posted April 2, 2007 Report Share Posted April 2, 2007 Hi Graeme, Did you ever get your mirrors folding ? Link to comment Share on other sites More sharing options...
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