Digsy Posted May 26, 2002 Share Posted May 26, 2002 Since there was a bit of interest generated over piston slap in Dil's the cambelt change thread, here is a new one in which we can further investigate the phenomenon. I've attached a quick sketch showing how the piston side load reverses during the power and exhaust strokes on a four-stroke engine. I'm pretty sure that piston slap has something to do with this, coupled with - as Myles said - the piston not fitting the bore properly intil it has expanded slightly. Link to comment Share on other sites More sharing options...
Digsy Posted May 26, 2002 Author Share Posted May 26, 2002 ...and here it is for the induction and compression strokes. Spot the deliberate mistake. I've reversed the symobols for the compressive and tensile loads in the connecting rod. DOH! Never mind... Link to comment Share on other sites More sharing options...
Digsy Posted May 26, 2002 Author Share Posted May 26, 2002 And these sketches are my attempt to show how piston pin offset transfers the side thrust to the cylinder wall before the piston reaches TCD. Hopefully on Monday I'll be able to tie all this together with a proper explanation! Link to comment Share on other sites More sharing options...
Myles Posted May 26, 2002 Share Posted May 26, 2002 Blimey M8 , you've been busy ...I've bin in the pub! thanks for distracting peope from that questionable area I got myself into ....you know , about whether or not the mkiv has forged pistons ....OOPS! Link to comment Share on other sites More sharing options...
Digsy Posted May 26, 2002 Author Share Posted May 26, 2002 Here's the last piece of the puzzle, which was sitting in a book over my shoulder the whole time (Introduction to Internal Combustion Engines - Richard Stone). Link to comment Share on other sites More sharing options...
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