skeggyrik 3 Posted November 14, 2007 When they balance the bottom the end of an engine how do they do it? Share this post Link to post Share on other sites
Sandy 191 Posted November 14, 2007 Piston weights are matched as precisely as possible, same for the rods, but the rods are also end over end balanced too to equal out their inertia at each end as much as possible and the flywheel and crank are rotated on a special balancing machine to find where off axis imbalances exist and then they are ground or drilled to remove the excess weight and find balance. Share this post Link to post Share on other sites
skeggyrik 3 Posted November 14, 2007 superb answer. Thanks Share this post Link to post Share on other sites
engine killer 6 Posted November 15, 2007 Piston weights are matched as precisely as possible, same for the rods, but the rods are also end over end balanced too to equal out their inertia at each end as much as possible and the flywheel and crank are rotated on a special balancing machine to find where off axis imbalances exist and then they are ground or drilled to remove the excess weight and find balance. After I blew my previous 8v, I had it all balanced during rebuilt as you mentioned here. The engine performance difference is huge. The engine rev much more happier than before and quieter. And the high rev went even smoother and willing to rev a little bit more especially in 4th and 5th. I cannot comment on my current Mi because when I haven't tried it before, but I highly recommend if you are rebuilding you engine, DO BALANCE it. Share this post Link to post Share on other sites
skeggyrik 3 Posted January 8, 2008 Just coming back to this. When they take the weight out of the pistons, where do they usually take it from? Share this post Link to post Share on other sites
Sandy 191 Posted January 8, 2008 The non-critical areas inside the piston, common sense prevails! Share this post Link to post Share on other sites
osama 0 Posted January 8, 2008 how much would this process cost to be done? sounds like it would tidy up the internals! Share this post Link to post Share on other sites
Sandy 191 Posted January 8, 2008 Depends entirely who you take it to! Best to find someone local/reputable, because sending parts like that is tricky with packaging. Share this post Link to post Share on other sites
Miles 331 1 Cars Posted January 8, 2008 I always use my mate Steve at http://www.vibrationfree.co.uk/, have a read of his site as it will take a while Share this post Link to post Share on other sites
McPikie 0 Posted January 9, 2008 Think my mate paid around £400 all in for crank, fly, rods and pistons for his RS Turbo Share this post Link to post Share on other sites
Alan_M 66 1 Cars Posted January 11, 2008 Think my mate paid around £400 all in for crank, fly, rods and pistons for his RS Turbo I paid less than a quarter of that for my Mi16, for all the above and harmonic damper. Share this post Link to post Share on other sites
Sandy 191 Posted January 11, 2008 There you go, that's how much prices can vary! Share this post Link to post Share on other sites
nick 3 Posted January 11, 2008 Don't forget the clutch cover! Nick Share this post Link to post Share on other sites
Alan_M 66 1 Cars Posted January 11, 2008 Don't forget the clutch cover! Nick Yep, and that. I seem to recall they also wanted all the bolts that would be used too! Share this post Link to post Share on other sites
nick 3 Posted January 11, 2008 Autosprint in Birmingham do it, I had a Pinto done years ago and was well happy with it. Nick Share this post Link to post Share on other sites
max0 5 Posted January 11, 2008 ive got a 8v engine in bits and might weigh it all to find how much difference there is in each piston/rods (with todays engineering you would have thought they would all be the same) When I was a nipper my had explained it as trying to run with a trainer on one foot and a walking boot on the other Share this post Link to post Share on other sites
