Are dodgy air filters common !!!
I had a cheap Hi-Flo filter that i felt wasn't letting enough air through.And it wasn't until i replaced it for a K&N that i realised how ill fitting it was too in comparison.It rattled about by a good 5mm whereas the K&N was a very snug fit.
Quote from: darrsi on 07 July 2013, 10:02:11 pmI had a cheap Hi-Flo filter that i felt wasn't letting enough air through.And it wasn't until i replaced it for a K&N that i realised how ill fitting it was too in comparison.It rattled about by a good 5mm whereas the K&N was a very snug fit.What symptoms did you get? I have one of those filters but have always had a hesitation when opening it up.
when i changed my oil the bike ran shite between 4-8k, there was no power.dropped it so it was 1mm above the lowest point on the sight gauge and it was like having my bike back but better.
Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil
Quote from: His Dudeness on 08 July 2013, 09:49:32 pmCan anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil Something to do with pressurising the crankcase?
Just read a couple of articles on this, interesting, but not sure conclusive in this case. One result of too much oil is that you wind up with bearings/crankshaft sitting in oil, creating excess drag, thus reducing performance. However, all those moving parts sitting directly in the oil churn it up and cause it to foam. This reduces lubricating quality, actually decreases oil pressure, with resulting carnage. Horror stories of broken con rods, holed cases, spark plugs blown out etc! Surprised nothing blew out of the breather pipe tho'.
Quote from: nick crisp on 12 July 2013, 09:56:24 pmJust read a couple of articles on this, interesting, but not sure conclusive in this case. One result of too much oil is that you wind up with bearings/crankshaft sitting in oil, creating excess drag, thus reducing performance. However, all those moving parts sitting directly in the oil churn it up and cause it to foam. This reduces lubricating quality, actually decreases oil pressure, with resulting carnage. Horror stories of broken con rods, holed cases, spark plugs blown out etc! Surprised nothing blew out of the breather pipe tho'.Interesting stuff. I don't know enough about how the oil circulates to understand what happens when too much is put in but I know you can wreck an engine with too much oil and I could see how you could have a drop in the power that it's putting out but you'd think it would effect the whole rpm range rather than between 8-10k or 4-6k. The circulation of oil is definitely something to look into though. An interesting area indeed!
Quote from: His Dudeness on 12 July 2013, 10:36:01 pmQuote from: nick crisp on 12 July 2013, 09:56:24 pmJust read a couple of articles on this, interesting, but not sure conclusive in this case. One result of too much oil is that you wind up with bearings/crankshaft sitting in oil, creating excess drag, thus reducing performance. However, all those moving parts sitting directly in the oil churn it up and cause it to foam. This reduces lubricating quality, actually decreases oil pressure, with resulting carnage. Horror stories of broken con rods, holed cases, spark plugs blown out etc! Surprised nothing blew out of the breather pipe tho'.Interesting stuff. I don't know enough about how the oil circulates to understand what happens when too much is put in but I know you can wreck an engine with too much oil and I could see how you could have a drop in the power that it's putting out but you'd think it would effect the whole rpm range rather than between 8-10k or 4-6k. The circulation of oil is definitely something to look into though. An interesting area indeed!A shot in the dark: Perhaps at lower revs, the drag is too minimal to create a noticeable difference. As revs increase, (speed of moving parts) so does drag coefficient, so performance loss is more noticeable. If you check back on this thread, Fizzy Pies doesn't say anything about problems at low revs when his was overfilled. Littlejohnos bogged higher up the rev range. Fazerlads initial post said it bogged when he tried to accelerate hard. All fit in with this idea. Of course, it could be complete b*****ks!
Quote from: nick crisp on 12 July 2013, 09:05:35 pmQuote from: His Dudeness on 08 July 2013, 09:49:32 pmCan anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil Something to do with pressurising the crankcase?Maybe. You can't argue with results but I don't understand it