1999 Fazer 600 surging power

[littlejohno]

I dropped 3.5 litres out of mine to take it to the Max I'd say there main issues for to much oil are blowing seals the risk of hydraulicking and possibly breathing so heavy it ruins on oil.
Luckily mine seems ok except the bogging fault

[nick crisp]

[quote author=nick crisp link=topic=8716.msg87390#msg87390 date=1373662584]
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'.

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]
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!

[His Dudeness]

[quote author=His Dudeness link=topic=8716.msg87395#msg87395 date=1373664961]
[quote author=nick crisp link=topic=8716.msg87390#msg87390 date=1373662584]
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'.

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]
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]

I don't know could be right could be a load of horse manure  :lol Are there any fluid mechanics experts on foc-u? :lol

[JoeRock]

I would imagine that the higher the bike is revving, the more churned up and then frothy the oil gets?
Only thing I can think of!

[fazerlad100]

I don't understand it either just glad it's working again but I wish i'd tried one thing at a time rather than the both together then I would have known which one cured the problem. I suspect it was the oil though.

[quote author=nick crisp link=topic=8716.msg87382#msg87382 date=1373659535]
[quote author=His Dudeness link=topic=8716.msg86594#msg86594 date=1373316572]
Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil  :lol

Something to do with pressurising the crankcase?
[/quote]

Maybe. You can't argue with results but I don't understand it
[/quote]

[fazerlad100]

I hadn't overfilled it by much. I only dropped out about 150mls. I just loosened the drain plug enough for it to drain slowly and watched the level on the window drop until correct level.

[nick crisp]

Well I can't get any further with the oil- overfill reason for performance loss (before engine destruction point, anyway). :wall  Dudeness, I think you're right, we need an expert if we want to know more.