-
Yeah, I always upped the oilpump settings on idle.
Remeber, if you are doinh 70 at 8k revs, and shut the throttle off, the only oil that that engine will get, will be what you showed me in thatvideo.
That is often how a lot of two strokes seize.
-
@Calum so I still can't use engine braking and still have to blip the throttle at coasting?
-
@Calum so I still can't use engine braking and still have to blip the throttle at coasting?
-
@declan if you want engine braking get a big four stroke single, my DR650 used to lock the back wheel
@finnerz89 my 140 does the same who need rear brakes lol
-
Theres way more oil flowing at 8000rpm engine braking, than at idle, because of the vacuum.
I still wouldnt enginebrake, its just good practise to pull the clutch and rev the bike occasionally.
-
Theres way more oil flowing at 8000rpm engine braking, than at idle, because of the vacuum.
I still wouldnt enginebrake, its just good practise to pull the clutch and rev the bike occasionally.
-
@Jens-Eskildsen Absolutely, HOWEVER. The throttle is shut OFF. Therefore there won't be the same vacuum pressure.
-
When I fitted a clear hose on my oilpump, i tested how much oil was pumped at high revs, with throttle shut (engine braking) the oilpump was kept open until the revs dropped, and plenty of oil was being pumped out. Kinda the same happens when you blip the throttle, just to a lesser extent, in that the rpms drop faster.
I have no background to say weather or not the difference in vacuum with throttle on and off is significant, so im going to trust you on that one. With premix you shut of both the gas and thereby the oilsupply when you enginebrake, so I guess the problem is even bigger when running premix, compared to having the oilpump.
But I think we all agree that its good practise to pull the clutch instead of coasting.
-
When I fitted a clear hose on my oilpump, i tested how much oil was pumped at high revs, with throttle shut (engine braking) the oilpump was kept open until the revs dropped, and plenty of oil was being pumped out. Kinda the same happens when you blip the throttle, just to a lesser extent, in that the rpms drop faster.
I have no background to say weather or not the difference in vacuum with throttle on and off is significant, so im going to trust you on that one. With premix you shut of both the gas and thereby the oilsupply when you enginebrake, so I guess the problem is even bigger when running premix, compared to having the oilpump.
But I think we all agree that its good practise to pull the clutch instead of coasting.
@Jens-Eskildsen agreed
-
When I fitted a clear hose on my oilpump, i tested how much oil was pumped at high revs, with throttle shut (engine braking) the oilpump was kept open until the revs dropped, and plenty of oil was being pumped out. Kinda the same happens when you blip the throttle, just to a lesser extent, in that the rpms drop faster.
I have no background to say weather or not the difference in vacuum with throttle on and off is significant, so im going to trust you on that one. With premix you shut of both the gas and thereby the oilsupply when you enginebrake, so I guess the problem is even bigger when running premix, compared to having the oilpump.
But I think we all agree that its good practise to pull the clutch instead of coasting.
@Jens-Eskildsen It would make sense for the pump to be designed that way.
The oil pump is controlled by two elements, indirectly from the primary shaft, and by the cable.
However, if you look at the pressure at the crankcase using a vacuum gauge, I'm sure you'd see negative air pressure.
Since my car has a vacuum gauge, I know when my foot is off the throttle I see like -0.8bar.
