Topic: dry sump oiling

[James360]

Just out of curiosity one thing i liked about my K1 750 was the dry sump oiling do the 400 to 650 4s have dry sump oiling ?

[TwoTired]

No.  They are wet sump.

[mystic_1]

I'm curious, why you prefer dry sump systems?

mystic_1

[James360]

Down side to the dry sump they add more complexity and cost to the manufacture, on a wide transverse 4 cylinder production motorcycle there already to high in the frame with the crankshaft centerline almost always put above the axle centerline's, on a narrow engine like the old 60s triumphs dry sump makes the engine a little shorter can be lower in the frame crank centerline is below the axle centerline. There a huge advantage for cars with a smaller dia. bellhousing no deep sump the engine can be put a lot lower in the frame. If I had my choice to have a dry sump on a motorcycle ( there are some more reasons) I would take it, but I would not pass on any motorcycle just because it did not have a dry sump.

[strynboen]

is the differens in high så big,on 750 and 550,,think its almost same,,think that oil tank,vas a sales trick,,all other have oil tank,,så honda made it too..vhen sales goes on,,they droppt it..and rise oil levvel in engine

[James360]

harleys have had dry sumps since 1930s, triumph, BSA. nortons used them there have been others. they can be used to some advantage are they a must have to make an engine work absolutely not.

[strynboen]

i only have a 550,hov is 750,,is there a level mark om engine or is the tank the kontrol point,,is there 2 pumps,,a pressure pump..and a level /kolling/tank pump..sorry for asking,,i kut just looks in faq..but likes to here some good histories..from you

[Markcb750]

The primary advantage to a dry sump is that the crank shaft is not losing power pushing oil out of its way, particularly at high rpm this pumping (splashing ) loss can be significant.

It is more expensive,  wet sumps generally do not have an additional tank and my guess is that most wet sump systems have a single stage pump.  Less $$.

[mystic_1]

i only have a 550,hov is 750,,is there a level mark om engine or is the tank the kontrol point,,is there 2 pumps,,a pressure pump..and a level /kolling/tank pump..sorry for asking,,i kut just looks in faq..but likes to here some good histories..from you

Strynboen,

Yes, the 750 has two pumps, actually two pumps in the same housing sharing a common driven shaft.  One pump pulls oil from the tank and passes it to the main oil gallery, the other pump takes return oil from the sump pan and returns it to the tank.  Some of the return oil is also used to lubricate the transmission.  See pic below   Oil level is checked via a dipstick on the tank.

mystic_1

[strynboen]

yep exatly hvat i vas looking for..vill have a 750 somtime,,but first a 400 four,,like that littel smart thing