Is this a stupid question ?

[Frankie 2 sheds]

Just completing the engine re-build on a cb750. The plan is to make the bike as naked as possible. With that in mind I want to get rid of the oil tank. Here's the stupid question....If I re- direct the flow of oil to the top of the engine and have a wet sump, what's the issues? (I did say it was a stupid question).......Frank

[Trigger]

The sump is not a sump as such, it is not deep enough to hold the amount of oil that the engine requires. You will have to fit this, not cheap >>>http://www.outsidersmotorcycles.com/product/sumpthing/?v=796834e7a283
Also the oil does go to the head 

[hairygit]

You would need a different oil pump, the standard on is fed by gravity from the tank, it only scavenges theexisting sump to return it to the tank. Really wouldn't recommend your plan!

[Green1]

The sump is not a sump as such, it is not deep enough to hold the amount of oil that the engine requires. You will have to fit this, not cheap >>>http://www.outsidersmotorcycles.com/product/sumpthing/?v=796834e7a283
Also the oil does go to the head 

I don't fancy filling the engine up through the tappet cover 
Surly it will take ages?

[Bryanj]

Mechanically worst idea ever

[Orcade-Ian]

Oil in frame like old Brit stuff? Not actually in the original frame tubes but a separate one.
If you are using a standard tank it would be more difficult to hide a tube - or perhaps you could put a compartment in the rear of a standard tank.  There must be a way!
Ian

[K2-K6]

Vincent oil tank design as part of a frame mod?

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My CBX 750 Honda uses the frame rails to get to and from the front mounted oil cooler.

[K2-K6]

More built up example.

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[Frankie 2 sheds]

That Vincent idea looks very interesting K2 as the cb frame lends itself to that I believe. I'll investigate further... Thank you.....Frank

[Tomb]

Triumph and BSA Oil-In-Frames used the top frame tube as the oil tank



A mate converted a Featherbed frame to this type of construction for a Vincent engine by welding in a large tube at the top of the frame like an Egli frame.

Here is an Egli CB750

[Tomb]

A large diameter could be welded in place of the original tube of the Honda frame. I would always consider this mod over an engine mod to make it wet sump.

[MrDavo]

I don't fancy filling the engine up through the tappet cover 

The oil in frame T140, pictured above, was literally that, as Triumph used an old 650 tappet cover with a dipstick attached. Oh the fun I had tring to get it in the frame and not all over it, particularly at 250 miles to the pint.

When the frame cracked around the swinging arm pivot, as a result of riding it flat out on the motorway chasing a Suzuki T500, the oil made a spectacular bid for freedom. That frame is still in a friend's Mum's attic, there is no truth in the rumour that I claimed on the insurance for a missing bike. 

[Rozabikes Tim]

I have a Honda 650 Vigor (Dominator ish). Like many XL/ XR's oil in front frame tube.

[Green1]

You just reminded me my Aprilia is oil in the front frame tube as well. You fill it up between the headstock and tank any faster then a dribble it goes over the tank and radiator. If your really messy the exhaust and front tyre as well.