Author Topic: Is this a stupid question ?  (Read 1535 times)

Offline Frankie 2 sheds

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Is this a stupid question ?
« on: January 29, 2018, 03:25:36 PM »
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

Offline Trigger

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Re: Is this a stupid question ?
« Reply #1 on: January 29, 2018, 03:32:37 PM »
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  ;)

Offline hairygit

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Re: Is this a stupid question ?
« Reply #2 on: January 29, 2018, 03:33:32 PM »
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!
If it's got tits or wheels, it's hassle, if it's got both, RUN!!!

Offline Green1

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Re: Is this a stupid question ?
« Reply #3 on: January 29, 2018, 05:10:03 PM »
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?
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Offline Bryanj

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Re: Is this a stupid question ?
« Reply #4 on: January 29, 2018, 05:20:16 PM »
Mechanically worst idea ever

Offline Orcade-Ian

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Re: Is this a stupid question ?
« Reply #5 on: January 29, 2018, 05:39:26 PM »
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

Offline K2-K6

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Re: Is this a stupid question ?
« Reply #6 on: January 29, 2018, 06:43:46 PM »
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.

Offline K2-K6

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Re: Is this a stupid question ?
« Reply #7 on: January 29, 2018, 06:44:35 PM »
More built up example.

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Offline Frankie 2 sheds

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Re: Is this a stupid question ?
« Reply #8 on: January 30, 2018, 09:48:36 AM »
That Vincent idea looks very interesting K2 as the cb frame lends itself to that I believe. I'll investigate further... Thank you.....Frank

Offline Tomb

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Re: Is this a stupid question ?
« Reply #9 on: January 30, 2018, 10:49:24 AM »
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
Tom
'73 CB550 with CB500 engine café racer
'62 CB77 Sprinter
'70 CD175
'78 CB550 with sidecar
'80 Z50R
And a load of old Yamaha 1100's

Offline Tomb

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Re: Is this a stupid question ?
« Reply #10 on: January 30, 2018, 11:05:54 AM »


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.
Tom
'73 CB550 with CB500 engine café racer
'62 CB77 Sprinter
'70 CD175
'78 CB550 with sidecar
'80 Z50R
And a load of old Yamaha 1100's

Offline MrDavo

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Re: Is this a stupid question ?
« Reply #11 on: January 30, 2018, 11:19:09 AM »
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.  ;)
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Online Rozabikes Tim

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Re: Is this a stupid question ?
« Reply #12 on: January 30, 2018, 01:12:07 PM »
I have a Honda 650 Vigor (Dominator ish). Like many XL/ XR's oil in front frame tube.
One day I'll have the time to restore it, not just talk and dream....

Offline Green1

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Re: Is this a stupid question ?
« Reply #13 on: January 30, 2018, 05:58:44 PM »
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. 
Current bikes
Honda CB750k1 Valley Green Metallic
Honda CB750k1 Candy Gold
Honda CB550k Candy Jade Green
Honda CG125
Aprilia Pegaso 650
Moto guzzi 1200 sport
Kawasaki EX650R (Mine until dave pays for it)
Kawasaki ZXR400 J

 

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