cb200 oil flow question - help a brother out!

Bert Jan

Holy Modification Batman
I'm rebuilding my gf's cb200 engine. I've read here and on other blogs that oil flow to the camshaft is a bit tricky.
My plan is to make an extra oil line from where the oil fillter sits to the both "cam-bearings".
On the non-ingnition side that won't be a problem, but on the ignition side it will be, due to obviously, the ignition parts.

When oil in the engine is sucked up by the pump and spit out at the other end, it goes directly (thru this 1mm hole between the crankcase and cilinder) to the head and cam. BUT, the oil gets to the other end of the engine as well, lubing the big-end bearing on the flywheel side.
I also noticed that the oil filter does not filter oil going to the head. Oil to the head goes from the pump directly to the head and there is a seperate oil path for the crankcase and such. Strange, cause the cam-bearings need clean oil so badly.

Long story short, my question is:

When i make an extra oil hose from the right cover oil line (remove the little pushed-in rod and fix a banjo) directly to the cam-covers (eliminating oil-problems due to gunk in the 1mm hole), will there be enough pressure left to oil the rest of the engine. The only reason i can think of why that hole is sooo redicilously tiny is to preserve oil pressure to get oil everywhere. When i make an oil line, the oil pressure drops. Will this cause trouble?

I want to do this mod because i think it's better than original and i'm competent to do it. And it will look sexy :)

Planning to do the mod a little like this, but than to the head and no retour line. Oil will go back via camshain.
cb200 engine is similar to the one (175cc) in the pic. The outside oil-line won't be needed.

the picture is being a pita, dunno why it wont embed. sorry.

<img>http://www.jrbranson.com/HondaRacer/CB175/pixs/Oil-system-cooler-installed-1.jpg</img>

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What JB has done with that bike is to insert a cooler between teh pump and the motor. Inside the cover, he has plugged the center of that oil feed tube to take oil out to the oil cooler and then he brings it back in to feed the system as if nothing had happened.

The design issue that Honda engineers faced is that cam bearings are plain bearings and need reasonable pressure but don't need a lot of flow. The crank is the opposite. Needle roller bearings that need high volume at low pressure. So they fitted a small restriction. I'd go with stock oiling system after you clean it all out, and change the oil at least once per quarter or each 1000 miles.
 
Well thanks man! Clear.

My only concern is that i got the covers blasted and don't want any sand get stuck in the little hole. And i know on forehand i can't clean the covers THAT good. Any tips on cleaning after blasting?
 
teazer said:
What JB has done with that bike is to insert a cooler between teh pump and the motor. Inside the cover, he has plugged the center of that oil feed tube to take oil out to the oil cooler and then he brings it back in to feed the system as if nothing had happened.

The design issue that Honda engineers faced is that cam bearings are plain bearings and need reasonable pressure but don't need a lot of flow. The crank is the opposite. Needle roller bearings that need high volume at low pressure. So they fitted a small restriction. I'd go with stock oiling system after you clean it all out, and change the oil at least once per quarter or each 1000 miles.
ok Teazer I am gonna listen to you again. Well that explains it. The stainless steel splash? Pads on the inside of valve cover? I would think a lot of oil would be slung by the timing chAin like a Dutch water windmill :) Bert and I are Dutch :)
 
Texasstar said:
ok Teazer I am gonna listen to you again. Well that explains it. The stainless steel splash? Pads on the inside of valve cover? I would think a lot of oil would be slung by the timing chAin like a Dutch water windmill :) Bert and I are Dutch :)

Hell yeah! It aint much if it aint Dutch!
 
The top cover incorporates the breather and an oil separation system of baffles. That's what's in the top cover.

No windmills, daffodils or coffee bars ;-)
 
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