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  #1  
Old 9th December 2019
Scott Scott is offline
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Default More oil return questions

The recent thread on oil return from heads made me question my plans for my own project. I've posted photos of it here before - I've a late 1981 ironhead bottom end with the deck redrilled to accept XR pattern studs. On top of that are custom made aluminum cylinders with XR1000 dimensions. Genuine XR heads are on top of those, with homemade (not by me) rocker boxes on the top. The photo below describes it better than I can.

I plan to plumb oil to the rocker boxes using the standard IH ports between nos. two and three tappet blocks. The XR heads have external drains. See photo with my finger pointing to the drain. I don't know the best place to drain the heads to. The XR1000 cases are different than my late '81, so that's not a great guide. Can I drill a hole in the right case into the cam chest, thread it for 1/8" pipe, screw in a hose barb, and dump the oil in through that? If so, is there a physical spot on the case that's most ideal? I also briefly considered drill holes in the very bases of the cylinders and returning oil in through those. I should note that this bike is going to be a vintage road racer. I may return it to the street at some point. That seems far off into the future right now. Any input is greatly appreciated.



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  #2  
Old 9th December 2019
Scott Scott is offline
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Just to complicate things, I don't have an oil slinger. As this is a race bike, it won't have a generator - just a round 1/8" aluminum plate to cover the generator hole. Without a generator shaft, there aren't a lot of places to put the oil slinger.
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Old 12th December 2019
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i'm impressed someone was able to build those rocker boxes from scratch.
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Old 13th December 2019
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I'd drain the oil into your gen block off plate. Then you don't have to punch any holes in the cases.
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Old 13th December 2019
needspeed needspeed is offline
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Unless an '81 has had a pump upgrade, all oil in the engine has to go to the sump below the flywheels before it can be sucked into the return gears. For a race engine it seems like a good choice to plumb the drains into the sump area and under some sort of windage tray.
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Old 13th December 2019
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Quote:
Originally Posted by needspeed View Post
Unless an '81 has had a pump upgrade, all oil in the engine has to go to the sump below the flywheels before it can be sucked into the return gears. For a race engine it seems like a good choice to plumb the drains into the sump area and under some sort of windage tray.
This is exactly what I ended up doing. I was going to do what Ryder Rick suggested, but I always want to keep open the possibility of returning this thing to the street sometime in the future, for when I get too broke or broken to race. A generator would be needed, and I'd have to find a new place to drain that line. A few photos follow; first is where I put the drain. I just sent the second photo to brucstoudt, and I should have posted it here as well. The second photo is a scan of the cover of the April 2010 cover of the Motorcyclists Post. The engine was built by a retired construction worker named Eddie (who I bought it from), who did wonders with not very much. I'm using just the heads and rocker boxes from that engine, but I have most of the rest of it in my garage in pieces, slowly oxidizing away. You have to see the appreciate the third (current day) photo to see how much work he did to the 1968 XLCH cases. The deck is raised about two inches and drilled for XR pattern studs, while the cylinders are completely homemade. He removed the transmission and had the engine fitted to a BT five speed.





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Old 13th December 2019
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interesting motor for sure.i'm curious about the hose coming from the top of the cam chest near where a tach drive would be located in the nose cone timing cover.i can see both hoses to and from the aftermarket oil filter.the other would be a vent line?? it already has the conventional one below the generator.needspeed?
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Old 14th December 2019
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Hi Scott,

... Tall decks indeed!!!!

The post 77 cases are known to run very dry in the timing case cause obviously, the return oil don't collect there any more.
A fact recognised by HD which went to the extent of installing an oil manifold inside the case to bring oil on top of the cams.

On some of my strockers engines in the past, where the internal drain from rocker boxes is a pain and is piped outside, I have routed them to two fittings fitted in the middle of each set of tappet blocks.

Then, plenty of oil is now in the timing cover and drain to the crank via the normal HD drain holes.

And you can build yourself an oil slinger by using shortened shaft and two generator ends face to face, works for me...



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Old 14th December 2019
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a generator with no armature.good thinking Patrick.
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Old 14th December 2019
Scott Scott is offline
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Thanks Patrick. That's a really, really good idea. Are those front engine mounts aluminum? Did you make them yourself or are they available somewhere?
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