Oil pickup idea

[Mick Day]

Thinking out loud. Is it possible to leave sump and oil pickup as is, remove the Rover oil pump rotor and use a sandwich plate (like on an apollo-setup) for scavenge and pressure in? Add a 1+1 stage dry sump pump and a tank and you have a dry sump setup.

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More thinking out load: what about using the existing internal pump & pickup as a scavenge pump, exit via the filter sandwich plate to dry-sump tank, new external Pace pressure pump then back in via the filter sandwich plate?

[Paul Ranson]

The standard oil pump probably won't work well as a scavenge pump.

 

I'd have thought Tor's idea was plausible but you're only saving the dry sump pan cost and adding complications like new pressure pump and possibly filter arrangement.

 

Paul

[Bricol]

Don't forget with the aircraft "clunk"tank ideas, the tank is normally under exhaust pressure, which helps with pick-up. There does seem to be a variation on the old style clunk with the 3G manouvres being attempted.

 

Must admit to not hearing any bad things about accusumps - anyone care to enlighten me?

 

Bri

[Colin Mill]

I have been scouting around on the web for useful info and pictures on the problem. The pictures on:-

http://www.our-nest.co.uk/Caterham/Diary/diary_dec03.htm

 

show the sump off situation quite well. Looking at the foam/windage tray picture:-

http://www.our-nest.co.uk/Caterham/Images/Diary/dec03-11-4.JPG

 

The purpose of the foam seems to be to impede the flow of oil back into the sump! (Especially if you contemplate 3 gallons/minute trying to get through there.)

 

Also the picture:-

http://www.our-nest.co.uk/Caterham/Images/Diary/dec03-11-1.jpg

seems to show the pickup is not central (sideways) in the sump judging by the distance from the pickup to the holes to the sump fixing bolts.

 

 

[Bricol]

With reference to the model aircraft "clunk" tanks, I saw exactly that yesterday.

 

Fitted into a sump pan from an AMC big-block. Attached to the side of the pan was an ali block - pivoting from the bottom of this was an arm with the oil pick up mesh on the bottom - as the pan was moved around, the arm swung freely - ie it would follow the forces acting on the oil and it and swing to the relevant side.

 

Looked a nice bit of kit - expensive tho. not quite sure how they got the pick-up to swing so freely, yet still be air tight.

 

 

Bri

[Colin Mill]

Hi Bri

 

I reckon a couple of sealed ball races could do the trick. SMB bearings do some really nice high aspect ratio ones that would take very little space - take a look at:-

 

http://www.smb-bearings.co.uk/Thinsect_cat.htm

 

Something like the 17 x 23 x 4 (6703-2RS) would be about right. Perhaps a bit smaller - do you know what the bore of the oil pickup pipe needs to be on a K series?

BTW these bearings are really low cost.

Colin