i need to boost oil pressure at operating temp.

i have looked at Penrite HPR 40 25w-70 and i think it is a non synthetic / full mineral oil but can't tell for sure.

anyone know for sure? or of an alternative high viscosity oil?

currently running Pennzoil non synthetic 25w-60

Mate just changing the grade of oil is not going to stop the oi; pressure problem if it is low, you already are running a higher grade then normal and by increasing the grade is making the oil to heavy for the syncro's in the gerabox to work properly, what oil pressure are you running now

penrite started using a lesser base oil a couple of years back and started adding friction modifiers to make up for it so it is not a good oil for old worn engines

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

at operating temp it's running about 40 -50 at the moment. it's only a little bit extra i am looking for. my engine would be no worse than plenty of others i have seen in terms of oil pressure.

Try Castrol Edge Sport 25W/50, or KMart's KMX 20W/50.
I get 70psi hot with both.

I found Penrite HPR30 and 40 both lost pressure when real hot.
50psi is OK at revs, hot, if less though the motor probably needs bearings/crank grind and/or a new oil pump.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

If you go to high a viscosity you'll get clutch drag caused by the primary gear sticking to the crank shaft. Put some Wynns Stop Smoke in there if you want to see what happens.

Tim

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1951 Morris Commercial J Type Van
1955 BSA C11G
1961 Morris Mini Traveller
1969 Triumph TR6R
1977 Leyland Moke Californian

Been there done that, one night we put Penrite 40W/70 in my son's oil burner Clubby and we couldn't get gears..
Of course he just HAD to go out immediately, the old hot date excuse... so I drained a litre or so out and replaced it with diesel fuel. Motor needed a cleanout anyway.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I worry about you sometimes Doc

I hope you flushed out the concoction soon after the hot date

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"Show me the Mini!"

Left it in for a week...
Changed it again with 20W/50, but shortly after the car had a headon on Peter Meadows Rd near Kentlyn. It's now gone to the big graveyard in China (steelworks).

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

So if i wanted to clean the inside of my motor how much diesel should i use in how much oil?

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I don't recommend using diesel or flushing oils as they can dislodge crud, which could then find its way into places you don't want. Like bearings...
I only did this coz I had no other quick option on a Friday night.

If the oil is black and crappy, just buy 2 cans of cheapo 20W50, do a couple of oilchanges at 500 mile intervals and then toss the filter for a new one. And new oil...
KMart's KMX 20W/50 is hard to beat, IMO.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

check into the 9/16 ball bearing oil pressure relief valve mod

http://www.ausmini.com/forums/viewtopic.php?t=46507&highlight=ball

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did I tell you that I won a trophy?

It was only a thought as NAV's engine has been sitting for a bit with old oil in it. I've only used Castrol GTX2 since it's rebuild as a well known mini builder recomended it to me and he swears by it.

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i was reading castrols books today at work, and they recommend gtx original for older minis, gtx2 is used for post 1990's cars, same viscosity, yet gtx pre 1990, gtx2 post 1990.

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'73 clubby s "cryo" - sold
Operation Evil Sesame Street!