Author Topic: Another sludge trap warning  (Read 863 times)

Online RDfella

  • Resident Legend
  • *****
  • Join Date: Aug 2017
  • Posts: 547
  • Karma: 5
Re: Another sludge trap warning
« Reply #15 on: 17.01. 2019 09:51 »
Swarfy - you are right. Back in the day, engines used non-detergent oils: for engines little or no filtration, an  oil that dumps out the muck as a deposit is actually the best choice. I've seen engines wrecked by people who wrongly decide that their engine will be better running on a modern oil. Why? Because modern detergent oils hold the muck and products of combustion in suspension to be taken out by the oil filter but, without an oil filter (such as our bikes) this oil keeps circulating as a grinding paste
You should use the oil the engine was designed for and just be aware of the places where sludge is likely to settle. For example, my Riley car, despite having a full-flow oil filter, is supposed to have the sump dropped every 10,000m to clear sludge. In our case, the problem is the crank acting as a centrifuge - a mechanism used on some cars as an actual oil filter - think it was some Renaults which had a centrifuge built into the crank pulley especially designed to filter out solids from the oil.
Sun's shining here today at last, so must get on with some outside work.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Online Black Sheep

  • Resident Legend
  • *****
  • Join Date: Apr 2017
  • Posts: 599
  • Karma: 6
    • Where black sheep live
Re: Another sludge trap warning
« Reply #16 on: 17.01. 2019 10:05 »
Don't try the parrafin trick with a diesel. My mate did this with his old Land Rover. When he tried to stop it, it wouldn't. Paraffin was being drawn down the worn valve guides and being burnt. It just went faster and faster until the inevitable explosion. Oops! 
2 twins, 2 singles, lots of sheep

Online RDfella

  • Resident Legend
  • *****
  • Join Date: Aug 2017
  • Posts: 547
  • Karma: 5
Re: Another sludge trap warning
« Reply #17 on: 17.01. 2019 17:11 »
Black Sheep - I wouldn't recommend it for any engine. Although an oil, paraffin is actually a pretty poor lubricator and you risk scuffing plain beaings by using it as a flushing oil.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline Triton Thrasher

  • Scotland
  • Wise & Enlightened
  • *
  • Join Date: Feb 2009
  • Posts: 1449
  • Karma: 20
Re: Another sludge trap warning
« Reply #18 on: 17.01. 2019 18:01 »
The price of paraffin nowadays that would be an expensive oil change.   *eek*

ELLIS

Number 2 kerosene sold as heating oil.
Last 20 litres I bought was 60 pence per litre.

But don’t flush running engines with it- that would be silly.