Oil capacity 4ltr chim
Discussion
Cheers,
Out of interest Chimp on Gas, does your engine oil look cleaner at the end of it's cycle using LPG.
My Jag on LPG oil looked like new even after 5000 miles
Petrol the oil was black, less deposits in the oil it seemed to me on LPG !
I concluded as it fires at about 20 deg highter I was getting a more complete burn
As you know all things LPG Dave does that sound plausible to you?
Regards Alun
Out of interest Chimp on Gas, does your engine oil look cleaner at the end of it's cycle using LPG.
My Jag on LPG oil looked like new even after 5000 miles
Petrol the oil was black, less deposits in the oil it seemed to me on LPG !
I concluded as it fires at about 20 deg highter I was getting a more complete burn
As you know all things LPG Dave does that sound plausible to you?
Regards Alun
ClassiChimi said:
Cheers,
Out of interest Chimp on Gas, does your engine oil look cleaner at the end of it's cycle using LPG.
My Jag on LPG oil looked like new even after 5000 miles
Petrol the oil was black, less deposits in the oil it seemed to me on LPG !
I concluded as it fires at about 20 deg highter I was getting a more complete burn
As you know all things LPG Dave does that sound plausible to you?
Regards Alun
The reson engine oil goes from golden brown to black is because one of it's jobs is to trap carbon and hold it in suspension, the black you see is just carbon from the combustion process. In the case of an internal combustion engine the carbon is soot particles which are a by product of incomplete combustion.Out of interest Chimp on Gas, does your engine oil look cleaner at the end of it's cycle using LPG.
My Jag on LPG oil looked like new even after 5000 miles
Petrol the oil was black, less deposits in the oil it seemed to me on LPG !
I concluded as it fires at about 20 deg highter I was getting a more complete burn
As you know all things LPG Dave does that sound plausible to you?
Regards Alun
As you know if you run a rich mixture your plugs will show soot, this is because there's too much fuel in relation to the available air to burn the fuel completely so the percentage of carbon left goes through the roof.
Some of that carbon will also end up suspended in the oil, when you see your oil go from golden brown to black what you're witnessing is the oil doing one of it's jobs ie keeping your engine internals free from carbon build up.
Now lets look at what my engine oil looks like after 3,500 miles on LPG, and at 5,000 miles it's still virtually unchanged from this golden brown.
The reason it stays so clean is all down to the clean burning nature of LPG.
Petrol & LPG are both hydrocarbons, a hydrocarbon is any fuel that is made up of hydrogen and carbon, what makes LPG so clean burning is it has one less carbon molecule (3 vs 4).
The simpler molecular structure of LPG will burn more completely in an engine because the oxygen present in the air can bond with it easier, that means less carbon monoxide, soot, and unburned hydrocarbons come out the tailpipe.
Even when you burn petrol at the right air fuel ratio (stoichiometrically correct 14.7 parts air to 1 part petrol) the burn is very poor and will inevitably produce carbon particles in the form of soot.
The massive reduction in soot when burning LPG means your oil stays cleaner for longer as do your engine internals.
This low carbon burn is a very good thing for engine life as carbon will eventually narrow your oil galleries like cholesterol narrows your arteries.
Carbon will also build up in your oil control rings rendering them less & less effective thus further increasing oil consumption. This oil finds it's way into the combustion chamber where it's burnt causing yet more carbon which in turn gums up the piston rings even more.
Carbon deposits also accumulate on the back of the poppet valves in your engine restricting air flow into your engine which can eventually lead to rich mixtures and yet again more carbon. In extreme cases carbon deposits hanging off the back of the valve can retain enough heat from the previous burn to initiate combustion so causing the devastatingly destructive auto ignition condition known as detonation (pinking).
Carbon in your engine is bad, the correct air fuel ratio is important but frequent oil changes are essential to remove the suspended carbon and start the cleaning process again with fresh oil.
However, carbon collection is just one reason why you change your oil. The lubricating function of your oil also degrades over time irrespective of the amount of carbon it's holding, this breakdown is caused by shear loads and high temperatures.
Over time the oils molecular structure will become broken down, you cant see this by looking at your dipstick, how black the oil is tells you nothing about it's molecular condition.
So you see, while LPG is a fuel that produces very low levels of carbon which is a very good thing for engine longevity, the oil still gets broken down so still needs changing regularly.
Just less regularly on LPG than if you run your car on petrol
ClassiChimi said:
So LPG de cokes the engine too?
Yes, it will indeed de-coke an engine that's been running on petrol, and it does a very effective job of it too.Just look at the latest breed of de-coking treatments available, no not a magic potion in a bottle but pure hydrogen. The process works by isolating the fuel supply from the engine and replacing it with pure hydrogen which cleans the engine as it's burnt.
Hydrogen is the cleanest burning fuel known to man, much cleaner burning than LPG even. Think of pure hydrogen is a hydrocarbon with no carbon molecule at all; so no carbon = no soot left after combustion.
If you run an engine on hydrogen all you get out of the back is pure H2O, so pure in fact you can drink it.
Most internal combustion engines are very happy to burn hydrogen, just as they are happy to burn LPG. By forcing the engine to run on super clean burning hydrogen you can complete a very effective de-coke.
Read about hydrogen engine cleaning in the link below, it is not snake oil because it's based on fuel chemistry and scientific fact.
http://keipertech.com/hydrogen-products/hydrogen-e...
Or just run your engine on LPG for a few hundred miles and you'll enjoy an equal engine cleaning effect to running on hydrogen for 30 minutes or so.
If I could buy hydrogen as easily and cheaply as I can LPG 'Ol Gasbag' would be burning that, no question!
Gas is Good
nigegas said:
What's the correct oil capacity for 4ltr chim is it 5ltrs ?
Back on topic, I recommend the OP buys 10 litres of engine oil.Your first fill of new oil will be anywhere from 5.5 litres to 6.3 litres depending the the filter size you're using and how complete your drain was in the first place.
You'll naturally burn most of the remaining oil before you reach your next oil change, so buying two 5 litre packs makes perfect sense.
I can recommend Penrite HPR15 which is a fully synthetic 15W60 with the right levels of zinc, it's available from Classic Oils for £31 per 5 litre pack.
http://www.classic-oils.net/Product-349/Products-b...
An excellent synthetic oil that's perfect for the old Rover V8, and sold at the right price.
And if you want the best filter, get one of these:
Just email David Brown at: slicebrown@hotmail.co.uk
More detail here:
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
I also run a heavy duty FilterMag and my own super strong magnetic sump plug for good measure
Details here....
http://www.pistonheads.com/gassing/topic.asp?t=135...
SILICONEKID345HP said:
Is it true running your engine on LPG results in premature head gasket failure.
No, there's no truth in that whatsoever If you are referring to the statement you often hear that an engine will run hotter on LPG than petrol, this is what I've found.
Firstly there is no difference in coolant temps on my Chimaera between the fuels, I have monitored this closely using the Canems software which gives very accurate coolant temps... unlike the TVR gauge.
Secondly I run two EGT sensors, one in each manifold, this allows me to very accurately monitor exhaust gas temperatures on each bank.
Again there is no difference in EGTs between the fuels, I can switch fuel type on the fly at any speed and the EGTs remain rock solid between gas and petrol under the same engine load.
So does an LPG run hotter on LPG than petrol?
Well mine doesn't!
Will running LPG increase the likelihood of head gasket failure?
I really can't see why it would.
Have literally thousands of old Range Rovers run fine for thousands of miles on gas without doing their head gaskets?
Yes
Does the Rover V8 suffer head gasket failure and slipped liners?
Yes, but it happens on petrol or gas and is all to do with weak block castings and poor maintenance of the cooling system, not the fuel type used.
Do old high mileage Range Rovers that are virtually worthless get put on gas and then run on a suicidally low maintenance budget?
Definitely
And there in lies the real answer to your head gasket question....
Argent said:
Been lurking for a long time and sorry to be off topic but C on G isn't detonation due to high cylinder temp or carbon build up on piston crowns and pinking due to over advanced ignition? BTW always read your posts with interest.
A.
Detonation is just another word for pinking, or ping if you're a Yank.A.
It's all the same thing.
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