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surf_n_ride

New Member
Hi,
Is there any way where i can minimize engine oil coming out from the air filter due to back pressure from the turbo? It's annoying!!!

Thanks for responding.
 
A 12J with a turbo? Do you mean that you've bolted a turbo onto a normally aspirated engine, or is it in fact a 19J Turbo Diesel? You would need to fit the uprated lucas/cav fuel pump (as found on the 19J) for the boost control which might be a cause of your problem.

OR (more than likely)...

Where is the oil coming from? if it's oil in the air filter housing I wouldn't look at the turbo, I'd consider the state of the engine its self. Disconnect the breather pipe from the oil filler cap to the intake manifold and blank the hole on the intake manifold so that it can't suck anything small in. Start the engine and rev it hard so that it's up to temperature quickly. Then, whilst someone revs and maintains a steady RPM higer than the tickover speed, remove the dipstick and push your thumb over the opening of the tube whilst also blocking the breather hole on the filler cap. After about 5 seconds, remove your thumb from dip stick tube, does it hiss and launch oil at you?

If so, you've got cracked pistons, worn rings or possibly a cracked block which was in fact the problem when land rover originally manufactured the 19J engine (basically a 12J with a turbo stuck on the side).

Let us know what you find, and we'll take it further from here!
-Pos
 
pos said:
A 12J with a turbo? Do you mean that you've bolted a turbo onto a normally aspirated engine, or is it in fact a 19J Turbo Diesel? You would need to fit the uprated lucas/cav fuel pump (as found on the 19J) for the boost control which might be a cause of your problem.
Click to expand...

You don't NEED the 19J IP, you can bang on the turbo and keep the fueling the same and it will give you a slightly better economy, and the engine will last longer because its not being pushed!
 
Maybe not, but the CAV pump that they used on the 19J had the extra bit which pipes fuel to the turbo to adjust the boost doesn't it? Does that actually make much difference?
 
that is the pipe from the turbo which controls the diaphragm in the pump to give more fuel when under boost, not the other way round. the only thing that controls the boost is the wastegate which can be adjusted manually.
the n/a pump does not have this obviously.
running a 12j with a turbo would be ok with mild boost but long term could do some damage as the engine would be runnng too lean.
As said above the breathing out of your crankcase is a trait of these old engines. to find one that doesnt breathe is difficult! If its a problem with filling your air filter or even worse, the engine could run up on its own oil and blow itself to bits, put the breather pipe into a bottle and tip the oil back in every once in a while.
 
Tig9619 said:
that is the pipe from the turbo which controls the diaphragm in the pump to give more fuel when under boost, not the other way round. the only thing that controls the boost is the wastegate which can be adjusted manually.
the n/a pump does not have this obviously.
running a 12j with a turbo would be ok with mild boost but long term could do some damage as the engine would be runnng too lean.
.
Click to expand...

There is no such thing as a diesel engine running too lean.
This can only happen in spark ignition engines, where the fuel and air are mixed prior to entering the cylinders. Lean MIXTURES of fuel and air in spark ignition engines usually result in over-heating and burning of valves spark plugs and even pistons.

In compression ignition engines with fuel injection into the combustion chamber the fuel ignites in a stream as it exits the injector tip. It does not all go in and THEN ignite.

Bearing in mind that the engine takes in full air all the time, the power output is controlled ONLY by the amount of fuel introduced into that full air charge.


On tickover very short fuel stream - hardly any.
On light throttle short fuel stream
On more throttle longer fuel stream.

But at no stage can there be a lean mixture, because there is no "mixture".

What could happen in the NA engine with turbo is too much boost might increase the effective compression too far, but I don't think it would matter. The efficiency and economy would be better for sure, and a slight performance gain.


CharlesY
 
granted but it wouldnt last very long i wouldnt have thought, unless it was a fresh engine. could possibly hole a piston if too much boost due to the heat and no coolers.
I know have done all this myself.
 
pos said:
Maybe not, but the CAV pump that they used on the 19J had the extra bit which pipes fuel to the turbo to adjust the boost doesn't it? Does that actually make much difference?
Click to expand...

No it carrys air, this actuates the diaphragm acting against a spring, as it moves it influences the governor to allow more fueling.

So if you don't have this, the turbo will blow away happy as larry, NO more fuel will ever get injected so what is getting put in will just result in a more complete combustion cycle.

So giving you a slightly better MPG a little more at the top end

At this the cooling system is not going to have to deal with much more heat no more than a foot to the floor ride down the motorway.

Anyone smart enough to watch the temp guage is going to note if the temp is coming up too much and back off a little on a fast stretch of road, the 2.5NA cooling system is not going to be harmed in any way.
 
Last edited:
In ALL internal combustion engines, the higher the compression ratio that can be used, the higher the thermal efficiency that can be achieved. It's the way of things.

That is why army low compression engines are markedly less efficient (sluggish, and use more petrol) than the higher compression civilian models. You may want to know that armies did this so that they could use rubbishy fuels without wrecking their engines. That was the THEORY behind it.

The efficiency of diesel engines comes mostly from the very high compression ratio.

In Turbo engines when cruising along even without boost there would be an excess of air in the cylinders during combustion. "Mixture" or fuel-air ratios doesn't come into it in diesels. The effect of the turbo is to ram in excess air and thus to increase the effective compression ratio, which makes it even more efficient.

My TD5 has a magic (but very boring!) cruising speed at about 54 - 55 mph. On a long run like here to Surrey I can get well over FORTY miles per gallon. I have a boost gauge and driving on cruise control at that speed there is a constant 0.5 bar (7-8 psi) boost.

Discomania is quite correct. A turbo on a NA giving a light blow of boost will do no harm, and will simply make it run a wee bit sweeter.

CharlesY
 
Hello Pos,
So what am i doing? disconnet the breather hose and connet it to the much larger hose which is the turbo?
From what i see the engine have a 12J block and a 19J head that explains the turbo and the two pipes coming from the breather cap.(that how i got it from the previous owner)
If i have internal engine problem as you mention above, what are other symptoms? If the Block is crack the first thing i will look for is the colour of the coolant. also i will have a overheating problem which means the needle will get to the red zone the way i drive. Piston rings will cause black smoke all the time. I don't have this problems. my engine sounds healthy. What other symptoms can you thing of? the oil is coming from the air filter housing. Sometime i will see more oil on the road others there are just a couple of spoon full.
Any help is greatly appricated
Thank you all.
 
Tig9619 said:
... If its a problem with filling your air filter or even worse, the engine could run up on its own oil and blow itself to bits, put the breather pipe into a bottle and tip the oil back in every once in a while.
Click to expand...

Tig9619, That has got to be bodge of the month, I love it. Perhaps we should have a bodge of the day thread. :D
 
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