Oil catch cans?

This question seems to be aimed at the manufacturers and I dont think many of them hang around forums.
Catch cans are a contentious issue. A lot of people think if you put the right oil in the motor you shouldn't need them. Vehicles have been running PCV's since the mid 70s with no problems and I've seen cars with a million ks on them. Like adding an extra fuel filter. Is it needed or is it just bullshit. All depends what armchair expert you ask.

$$$.
They'll save 5c on a bolt if / when they can, a part like a decent quality oil catch can would give them total nervous breakdowns.

Yes definitely worth it, no their not all the same you need something that will actually do the job correctly, catch the oil mist and prevent it from continuing it's journey through the motor. Some vehicles will be chocked up earlier than others one of my neighbours 07 BT50 was ok when he fitted a catch can the other neighbours Navara had it's intake manifold about 30% chocked up with crap and he does more long distance driving.

I recon another reason it s not standard is that manufacturers do not want to introduce another servicable item. Imagine people who do not understanding the EGR (90% of people) and them faced with an item that needs to have dirty oil drained every 5,000km

If the vehicle manufacturers fitted a decent baffle/filter system into the top engine cover then there would be no oil mist passing through the PCV system, and so there would be no need to be fitting any form of after market oil catch can system.

In days long gone before the introduction of the PCV systems the very same manufacturers used to fit suitable systems to prevent the oil mist from passing down the old Road Draft Tube (or walking stick), and subsequently leaking oil onto the road surface. With the introduction of the PCV that type of system was no longer seen as necessary, and as there is no perceived problem within the warranty period then the manufacturers will not spend the few cents that would be required to stop/reduce the issue of blocking manifolds that we are now seeing as vehicles age.

Regards
Athol

A mechanic on another forum posted he has always found the engines fitted with catch cans to have lower compression ratios after many kms than engines not fitted with them.

It would seem though probably not intended that the oil ingested by the engine from the PVC acts as an upper cylinder lubricant reducing wear. Now some that fit catch cans also fit an oil injection system to overcome this issue.

Another issue is the residue still builds up though over a longer time but many have commented it is a lot harder to remove the residue from motors fitted with catch cans than those that don't have them as it is drier and sets harder.

To me seems like a lot of effort to get around the actual problem which is still there, that is soot from the EGR system being ingested by the engine. Some of the after market tuning mobs are now also de-activating the EGR system in the engine ECU's, there is also one company selling an add on unit for some models that is used in conjunction with an EGR blanking plate to completely block off the EGR flow without causing the engine computer to throw error codes, IMO one of these methods would be the way to go.

It seems to me that as previously stated, the oil mist from the crankcase, which has been getting fed back into the intake system of both petrol and diesel engines for many years has never caused problems. How much benefit, other than obvious environmental does that bring, is debatable. The "gunk" problem in intake systems that has become a real drama in many cases is being exacerbated by adding exhaust particles.
We now have diesel particulate filters (DPF) to reduce the release of these particles into the atmosphere. If the exhaust gasses that are being recirculated into the intake are taken after a DPF shouldn't that eliminate, or at very least minimise the effect of combining oil mist with exhaust gas?

Just a thought

Cheers
Pop

hi

The problem is known about egr and pcv systems by the makers .
Most do work for a little while until there service is required to unblock and clean out .
Yes there was a service interval for EGR and PCV systems [not in all cars ] .
Apparently its cheaper to service the modern diesel PCV / EGR donot need cleaning
BULLSH*T to the manufactuers
Since they were released in Ozzy . although some models are/were effected worse than others .

Like most things deleted from the maintenance schedule .
JUST DONE TO LOWER MAINTENANCE COST yea we believe u !!!!

To save 5cents per car is why nothing gets fitted to the PCV system

Actually the first Pcv recall to a turbo diesel I experienced was a tojam 1hz turbo
Some early `80 jap cars were very poor for burnt out EGR valves

A few years ago there was a guy, posting on another forum.
He had just purchased a new common rail 4WD and a new excavator.
Upon close examination both had a pretty much identical engine from the same manufacturer.

What up set him was, that the 4WD had a very rudimentary fuel filtration system, typical of what would be found on similar vehicles.
The excavator on the other hand had a very comprehensive multistage fuel filtration system capable of handling large amounts of contaminant and delivering best possible performance.

Here lies the difference ..... Automotive manufacturers are absolutely focused on selling you for the highest possible price and delivering as little as they possibly can.
THEN making as much as they can after the sale.

Most Automotive buyers now very little at all about cars.

Go to earth moving and heavy transport it is a different world.
The owners and operators know a lot more about the vehicle and are a lot more involved in the maintanance ...... and the big players know every damn thing about every vehicle they run, in great detail and they know the costs involved.

This is why you will find things like very efficient oil, air and fuel filtration systems on earth moving and heavy transport and not on retail automotive.

But in those Industries, ya not going to get much choice of colour.

In retail Automotive, there are a whole range of things that are more important to buyers than how good the vehicle actually is.

cheers


OH .... if you want to see who is having a lend of who ..... see how much a lot of truck parts cost compared to passenger cars and how many models they fit.

I just emptied my HPD catch can. After about 5000kms there was about 200ml or so in it. I’m glad I fitted it.