where do you plumb your catch tank into

[Forbez]

Mines the same as above without the drain pipe back to sump.

Phil isnt Bill's going from the rocker cover?

 

[PhilW]

And mine is. Just uses the OE pipework at the side of the block.

Dave, the PCV valve is under the manidold looks like a T-piece and is prone to break and leak boost.

 

[DPJ]

Dave, the PCV valve is under the manidold looks like a T-piece and is prone to break and leak boost.

Ahhh. What's the piece that plugs into the TIP if it isn't a valve, then.

 

[Forbez]

Mushroom thingy

 

[DPJ]

Mushroom thingy

 

[PhilW]

Kind of pressure regulator. Doesnt do much anyway.

 

[DPJ]

I've got a comprehension problem over discarding the PCV system and replacing it with a breather / catch tank system.

As I understand it, PCV systems flush the crankcase with fresh air and then by drawing it into the intake system. Careful design ensures this does not upste air metering.

It seems to me, that by replacing the system with breather / catch tank, you are losing the 'flushing' effect.

If a catch tank with outlet to the inlet manifold was the simple answer, surely it would be cheaper for manufacturers to fit this than the PCV system...

 

[v-g]

I was under the impression that you can fit a catch tank and keep the PCV system.
A catch tank should be as air-tight as the original tubes and hence it won't leak like a breather.

 

[DPJ]

I was under the impression that you can fit a catch tank and keep the PCV system.
.

That would be the simple solution

 

[ibizacupra]

yes you can. but you also risk the PCV sucking the oily fumes into the intake as the vacuum from the inlet manifold draws the oily fume thru and thru the one way valve.

each to their own.
preventing crank pressurisation and keep it closed loop is main reason/emissions method of achieving it.

 

[p34ch3y]

ummmm this is interesting.....so wheres the best place to plumb in then because as long as the catch tank gets all the crap in the catch tank rather than in the TIP then this is good yea

 

[DPJ]

yes you can. but you also risk the PCV sucking the oily fumes into the intake as the vacuum from the inlet manifold draws the oily fume thru and thru the one way valve.

each to their own.
preventing crank pressurisation and keep it closed loop is main reason/emissions method of achieving it.

Bill, do you reckon that, by your method, the crankcase is 'flushed' sufficiently?

 

[ibizacupra]

Bill, do you reckon that, by your method, the crankcase is 'flushed' sufficiently?

Flushed - no
ventillated so no crankcase pressure is created - yes
seperated from intake completely - yes

why flush? whats that actually doing?

 

[DPJ]

Flushed - no
ventillated so no crankcase pressure is created - yes
seperated from intake completely - yes

why flush? whats that actually doing?

I'm learning here - and I'll probably go ahead and fit mine just like yours.

I was just in reading up on PCV systems, it seemed that the designed intention was to circulate air through the crankcase to clear water vapour, and blow-by gases that would otherwise eventually damage internal surfaces.

The point I was trying to make was without the introduction of fresh air to mix with the blow-by gases, you've perhaps got a more contaminated situation in the crankcase that is only being vented through excess pressure.

 

[p34ch3y]

so in terms of fitting the catch tank one pipe on the tee thing that comes off the crank case the other pipe just to vent/breather

and what about this pcv valve...leave it in or out?

dos it realy mater about the pcv valve?

 

[h17och]

bill,

am i right in thinking yhats yours isnt connected to inlet mani? (the connection underneath?)

so you come stright frm rocker and crankcase to tank? with no other connections?

cheers

 

[ibizacupra]

I'm learning here - and I'll probably go ahead and fit mine just like yours.

I was just in reading up on PCV systems, it seemed that the designed intention was to circulate air through the crankcase to clear water vapour, and blow-by gases that would otherwise eventually damage internal surfaces.

The point I was trying to make was without the introduction of fresh air to mix with the blow-by gases, you've perhaps got a more contaminated situation in the crankcase that is only being vented through excess pressure.

re-breathing crankcase pressure as opposed vent to atmos is for emissions... OE cant vent fumes due to regs so shove it down the intake again, and we see how oily that makes things.
the pcv valve brings some suction to the part of trailing throttle to suk , when its not being blown.

water btproduct of combustion is inevitable, which is why oil changes are important (not just sludging)
short journeys etc... create most dampage, PCV cant deal with those conditions.

 

[DPJ]

Cheers Bill. I just like to understand what I'm dispensing with.
As I understand it, pre-PCV, they tried to create a condition with a 'road tube' where the crankcase emissions would be sucked out by air motion past the backward facing tube. This was before emissions regs. They realised road tubes were causing all the smog.

 

[PhilW]

And a small pic of the amount of crap that my catch tank picked up after two months. All this would have either gone down the TIP/blown onto the MAF or been sucked into the inlet mani...

Not nice is it.

 

[h17och]

i must be doing something wrong!? mine dont look too dirty!?