LS1 Catch Can Setup - Is this right??

[***VX*R8***]

I just bought a catch can and wanted to check if this is the right way to set it up...
First pic is what I found on the net but am unsure if it's right. Second pic is how I was going to run it but just want to double check first.
Car is a 2000 vx Clubsport and catch can will be sealed.

Also the PCV valve is approx 18mm inlet and 10mm outlet. My catch can came with 10mm and 14mm fittings. I was going to run a 10mm fitting on the inlet to can and 14mm on outlet of can then use a reducer to go from 14mm to 18mm hose to fit over the big end of PCV valve. Or is there a better way...?

http://i297.photobucket.com/albums/mm207/jamesjgts25t/c3.jpg

http://i297.photobucket.com/albums/mm207/jamesjgts25t/c1.jpg

Thankyou.

[macca33]

The second Dwg looks to be the correct one for the LS1 PCV set-up your Clubby would have.

[JezzaB]

Thought it was a map of Etihad stadium for a minute there :p

Both will work but as Macca said the last pic will be the easiest in you application.

[***VX*R8***]

Too easy. THANKS HEAPS!!!

Am I ok to run the 10mm inlet and 14mm outlet on catch can and then just step the hose up from 14mm to 18mm at the PCV valve?

[macca_779]

Too easy. THANKS HEAPS!!!

Am I ok to run the 10mm inlet and 14mm outlet on catch can and then just step the hose up from 14mm to 18mm at the PCV valve?

I think it would be better to keep it all the same size. It could mess with flow/pressure characteristics

[***VX*R8***]

That's what I was worried about but can't figure out any way around it as the PCV valve is 18mm on one end.
I found these pics on the net but unsure of what they have used...

http://i297.photobucket.com/albums/mm207/jamesjgts25t/c.jpg
http://i297.photobucket.com/albums/mm207/jamesjgts25t/c.jpg

[savage1987]

I very much doubt hose diameter will matter (maybe unless you throw a 100mm pipe section in there).

Mine changes slightly due to PCV valve and I have no trouble :) catches plenty of oil.

[motorin on]

I know the basics behind the purpose of a "catch can" from reading Street Commodore magazine,but how "tired " does an engine (LS1) have to be to benefit from putting one/two under the bonnet or will the can help on a "healthy" engine also

[macca33]

I know the basics behind the purpose of a "catch can" from reading Street Commodore magazine,but how "tired " does an engine (LS1) have to be to benefit from putting one/two under the bonnet or will the can help on a "healthy" engine also


Yep, they will all benefit from a catch-can, no matter the mileage.

cheers

[motorin on]

Yep, they will all benefit from a catch-can, no matter the mileage.

cheers
thank's - i will have to try find one and see what happens as far as picking up oil-mbe it will cure other problems also (IAC)-HAHAHAA

[madalpinestar]

If you don't mind me asking what is the benefits of a catch can?

[savage1987]

It catches oil that would normally make its way into the intake manifold (and from there into the combustion chamber mixture), particularly at higher RPM levels.

It can really only be a good thing. :)

In practise, on an LS1 they will help reduce oil in the mix at high RPM which leads to a drastic drop in effective octane rating = ping = PCM retards timing :)


That's my understanding of them in a nutshell. I just know they make something work better/cleaner so I like them :)

[madalpinestar]

It catches oil that would normally make its way into the intake manifold (and from there into the combustion chamber mixture), particularly at higher RPM levels.

It can really only be a good thing. :)

In practise, on an LS1 they will help reduce oil in the mix at high RPM which leads to a drastic drop in effective octane rating = ping = PCM retards timing :)


That's my understanding of them in a nutshell. I just know they make something work better/cleaner so I like them :)

thanks, might look into setting one up they do sound good

[macca33]

I took a couple of pics of mine tonight, to show people how it is set up. As I mentioned earlier in this thread, the second pic the OP posted, is the way mine is set up, ie...

867

With the LS1 PCV system, it is done like this:-


Here you can see the LS1 PCV system which commences at the passenger side rocker cover with the first connection and the hose runs behind the motor then branches to a hose connected to the rear of the driver side rocker cover and then there is the throttle body hose connected to the front of the driver side rocker cover.

http://i324.photobucket.com/albums/k339/macsen8r/HSV VX Senator 300/Senator 300 DIY/DSCF2714.jpg

My can is set up with one line in / out and I've got a couple of PCV valves inline, rather than the usual single unit. The catch can out is connected to the intake manifold.

http://i324.photobucket.com/albums/k339/macsen8r/HSV VX Senator 300/Senator 300 DIY/DSCF2713.jpg


The LS6 system is easier as it has only one hose connecting the two points - the PCV outlet atop the valley cover at the front of the engine and the intake manifold entry point is the same as the LS1 system.

cheers

[savage1987]

Macca, nice catch can you have there :) Mine looks the same only silver :p


Why did you go with two PCV valves?

[macca33]

Macca, nice catch can you have there :) Mine looks the same only silver :p


Why did you go with two PCV valves?


Cheers mate. Why 2 x PCV valves - only because I had one spare and thought that two would be better than one?!?!?

[QldKev]

Although I think this topic is done n dusted, I though I would confirm I have mine setup the same way

Pics and descriptions on mine on my website qldkev.net, under LS1 howto.

QldKev

[motorin on]

I have been looking at the set up photos and don't understand why 1 hose still goes direct from engine to throttle body bypassing the catch can
Doesn't that defeat the whole purpose of the can as it will only filter 1/2 the amount of dirty air going into the intake manifold
I would have thought both sides of the motor need to feed into the can

[savage1987]

I think that's the supply of fresh air - the hose under vacuum is regulated by the PCV and that one you are talking about acts as a bellows to allow fresh air into the system again.... i could be wrong :)

[macca33]

I think that's the supply of fresh air - the hose under vacuum is regulated by the PCV and that one you are talking about acts as a bellows to allow fresh air into the system again.... i could be wrong :)

You are correct - fresh air from the TB to pressurise the PCV system.

cheers

[motorin on]

You are correct - fresh air from the TB to pressurise the PCV system.

cheers
Thank's guy's== Learn something new every day-I always thought the pistons going down towards the sump provided some pressure up through the oil valley's and the intake manifold the suction
Guess I should stick to carbie engines-don't understand a lot about fuel injection workings==old dinosaur

[QldKev]

Thank's guy's== Learn something new every day-I always thought the pistons going down towards the sump provided some pressure up through the oil valley's and the intake manifold the suction
Guess I should stick to carbie engines-don't understand a lot about fuel injection workings==old dinosaur

You are correct, but unless you are having an issue with too much blow by you should not get a huge turn over of air. Allowing the small amount of air would allow for too much oily crap building up. With positive crankcase ventilation you allow the engine to draw of a larger amount of air than would otherwise (ie suction from the manifold) Since you are drawing of more air than the blow by, you need a fresh air feed for the system.

[Ryan101]

QldKev, what a good read