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Username Post: Oil catch cans on FI/carb engines        (Topic#361043)
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-20-20 11:29 AM - Post#2794284    

The topic has not been covered or I missed a discussion. Who has one installed? Good or bad for carb engines? Worse or better for FI engines?

Filter vs no canister filter? Can or moisture remover (like a compressor) set up? Which one works better?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 




dgstarr 
"3rd Year" Silver Supporting Member
Posts: 190
dgstarr
Loc: Portland, OR
Reg: 04-16-13
05-20-20 03:26 PM - Post#2794303    
    In response to gchemist

A catch can is sometimes used on direct injection engines because the detergent gasoline does not come into contact with the back of the intake valves. Oil vapor in the PCV circuit is pulled past the intake valves by vacuum. I am using one on my 2015 Silverado 5.3 V8. I catch up to 1 oz. of liquid every 1000 miles. This prevents coking on th back of the valves and stems.



Edited by dgstarr on 05-20-20 04:42 PM. Reason for edit: No reason given.

 
Rick_L 
Member #409
Posts: 27733
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
05-20-20 04:20 PM - Post#2794310    
    In response to gchemist

It is not uncommon for a modified LS engine to use one as part of the PCV system. Note that most LS engines don't have a PCV valve in the traditional sense. I've never seen or heard of using a catch can on a carb'd engine.



 
dgstarr 
"3rd Year" Silver Supporting Member
Posts: 190
dgstarr
Loc: Portland, OR
Reg: 04-16-13
05-20-20 05:20 PM - Post#2794318    
    In response to Rick_L

My 2015, 5.3 LS engine has a PCV valve from the crankcase near the front of the intake manifold. The hose runs about halfway back on the drivers side and enters the intake manifold. I have installed the catch can in this line. I used an Elite catch can.



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-23-20 05:46 AM - Post#2794531    
    In response to dgstarr

Our Acadia has a short PVC connection from valve cover to intake hose. The air hose has a molded part to catch oil. If I install a catch can, how important is it to have or not have a breather? The connection is past the MAF sensor.

Attachment: pvc.jpg (83.37 KB) 4 View(s)


Acadia 3.6 PVC


'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
65_Impala 
Very Senior Member
Posts: 4494

Reg: 12-29-02
05-23-20 06:24 AM - Post#2794537    
    In response to gchemist

It should not have a breather.



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-23-20 02:42 PM - Post#2794566    
    In response to 65_Impala

I was thinking the same thing. There is plenty of space on the fan shroud to mount one. The air intake tube was full of ugly oily residue.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25179
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
06-08-20 09:24 AM - Post#2795886    
    In response to gchemist

GM put two types of crank/block vents on 3.6 SMPFI engines. One PCV goes in before the TB. The back cover uses a smaller line. The line runs behind the TB. The back side has a PCV adapter with two holes. The holes are about the size of a good nail. Why are they different and use two different burn routes? Would it hurt to run both lines to a single catch can?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 




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