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PCV Air Oil Separator or Catch Can

General engine tech -- Drag Racing to Circle Track

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RT Machine
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PCV Air Oil Separator or Catch Can

Post by RT Machine »

I have always used oil catch cans for performance street/ strip cars, but they are a bit large in some applications.
Is a PCV oil / air separator better than a catch can ? given that it is pulling a small vacuum on the crankcase.
Moroso make a small air / oil separator , that is very compact compared to most oil catch cans, and can be fitted easily in tight applications.
P.N. 85682.
I would like to use these, but don,t know anyone who has any experience with them.
Like to hear from anyone who has.

Cheers.
steve cowan
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Re: PCV Air Oil Separator or Catch Can

Post by steve cowan »

20210101_190824.jpg
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20210101_190910.jpg
20210101_190917.jpg
I ran this set up for a few years with no issues, I wanted to plumb a vac u pan setup into the catch can but running a full exhaust system might not of benefited using a vacuum u pan so I didn't bother.
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steve c
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Re: PCV Air Oil Separator or Catch Can

Post by RT Machine »

steve cowan wrote: Fri Jan 01, 2021 4:18 am 20210101_190824.jpg20210101_190840.jpg20210101_190910.jpg20210101_190917.jpg
I ran this set up for a few years with no issues, I wanted to plumb a vac u pan setup into the catch can but running a full exhaust system might not of benefited using a vacuum u pan so I didn't bother.
Thanks Steve, looks great, i see you have used the Moroso PCV / Air/ oil separator but not with a
PCV instead venting it like a normal catch can setup.
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Re: PCV Air Oil Separator or Catch Can

Post by steve cowan »

I have not done much with PCV set-up in a performance application,I don't have any links but I have read it here on the forum.
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Re: PCV Air Oil Separator or Catch Can

Post by RT Machine »

steve cowan wrote: Fri Jan 01, 2021 5:46 am I have not done much with PCV set-up in a performance application,I don't have any links but I have read it here on the forum.
Cheers Steve.
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Re: PCV Air Oil Separator or Catch Can

Post by dfarr67 »

BradH
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Re: PCV Air Oil Separator or Catch Can

Post by BradH »

The M/E Wagner one linked above is the one that caught my attention. I like the idea... not so much the price.
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Re: PCV Air Oil Separator or Catch Can

Post by RT Machine »

Thanks for the link, that is a real nice item, looks like quite a bit of development and test work has gone into it.
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Re: PCV Air Oil Separator or Catch Can

Post by skinny z »

Not sure of the level of performance your performance street car might have but I've incorporated Moroso's 85474 as part of my PCV system.
Breather on the passenger side valve cover. PCV valve on the driver's side cover. Then to the oil separator and on to the inlet at the rear base of the carb. All 3/8" hose.
The can is mounted on the rad support (circled in the picture).


MOR-85474_ml.jpg
Moroso.jpg
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Re: PCV Air Oil Separator or Catch Can

Post by dfarr67 »

BradH wrote: Fri Jan 01, 2021 12:48 pm The M/E Wagner one linked above is the one that caught my attention. I like the idea... not so much the price.
What can I say- when you need it......no more oil in the plenum and I'm sure tuning is easier without any oil migration into the cylinders- less anyway. don't overlook working on the valve cover baffles- I stuffed ss wool inside.
I put together a group buy some months ago to get a deal on the pcv- it was worth the hassle.
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Re: PCV Air Oil Separator or Catch Can

Post by skinny z »

dfarr67 wrote: Fri Jan 01, 2021 7:09 pm I put together a group buy some months ago to get a deal on the pcv- it was worth the hassle.
I remember that (or think I do). I almost jumped on board.
I may pursue this again if another deal comes up.
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Re: PCV Air Oil Separator or Catch Can

Post by RT Machine »

dfarr67 wrote: Fri Jan 01, 2021 7:09 pm
BradH wrote: Fri Jan 01, 2021 12:48 pm The M/E Wagner one linked above is the one that caught my attention. I like the idea... not so much the price.
What can I say- when you need it......no more oil in the plenum and I'm sure tuning is easier without any oil migration into the cylinders- less anyway. don't overlook working on the valve cover baffles- I stuffed ss wool inside.
I put together a group buy some months ago to get a deal on the pcv- it was worth the hassle.
Thanks dfarr67, good info.
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Re: PCV Air Oil Separator or Catch Can

Post by skinny z »

RT Machine wrote: Fri Jan 01, 2021 3:57 am
P.N. 85682.
I would like to use these, but don't know anyone who has any experience with them.
Like to hear from anyone who has.
Similar I think to Moroso's 85474?
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Re: PCV Air Oil Separator or Catch Can

Post by vht »

What PCV valve could you use on a 11 to 1 427 BBC with a semi radical hyd roller? It's not together yet where I could check the vacuum but if someone could give a pt # for a starting point. It's street and strip and I have been wondering how I'd plumb it in. I'm planning on running the stock type BBC chrome valve covers from Camaro central that are taller to clear roller rockers. I would think they would have good baffles.
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Re: PCV Air Oil Separator or Catch Can

Post by skinny z »

vht wrote: Mon Jan 04, 2021 8:41 pm What PCV valve could you use on a 11 to 1 427 BBC with a semi radical hyd roller?
Somewhere I've a file with a list of the some of the more "radical" Chevy engines from the late 60's, early 70's and their respective PCV valves. It's thought they these might be a decent match for a modern equivalent with respect to idle and cruise vacuum. I'll make a point to dig it up and post back here. Maybe that'll help?
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