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Old 27-05-2019, 10:19 PM
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RAW454 RAW454 is offline
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Breather Blow-by / BBC Catch Can Ideas?

Heyaz, so I could probably extend one of these threads, but.. nah

BBC Valve Cover Baffle Threads
http://www.usmuscle.com.au/Forum/showthread.php?t=12945
http://www.usmuscle.com.au/Forum/showthread.php?t=14544

The reason being, the baffles I used are not stopping my 454 BBC blowing oil out the breather under high revs / pressure. My sitch:

-- 2x billet valve cover breathers: One through PCV into carb air cleaner, other free air

-- GMPP valve covers, machined for breather holes & baffle plates added (to try & fix last time, per above thread)

-- On the dyno or at the track it P!SSES oil out the breather enough to smoke hardcore off the headers (enough for the Calder Fire Crew to chase me down with extinguishers drawn) or leave a pool on the dyno floor (Garry Chev wasn't pleased)

So... Looking to install a super subtle catch can. Even if only one I hook up for the very rare visit to the track/dyno. Though part of me says, if an issue, leave it in place.

QUESTION: Anybody see a real subtle catch can setup? On a BBC or other? Ideally keeping this style 'breather' on the valve cover. Or a (safe/legit) temporary solution?

Otherwise I'll get something like this and find a place for it, along with new breathers (would rather not..) https://www.jlttruecoldair.com/jlt-o...-3-0-base-kit/


My engine bay FYI:
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Cheers. Deano.
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'67 Camaro: RHD - Fresh 454 BBC (Forged 10.4:1, Eddy Alloy Heads, Isky 280 Mega) - Holley 830 Annular - RPM Airgap - MSD - 3" system - 2500 HD T400 - 9" TrueTrac 3.5 - 15" Autodrags... with a bit too much heartache to update HERE.

Last edited by RAW454; 27-05-2019 at 10:43 PM..
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  #2  
Old 27-05-2019, 11:21 PM
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RAW454 RAW454 is offline
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Bit of reading on topic. Seems is not uncommon...

https://www.hotrod.com/articles/0712...-installation/

https://www.hotrod.com/articles/vent...haft-pressure/
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Old 27-05-2019, 11:25 PM
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69SSBB 69SSBB is offline
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My set up might suit what your looking after same valve covers your battery is in boot only thing i had to do was get a matching powder coated black windscreen washer made up as original one wouldnt fit anymore
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Old 27-05-2019, 11:29 PM
seanj seanj is offline
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Whatever you do you’ll need to replace those breathers on the rockers. At full throttle the engine pulls no vacuum, so engine won’t draw excess oil vapours back into the engine.

Either have a better (seperate, media filled) breather and remove your PCV.
Fancy anodised black breather. http://www.radiumauto.com/Universal-...-Can-P178.aspx

Or run a better quality air oil separator that plumbs back into the intake.
High quality air/ oil separator. (Plumbs back into intake). These have replaceable filters. https://www.autobarn.com.au/pe56052
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Old 28-05-2019, 09:01 AM
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don't want to be "that guy" but obviously there is more of an issue present for it to have that much blow by... maybe sort that out instead of band-aiding it???

otherwise i recon 69SSBB's setup looks mint
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Old 02-06-2019, 09:21 PM
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RAW454 RAW454 is offline
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Cheers Coxy.
Looks like a sweet set-up. Wish I'd need it before drilling breather holes & getting baffles welded in May look at that next time or if swap covers, but probably only after a simple fix to what I've already got to see me through those rare extended-WOT applications.

Thanks Sean.
I think your suggestion is probably the direction I should be looking. There seems to be so many mixed opinions on PCVs, but it seemed to help mine run better years ago when first fitted & run one (& breather on opposite side) ever since. But sounds like you're saying swap the PCV for a 2nd breather/catch can?

Not seen those style of separator per the autobarn link before. Not the prettiest, but I'm sure they're effective.

Yeah, I don't disagree Marc,
But from what Ive read, seems is not an uncommon issue in BBCs. Hence the market for solutions Is not litres of oil I'm losing, but makes quite the show when hits the header...
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Old 06-06-2019, 12:46 PM
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Quote:
Originally Posted by RAW454 View Post

Yeah, I don't disagree Marc,
But from what Ive read, seems is not an uncommon issue in BBCs. Hence the market for solutions Is not litres of oil I'm losing, but makes quite the show when hits the header...
didn't want to sound like a douche... ha ha

i haven't experience the blow by yet, but my engine is a stock 502 with few miles on it so i figure i won't for a while. Mine just has a vent back to the intake and the other rocker cover has like a breather/check valve
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502BBC + 5spd Tremec = whole lot of Smiles per Gallon.....
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Old 16-06-2019, 09:56 PM
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RAW454 RAW454 is offline
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Starter re-watching some of the older Roadkill episodes (as got MotorTrend subscription & watched near everything else) and noticed when the Crusher Camaro had the blown 489 big block, they had zip-tied terry towelling rags around all of the the breathers.

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But then I looked up more Google pix & they were either not there or had this dealio:

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In any case, really doesn't seem to be an uncommon thing on BBCs the more I look into it.

I wonder if this towelling is a 'good enough' solution for my very, very rare dragstrip & dyno runs (only time blow-by happens)?
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'67 Camaro: RHD - Fresh 454 BBC (Forged 10.4:1, Eddy Alloy Heads, Isky 280 Mega) - Holley 830 Annular - RPM Airgap - MSD - 3" system - 2500 HD T400 - 9" TrueTrac 3.5 - 15" Autodrags... with a bit too much heartache to update HERE.
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Old 18-06-2019, 06:23 PM
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Check this out Dean :

video-the-importance-of-using-a-catch-can-system
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Old 19-06-2019, 12:50 AM
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My twin catch cans work great, but currently vent to atmosphere. I'm changing that as we speak, LH side one will now use a PCV and route to back of carb
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