What crankcase ventilation for supercharged 4.6?
Discussion
Hi folks.
Does anyone have any recommendations for how to address crankcase ventilation on a 4.6 with a rotrex blower?
It hasn't got the blower yet, but I'm wondering which way to jump on PCV. I don't really want lots and lots of little trinkets all over the engine bay. The idea is light and fast.
Some say just bung the breather hose into a cut down lemonade bottle(!), others say I will need some all singing all dancing air oil separator, check valves, a breather hose of at least 1" bore from each rocker box, and an oil drain back to the sump... I want to keep it simple, but not to the point of it being a mobile cloud of oil smoke...
What say you, people?
Thank you.
Ed.
Does anyone have any recommendations for how to address crankcase ventilation on a 4.6 with a rotrex blower?
It hasn't got the blower yet, but I'm wondering which way to jump on PCV. I don't really want lots and lots of little trinkets all over the engine bay. The idea is light and fast.
Some say just bung the breather hose into a cut down lemonade bottle(!), others say I will need some all singing all dancing air oil separator, check valves, a breather hose of at least 1" bore from each rocker box, and an oil drain back to the sump... I want to keep it simple, but not to the point of it being a mobile cloud of oil smoke...
What say you, people?
Thank you.
Ed.
Cos at the very least we’d need a check valve to stop boost pressure entering the crankcase.
Plus when you’re supercharged you only get to scavenge the crankcase vapours off boost, so there is a question of whether that is sufficient or whether an air/oil separator vented to atmosphere is a better option...
And I’ve been overthinking it and got into a headf**k...!
Plus when you’re supercharged you only get to scavenge the crankcase vapours off boost, so there is a question of whether that is sufficient or whether an air/oil separator vented to atmosphere is a better option...
And I’ve been overthinking it and got into a headf**k...!
Check out this thread for turbos but the principal is the same.
https://www.pistonheads.com/gassing/topic.asp?h=0&...
https://www.pistonheads.com/gassing/topic.asp?h=0&...
I fitted a Rotrex C38-91 charger to my 500 earlier this year and from experience, you cannot overlook engine breathing.
I started off with the single flame trap plumbed directly to the secondary plenum, but I started noticing oil leaks from the rocker covers, dipstick and rear of the sump.
I have tried various options and found that venting off from both rocker covers, into a small catch tank and plumbing into the secondary plenum has worked a treat.
I decided on two flame traps as that would help in oil separation from the air and then the catch tank being a ‘belt and braces’ approach to ensure no oil going into the intake.
Pics of my set up:-
I started off with the single flame trap plumbed directly to the secondary plenum, but I started noticing oil leaks from the rocker covers, dipstick and rear of the sump.
I have tried various options and found that venting off from both rocker covers, into a small catch tank and plumbing into the secondary plenum has worked a treat.
I decided on two flame traps as that would help in oil separation from the air and then the catch tank being a ‘belt and braces’ approach to ensure no oil going into the intake.
Pics of my set up:-
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