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I could make a vacuum pump setup that's driven off the exhaust cam like a mechanical fuel pump. It wouldn't be hard, but the issue is cost. Moroso makes some nice vac pumps but at $700 it doesn't make sense. By the time I added in an adapter, a mount and maybe even a cam gear you're looking at probably more than $1000. If your PCV system is that bad the clear choice in my head would be to move to a dry sump and eliminate PCV and oil starvation issues in one move.
I think PCV issues are something that doesn't need to be overthought. I like Mike's idea, 2 vents off the top of the valve cover with foam in the baffles and enough drainage holes plus one decent sized vent somewhere close to the rotating assembly should be good enough to solve most guys' issues. If that doesn't suffice then I think ring/cylinder wall sealing issues are a likely culprit. I don't believe in putting band aids on broken bones, overbuilding a PCV system to cope with excessive blowby is a bad approach.
Yeah, thats why I drew my little drain back idea. Its simple, adds a vent to the block side with no maintenance to worry about draining. I think even stock PCV system would work in this case too. And then it should be totally reliable and simple.
I think dedicated racecar solutions aren't always the best approach for everybody. so its good to consider other options that wont require drilling the block (could be a solution one can sell)
To be honest I dont know why the extra port need to be closer to the crankshaft. I thought theres enough passages that the crankcase & valve cover is practically one volume of space. is there a restriction there?
You don’t have to run Moroso. Any suitably sized brake booster vacuum pump of a Diesel engine could potentially work, only issues I can think of would be are they able to handle the extra few thousand RPMs of a petrol engine and would the seals hold up to ethanol mixed oily vapour.
You really dont need a vacuum pump. Unless you got big drag cams we have plenty of idle vacuum and can create vacuum in the intake manifold on boost to an effect of a pretty large potential volume.
Im guessing a completely stock setup with the PCV valve intact and side port hooked up with just an added block vent is all most of us would ever need. The head ports are purely because we're just doing all we can to get block pressure to 0 (a true vacuum is unrealistic) but if we're sucking out from the crankcase directly seems that would have a major effect.
I also use to be against draining back into the block but have changed my views after finding more research and info on it.
I also use to be against draining back into the block but have changed my views after finding more research and info on it.
on this topic IMO no drain back if you use some steel wool stuff or something that would deteriorate. No drain back if you have a spacious catch can or has a breather ... water is guaranteed to condense in there every morning
on this topic IMO no drain back if you use some steel wool stuff or something that would deteriorate. No drain back if you have a spacious catch can or has a breather ... water is guaranteed to condense in there every morning
Yeah, very true. If you have a closed system, shouldnt be a problem (assuming no steel wool). Need to find a good coalescing medium that isnt steel wool and wont deteriorate.
Mitsubishi components are normally interchangeable across many models.
Surely there is a diesel based engine somewhere that uses the same Evo Alternator mounting pattern, and it's got a vaccum pump bolted onto the back of it?
So that would put the vacuum pump on the back of the block. The just route the lines wherever you want?
Yeah, very true. If you have a closed system, shouldnt be a problem (assuming no steel wool). Need to find a good coalescing medium that isnt steel wool and wont deteriorate.
(could be a solution one can sell)
