Crankcase vacuum pump

[Kw9006nz]

Afternoon everyone, while rolling down the road a few days ago, my thoughts wandered to crankcase pressure and vacuum, I know any pressure at all is bad for the cams, but what about a vacuum? Not much just 2-3 in h20. It cuts windage, it helps seal rings, it pulls the fumes out Not letting them linger in the block, supposedly frees up a potentially unmeasurable amount of hp, and by my rink dink thinking, might pull oil to to top for the cams. Idk just thinking out loud here guys.

any yays or nays, thoughts ideas

[tree98]

Your basically talking about a PCV valve. Funny I actually had the exact same thought recently. I just don't think its worth what it would take to make it happen.

[Rawze]

(03-19-2026 )Kw9006nz Wrote:  Afternoon everyone, while rolling down the road a few days ago, my thoughts wandered to crankcase pressure and vacuum, I know any pressure at all is bad for the cams, but what about a vacuum? Not much just 2-3 in h20. It cuts windage, it helps seal rings, it pulls the fumes out Not letting them linger in the block, supposedly frees up a potentially unmeasurable amount of hp, and by my rink dink thinking, might pull oil to to top for the cams. Idk just thinking out loud here guys.

any yays or nays, thoughts ideas

== That whole vacuum making better hp garbage arguments found on social madai is only relevant for engines that are turning some serious RPM's on racing applications. Does noting to regular enignes that do not turn big rpm numbers.

NEXT, is HOW you get a vacuum. This is seriously problematic in itself.. as any turbocharged engine is going to have positive pressure at its intake manifold. So ... putting a line at the intake of the turbo is the only real spot, and this GUMMS UP THE ENTIRE INTAKE SYSTEM AND CAC.. making a HUGE MESS!!!. - This is already done on diesel cars and pick-ups and its always been a huge problem over time for them.. yielding lower fuel mileage and creating other issues as the intake components (CAC, piping, cylinder head, etc.) get gummy and clogged up.

The most effective solution is to have NO crank case pressure buildup.. and also have NO vacuum... and well ventilated cc fumes relief tube going down under the engine somewhere where its safe (away from high heat sources).

(Just my own thoughts, this would not be a bad solution)...
- If anything, someone could get the best of both worlds by simply using a larger relief tube, it going down under the vehicle, bend + cut it at a high angle at the bottom with it in the air-stream at highway speeds, so that it creates a natural venturi effect, putting a slight vacuum in the block while cruising. Someone could measure cc pressures/vacuum at the valve cover and then adjust accordingly... come up with something actually useful on this subject.

[Kw9006nz]

By no means am I even remotely insinuating pulling the fumes back through the intake, i own ford ecoboosts and the intake mess on those almost have me wanting bigger v8s again, side I don't partake in any social media other than this forum.

My thoughts leaned towards an electric vacuum pump pulling fumes from cc tube then exhausting straight to atmosphere. That way it can be mounted remotely and have the exhaust routed where ever a guy would want it. Kits are around 300-400ish more if you want less if you want.

Long term, depending on pump life, I feel there wouldn't be to many draw backs other than the pump potentially seizing and not letting cc fumes by pass. Would it be worth the aid in evacuating the fumes, lowering chases of oil leaks, and theoretically bringing more oil to the cams? (Thought here is if pressure lowers oil to the top the reverse would be true to bring more oil to the top)