Where are you guys running a vacuum pump pulling your vacuum from? valve cover, back of intake over the valley? What’s the optimum vacuum? Buick Nut installed one on his engine, seems to be a good bit of oil captured after one run.
Have to be careful, to much vacuum and you will suck the pins dry. I like most. Ppl end uo being happy with 6-10 psi from what I understand.....I have never used one personally so my info is second hand......most ppl across the brands use a valve cover port.
I always run about 10 inches of vacuum and pull it from the valve covers. Never had any issues and empty the overflow tank every 4-5 passes. I have a vacuum pump on my new build and it's a street car, so we'll see how that plays out. I'm wondering how many miles I can drive it before I'll need to empty it. Street driving vs full on race mode..................
Have a 4 vane on the Skyhawk Pulling from the L valve cover with a regulator in the top of the R cover. Have not run the engine yet to know where to set it.
Steve, and planning very similar for my twin turbo project - what brand/model did you go with? Have no experience, but was planning to pull from valve covers, myself
From the front drivers cover on mine ..street driven with some hard blasts .I will get a tablespoon of oil when driven hard .
10-12 is probably OK. 18-20 would be trouble...... from what I've been told. I run a GZ Motorsports pump. It's design is similar to the oem style pumps and is rated for street duty.
Yup, have been using and installing GZ Motorsports pumps since the early 2000's.. Always get some oil out, one thing you want to have is a moroso pickup.. https://www.summitracing.com/parts/...Zh6_OHcQM4cqEcmkNJnKlzWXujJuo3nMaAo7VEALw_wcB Works well in our unbaffeled valve covers.. If he just has an open AN fitting, this will slow the oil consumption down considerably. I have picked it up from the valley before (PCV hole in intake), and even with shielding, you get a lot of oil at that location.. On that particular motor, we moved it to a valve cover, and it cut the oil in the overflow about in half.. about a tablespoon in 2-3 passes. The current setup I am working with does consume a fair amount of oil, and has all the right fittings, and still uses maybe a tablespoon per pass. Working on upper end oil control on that one, before we get into slowing down the oil being sucked out.. it may cure itself. Yes, 10-12 inches is the sweet spot, don't worry about the pins, the real isssue is what it does to the oil pressure, in a wet sump application. We tried higher vacuum levels, with minimal improvement. JW
I did the same acouple years ago and ran 7 inches of vacuum. Sucked the oil away from the pickup and burned up the bearings in 4 passes. Lost about a quart of oil too!. I'd look for a adapter to install the regulator right on the pump and bleed it down. My moroso 4 vane pump can suck 25 inches!!
I run 7 inches of vacuum on the 462. Winding it up around 8,000rpm. Dump the tank every pass. Usually about 1/8th of a cup of oil. I drain it every pass as part of the pass notes. Makes it easy to keep track of things. Running a Daily Engineering dry sump also
I always enjoy this article. Not totally relevant to a Bracket engine, but with the emergence of some of the upper end Tomahawks I think there is something to apply. My stock block 505 pulled 12" for years with little to no oil in the overflow. New Tomahawk combo is currently pulling 14" and will deposit a small amount of oil in the overflow. Sealing and oil control are still a "work in progress" and as I progress I intend to try more vacuum in an effort to maximize my results. https://www.yellowbullet.com/threads/more-about-vacuum-pumps.531428/
Hey Steve, I never have a problem with mine and I run it on the street. Although I get the oil operating temp up before I seal the engine and let the vacuum pump do its thing (10-14"), so it doesnt pull oil from the pins when cold. I hardly ever have to empty the catch can. Only drama on the street, is the constant use. I may need to put new seals in it soon. Been on there for 4 years now.
Heard the same thing about oil vacuumed from the pin bushings, if you don't have full floating pins (a small hole EDM'd from the rod journal to the wrist pin) the vacuum (negative pressure) would be pulling from both (all) pin bushing openings in opposite directions. Oil is virtually uncompressible so unless there are air bubbles in the very thin pin oil film, vacuum should not make a difference unless it reduces oil pump pressure squirting and flinging from the crank bearings that oils the pin. Am I thinking right?
As far as pulling oil, I’ve found that having the relief on the pump vs on the engine reduces the flow. You want to draw a vacuum, not move air.
Don't think I'll have an issue with the sump starving for oil. Have a deep aluminum pan and a Peterson R4 pump pulling through a baffled pick up.
This is another opportunity for me to urge everyone....If you have a fast Buick, a data logger is an invaluable tool! Some of these oil control issues can be vaught before damage is done.
After reading above yellow bullet article..I think I had a issue with no atmospheric pressure pushing or allowing oil to enter the pickup.?
I have been using an older Star pump for several years. It's regulated at the pump so there is no air circulating through the motor. I pull off of the driver front valve cover, pull a reading from the passenger valve cover. I get very little oil per pass. The only time I get more than normal oil it's because I have lost the seal in the motor. Like loose valve covers, loose filler cap or the line for the gauge being loose. This is the fitting that use in the valve cover. https://www.starvacuumpumps.com/img/dyn/supplements/STR.06.11.001 BAFFLE INSTRUCTIONS.pdf
