Vac pump destruction / mystery

joespanova · 05-29-2016, 08:53 AM

Ya' know............I've had more oil starvation problems in the last few years than probably 10-20 guys combined.
Lost 2 engines in 15 years....meaning blocks and some other hardware.
Even now , with my new Dart block , the main AND rod bearings look like sheeeot........... Nothing is damaged but the bearings will have to be replaced. I currently have a new Lunati crank.........this is no cheapo' either.
The one common denominator in every engine has been the vac pump.
I currently use a STD. volume "Moroso" melling OEM style pump ( modified by Moroso ) and a new pan. But it doesnt matter what I use.......I still have oiling problems.
Bearing clearances are .0025- .003 ( thats not per side , thats total ).
The vac pump with the regulator "out of the box" regulated down to the lowest setting still pulls 15" in high gear thru the lights. I've read on other web sites " Yellow Bullet" where plenty of guys are running 18-20 inches ( all wet sumps ) and not having issues. External pumps , accumulators......I have no idea......but I don't believe they all are. How they are getting away with that is beyond me.
Soooo............the vac pump must go. Its effectiveness ( if any ) is being waaay over shadowed by the destruction it causes. If I drop it down to say 10 inches......I would be just as well off using crankcase vents.Super Stock engines can't even use them.........apparently they innovate some creative PVC system .......but I was concerned that would introduce some oil into the intake.......so , I'm not doing that. RPM range is 87-8800.
Can I hear some opinions on this ?

05-29-2016, 08:53 AM	#1
joespanova Senior Member Join Date: Jun 2011 Location: Ga. Posts: 521 Likes: 7 Liked 13 Times in 11 Posts	Vac pump destruction / mystery Ya' know............I've had more oil starvation problems in the last few years than probably 10-20 guys combined. Lost 2 engines in 15 years....meaning blocks and some other hardware. Even now , with my new Dart block , the main AND rod bearings look like sheeeot........... Nothing is damaged but the bearings will have to be replaced. I currently have a new Lunati crank.........this is no cheapo' either. The one common denominator in every engine has been the vac pump. I currently use a STD. volume "Moroso" melling OEM style pump ( modified by Moroso ) and a new pan. But it doesnt matter what I use.......I still have oiling problems. Bearing clearances are .0025- .003 ( thats not per side , thats total ). The vac pump with the regulator "out of the box" regulated down to the lowest setting still pulls 15" in high gear thru the lights. I've read on other web sites " Yellow Bullet" where plenty of guys are running 18-20 inches ( all wet sumps ) and not having issues. External pumps , accumulators......I have no idea......but I don't believe they all are. How they are getting away with that is beyond me. Soooo............the vac pump must go. Its effectiveness ( if any ) is being waaay over shadowed by the destruction it causes. If I drop it down to say 10 inches......I would be just as well off using crankcase vents.Super Stock engines can't even use them.........apparently they innovate some creative PVC system .......but I was concerned that would introduce some oil into the intake.......so , I'm not doing that. RPM range is 87-8800. Can I hear some opinions on this ? Last edited by joespanova; 05-29-2016 at 08:56 AM.