Best ring pack for pan evac equiped race bb?

Curious how thin a ring pack and what tension can be used with a pan evac system? 512 bigblock bracket motor.

Good question. Hook a pressure sending unit up to your data logger and see what the numbers are. Personally I don't trust a pan evac system to do much of anything. If the engine had a vacuum pump then I'd go with a metric ring pack. We've used the Mahle 1/1/3 mm ring packs and they free up some power that is for sure.

No running motor at this time, just some pistons with .043/.043/3/16 ring pack. I have considered what to do with the megablock that i split a cylinder in. Fix it, or sell it and a potential buyer doesn't use a vacuum pump. The pistons and rings in seven cylinders only have seven runs on them, and could be built pretty reasonably for what he wants if the .043 rings will work.

They'll work with an evac system, just not as well as they would work with a pump.

I bought and used a .043,.043 with a 1/8 inch low tension oil ring for my 518 C.I. 400 block current bracket motor with a vacuum pump
I'm not sure what current trick racing sizes are available now as I built that motor two winters ago
I like it a lot, runs good , makes a lot of power

Check you PMs.

Just food for thought here. My son rebuilt a magnum 360. Ball honed , and a standard forged piston. Im pretty sure 1/16 rings. Your standard moly type off the shelf piston/ring.
He put an evac system on it, and a vac gauge on the valve cover. Of course it produced little to no vacum. I told him get rid of all the rubber gromets etc. He fabbed some alum pucks with the centers tapped for 3/8 pipe. He welded these onto the valve covers. Got some -10 AN fittings and hose and plumbed it to the headers. Then he put one with a check valve to a breather tank so if there was positive pressure it could vent. This AN setup produces some vacum ! At idle the gauge just comes off "0" . At 55mph on the freeway it has 3" of vac. At the track depending on the air it produces 3-4" of vacum at the stripe. I was impressed. The key is sealing up the connections at the valve covers , as much as you can

Great to know! Thanks.

Call or email Total Seal.

They strongly encourage folks to call before they start a project.

https://www.totalseal.com/

This last time I went w/ a .043" top, 1/16" 2nd and 3/16" oil ring on my new pistons. New slugs and fresh bores sure seems to have made this old motor run better.
Fresh motor check-out/break-in pass earlier this year it ran 9.73 at 139.6 mph w/ only a 1.43 sixty foot. This was all motor w/ a real tight nitrous converter and 3.54 gear.

Whose Big Block pistons You use for the 1/1/3mm ring package?

Same Question??: "Whose Big Block pistons You use for the 1/1/3mm ring package?"

I used Diamond.
Doug

i used .9mm .9mm 3mm the pistons are ross


Joe

Thank You for the information.

ICON will also do any ring pack you want.