Re: Best ring pack for pan evac equiped race bb?
[Re: AndyF]
#2833961
10/17/20 05:27 PM
10/17/20 05:27 PM
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Joined: Jan 2003
Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...
gregsdart
OP
master
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OP
master
Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
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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.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Best ring pack for pan evac equiped race bb?
[Re: gregsdart]
#2834062
10/17/20 10:07 PM
10/17/20 10:07 PM
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Joined: Aug 2003
Posts: 43,159 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,159
Bend,OR USA
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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
Last edited by Cab_Burge; 10/17/20 10:07 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Best ring pack for pan evac equiped race bb?
[Re: R3 Racing]
#2835688
10/21/20 03:33 PM
10/21/20 03:33 PM
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Joined: Aug 2003
Posts: 4,676 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,676
On the parachute mount
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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
....BAD A$$ STREET CAR.....
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Re: Best ring pack for pan evac equiped race bb?
[Re: n20mstr]
#2835693
10/21/20 03:48 PM
10/21/20 03:48 PM
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Joined: Jan 2003
Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...
gregsdart
OP
master
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OP
master
Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
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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.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Best ring pack for pan evac equiped race bb?
[Re: 340Cuda]
#2835986
10/22/20 09:33 AM
10/22/20 09:33 AM
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Joined: Jan 2003
Posts: 13,363 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,363
Marion, South Carolina [><]
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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.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Best ring pack for pan evac equiped race bb?
[Re: Dduster]
#2845107
11/11/20 09:48 PM
11/11/20 09:48 PM
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Joined: Mar 2006
Posts: 9,835 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,835
MI, usa
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Re: Best ring pack for pan evac equiped race bb?
[Re: Dduster]
#2845148
11/11/20 11:35 PM
11/11/20 11:35 PM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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Same Question??: "Whose Big Block pistons You use for the 1/1/3mm ring package?" i used .9mm .9mm 3mm the pistons are ross Joe
Without Data, you’re just another guy with an opinion.
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