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Valley Pan Inverted
#2820504
09/14/20 09:09 AM
09/14/20 09:09 AM
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
FuriousMopar1968
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
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So first a little back story, a while back I was having a little street fun with my boss and had a run with his challenger on an empty highway. I was cruising about 40mph then gave the old girl about a 2/3 throttle blast, it blew the tires loose, and it began immediately walking away from his car revving up to about 6500 RPM 125-130ish MPH. Around that time I felt a little hesitation and an off rhythm, idle cycle then normal, but that had subsided not long after. For the rest of the trip home from work I didn’t think much of it. That is until I got home and did my post trip checks, and saw my Valley pan became a Hill Pan. Naturally, after this discovery I was very confused, still runs great and has a boat load of power. (Literally since it’s a C-Body haha) It sat in storage for a while and I finally was able to get back to starting to diagnose this, but I still come up empty on a cause from the basic external diagnostics I’m able to do in a self storage unit. The car is the build from this post: https://board.moparts.org/ubbthread...-ram-68-fury-build-opinions-welcome.htmlCompression Test Results: 1: 160PSI 3: 165PSI 5: 160PSI 7: 165PSI 2: 155PSI 4: 160PSI 6: 150PSI 8: 165PSI Also no smoke or engine noises heard. Anyone have anything like this happen to them and figure what it was? Also should the car still be driven or am I at risk of losing everything in the engine? Thanks in advance for any and all help. 
Last edited by FuriousMopar1968; 09/14/20 09:11 AM.
1968 Plymouth Fury - 440 Dual Quad Tunnel Ram
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Re: Valley Pan Inverted
[Re: FuriousMopar1968]
#2820568
09/14/20 12:22 PM
09/14/20 12:22 PM
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Joined: Oct 2005
Posts: 268
Anchorage, Alaska
metallicareload
enthusiast
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enthusiast
Joined: Oct 2005
Posts: 268
Anchorage, Alaska
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Had that happen when a few pistons came out in more than 1 piece. Your compression numbers look good to me, so I'd check PCV valve, breather(s), if the breather is big enough, something wrong with the baffles. Anything clogged?
440, 4-Speed, 3.54
1968, when Dinosaurs ruled the Earth
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Re: Valley Pan Inverted
[Re: metallicareload]
#2820595
09/14/20 01:17 PM
09/14/20 01:17 PM
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
FuriousMopar1968
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
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Thanks for the replies, this is how my breather and PVC system is ran. Do you see any red flags of how I set it up? Should I ditch the PVC and just run breathers or maybe even one of those crankcase blow off valves?
Last edited by FuriousMopar1968; 09/14/20 01:18 PM.
1968 Plymouth Fury - 440 Dual Quad Tunnel Ram
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Re: Valley Pan Inverted
[Re: FuriousMopar1968]
#2820599
09/14/20 01:31 PM
09/14/20 01:31 PM
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Joined: Aug 2011
Posts: 2,853
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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Is that a breather or an oil cap on the driver side, still needs more breathers that what you have.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: Valley Pan Inverted
[Re: FuriousMopar1968]
#2820602
09/14/20 01:36 PM
09/14/20 01:36 PM
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Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
ek3
top fuel
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top fuel
Joined: Jun 2012
Posts: 1,899
MYRTLE BEACH SOUTH CAROLINA
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So first a little back story, a while back I was having a little street fun with my boss and had a run with his challenger on an empty highway. I was cruising about 40mph then gave the old girl about a 2/3 throttle blast, it blew the tires loose, and it began immediately walking away from his car revving up to about 6500 RPM 125-130ish MPH. Around that time I felt a little hesitation and an off rhythm, idle cycle then normal, but that had subsided not long after. For the rest of the trip home from work I didn’t think much of it. That is until I got home and did my post trip checks, and saw my Valley pan became a Hill Pan. Naturally, after this discovery I was very confused, still runs great and has a boat load of power. (Literally since it’s a C-Body haha) It sat in storage for a while and I finally was able to get back to starting to diagnose this, but I still come up empty on a cause from the basic external diagnostics I’m able to do in a self storage unit. The car is the build from this post: https://board.moparts.org/ubbthread...-ram-68-fury-build-opinions-welcome.htmlCompression Test Results: 1: 160PSI 3: 165PSI 5: 160PSI 7: 165PSI 2: 155PSI 4: 160PSI 6: 150PSI 8: 165PSI Also no smoke or engine noises heard. Anyone have anything like this happen to them and figure what it was? Also should the car still be driven or am I at risk of losing everything in the engine? Thanks in advance for any and all help. internal pressure from a backfire... seen it happen on a new 440-6 engine back in the 70's seems like it took out the fuel pump best i remember ....
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Re: Valley Pan Inverted
[Re: CSK]
#2820603
09/14/20 01:37 PM
09/14/20 01:37 PM
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
FuriousMopar1968
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New Jersey, U.S.A.
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That’s a breather, where else can you mount them? The Direct Connection covers only have the 1 hole on each side, or do I have to ditch the PCV for a breather, or lose the DC covers for something else?
1968 Plymouth Fury - 440 Dual Quad Tunnel Ram
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Re: Valley Pan Inverted
[Re: ek3]
#2820606
09/14/20 01:40 PM
09/14/20 01:40 PM
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
FuriousMopar1968
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New Jersey, U.S.A.
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Any idea what would of caused the back fire if the cylinders are sealed with decent compression?
1968 Plymouth Fury - 440 Dual Quad Tunnel Ram
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Re: Valley Pan Inverted
[Re: FuriousMopar1968]
#2820608
09/14/20 01:41 PM
09/14/20 01:41 PM
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Joined: Aug 2011
Posts: 2,853
Pattison Texas
CSK
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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That’s a breather, where else can you mount them? The Direct Connection covers only have the 1 hole on each side, or do I have to ditch the PCV for a breather, or lose the DC covers for something else? Pull the breather out & take a picture of the underside for us, & the hole size it goes into
Last edited by csk; 09/14/20 01:41 PM.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: Valley Pan Inverted
[Re: FuriousMopar1968]
#2820618
09/14/20 01:54 PM
09/14/20 01:54 PM
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Joined: Oct 2005
Posts: 268
Anchorage, Alaska
metallicareload
enthusiast
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enthusiast
Joined: Oct 2005
Posts: 268
Anchorage, Alaska
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That’s a breather, where else can you mount them? The Direct Connection covers only have the 1 hole on each side, or do I have to ditch the PCV for a breather, or lose the DC covers for something else? That's basically the same setup I've been using for years, and aside from from what I mentioned above, I've never had any problems
440, 4-Speed, 3.54
1968, when Dinosaurs ruled the Earth
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Re: Valley Pan Inverted
[Re: CSK]
#2820619
09/14/20 01:54 PM
09/14/20 01:54 PM
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
FuriousMopar1968
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New Jersey, U.S.A.
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I’ll try and swing by the unit today and get the pictures. Those pictures are from a while ago, but I’m still running the same layout currently just with one of the extended breathers on it just don’t have recents of that.
Edit: I forgot, I also swapped on an old set of Moroso Valve covers we had lying around for one reason or another. This event was about a year ago and it stopped me from driving it any further until I figured out what happened. So it just sits in the unit until. Lights right off with a turn of the key though when I went back to it this past week. Haha
Last edited by FuriousMopar1968; 09/14/20 03:00 PM.
1968 Plymouth Fury - 440 Dual Quad Tunnel Ram
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Re: Valley Pan Inverted
[Re: CSK]
#2820689
09/14/20 05:03 PM
09/14/20 05:03 PM
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
FuriousMopar1968
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
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That’s a breather, where else can you mount them? The Direct Connection covers only have the 1 hole on each side, or do I have to ditch the PCV for a breather, or lose the DC covers for something else? Pull the breather out & take a picture of the underside for us, & the hole size it goes into Here’s the pics. Thanks for helping me out with this!
1968 Plymouth Fury - 440 Dual Quad Tunnel Ram
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Re: Valley Pan Inverted
[Re: FuriousMopar1968]
#2820692
09/14/20 05:13 PM
09/14/20 05:13 PM
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Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
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Based on those last pics, it’s not vented nearly enough for an extended WOT blast.
There is likely nothing wrong with the motor, it just needs better venting.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Valley Pan Inverted
[Re: FuriousMopar1968]
#2820746
09/14/20 07:24 PM
09/14/20 07:24 PM
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Joined: May 2017
Posts: 65
New Jersey, U.S.A.
FuriousMopar1968
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Just to add more info to the situation here’s how the oil looks, doesn’t smell like gas, it’s still thick, and a proper golden. (The little specks/dots in the picture are air bubbles.) Spark plugs are also model citizens.
1968 Plymouth Fury - 440 Dual Quad Tunnel Ram
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Re: Valley Pan Inverted
[Re: fast68plymouth]
#2820850
09/14/20 10:24 PM
09/14/20 10:24 PM
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Joined: Aug 2011
Posts: 2,853
Pattison Texas
CSK
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Posts: 2,853
Pattison Texas
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Based on those last pics, it’s not vented nearly enough for an extended WOT blast.
There is likely nothing wrong with the motor, it just needs better venting. Yep, I have 3 breathers going to a catch can on my car, no PCV for my set up.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: Valley Pan Inverted
[Re: fast68plymouth]
#2820868
09/14/20 11:10 PM
09/14/20 11:10 PM
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Joined: Nov 2003
Posts: 10,228
Colleyville
3hundred
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,228
Colleyville
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Based on those last pics, it’s not vented nearly enough for an extended WOT blast.
There is likely nothing wrong with the motor, it just needs better venting. Doesn't it seem like the cap would have blown off before the valley pan deflected that way? 
'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
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