High crankcase pressure 440
#2660888
05/31/19 11:05 AM
05/31/19 11:05 AM
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Joined: Sep 2004
Posts: 523
Right here
HP2
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mopar
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OP
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Joined: Sep 2004
Posts: 523
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Need some advice from the panel here!
Low comp 440, Hughes whiplash cam and springs, nice bores with cross pattern visible, haven’t taken the pistons out- trusted sellers words it was tight and healthy. First startup blew rear main seal. Second the valley pan and found the old pcv valve was shot. Had then problems getting the Mopar performance valve covers to seal.
On with a pair of stocks from the replaced 400” and a new pcv and valley pan. Pcv connected to 3/8” under carb, hose from the other side hanging loose. New startup. Adjusting new street Demon carb and setting ignition with vacuum gauge. Everything looking okay. Everything tight, no oil leaking anywhere.
First careful test ride and oil stick came out. Noticed some blueish smoke too.
Tied oilstick with zip tie but it snapped when I stepped on it. Runs like a king. New valley pan starts to blow up too...
Blowby from poorly sealing rings (or too big gap) or can I have missed something?
70 W100 Power Wagon. 318 4-spd
70 Sport Fury 440 2dr HT
71 Duster 340
71 Charger Super Bee - 383/727
72 Charger "Sabotage" - 440/727 - Street/Strip
78 Warlock in beautiful patina
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Re: High crankcase pressure 440
[Re: HP2]
#2660892
05/31/19 11:14 AM
05/31/19 11:14 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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blowby & a wrong/damaged/inop PCV will exacerbate it. Start with a leakdown. EDIT good point on the head gasket, I would do a compression test first.
Last edited by RapidRobert; 05/31/19 11:15 AM.
live every 24 hour block of time like it's your last day on earth
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Re: High crankcase pressure 440
[Re: Dunnuck Racing]
#2660894
05/31/19 11:18 AM
05/31/19 11:18 AM
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Joined: Sep 2004
Posts: 523
Right here
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Last one I had a similar experience with was a pushed out head gasket into the valley pan area That could be a reason! Have used steel gaskets to bump up compression a bit but couldn’t find copper spray
70 W100 Power Wagon. 318 4-spd
70 Sport Fury 440 2dr HT
71 Duster 340
71 Charger Super Bee - 383/727
72 Charger "Sabotage" - 440/727 - Street/Strip
78 Warlock in beautiful patina
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Re: High crankcase pressure 440
[Re: HP2]
#2660968
05/31/19 02:24 PM
05/31/19 02:24 PM
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Joined: Jan 2003
Posts: 1,908
Nebraska
4406bbl
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,908
Nebraska
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Need some advice from the panel here!
Low comp 440, Hughes whiplash cam and springs, nice bores with cross pattern visible, haven’t taken the pistons out- trusted sellers words it was tight and healthy. First startup blew rear main seal. Second the valley pan and found the old pcv valve was shot. Had then problems getting the Mopar performance valve covers to seal.
On with a pair of stocks from the replaced 400” and a new pcv and valley pan. Pcv connected to 3/8” under carb, hose from the other side hanging loose. New startup. Adjusting new street Demon carb and setting ignition with vacuum gauge. Everything looking okay. Everything tight, no oil leaking anywhere.
First careful test ride and oil stick came out. Noticed some blueish smoke too.
Tied oilstick with zip tie but it snapped when I stepped on it. Runs like a king. New valley pan starts to blow up too...
Blowby from poorly sealing rings (or too big gap) or can I have missed something? My bet if it is not a head gasket is busted ring lands on cast pistons as it sounds like you are having crankcase explosions. Tear it down before you damage the bores. Never trust anyone that sells you an engine you can't hear run, even crate motors in a crate, I have learned the hard way and end up in a mess with my name trashed for finding the problem every time.
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Re: High crankcase pressure 440
[Re: 4406bbl]
#2660975
05/31/19 02:59 PM
05/31/19 02:59 PM
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Joined: Sep 2004
Posts: 523
Right here
HP2
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mopar
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OP
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Joined: Sep 2004
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Just did a compression test. From 127 to 135 psi on all.
One odd notice is that all plugs on drivers side are black from soothe but all plugs on passengers side looks normal brownish
Weiand dual plane intake, tti headers, 2.5” exhaust, MSD distr w/ vacuum advance
70 W100 Power Wagon. 318 4-spd
70 Sport Fury 440 2dr HT
71 Duster 340
71 Charger Super Bee - 383/727
72 Charger "Sabotage" - 440/727 - Street/Strip
78 Warlock in beautiful patina
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Re: High crankcase pressure 440
[Re: HP2]
#2661030
05/31/19 07:46 PM
05/31/19 07:46 PM
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Joined: Jan 2003
Posts: 15,350
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,350
Omaha Ne
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Just did a compression test. From 127 to 135 psi on all.
One odd notice is that all plugs on drivers side are black from soothe but all plugs on passengers side looks normal brownish
Weiand dual plane intake, tti headers, 2.5” exhaust, MSD distr w/ vacuum advance A compression test can be misleading as it will not tell you what the rings are doing under load (Combustion). Sounds like your issue is probably on left (drivers) side. A leak down test may help but it's only going to confirm what you already know. Its tear down time IMO 
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Re: High crankcase pressure 440
[Re: TJP]
#2661076
05/31/19 10:39 PM
05/31/19 10:39 PM
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Joined: Nov 2003
Posts: 1,881
Pittsburgh,PA
RTSrunner
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,881
Pittsburgh,PA
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A compression test can be misleading as it will not tell you what the rings are doing under load (Combustion). Sounds like your issue is probably on left (drivers) side. A leak down test may help but it's only going to confirm what you already know. Its tear down time IMO [/quote] True on both points,but a leak down test will usually give you a direction and some issues are not visible to the naked eye & hopefully narrows the search!
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Re: High crankcase pressure 440
[Re: RTSrunner]
#2661124
06/01/19 08:37 AM
06/01/19 08:37 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Do the testing first (comp/leakdown) THEN tear it down. Good record keeping/baseline will never steer you wrong/be a waste of time. Holler how it turns out.
live every 24 hour block of time like it's your last day on earth
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Re: High crankcase pressure 440
[Re: HP2]
#2661194
06/01/19 12:10 PM
06/01/19 12:10 PM
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Joined: Aug 2003
Posts: 43,161
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,161
Bend,OR USA
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Last edited by Cab_Burge; 06/01/19 12:11 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: High crankcase pressure 440
[Re: Cab_Burge]
#2661196
06/01/19 12:24 PM
06/01/19 12:24 PM
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Joined: May 2019
Posts: 6,241
nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,241
nowhere
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You need to lean down the primaries on the side of the carb. that feed the dark colored plugs On a dual plane intake the primary feeds two cylinders on each side. On a single plane, they both feed all 8. Only time I ever ran into all plugs on one side being "dark" was an intake leak.
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Re: High crankcase pressure 440
[Re: Sniper]
#2661200
06/01/19 12:32 PM
06/01/19 12:32 PM
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Joined: Jan 2003
Posts: 15,350
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,350
Omaha Ne
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You need to lean down the primaries on the side of the carb. that feed the dark colored plugs On a dual plane intake the primary feeds two cylinders on each side. On a single plane, they both feed all 8. Only time I ever ran into all plugs on one side being "dark" was an intake leak.  
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Re: High crankcase pressure 440
[Re: RapidRobert]
#2661252
06/01/19 03:56 PM
06/01/19 03:56 PM
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Joined: Sep 2004
Posts: 523
Right here
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Update:
Must have been a stuck piston ring. Now it runs normal. Did a few short test drives, very carefully to start with and then a few tire melters later crank case pressure suddenly seems to be normal.
It runs like a king 🤴 with the Hughes Whiplash cam! 💪
The 833 all the sudden feels very close ratio even with 3.23 😄
Will tune the carb and timing a little more and then new plugs.
There can still be a little issue with not perfectly sealing rings but now it’s summer so if it continues running like now I’ll dig into it later.
Thanks all for your support 🙏🤗
70 W100 Power Wagon. 318 4-spd
70 Sport Fury 440 2dr HT
71 Duster 340
71 Charger Super Bee - 383/727
72 Charger "Sabotage" - 440/727 - Street/Strip
78 Warlock in beautiful patina
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Re: High crankcase pressure 440
[Re: HP2]
#2661342
06/01/19 08:45 PM
06/01/19 08:45 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I ain't thinking from a stuck ring but if it stays good then you're good. keep us updated.
live every 24 hour block of time like it's your last day on earth
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