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Re: Blue exhaust smoke when engine reaches max temp
[Re: g-man70]
#3075961
09/10/22 01:32 AM
09/10/22 01:32 AM
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Joined: Aug 2003
Posts: 43,163
Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Sounds like you have a oil ring not sealing.
How many spark plugs are oily? which ones?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Blue exhaust smoke when engine reaches max temp
[Re: PhillyRag]
#3076004
09/10/22 09:56 AM
09/10/22 09:56 AM
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Joined: Jan 2003
Posts: 10,714
North Dakota
6PakBee
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I Live Here
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North Dakota
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Blue smoke from both banks or just one?
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Blue exhaust smoke when engine reaches max temp
[Re: g-man70]
#3076013
09/10/22 11:03 AM
09/10/22 11:03 AM
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Joined: Jan 2003
Posts: 10,714
North Dakota
6PakBee
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I Live Here
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North Dakota
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Intake manifold gasket leak.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Blue exhaust smoke when engine reaches max temp
[Re: g-man70]
#3076048
09/10/22 01:09 PM
09/10/22 01:09 PM
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Joined: Jan 2003
Posts: 15,355
Omaha Ne
TJP
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I Live Here
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Omaha Ne
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I just installed Holley Sniper EFI, new aluminum intake, and headers on my 440 that has 750 miles on it. Engine fired right up, but when it gets to max temp 185-190, it starts blowing blue smoke from the exhaust. Any thoughts on what would cause this? There also appears to be oil dripping at the header collector flange. When I replaced the headers, I installed a fresh set of plugs and noticed that they had oil on them. I checked the PCV valve and it's good. I'm planning to do a compression check on all of the cylinders next but thought I'd check here the mean time. Oil on the outside or on the inside of the the plug? on a few or all 8 118-129 on compression seem a bit low depending on your combination? Did you have this issue before? if not I would suspect the intake/ valley pan I would also see how much blow-by the motor is putting out when hot at idle, and when throttling it keep us posted
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Re: Blue exhaust smoke when engine reaches max temp
[Re: TJP]
#3076058
09/10/22 01:56 PM
09/10/22 01:56 PM
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Joined: Feb 2006
Posts: 54
Franksville, WI
g-man70
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Franksville, WI
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oil was on the inside of the plugs, on all 8
Last edited by g-man70; 09/10/22 01:57 PM.
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Re: Blue exhaust smoke when engine reaches max temp
[Re: g-man70]
#3076086
09/10/22 04:34 PM
09/10/22 04:34 PM
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Joined: Aug 2003
Posts: 43,163
Bend,OR USA
Cab_Burge
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I Win
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Bend,OR USA
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I would remove the intake manifold and intake valley pan and then set the intake on the heads and use a set of feeler gauges to see how much clearance you have on all four corners between intake and the heads at the top and bottom of all four corners, write those clearances down and share them with us. As already mentioned, you may have an issue with the valley and intake not sealing up tight against the heads allowing oil to be suck into the intake manifold runners from the cam valley and the intake valley pan  scope: I've had that issue more than once with both B and RB as well as 426 Hemi motors: whiney: The good news is it is fixable, and you may learn something new with this problem    BTW, fixing the oiling issue will help your motor make more POWER  
Last edited by Cab_Burge; 09/10/22 04:35 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Blue exhaust smoke when engine reaches max temp
[Re: stumpy]
#3076191
09/10/22 11:35 PM
09/10/22 11:35 PM
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Joined: Jan 2003
Posts: 10,714
North Dakota
6PakBee
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I Live Here
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With that much oil in every cylinder, where else can it be coming from? Oil dripping from the header collector flange, that is a LOT of oil. Can't be the valve guides. Unless there was some kind of gross assembly error, can't be the oil rings with an engine that only has 750 miles on it. The OP said he checked the PCV and it is functioning, so...... Without knowing what CR and cam the engine has, those compression numbers may not be out of line. Not everyone is running 13.5:1, LOL!
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Blue exhaust smoke when engine reaches max temp
[Re: 6PakBee]
#3076208
09/11/22 12:44 AM
09/11/22 12:44 AM
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Joined: Feb 2006
Posts: 54
Franksville, WI
g-man70
OP
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OP
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Franksville, WI
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When I installed the headers, I replaced the plugs and there was evidence of oil, but it didn't blow blue smoke like it does now. I was told the motor was rebuilt to stock specs but the idle seems a bit rough for a stock cam. Another symptom is low vacuum, about 12-13 inhg at idle. Here are some video links of it idling and a rev that shows some of the blue smoke. Idle w/carbIdle w/EFIQuick Rev
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Re: Blue exhaust smoke when engine reaches max temp
[Re: g-man70]
#3076216
09/11/22 02:17 AM
09/11/22 02:17 AM
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Joined: Jan 2003
Posts: 21,507
N.E. OHIO, USA
A12
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 21,507
N.E. OHIO, USA
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I just installed Holley Sniper EFI, new aluminum intake, and headers on my 440 that has 750 miles on it. Engine fired right up, but when it gets to max temp 185-190, it starts blowing blue smoke from the exhaust. Any thoughts on what would cause this? There also appears to be oil dripping at the header collector flange. When I replaced the headers, I installed a fresh set of plugs and noticed that they had oil on them. I checked the PCV valve and it's good. I'm planning to do a compression check on all of the cylinders next but thought I'd check here the mean time. If you have 750 miles on the engine and didn't have the smoking issue to that point and you have it now AFTER you installed a new (different) intake manifold I would agree with those members that say "intake" gasket or something related to the new intake manifold. Can't see how headers would create an oil burning issue being downstream of the combustion chambers. Overly rich condition could foul (wet) the spark plugs but the exhaust would either be black or whiteish smoke not blue like oil smoke. All of the valve stem seals couldn't have gone bad at the same time and that can be checked by running it up in the RPM and quickly backing off and your rear-view mirror will let you know if they are bad. Did you just switch from a break-in oil to a full synthetic oil?
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