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Smokin Hemi... Update. #1628956
06/04/14 11:44 PM
06/04/14 11:44 PM
Joined: Jan 2003
Posts: 1,411
Western NY
Xlr8us Rapidus Offline OP
super gas
Xlr8us Rapidus  Offline OP
super gas

Joined: Jan 2003
Posts: 1,411
Western NY
Alright guys I'm at my wits end. I have a blown 472 Hemi with alum. heads. This winter we pulled the motor for some external oil leaks. We noticed that the rockers were kinda beat up so I bought a set of rollers, replaced the cam and rebuilt the Demon Carbs. Now as soon as it warms up to temp it starts smoking (blue) out the tail pipes. More when I get on it or let up on it. Not as much when just cruising, but still smokes. I thought it was the intake gasket, just replaced that again, still smoking. I don't know where to look next.

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628957
06/05/14 12:56 AM
06/05/14 12:56 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
Circle Track
RapidRobert  Offline
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Joined: Nov 2003
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Lincoln Nebraska
I'd have to say it's still the intake . I dont think the valve seals went south or stem to guide clearance suddenly became too much. A possibility would be an oil ring fubared but k.i.s.s. the worsenening under increasing vac in hg points to the intake. The oil has to be getting sucked into the intake tract somehow. Post how it goes


live every 24 hour block of time like it's your last day on earth
Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628958
06/05/14 03:55 AM
06/05/14 03:55 AM
Joined: Aug 2003
Posts: 43,152
Bend,OR USA
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Cab_Burge Offline
I Win
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Joined: Aug 2003
Posts: 43,152
Bend,OR USA
Which brand of aluminum hemi heads are you using? When you took the motor apart to replace the lifters did you see oil in the intake ports or not? Oil comes into the combustion chamber several different ways, intake gaskets sucking oil, valve guides, rings or maybe sometimes from PCVs I feel for you, I've fought that demon more than once, that is one of the reasons I commonally call them Hemiroids motors, they can be a big pain in the rear smetimes BTW, all the problems are fixable, once you define the problem correctly

Last edited by Cab_Burge; 06/05/14 03:56 AM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628959
06/05/14 08:03 AM
06/05/14 08:03 AM
Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA Offline
I Live Here
DAYCLONA  Offline
I Live Here

Joined: Dec 2007
Posts: 18,157
Mass
Are you pooling any oil inside the plug wells/tubes, oily plugs by chance?

Re: Smokin Hemi... [Re: DAYCLONA] #1628960
06/05/14 08:59 AM
06/05/14 08:59 AM
Joined: Jan 2003
Posts: 1,411
Western NY
Xlr8us Rapidus Offline OP
super gas
Xlr8us Rapidus  Offline OP
super gas

Joined: Jan 2003
Posts: 1,411
Western NY
The old intake didn't look bad, but replaced it with the Mr Gasket better one. If the valve seals were bad wouldn't it smoke at startup? They are Mopar heads. No PCV valve. Seems to be a little oil in the plug wells, but the #2 and #4 plug looked like they were "dipped" in oil! I did have the intake valves replaced also. Did not replace the seals, he told me they were good.

Thanks, Mark

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628961
06/05/14 12:34 PM
06/05/14 12:34 PM
Joined: Jan 2003
Posts: 15,976
Chilliwack B.C. Canada
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RUNCHARGER Offline
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Posts: 15,976
Chilliwack B.C. Canada
Are the studs into the heads sealed properly?

Sheldon

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628962
06/05/14 02:13 PM
06/05/14 02:13 PM
Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA Offline
I Live Here
DAYCLONA  Offline
I Live Here

Joined: Dec 2007
Posts: 18,157
Mass
Quote:

The old intake didn't look bad, but replaced it with the Mr Gasket better one. If the valve seals were bad wouldn't it smoke at startup? They are Mopar heads. No PCV valve. Seems to be a little oil in the plug wells, but the #2 and #4 plug looked like they were "dipped" in oil! I did have the intake valves replaced also. Did not replace the seals, he told me they were good.

Thanks, Mark







Do you have the compression washers on the spark plugs? if so this very well may be your issue, if plugs currently or in the past were installed with the compression washers, the HEMI plug tube has been damaged/distorted and oil is entering the cylinder, seen it before, common mistake, if this is the cause, replace the tubes, and remove the compression washers from the spark plugs, the HEMI tube is your compression "washer"


Mike

Re: Smokin Hemi... [Re: RUNCHARGER] #1628963
06/05/14 02:18 PM
06/05/14 02:18 PM
Joined: Jan 2003
Posts: 1,411
Western NY
Xlr8us Rapidus Offline OP
super gas
Xlr8us Rapidus  Offline OP
super gas

Joined: Jan 2003
Posts: 1,411
Western NY
Quote:

Are the studs into the heads sealed properly?

Sheldon




I used ARP thread sealant on all studs.

Re: Smokin Hemi... [Re: DAYCLONA] #1628964
06/05/14 02:20 PM
06/05/14 02:20 PM
Joined: Jan 2003
Posts: 1,411
Western NY
Xlr8us Rapidus Offline OP
super gas
Xlr8us Rapidus  Offline OP
super gas

Joined: Jan 2003
Posts: 1,411
Western NY
Quote:

Quote:

The old intake didn't look bad, but replaced it with the Mr Gasket better one. If the valve seals were bad wouldn't it smoke at startup? They are Mopar heads. No PCV valve. Seems to be a little oil in the plug wells, but the #2 and #4 plug looked like they were "dipped" in oil! I did have the intake valves replaced also. Did not replace the seals, he told me they were good.

Thanks, Mark






Do you have the compression washers on the spark plugs? if so this very well may be your issue, if plugs currently or in the past were installed with the compression washers, the HEMI plug tube has been damaged/distorted and oil is entering the cylinder, seen it before, common mistake, if this is the cause, replace the tubes, and remove the compression washers from the spark plugs, the HEMI tube is your compression "washer"


Mike




The washers were on there previously, not now.

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628965
06/05/14 02:22 PM
06/05/14 02:22 PM
Joined: Jan 2003
Posts: 1,411
Western NY
Xlr8us Rapidus Offline OP
super gas
Xlr8us Rapidus  Offline OP
super gas

Joined: Jan 2003
Posts: 1,411
Western NY
Also, #4 plug looks snow white!

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628966
06/05/14 02:28 PM
06/05/14 02:28 PM
Joined: Feb 2012
Posts: 4,452
Morristown Tn.
7
71birdJ68 Offline
master
71birdJ68  Offline
master
7

Joined: Feb 2012
Posts: 4,452
Morristown Tn.
Could you all keep talking about this. My motor is smoking also. I have Stage V heads.

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628967
06/05/14 02:32 PM
06/05/14 02:32 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Do a leak down test on the motor next if you haven't already. It's possible that your rings did not seat and you are blowing oil down your valve guides with boost. What kind of seals are you running?

I would run a PCV with properly baffled valve cover on the street with a blower.

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628968
06/05/14 02:35 PM
06/05/14 02:35 PM
Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA Offline
I Live Here
DAYCLONA  Offline
I Live Here

Joined: Dec 2007
Posts: 18,157
Mass
Quote:

Quote:

Quote:

The old intake didn't look bad, but replaced it with the Mr Gasket better one. If the valve seals were bad wouldn't it smoke at startup? They are Mopar heads. No PCV valve. Seems to be a little oil in the plug wells, but the #2 and #4 plug looked like they were "dipped" in oil! I did have the intake valves replaced also. Did not replace the seals, he told me they were good.

Thanks, Mark






Do you have the compression washers on the spark plugs? if so this very well may be your issue, if plugs currently or in the past were installed with the compression washers, the HEMI plug tube has been damaged/distorted and oil is entering the cylinder, seen it before, common mistake, if this is the cause, replace the tubes, and remove the compression washers from the spark plugs, the HEMI tube is your compression "washer"


Mike




The washers were on there previously, not now.






Well chances are the tube bottoms are distorted by the compression washers being on the plugs, so I'd replace the tubes, don't bother trying to reshape the tube base, and install the plugs (new set) without the compression washers, fire it up, clean it out and see if the smoking has stopped, I've seen this very issue over the decades on quite a few HEMIs, common mistake

Mike

Re: Smokin Hemi... [Re: DAYCLONA] #1628969
06/05/14 11:20 PM
06/05/14 11:20 PM
Joined: Jan 2003
Posts: 1,411
Western NY
Xlr8us Rapidus Offline OP
super gas
Xlr8us Rapidus  Offline OP
super gas

Joined: Jan 2003
Posts: 1,411
Western NY
Here's where I stand, I'm pretty sure it's not the intake gasket. Replaced it twice and it looked like it was sealing. With the blower and intake off, the top of #4 valve looks considerably cleaner than the others. I think this also rules out the spark plug tubes. That only leaves valve seal or head bolt. There doesn't seem to be any oil where the head bolt goes into the intake port. So I'm leaning toward valve seal. If I get the spring compressor from Mancini or Detroit City, how much of a pain is this to do with the heads on?

When does this car start to become fun?

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628970
06/05/14 11:36 PM
06/05/14 11:36 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
Quote:

When does this car start to become fun?


Sometimes walking away for 48 hrs works wonders. It'll likely restore the emotions back to a dead calm (or much closer to it) which is needed in the mechanic world. Mr Murphy can be tough to deal with


live every 24 hour block of time like it's your last day on earth
Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628971
06/06/14 08:47 AM
06/06/14 08:47 AM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Quote:

Here's where I stand, I'm pretty sure it's not the intake gasket. Replaced it twice and it looked like it was sealing. With the blower and intake off, the top of #4 valve looks considerably cleaner than the others. I think this also rules out the spark plug tubes. That only leaves valve seal or head bolt. There doesn't seem to be any oil where the head bolt goes into the intake port. So I'm leaning toward valve seal. If I get the spring compressor from Mancini or Detroit City, how much of a pain is this to do with the heads on?

When does this car start to become fun?




Once I took off all the race stuff off my street car, it became fun and way faster!. I know you can't do that with a blower very easy, but that's what I did 10 years ago with my 340 and have really enjoyed it in the last 10 years. It's not stock by any means, just close enough to be reliable and it runs really well with it's 10.5-1 KB pistons, single plane intake and Eddie heads.

Are going to do a leak down before taking anything apart this time, so you know whats wrong?

Re: Smokin Hemi... [Re: Challenger 1] #1628972
06/06/14 01:36 PM
06/06/14 01:36 PM
Joined: Jan 2003
Posts: 1,411
Western NY
Xlr8us Rapidus Offline OP
super gas
Xlr8us Rapidus  Offline OP
super gas

Joined: Jan 2003
Posts: 1,411
Western NY
Quote:



Are going to do a leak down before taking anything apart this time, so you know whats wrong?




Prob will do a compression test this weekend. Valve seals are cheap enough, I just hate to spend $200 for the tool to compress the springs and find out that wasn't the problem.

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628973
06/06/14 02:07 PM
06/06/14 02:07 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
Circle Track
RapidRobert  Offline
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
You might be able to rent one for cheap (an ad on CL could get a response). In addition not sure if a leakdown could pinpoint fubared oil rings or just the compression rings but I would seriously consider locating one/doing a leakdown before tearing it down


live every 24 hour block of time like it's your last day on earth
Re: Smokin Hemi... [Re: RapidRobert] #1628974
06/06/14 03:09 PM
06/06/14 03:09 PM
Joined: Jan 2003
Posts: 1,411
Western NY
Xlr8us Rapidus Offline OP
super gas
Xlr8us Rapidus  Offline OP
super gas

Joined: Jan 2003
Posts: 1,411
Western NY
Thank you to everyone. I'll keep you informed.

Re: Smokin Hemi... [Re: Xlr8us Rapidus] #1628975
06/06/14 03:48 PM
06/06/14 03:48 PM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
Too Many Posts
Challenger 1  Offline
Too Many Posts

Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Quote:

Quote:



Are going to do a leak down before taking anything apart this time, so you know whats wrong?




Prob will do a compression test this weekend. Valve seals are cheap enough, I just hate to spend $200 for the tool to compress the springs and find out that wasn't the problem.




You need to do a leak down to learn any thing, different than compression test.

Spring compressor for use on the head can be fabricated pretty easy at home with no welder in some cases.

Who out there has made there own to post a picture of it. I have made a couple over the years but I used a welder.

Please post your pictures of your homemade compressor to help this guy out.

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