BIG (IMO) Hemi Problems.
#1579526
02/15/14 10:34 PM
02/15/14 10:34 PM
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Joined: Apr 2008
Posts: 1,141
Phoenix,Az.
hemicop
OP
super stock
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OP
super stock
Joined: Apr 2008
Posts: 1,141
Phoenix,Az.
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SO I fired up the Hemroid today & immediately it didn't sound right. No wonder---- I had oil coming out the driver's side collector! Now I'm kind of a pessimist, so I'm figuring I got BIIIG issues, probably rings, that is going to force me to pull the motor & get it fixed.
However, I haven't done anything yet, so anyone want to take a guess what it is? I have a pan-evac system on it, & a full exhaust system but I can't imagine it having that much of a detrimental effect on it. Could the pan-evac actually be sucking THAT much to cause this? If so can anyone recommend a vacum pump/mount system that'll work on a Hemi with a motorplate?
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Re: BIG (IMO) Hemi Problems.
[Re: hemicop]
#1579527
02/15/14 10:40 PM
02/15/14 10:40 PM
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Joined: Oct 2004
Posts: 5,620
long island NY
Ari440
master
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master
Joined: Oct 2004
Posts: 5,620
long island NY
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Iv seen a deverter vavle go bad and exhast pumping into the motor ,lots of blow by
take the hoses off and see if theres presure
1.39 9.85 - 137 mph
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Re: BIG (IMO) Hemi Problems.
[Re: hemicop]
#1579529
02/15/14 10:50 PM
02/15/14 10:50 PM
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Joined: Oct 2004
Posts: 5,620
long island NY
Ari440
master
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master
Joined: Oct 2004
Posts: 5,620
long island NY
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I have a pan-evac system on it, & a full exhaust system this is not a good idea ,back pressure could blow the valves out too for the street have the hose off to the side and plug the valves up 
1.39 9.85 - 137 mph
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Re: BIG (IMO) Hemi Problems.
[Re: hemicop]
#1579531
02/15/14 11:22 PM
02/15/14 11:22 PM
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Joined: Oct 2004
Posts: 5,620
long island NY
Ari440
master
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master
Joined: Oct 2004
Posts: 5,620
long island NY
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yes pull the breathers off and try to blow thougth them ,if there clogged up , carb spray/ breakcleen them sometime the screan mesh might be too much and the motor don't breath good 
1.39 9.85 - 137 mph
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Re: BIG (IMO) Hemi Problems.
[Re: hemicop]
#1579534
02/16/14 02:24 AM
02/16/14 02:24 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Pull the E-vac tubes for testing...if you have 5"HG or more the E-vac will NOT work... a E-vac will pull a MAX of 5"hg so if your exhaust has greater than 5"hg of back pressure it will back up in the E-vac and burn out the check valve and start to pressurize the crank case.... MOST guys never test the back pressure on their cars and have no idea what it is...if its a real good system it may have less than 5"hg BUT for every inch of back pressure you reduce the draw on the engine by that same amount up to that 5"hg... all these people on here that say NEVER USE IT WITH EXHAUST have never tested their own car.. yes it didnt work on their car so it cant work on any is their GUESS EDIT Back to your problem... pull the plugs on that bank and see if they are oil soaked.... very well could be the intake isnt sealed and its sucking oil in on that bank
Last edited by MR_P_BODY; 02/16/14 02:29 AM.
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Re: BIG (IMO) Hemi Problems.
[Re: hemicop]
#1579536
02/16/14 04:23 AM
02/16/14 04:23 AM
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Joined: Aug 2010
Posts: 167
mi
dirty magnum
member
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member
Joined: Aug 2010
Posts: 167
mi
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Quote:
SO I fired up the Hemroid today & immediately it didn't sound right. No wonder---- I had oil coming out the driver's side collector! Now I'm kind of a pessimist, so I'm figuring I got BIIIG issues, probably rings, that is going to force me to pull the motor & get it fixed.
However, I haven't done anything yet, so anyone want to take a guess what it is? I have a pan-evac system on it, & a full exhaust system but I can't imagine it having that much of a detrimental effect on it. Could the pan-evac actually be sucking THAT much to cause this? If so can anyone recommend a vacum pump/mount system that'll work on a Hemi with a motorplate?
most vac pumps work on a plate like star,aerospace, moroso
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Re: BIG (IMO) Hemi Problems.
[Re: dirty magnum]
#1579538
02/16/14 11:59 AM
02/16/14 11:59 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
most street mufflers restrict to much , ive seen the intake pan gasket blow right up like a balloon, p body you talk so much on the flow , did you test it threw the full power band under a load , don't over think it . use common sense.
I put in over 400 hours testing it at work on the
dyno up to peak power... with full exhaust of different
types down to just headers... I do have a clue about it
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Re: BIG (IMO) Hemi Problems.
[Re: hemicop]
#1579540
02/16/14 11:09 PM
02/16/14 11:09 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Good to hear.... do you have baffles in the valve covers... when/if you run a e-vac you need real good baffles and in a low oil area... I usually put them over the second rocker shaft hold down at the front... like I said before... if you have over 5"hg back pressure you dont want to use the e-vac
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Re: BIG (IMO) Hemi Problems.
[Re: MR_P_BODY]
#1579541
02/16/14 11:25 PM
02/16/14 11:25 PM
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Joined: Aug 2010
Posts: 167
mi
dirty magnum
member
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member
Joined: Aug 2010
Posts: 167
mi
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Quote:
Quote:
most street mufflers restrict to much , ive seen the intake pan gasket blow right up like a balloon, p body you talk so much on the flow , did you test it threw the full power band under a load , don't over think it . use common sense.
I put in over 400 hours testing it at work on the
dyno up to peak power... with full exhaust of different
types down to just headers... I do have a clue about it
your story . back to the op glad it worked out for you 
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Re: BIG (IMO) Hemi Problems.
[Re: dirty magnum]
#1579542
02/16/14 11:31 PM
02/16/14 11:31 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
most street mufflers restrict to much , ive seen the intake pan gasket blow right up like a balloon, p body you talk so much on the flow , did you test it threw the full power band under a load , don't over think it . use common sense.
I put in over 400 hours testing it at work on the
dyno up to peak power... with full exhaust of different
types down to just headers... I do have a clue about it
your story . back to the op glad it worked out for you
Why the "your story"... I worked in the exhaust lab
at Chrysler for 35 years.... why should I BS you..
I just like the FACTS to be put out there... not a
guess
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Re: BIG (IMO) Hemi Problems.
[Re: Ari440]
#1579544
02/17/14 01:21 AM
02/17/14 01:21 AM
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Joined: Dec 2007
Posts: 12,592
Great Neck,LI,new york
hemi-itis
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 12,592
Great Neck,LI,new york
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I also had a bad e-vac valve,pressurized the crank case and was blowin the breather off the valve cover. Switched to 2 puke tanks,problem went away with no oil in the puke tanks.
HEMI-ITIS has no cure.
My condition is fully BLOWN!!
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I don't run a pan evac under any racing conditions, let alone a street car with closed exhaust 
, replaced the plugs & all looks good! Thanks to those that provided the info to chase down a problem I, quite honestly, never encountered before. The car's still not perfect but at least it doesn't resemble the Exxon/Valdez........
