Re: Switch from 10-30 to 20-50 pressure change?
[Re: Hemi ragtop]
#1659132
08/15/14 12:59 AM
08/15/14 12:59 AM
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Joined: Mar 2006
Posts: 9,858 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,858
MI, usa
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Quote:
I have been fighting oil usage in a 2d gen HEMI for over 2,500 miles. The first suggestions were intake sealing. With the help of Proformance gaskets, I am confident that the intake is sealed. Still I have oil usage, (one quart in 100 miles). The funny thing is, my buddies don't see oil smoke while following me, the pipes and plugs are a light tan. While at the Nats, I talked to several "celebrity" engine builders and several HEMI owners. The consensus is: change from 10-30 to 20-50 oil. I have been using Brad Penn. One owner told me that 18 YEA,RS AGO he changed to 20-50 and has not had a usage problem since.
Does anyone have any input on a HEMI that is just driven? My engine is set up with "loose" clearances, forged pistons, Teflon seales etc.
If You're using a quart every 100 miles no oil in the world is going to help. If there are no external leaks it's burning in the cylinders. Intake to head,guides/seals,rings, hole in the intake port. 100 miles per qt is not a normal situation. Put some dye in the oil. Then I'd pull the intake and have a look. Lets see the plugs. Doug
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Re: Switch from 10-30 to 20-50 pressure change?
[Re: Hemi ragtop]
#1659135
08/15/14 10:27 AM
08/15/14 10:27 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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Anything in the intake track will disperse the oil over all the cyls... when you let off the pedal the vac goes up and pulls the oil back into the intake and will dump it in all the cyls and can make it look like there is very little signs of oil.. I had a hole in a intake runner and it pulled a qt of oil in 35 miles and dumped it out both pipes... the muffs had a lot of oil in them
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Re: Switch from 10-30 to 20-50 pressure change?
[Re: MR_P_BODY]
#1659136
08/16/14 10:52 PM
08/16/14 10:52 PM
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Joined: Mar 2010
Posts: 984 Tennessee
Hemi ragtop
OP
super stock
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OP
super stock
Joined: Mar 2010
Posts: 984
Tennessee
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Update: when I changed from 10/30 to 20/50 my cold pressure went from 80 to 85lb. Not much, but, when HOT, it went from 25-30 idle, to 45. And it went from 60 hot on the freeway to 75. So that answers that. As several on here pointed out, thicker oil, DID NOT IMPROVE THE OIL CONSUMPTION! I paid a lot of good money for a "professional. brand name" engine builder to screw it together. He wanted me to switch to 20/50 and so I tried it. Now I will do what I should have done, I will teart the #$&& engine out of the car and build it myself. I have NEVER, in dozens of engines, including BLOWN HEMI'S had an oil problem. I drove 70 miles to a car show today and used TWO QUARTS of oil! So, here is the plan, the bushed lifter bores are getting drilled! the "expert" refused to do it. 200 lb cranking pressure is too much! there goes the wimpy 248/254 @ 050 solid roller cam! I am thinking that the Mopar aluminum heads have to go. 540 ci. needs the new Eddy or Indy 420 cfm heads with decent valve guides and seals. What about gapless rings which the "expert" refused to use? We have a 4.375 bore, 4.500 stroke, Stage V intake, two 750 cfm Hollys to work with. Car weighs 4,175 lb., 727 w/ 3.54 gear Dana and is used for street driving. What suggestions do you have for the new build?
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Re: Switch from 10-30 to 20-50 pressure change?
[Re: MR_P_BODY]
#1659139
08/17/14 10:05 AM
08/17/14 10:05 AM
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Joined: Mar 2010
Posts: 984 Tennessee
Hemi ragtop
OP
super stock
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OP
super stock
Joined: Mar 2010
Posts: 984
Tennessee
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Quote:
Anything in the intake track will disperse the oil over all the cyls... when you let off the pedal the vac goes up and pulls the oil back into the intake and will dump it in all the cyls and can make it look like there is very little signs of oil.. I had a hole in a intake runner and it pulled a qt of oil in 35 miles and dumped it out both pipes... the muffs had a lot of oil in them
I understand that and it makes sense, yet the pipes are dry, plugs light brown and dry. I wonder if the compression, MSD and 50/50 race gas mix could burn that much oil to the point that I don't see it?
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