Re: New motor with high oil pressure...
[Re: MR_P_BODY]
#973768
04/15/11 02:15 PM
04/15/11 02:15 PM
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Joined: Jul 2008
Posts: 30,486 Florida STAYcation
dOc …
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,486
Florida STAYcation
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JUSTA' thought .... I remember an article in National Dragster some years back written by WJ .... He ran ZERO weight oil at 50 psi max. Running the oil pump UP as high as you do costs HOESpower !
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Re: New motor with high oil pressure...
[Re: dOc …]
#973769
04/15/11 02:44 PM
04/15/11 02:44 PM
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Joined: Jan 2003
Posts: 10,019 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,019
Frostbitefalls MN (Rocky&Bullw...
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Don't forget that what keeps the bearings happy is the "wedge" of oil that separates the journal from the bearing. Too light of an oil mixed with too big of a clearance and you have a rod stuck through the block. Not a good deal. For us do it yourselfers, 20w50 and larger clearances make the most sense. pull the pan and set the pump properly, or run the risk of bearing failure. To ease the process, get a priming rod so you can spin the pump for a test with the pan held with a couple of bolts, then you can put it together the rest of the way when you are happy with the pressure output. A good 3/8 drill will give you full pressure readings.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: New motor with high oil pressure...
[Re: 1976 Aspen]
#973771
04/15/11 03:33 PM
04/15/11 03:33 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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I have the same issue with my 408. After break-in, I went with a full synthetic ( 10-30 Royal Purple ) and droped the pressure by about 15 psi accross the board. Pressure is still a little higher than I would like and I'm sure it's costing my some HP, but I have been running it that way for 3 years now with no problems. Remember, after you get some runs on it the pressure will come down a bit also. IMO, people run too high a viscosity oil in general. Todays lubes are a bunch better than years ago.
Fastest 300
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Re: New motor with high oil pressure...
[Re: Locomotion]
#973773
04/15/11 04:58 PM
04/15/11 04:58 PM
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Joined: Oct 2007
Posts: 3,978 Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Diesel oils have low zinc levels because the trucks now have cats on them just like a car. My last sb race motor a ran 10/30 brad penn and it still had 70 psi cold.
Last edited by 1967DartGT; 04/15/11 04:59 PM.
Brett Miller W9 cnc'd heads STR Chassis fabraction
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Re: New motor with high oil pressure...
[Re: 1967dartgt]
#973774
04/15/11 05:08 PM
04/15/11 05:08 PM
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Joined: Dec 2009
Posts: 20,668 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,668
in a cattle trailer down by th...
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Man you guys need to keep up with the times. I'm running 5W-20 synthetic in my motor. That 20w and 50 weight crap is old, old news.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: New motor with high oil pressure...
[Re: 1976 Aspen]
#973775
04/15/11 11:12 PM
04/15/11 11:12 PM
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Joined: Jun 2010
Posts: 3,112 LONG ISLAND
fishy340
master
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master
Joined: Jun 2010
Posts: 3,112
LONG ISLAND
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Quote:
I put my new mill on the dyno and at idle I have 75 psi and at WOT it goes to 100 psi. I'm running 15W-40 Rotella T in it so I'm thinking about switching to a 5W-30 or something to get it down. I like the Rotella T but they don't make it in a 5W-30 or maybe I should try a synthetic??? It's a 700 HP small block that spins to 7200 rpm's and used on the strip only. It's in the car already and I don't wanna pull it out to mes with the pressure spring either... Any suggestions are greatly appreciated!!!
mine did the same thing vr1 10 30 now its a little high for about a min till motor warms up
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Re: New motor with high oil pressure...
[Re: bigsbigelow]
#973777
04/16/11 01:09 PM
04/16/11 01:09 PM
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Joined: Sep 2009
Posts: 928 NC
SLOW67
super stock
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super stock
Joined: Sep 2009
Posts: 928
NC
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Quote:
Rotella makes a straight 30 and 10w30 oil. Last season I ran the straight 30 and got 80 psi cold and 30 hot at idle. I found 10w30 Rotella this year and just changed my oil with that last week. I am still getting 80 psi cold but hopefully the 10w will help the oil warm up faster. I have also decided to use a bottle of STP with my oil season because I have heard that the zinc levels have also dropped in the Rotella products.
I run rotella in everything including my daily driver but In all my flat tappet stuff I still pour in a bottle of GM EOS
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Re: New motor with high oil pressure...
[Re: 1976 Aspen]
#973779
04/16/11 09:41 PM
04/16/11 09:41 PM
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Joined: Sep 2003
Posts: 6,847 Missouri
StrokerPost
master
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master
Joined: Sep 2003
Posts: 6,847
Missouri
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When I built my 414 with a new Melling pump I had the same issue only much more drastic. The needle on the gage, at WOT, would actually go almost all the way back around to zero! I thought that the gage must have taken a crap so I tried another, but same thing. Switched from the Mobil 1 15/50 to the real thin Royal purple stuff just to see what it would do, and it lost about 20 psi across the board, but still WAY to high. Took the pump out and had my engine guy check it out, even though he had blueprinted, and deburred everything and checked the pressures on his oil pump dyno. Again, it checked fine, all he did was took out the piston and spring, check piston travel, and then lightly hone the piston and bore. I put it back in the motor and again WAY high press? ARG!! So I then just got another Melling pump, had my guy "go over" it and put it in and it was perfect, about 30 psi at idle hot, and 75 at WOT. Why was the other so high? Dunno, but maybe ya just need to try another pump. With the new pump in ET was just over a tenth quicker in the 1/4. Good luck.
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