Update; low oil pressure problems.
#2549878
09/14/18 09:50 AM
09/14/18 09:50 AM
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gregsdart
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My 528 Megablock motor lost a lot of oil pressure after installing a new rollercam , oil through the pushrod Isky EZ roll lifters and pushrods with very large holes( .050+). Pressure was 40 psi on the gauge in the traps with 10 inch of vacuum, so actual was about 45 psi. I sent the pushrods back and had them restricted to .040. That didn't show a lot of improvement at all. So my guess is the Isky lifters are partly to blame, having a reputation of being a bit undersized from what i hear. I installed a Milodon pump with the five lobe configuration and that brought it up to 50 psi on the gauge, or about 55 to sixty in the traps. The bypass was shimmed till it shows 80 psi cold at startup. The block is bronze bushed, with .062 hole for oil to the lifters. I run Vr1 20w50 oil. Single line pickup system. Still not wildly happy with this deal. Any thoughts?
Last edited by gregsdart; 09/14/18 09:52 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2549890
09/14/18 10:36 AM
09/14/18 10:36 AM
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ZIPPY
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I can't help but wonder what the lifter to bore (or bushing bore)clearance is, if they felt loose during assembly, and so on.
Rich H.
Esse Quam Videri
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2549897
09/14/18 10:55 AM
09/14/18 10:55 AM
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gregsdart
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Zippy, they didn't feel loose, so i assume they were no more than .0015 small, likely. Cold 20w50 probably hid any extra clearance well. If i pull it apart again i will measure the lifters and bushing bores. The pushrod situation has me bummed. Having to buy new intake pushrods in 7/16 versus 1/2 inch due to different lifter offset, sending them all back to restrict them to .040,etc i have over $1,000 into pushrods alone. Like they say, speed costs money, how fast do you want to go? Well, i am about as fast as i can afford
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2549908
09/14/18 11:30 AM
09/14/18 11:30 AM
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fast68plymouth
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.062 holes in the bushings are huge....... as are the .040 in the pushrods.
.020 is plenty big.
Did you check to see how much leakage is coming out around the lifters at full lift while priming?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2549930
09/14/18 12:18 PM
09/14/18 12:18 PM
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fast68plymouth
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To put it in perspective........ if you run the external lines on the Indy heads to feed a set of needle bearing rockers(like Harland Sharps), and you go from the unrestricted fittings that have the smallest portion of the internal passages at .120” diameter, and put one .060” restrictor in each side, the oil pressure in the motor goes up about 10psi. Even with the .060” restrictor in place, when I prime a motor with Indy heads and the external lines there is a ton of oil coming to the top end.
Greg has 4 times as many .060” sized feed holes going to the top end as what I normally use.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2549934
09/14/18 12:41 PM
09/14/18 12:41 PM
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dvw
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Mega block, Isky Red Zones, .055" pushrod, .060" bushing hole, .0025"+ lifter bore clearance, 1/8" tall Melling pump, Indy single line cover. The relief spring has enough coils clipped off that it rattles in the pump. Running 5w25 JR1 oil. Even with the clearances this loose, oil pressure is great. I've had it apart after 200 passes for inspection. All good. 40-60psi idle depending on oil temp, 70 psi hot@7000. I did notice the axle feed hole is below the lifter bore bushings at base circle. Doesnt seem to bother it.See attached drawing. Doug
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2549979
09/14/18 02:43 PM
09/14/18 02:43 PM
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gregsdart
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Manton didn't do retrictions less than .040, so i should have checked around before sending them out. I didn't look at the oil going by the lifters. But by the looks of how much is coming out of the pushrods, it is probably plenty. I never thought that a .062 hole in each lifter bore bushing would be a bad deal, since a stock block is often raced with huge holes to the oil galley. If 55 to 60 psi in the traps at 7500 rpm, i'll run it and data log it to compare readings to the gauge.
Last edited by gregsdart; 09/14/18 02:45 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Update; low oil pressure problems.
[Re: dvw]
#2549985
09/14/18 03:07 PM
09/14/18 03:07 PM
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pittsburghracer
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I think after seeing the issues with my son small block I will now be priming every engine I build before I install the intake manifold. Big and small blocks.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2549988
09/14/18 03:17 PM
09/14/18 03:17 PM
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fast68plymouth
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If the hole in the bushings line up with the feed holes in the lifter when the cam is on the base circle, it will pump a ton of oil through the lifters. Depending on how the oil flows through the lifter, it can be totally unrestricted flow. Experienced it myself on a 572 I put together. World aluminum block with the Comp 892 lifters. Primed the motor, and the instant the drill started to drag down when the oil system got pressurized it shot oil out of the top of the Jesel adjuster screws about 15 feet across the shop. I saw that and the thought that popped into my head was, “well........ I guess that’s not going to work”. I never thought that a .062 hole in each lifter bore bushing would be a bad deal, since a stock block is often raced with huge holes to the oil galley. None of the factory lifters for a BB have provisions for pushrod oiling, or ever expose that large opening. If you were running something like the Comp solid body 829’s(I’m not advocating those for your situation) that .062” hole wouldn’t be an issue at all. It make not be an issue now, it just depends on if the hole in the bushing is lined up directly with feed the hole in your lifters or not. Imo, the “correct” arrangement/relationship for pushrod oiling on a BB Mopar is to have the pushrod feed holes in the lifters be parallel with the axles, and positioned just above the oil band. Then the only oil that gets into the feed hole is what squeezes between the lifter bore and the lifter body, into that hole.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Update; low oil pressure problems.
[Re: pittsburghracer]
#2549995
09/14/18 03:24 PM
09/14/18 03:24 PM
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Porter67
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Ive always done that, I really thought everyone did it. I want to see how everything is getting oiled, and also no matter how clean people try to be with clean oil there always seems to be that first shot/hint of slightly discolored oil and since im not really cranking the motor other then to get it fully primed I use a few paper towls to soak iy up out of the lifter vally. Thats why im not big on assembly lube other the on the cam. I think after seeing the issues with my son small block I will now be priming every engine I build before I install the intake manifold. Big and small blocks.
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2549999
09/14/18 03:32 PM
09/14/18 03:32 PM
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Al_Alguire
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IMO .062" restrictor in the bushing is HUGE, like twice as big as needed. Not saying it is your issues just saying that's WAY more oil than needed up top.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Update; low oil pressure problems.
[Re: fast68plymouth]
#2550029
09/14/18 05:13 PM
09/14/18 05:13 PM
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HardcoreB
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To put it in perspective........ if you run the external lines on the Indy heads...(two?)
...Greg has 4 times as many .060” sized feed holes going to the top end as what I normally use. This may be the only time I have 'issue' with something Dwayne said...I'm not sure the math is correct? 4x2is 8 and thee are 16 .062" orifices? So, wouldn't it be "8 times"? While it more emphasis his point of excessive area, the math was wrong? LOL, then maybe I'm off.
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2550032
09/14/18 05:19 PM
09/14/18 05:19 PM
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fast68plymouth
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Nope...... you’re right.
Brain fade on my part........ he has 8 times as many .062” feeds as what I usually run.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2550037
09/14/18 05:33 PM
09/14/18 05:33 PM
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fast68plymouth
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It’s all good Sean 😎
The 8 times larger area emphasizes my point even more!!
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Update; low oil pressure problems.
[Re: pittsburghracer]
#2550047
09/14/18 06:04 PM
09/14/18 06:04 PM
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I think after seeing the issues with my son small block I will now be priming every engine I build before I install the intake manifold. Big and small blocks. This^^^^^^^^^^
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Update; low oil pressure problems.
[Re: gregsdart]
#2550048
09/14/18 06:07 PM
09/14/18 06:07 PM
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I guess the Hippocratic oath doesn't apply to lifter manufacturers. You know, the one that say "above all, do no harm". In this case, it would mean "until you KNOW it can't wreck anything, don't sell it".
Boffin Emeritus
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