Oil Pressure
01-02-2017 | 09:38 PM
#12
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Joined: Apr 2005
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From: Northport N.Y.
01-02-2017 | 10:12 PM
#13
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Joined: Mar 2009
Posts: 1,758
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From: OFallon,Mo.
I am running this https://www.summitracing.com/parts/sme-2015 bypass eliminator on the block with this spin on adapter. https://www.summitracing.com/parts/trd-1050
if you look, the left hole on the spin on adapter does not line up with the center hole. I wonder if switching adapter setups would help. maybe to this? https://www.summitracing.com/parts/ctr-22-592/overview/
if you look, the left hole on the spin on adapter does not line up with the center hole. I wonder if switching adapter setups would help. maybe to this? https://www.summitracing.com/parts/ctr-22-592/overview/
01-02-2017 | 10:40 PM
#14
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Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
Where are you taking your pressure reading?
What size oil lines going to the cooler and back to block?
Years back, my engines would max out at 50psi oil psi when up and running warmed up..would actually drop from 50 to about 45 above 5000rpm. Previous owner had rigged the oil system, full of hard 90* brass fittings, a canton screen type canister filter, then to a standard remote filter -8 lines, it was a mess of plumbing. Got rid of all that, ran -12 lines from block to cooler and back to block, mike tkach shimmed the pump bypass spring, and have 75-80psi up and running hot.
Icdedppl had similar issues. He was getting like 70-80psi reading at his filter head. But at the main galley oil plug, he was getting about 15-20psi less than that . Previous owner had ran -12 lines from block to filter, then -10 lines from filter to cooler and back to filter. He replaced them with -12 , and voila, no longer had the pressure loss at the main oil galley.
The pump is going to bypass based on the psi the pump sees. The pressure the pump sees, may not always be , the psi your gauge sees.
What size oil lines going to the cooler and back to block?
Years back, my engines would max out at 50psi oil psi when up and running warmed up..would actually drop from 50 to about 45 above 5000rpm. Previous owner had rigged the oil system, full of hard 90* brass fittings, a canton screen type canister filter, then to a standard remote filter -8 lines, it was a mess of plumbing. Got rid of all that, ran -12 lines from block to cooler and back to block, mike tkach shimmed the pump bypass spring, and have 75-80psi up and running hot.
Icdedppl had similar issues. He was getting like 70-80psi reading at his filter head. But at the main galley oil plug, he was getting about 15-20psi less than that . Previous owner had ran -12 lines from block to filter, then -10 lines from filter to cooler and back to filter. He replaced them with -12 , and voila, no longer had the pressure loss at the main oil galley.
The pump is going to bypass based on the psi the pump sees. The pressure the pump sees, may not always be , the psi your gauge sees.
01-03-2017 | 04:39 AM
#15
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Posts: 14,154
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From: On A Dirt Floor
01-03-2017 | 04:25 PM
#17
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Joined: Oct 2012
Posts: 896
Likes: 38
From: Buffalo NY
Joe, I bought a stock Merc 500hp carb oiling setup. I got the cooler, non-thermostatic filter housing, and all lines off a buddy's 500hp when he upgraded. I didn't use the block adapter as his was GEN5, mine is mark4.
I have the pressure sending unit in the block and the oil temp sending unit in the filter head. The hoses and block adapter all have 1/2"npt. The hose seems to be the same diameter as 1/2" npt fittings, however the fittings on the cooler are 90* and slightly smaller. I assumed it would all be fine since its all stock 525sc/500hp stuff.
I don't know if it matters. I have the oil going though the cooler then the filter. Maybe the pressure drop would be less if the hot oil went through the filter then the cooler. That way the thinner hot oil would go through the filter easier than cooled oil. My oil temp is just a touch under 140 at cruise and 150 WOT.
I have the pressure sending unit in the block and the oil temp sending unit in the filter head. The hoses and block adapter all have 1/2"npt. The hose seems to be the same diameter as 1/2" npt fittings, however the fittings on the cooler are 90* and slightly smaller. I assumed it would all be fine since its all stock 525sc/500hp stuff.
I don't know if it matters. I have the oil going though the cooler then the filter. Maybe the pressure drop would be less if the hot oil went through the filter then the cooler. That way the thinner hot oil would go through the filter easier than cooled oil. My oil temp is just a touch under 140 at cruise and 150 WOT.
Where are you taking your pressure reading?
What size oil lines going to the cooler and back to block?
Years back, my engines would max out at 50psi oil psi when up and running warmed up..would actually drop from 50 to about 45 above 5000rpm. Previous owner had rigged the oil system, full of hard 90* brass fittings, a canton screen type canister filter, then to a standard remote filter -8 lines, it was a mess of plumbing. Got rid of all that, ran -12 lines from block to cooler and back to block, mike tkach shimmed the pump bypass spring, and have 75-80psi up and running hot.
Icdedppl had similar issues. He was getting like 70-80psi reading at his filter head. But at the main galley oil plug, he was getting about 15-20psi less than that . Previous owner had ran -12 lines from block to filter, then -10 lines from filter to cooler and back to filter. He replaced them with -12 , and voila, no longer had the pressure loss at the main oil galley.
The pump is going to bypass based on the psi the pump sees. The pressure the pump sees, may not always be , the psi your gauge sees.
What size oil lines going to the cooler and back to block?
Years back, my engines would max out at 50psi oil psi when up and running warmed up..would actually drop from 50 to about 45 above 5000rpm. Previous owner had rigged the oil system, full of hard 90* brass fittings, a canton screen type canister filter, then to a standard remote filter -8 lines, it was a mess of plumbing. Got rid of all that, ran -12 lines from block to cooler and back to block, mike tkach shimmed the pump bypass spring, and have 75-80psi up and running hot.
Icdedppl had similar issues. He was getting like 70-80psi reading at his filter head. But at the main galley oil plug, he was getting about 15-20psi less than that . Previous owner had ran -12 lines from block to filter, then -10 lines from filter to cooler and back to filter. He replaced them with -12 , and voila, no longer had the pressure loss at the main oil galley.
The pump is going to bypass based on the psi the pump sees. The pressure the pump sees, may not always be , the psi your gauge sees.
Last edited by 79formula; 01-03-2017 at 04:40 PM.
01-03-2017 | 04:42 PM
#18
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Joined: Oct 2012
Posts: 896
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From: Buffalo NY
I have the same cooler and lines as this engine. My filter is non-thermostatic.
http://www.offshoreonly.com/forums/a...0-pics-010.jpg
http://www.offshoreonly.com/forums/a...0-pics-010.jpg
