Need some thoughts on oil pressure after Johnson 2110 install
02-12-2017, 08:13 PM
#1
Need some thoughts on oil pressure after Johnson 2110 install Little background car is an 06 LS2 Corvette with 27k miles.
Modifications include headers, Fast 102, and a 223/231 camshaft which have been installed since 17k miles.
I started thinking about six months ago to add a set of TFS 220 cylinder heads. Bought the heads and began collecting other components gaskets etc...
Pulled the topend of the engine apart last Sunday, and order a new set of Johnson 2110 from BTR.
Lifters arrived on Wednesday and began putting everything back together. Got the cam on base circle and measured for PR length and verified wipe pattern of the new Harland Sharp rockers.
My measurements were quite confusing......7.360" 7.375". The recommended preload for the 2110 is .035" which would equate to a 7.400" PR which is what was installed with the original LS2 lifters and 243 heads.
Installed the 7.400" PR and buttoned everything back up. Cranked the car and began to refill the coolant system. Got the coolant burped and filled correctly only to notice the oil PSI sitting at 24psi hot 210 degrees coolant temp.
The oil pressure has always been 45-48psi on startup and drops to a low of 35psi hot.
Changed the oil and filter with the normal 10/30 Castrol Synthetic Edge.
Cranked the car and the oil psi cold was 40psi and once up to operating temperature dropped to 24-25psi. The oil pressure increases with throttle to around 42-48psi depending. On the highway cruising today I saw 1500rpm and 31psi.
The only thing that changed was the lifters and less preload.
Any thoughts on why the pressure has dropped?
Modifications include headers, Fast 102, and a 223/231 camshaft which have been installed since 17k miles.
I started thinking about six months ago to add a set of TFS 220 cylinder heads. Bought the heads and began collecting other components gaskets etc...
Pulled the topend of the engine apart last Sunday, and order a new set of Johnson 2110 from BTR.
Lifters arrived on Wednesday and began putting everything back together. Got the cam on base circle and measured for PR length and verified wipe pattern of the new Harland Sharp rockers.
My measurements were quite confusing......7.360" 7.375". The recommended preload for the 2110 is .035" which would equate to a 7.400" PR which is what was installed with the original LS2 lifters and 243 heads.
Installed the 7.400" PR and buttoned everything back up. Cranked the car and began to refill the coolant system. Got the coolant burped and filled correctly only to notice the oil PSI sitting at 24psi hot 210 degrees coolant temp.
The oil pressure has always been 45-48psi on startup and drops to a low of 35psi hot.
Changed the oil and filter with the normal 10/30 Castrol Synthetic Edge.
Cranked the car and the oil psi cold was 40psi and once up to operating temperature dropped to 24-25psi. The oil pressure increases with throttle to around 42-48psi depending. On the highway cruising today I saw 1500rpm and 31psi.
The only thing that changed was the lifters and less preload.
Any thoughts on why the pressure has dropped?
02-13-2017, 07:50 AM
#2
TECH Enthusiast
That is what I have on mine and I have the Johnson 2116 lifters. Hot idle about 24 and at 5,000 rpm about 55 psi. I am wondering if the lifters have less restriction thus decreasing the oil pressure. The rpm the more pressure.
02-13-2017, 11:45 AM
#4
TECH Enthusiast
Unfortunately do not have a good before and after for you as I did a motor change. The key will be that you get 10 psi per thousand in pressure. Do some tests at 4,5, and 6 thousand.
02-13-2017, 04:16 PM
#6
Lifters could be looser in their bores causing less of a restruction. Could be the OPSU was damaged during the head swap. I would probably verify the oil pressure with a mechanical gauge, then cut open the oil filter to verify that there isn't any bearing material in the filter element. If there isn't, I'd just run it as is and check the filter again at the next oil change.
02-13-2017, 05:47 PM
#7
Unfortunately I didn't measure the bores, but based on my professional knowledge all of the lifters had a nice snug slip fit to each bore.
I'm going to try a 7.425" pushrod to increase the preload to .055" -.065" just for sake of my sanity.
Could there not be enough preload which is causing bleedoff?
I'm going to try a 7.425" pushrod to increase the preload to .055" -.065" just for sake of my sanity.
Could there not be enough preload which is causing bleedoff?
Trending Topics
02-14-2017, 05:06 PM
#8
I've been in conversation with Randy at Johnson.
So far nothing to draw a conclusion on other than what's been mentioned. Lifter to Bore clearance.
Again it's not really the fact that 25psi is going to cause an issue, but rather why the drop in pressure.
So far nothing to draw a conclusion on other than what's been mentioned. Lifter to Bore clearance.
Again it's not really the fact that 25psi is going to cause an issue, but rather why the drop in pressure.
02-14-2017, 11:54 PM
#9
TECH Fanatic
Join Date: Aug 2009
Location: Coast of San Mateo County Between Pacifica & HMB
Posts: 1,815
Received 215 Likes
on
128 Posts
LS Engines is 7lbs per 1000 RPM. On the corvette forum
it has Been reported that Johnson Axle Oiled Lifters
Consistently drop 5-10 Lbs pressure @ Hot Idle.
This is likely do to increased oil volume to lifters.
I trust consistent Hot idle @ 20 lbs & 50 Lbs
@ 7000 RPM Hot, with a top tier Synthetic Oil.
I use AMSOIL.
Ported stocker or upgraded oil pumps are a good
Idea being careful not to go to far on pump size
So as not to pump pan dry with extended high
RPM (think 1 mile or 1 1/2 mile events) 30
Seconds or longer WOT.
02-15-2017, 06:15 AM
#10
Actually GM Minimum Oil Pressure specification for
LS Engines is 7lbs per 1000 RPM. On the corvette forum
it has Been reported that Johnson Axle Oiled Lifters
Consistently drop 5-10 Lbs pressure @ Hot Idle.
This is likely do to increased oil volume to lifters.
I trust consistent Hot idle @ 20 lbs & 50 Lbs
@ 7000 RPM Hot, with a top tier Synthetic Oil.
I use AMSOIL.
Ported stocker or upgraded oil pumps are a good
Idea being careful not to go to far on pump size
So as not to pump pan dry with extended high
RPM (think 1 mile or 1 1/2 mile events) 30
Seconds or longer WOT.
LS Engines is 7lbs per 1000 RPM. On the corvette forum
it has Been reported that Johnson Axle Oiled Lifters
Consistently drop 5-10 Lbs pressure @ Hot Idle.
This is likely do to increased oil volume to lifters.
I trust consistent Hot idle @ 20 lbs & 50 Lbs
@ 7000 RPM Hot, with a top tier Synthetic Oil.
I use AMSOIL.
Ported stocker or upgraded oil pumps are a good
Idea being careful not to go to far on pump size
So as not to pump pan dry with extended high
RPM (think 1 mile or 1 1/2 mile events) 30
Seconds or longer WOT.
04-10-2017, 09:54 PM
#17
Teching In
Join Date: May 2016
Location: Kentucky
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
just curious did your ever figure out the cause for the drop in pressure? I'm about to install these lifters and planned on running a stock (new) LS6 style pump and running standard Mobil 1 5w-30. Seems some people are having better luck with thicker oils when running the 2110s though. Just curious as to how the lifters are working out for you now.
04-10-2017, 10:29 PM
#18
They are slow leakdown lifters correct? Would that have any bearing on the oil pressure? Especially at idle?
The axle-oiling lifters, like the 2126SLR that I have are definitely going to drop oil pressure. I run a ported LS4 and still see hot of 40psi with 5W30.
The axle-oiling lifters, like the 2126SLR that I have are definitely going to drop oil pressure. I run a ported LS4 and still see hot of 40psi with 5W30.
04-11-2017, 03:12 AM
#19
04-11-2017, 08:20 AM
#20
I wanted to offset the 16 oil leaks that the lifters represent. I've seen a lot of people lose a lot of pressure with them.
Plus I had thought about running a Moroso pan and remote oil filter setup. I'm not as sold on that now. But you definitely want more volume for an external oil filter/oil cooler setup.
I have an Improved Racing setup I'm going to install instead and that should help with windage and oil control. So I feel like sucking the pan dry would be a low probability.
Plus I had thought about running a Moroso pan and remote oil filter setup. I'm not as sold on that now. But you definitely want more volume for an external oil filter/oil cooler setup.
I have an Improved Racing setup I'm going to install instead and that should help with windage and oil control. So I feel like sucking the pan dry would be a low probability.