Twin HPOP oil temp

KBMKVIII · Nov 28, 2015

What temps are you seeing running twin oil pumps?
What degree thermostat are you running?
I'm running the thermostat that came with the dieselsite water pump with filter.
It's the 205 deg and I need to change it back to a lower temp.
Seeing 230-235 solid oil temps after 30-40 min of driving.
New oil cooler.
Before the twin pumps, had the 203 deg thermostat from dieselsite and was seeing 210 deg oil temps.
Just curious to see others findings.

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m j · Nov 28, 2015

could it be the restrictive return path?
can that be drilled out?

Magnum PD · Nov 28, 2015

For him?

What are you talking about?

KBMKVIII · Nov 29, 2015

I don't see it necessary to drill the front cover as many have had twin pumps without issue.
I have run these for a while and I am not having problems, but I remember a few years back reading somewhere, that twin HPOPs increased oil temp significantly.
Using the dieselsite spacer to feed the rear pump and have a secondary resivor feed as well shown in the second pic.
Sorry no up close pic of the secondary feed to the resivor.

Disregard the tty headbolts as it was for mockup before studding.
I'm really wondering what temp thermostat would be best, and what others have seen for oil temps with twin pumps.

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dsberman94 · Nov 29, 2015

OMG!!!! That is the single cleanest engine bay I've ever seen. Nice work. That pic belongs in an art gallery or something.

mandkole · Nov 29, 2015

Not sure that a stat will have much impact to this issue. Is the average temp of the engine oil volume actually that hot or is it a local temp in the res? I know little about twins, but Im thinking about the routing of the oil around the pumps and the location of the sensor. It appears that you are returning worked oil immediately to the res-- is that correct? Wonder what the oil temp is in the pan..

KBMKVIII · Nov 29, 2015

The oil supply to the res is coming from the oil gallery from the side of the block.

I will check with my infared thermometer to see if there is a large difference between the pan temp and res temps tomorrow once i drive it 70 mi to work.

And thanks berman, its a work in progress.

mandkole · Nov 29, 2015

KBMKVIII said:
The oil supply to the res is coming from the oil gallery from the side of the block.

Ok thanks, I learned something--I thought there was a more local supply. If its coming from below, hmm, it may be very similar then.

Curious to see what the IR says now.. Ive never seen that kind of differential.

KBMKVIII · Nov 29, 2015

Just for discussion sake how hot of oil is too hot?

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Magnum PD · Nov 29, 2015

My Banks oil temp gauge says when it gets over 240

Jomax · Nov 29, 2015

My 6.7 hits 252 towing up the hills in he summer.

I've hit 240 towing heavy with the 7.3 in the summer.

This is all 105+ degree weather sometimes 112+

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m j · Nov 29, 2015

is the IPR returning to rez rather then pan?
looks like single IPR, factory passage is not used

KBMKVIII · Nov 29, 2015

Its returning to the front cover where it drains back down to the pan.

Feed for the second pump is coming from the drivers side of HPOP spacer, return to the pass side of the HPOP spacer.

Yes single ipr.

cjfarm111 · Nov 29, 2015

I have kinda the same issue with just my t500 single pump. When towing heavy I will see 230-240. I was the was a way to lower that nimber

KBMKVIII · Nov 29, 2015

Honestly it would be easy to add an external air to oil cooler in line with my existing reservoir feed.
But I would much rather find out the average increase of oil temp when adding a second oil pump.

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PSD POWER007 · Nov 29, 2015

cjfarm111 said:
I have kinda the same issue with just my t500 single pump. When towing heavy I will see 230-240. I was the was a way to lower that nimber

Even when I tow heavy, my oil temps NEVER get over 220-222 degrees. And that's down here in the SE heat and humidity and pushing the truck pretty hard.

mandkole · Nov 29, 2015

If I'm not towing, at cruise, it's 190ish

KBMKVIII · Nov 29, 2015

When I reached 210-220 with a single pump I was either towing heavy or riding it hard for extended periods of time.

Now its 230-235 at 75 cruise.

m j · Nov 29, 2015

is there a balance line between the two pumps?
I see the IPR in the DS pump but not a passage from the front pump to a control device in those pics

KBMKVIII · Nov 29, 2015

Yes there is.
Not shown in previous pics.
Thanks for pointing that out.

Hard to see but I had a line made with ample radius to clear all hardware while retaining bend radius within hose specs of operational limits.
Things get real tight when all together.

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