Expected vs Acceptable presssure loss

[Rick Parker]

with a high volume oil pump on a 289 I have approx 65-70 lbs
of hot oil pressure with 15/40 Kendall GT oil. Recently I purchased from you the FIA oil cooler. With this cooler installed utilizing #10 lines and a remote filter installed what loss pressure can I expect.

Thanks
Rick

[Bob Putnam]

I was kinda hoping that someone else would stick their (more experienced) neck out here...

My guess is that you'll get a 10-15 psi drop through the system when cold and a 5-10 psi loss when hot. Of course you'll have cooler (and thicker) oil when hot, so you may not see as much drop on the gage.

[Dominik]

Rick,

if the pump is capable enough it may hold the oil at the same pressure as before. The pump is regulated by the pressure valve.
It has it's reserves.

If it was at the limit already a drop of 10 psi (hot) is acceptable.
There may be no drop at cold, because the pump is bypassed anyway at the preset value of 70 psi, which would be exceeded at cold anyway.

Just do not use L-shaped (Earl's?) fittings to move aroung 90° or Banjos (at the cooler), better use 90° curved bends.
The L-shapes create a bigger loss and the oil tends to cavitate, because the flow is not laminar.

The old saying was: you loose 10 psi per 10 feet of lining, and 10 psi per 90° "L" and 10 psi in the cooler?.
(10 feet of oil lines, plus 4 fittings, plus cooler = 60 psi loss???)

What has been your result?

Dominik

[Bob Putnam]

Dominik,

We do better than that (of course ).

[Dominik]

Bob,
of course, I should have known it ... - 45° bends!
That is probably posted on your site as well.



Great site, who designed it anyway?

Dom

[Bob Putnam]

Dom,

Actually, there was no good picture of the oil cooler on the site until about 10 minutes ago. If nothing else, we can react fast, 'cause I do it all right here... (Help!)

[Dominik]

Bob,
that was fast indeed:

grab the digi camera (are the batteries loaded?), where is the chip?
find a car!
take a pic (correct light, distance?)
head to the computer (it was on)
hook up the camera cable
download
find the pic on the computer
upload ...

(took me almost 10 minutes to write this ...)

I learned from Rick that we have to wait for a while until he's got some results. He only has to powder coats various chassis parts before the is back on the road again...

Dom

[Bob Putnam]

Dom,

You forgot:

Edit pictures

Add picture to options web page

Edit index.web page to include picture

Edit other web page with new dash pictures

Actually all that took about an hour.

I've got it worked out so that I download the pictures on another computer while I do the html work - saves a few minutes anyway.

Back to making wiring harnesses. Our guy has been working OT at his regular job (loosely connected to the Trade Center thing) so we're fallin' behind.

[Dominik]

Wirig harness ...

Been there, done it, got the t-shirt.
I built those for GM's prototype cars (pre-production) in 1986 when I was 22.

Very nice, clean job! But you should have seen the one of my 2nd car built in 93.
"Oh, I do that real quick and fix it up later - it worked so it stayed that way.
The saying is: the carpenter has the worst furniture.

Dominik

[Dominik]

Plumbers nightmare?
Not very neat, but winners in their fields.

You should have seen the oil cooler / filter side ...

[Bob Putnam]

Holy Cow! That setup must do everything but change the oil automatically every 3000km! What is the function of the two tanks?

[Dominik]

Bob,
the bigger one is obviously the dry-sump tank.
The lines connected to the middle ssection are the return lines from the oil pump. The lower one is the feed line to the engine.

The second tank collects the vent lines from engine and dry sump tank. The long line leading to the rear is open.

Don't ask me why two lines on the top lead to the smaller tank.
Maybe there was just a vacant fitting...


BTW, Peter uses two engine oil coolers.

Dominik

[Bob Putnam]

Dom,

Thanks for the description. The vent tank had me confused. I would normally keep the vent tank above everything else to prevent constant drain-down from the vapors into it.

[Dominik]

Well,
I shall call Peter to find out, but one thing is for sure:
there is no room to place it higher ...

I check anyway.

Dominik