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Old 02-03-2010, 09:54 AM   #1
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Default #8 or #10 oil lines to my rx7 cooler?

I have a new rx7 cooler with #8 lines already made. I have #10 lines currently.

I'd try it out, but I have to spend $100 on fittings to get it started.
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Old 02-03-2010, 10:04 AM   #2
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Can you detail the specifics of the sex and position of your fittings/lines? I dont see you'd have to spend $100 on adapter fittings, so I want to clarify.
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Old 02-03-2010, 10:21 AM   #3
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I had about $50 in my fittings for #8, two 90's (wish it was four) four connectors, and two straights.
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Old 02-03-2010, 10:26 AM   #4
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Can you detail the specifics of the sex and position of your fittings/lines? I dont see you'd have to spend $100 on adapter fittings, so I want to clarify.
No, I can't. Now watch your ******* mouth around me.

I guess I could get an ebay adapter plate, ditch the Mocal thermostatic plate, and buy 2 #8 fittings.
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Old 02-03-2010, 10:27 AM   #5
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I had about $50 in my fittings for #8, two 90's (wish it was four) four connectors, and two straights.
Did you find any pressure drop when you added it? I have 260-300* oil temps in the summer on the track so the properly functioning oil cooler may curb any of that.

Last weekend I ran 200* oil temps max and the stock oil pressure gauge never dropped below 60psi, and ran roughly 45-50psi at idle.
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Old 02-03-2010, 10:31 AM   #6
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jesus..45 at idle... have a stock 1.6 and the cooler isn't even exposed to air as I'd probably over cool, I haven't noticed any drop per say in oil pressure. I think somewhere along the lines of 25-30 at idle and up to 50-60 WOT sound about right? my oil temp gauge is in the process of being installed.
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Old 02-03-2010, 10:43 AM   #7
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No, I can't. Now watch your ******* mouth around me.

I guess I could get an ebay adapter plate, ditch the Mocal thermostatic plate, and buy 2 #8 fittings.

or two -8AN unions ($10.73) and then two -10/-8an fittings ($9.95ea). You're at $41 there plus shipping and crap, and that was the first place I looked. that way you should be able to run your -10an lines and just reduce to -8an at the cooler.
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Old 02-03-2010, 11:04 AM   #8
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or two -8AN unions ($10.73) and then two -10/-8an fittings ($9.95ea). You're at $41 there plus shipping and crap, and that was the first place I looked. that way you should be able to run your -10an lines and just reduce to -8an at the cooler.
I'll have to get new hose to run the #10 and still have the restriction on the thermostat...maybe the thermostat is restricting enough that #10 doesn't matter because I doub't the orifice on either thermostat is "#10-big."
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Old 02-03-2010, 11:12 AM   #9
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are we talking about oil coolers or what size hose you think your junk might actually fit in? #10 line is only .625" diameter, lol at your pencil dick.
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Old 02-03-2010, 11:24 AM   #10
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are we talking about oil coolers or what size hose you think your junk might actually fit in? #10 line is only .625" diameter, lol at your pencil dick.
-10 is .57" i.d. I think -8 is 100% fine for delta p. I'll justify in a few.

Edited to add: does anyone know what our op flows?
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Old 02-03-2010, 12:00 PM   #11
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-10 is .57" i.d. I think -8 is 100% fine for delta p. I'll justify in a few.

Edited to add: does anyone know what our op flows?
I'm looking for answers like, "Yes sir Hustleratron, I have #8 lines and I have no oil pressure drop." Or, "No your diving lordship, the #8 lines are too small but you may borrow my girlfriend as a consolation prize." If you dump a bunch of math-**** in this thread I'm going to get confused.
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Old 02-03-2010, 12:12 PM   #12
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Ok, making two sweeping assumptions, without stating any math, the pressure drop for -8 looks like 3.1psi/ft, the pressure drop for -10 would be 0.9psi/ft. Big difference, making the -10 look a bit more attractive. This is with 8 feet of hose and 4 90* ells, total delta p for this setup with the -8 would be 25 psi, -10 would be only 7 psi. This is using 10GPM for pump flow, which I think sounds high.

See the stuff in bold for the important units, and I'll post justifications for the real M.E.s in my next post.
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Old 02-03-2010, 12:20 PM   #13
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No math here.

In every gay color you would like. I had used these briefly when I was running a -10 cooler on my LSX for the 10 minutes it was running. I pulled it to simplify **** when I realized I wouldn't reach ridiculous oil temps:

Braided Stainless Steel Lines

Frank
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Old 02-03-2010, 12:28 PM   #14
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The math for hustlefucker's wall of worry. Halp from real M.E.s appreciated, I only managed 2/3rds of the BS, and that was in 1885.

I used Gates' delta p calculator: Fluid Flow Calculator. As stated, I grabbed 10GPM from some hot rodder websites, common numbers for flow was 8-12GPM. The easy constant on the Gates calculator was specific gravity, from Mobil for 10W-30 it was 0.876: Mobil Clean Motor Oil. The tough constant was viscosity, cP. This, of course, fluctuates immensely wrt temp. The best number I found was here: AMSOIL - 100% Synthetic 10W-30 Motor Oil (ATM), Kinematic Viscosity @ 100C, cSt (ASTM D-445)=10.8. My assumption was that 10.8cSt was equivalent to 10.8cP, is this right? It appears as if centipoise and centistokes convert 1:1. If so, the numbers I came up with were cool for 8' hose, 4X90* ells, oil at 100*C.
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Old 02-03-2010, 12:32 PM   #15
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Originally Posted by webby459 View Post
Ok, making two sweeping assumptions, without stating any math, the pressure drop for -8 looks like 3.1psi/ft, the pressure drop for -10 would be 0.9psi/ft. Big difference, making the -10 look a bit more attractive. This is with 8 feet of hose and 4 90* ells, total delta p for this setup with the -8 would be 25 psi, -10 would be only 7 psi. This is using 10GPM for pump flow, which I think sounds high.

See the stuff in bold for the important units, and I'll post justifications for the real M.E.s in my next post.
Thank you very much for the help.

...paging ARTech!!!
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Old 02-03-2010, 01:31 PM   #16
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Thank you very much for the help.
Hey, n/p. BUT, you were the guy I wanted to talk to: https://www.miataturbo.net/forum/t40819/#post517324, post #30. I am a suffering homo tranny who is menstruating currently. I am frightened of my own shadow, and the shadow of the million+ parts strewn on my garage floor. Halp? Maybe I should move that stuff off that nice man's thread and into my own?

Also, I'll prolly need the IAC settings you pledged me a few months ago. You're using the early tb, right?
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Old 02-03-2010, 02:31 PM   #17
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Old 02-03-2010, 03:53 PM   #18
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In terms of real life data, I run #8 on my little ~8x4 oil cooler and have not seen any noticeable pressure rise. 50-70 at cruise, 30-45 idle. The broad ranges are due to the cold weather. If I blip the throttle right after I start it'll be 90+psi.

Oh, and "driving lordship"? Ha!
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Old 02-03-2010, 03:59 PM   #19
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In terms of real life data, I run #8 on my little ~8x4 oil cooler and have not seen any noticeable pressure rise. 50-70 at cruise, 30-45 idle. The broad ranges are due to the cold weather. If I blip the throttle right after I start it'll be 90+psi.

Oh, and "driving lordship"? Ha!
I'm tempted to try this with your previious results. Must find #8 fittings and start bolting stuff up.

Can I run the two thermostats (one in the plate, one in the cooler" or should I get a non-thermostatic plate for testing?
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Old 02-03-2010, 04:01 PM   #20
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Not pressure rise, pressure drop. I'm stupid and don't know exactly how the sandwich plate works, but if it's parallel with the rest of the oiling system and the pressure drop is high (or higher that the delta p in the rest of the system), the flow through the cooler will be low or nil. Otoh, if the oil has to go through the cooler in order to make it through the rest of the system, the pressure before it goes through the lines and cooler will be greater than the pressure after (obviously). Taken to an extreme, if you use too small a line, you could lose substantial oil pressure if the lines are too small in diameter. I just quantified the theoretical pressure drop based on hose manufacturer's data.
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