How do you choose what size hose to use when installing things like an oil cooler or...
11-06-2002, 05:37 AM
#1
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How do you choose what size hose to use when installing things like an oil cooler or...
doing a filter relocation?
Is there a rule of thumb for doing this? Does the larger hose (10AN) result in a larger pressure drop? I have a cooler installed with 8AN hose, but am going to be doing some additional work and want to get it right.
Thanks,
Scott
Is there a rule of thumb for doing this? Does the larger hose (10AN) result in a larger pressure drop? I have a cooler installed with 8AN hose, but am going to be doing some additional work and want to get it right.
Thanks,
Scott
11-06-2002, 05:44 AM
#2
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What setup did you get?
I got some stuff from summit, but I think it's way too big. I'd imagine 8an would be fine, shouldn't be much pressure drop at all unless there's a leak. I'd also go with airequip lines, too, once you know all the lengths.
IF you had the chance to do it again, would you? I'm wondering if I'll even do mine.
Oil cooler setup for sale! =)
IF you had the chance to do it again, would you? I'm wondering if I'll even do mine.
Oil cooler setup for sale! =)
11-06-2002, 05:51 AM
#3
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Re: What setup did you get?
I installed a Setrab slimline cooler using all Aeroquip hose and connectors. I built the mounting brackets myself.
I would definitely do it again but would probably go with an even larger cooler. My oil temp was running at a constant 250 and is now running between 225 and 230.
Scott
I would definitely do it again but would probably go with an even larger cooler. My oil temp was running at a constant 250 and is now running between 225 and 230.
Scott
11-06-2002, 06:05 AM
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cool. maybe mine will get put on someday.....heres a pic ....
<center><img src="http://pictureposter.audiworld.com/21967/pa120008.jpg"></center><p>of the stock intercooler and the oil cooler that might get installed.....
11-06-2002, 06:15 AM
#6
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Re: cool. maybe mine will get put on someday.....heres a pic ....
<ul><li><a href="http://www.audionline.com/audi12v/mods/engine/oilcooler.htm">Here's a picture of mine before securing all of the hoses.</a></li></ul>
11-06-2002, 06:16 AM
#7
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Re: did you change you block thermostat yet?
I don't think I'm going to do anything with the block cooler, but I am going to add a separate thermostat for the cooler. I haven't done it yet, but am gathering the parts now.
Scott
Scott
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11-06-2002, 08:20 AM
#8
Is it me or do those lines seem a tad small? If you have the equipment,
you can measure the before oil pressure (8mm plug on the other side of the oil pressure switch) and a T fitting after the oil cooler just to make sure the added pipes didn't restrict and drop the pressure.
11-06-2002, 09:46 AM
#9
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I should be able to perform a test like this.
I have two pressure gauges so I think all I'll need to do is buy some adapters to make everything fit.
From a theroretical standpoint, which would result on the greatest loss of pressure...larger ID hose or smaller ID hose? In other words, is it possible to get hose that ends up being too big?
Thanks for the suggestion.
Scott
From a theroretical standpoint, which would result on the greatest loss of pressure...larger ID hose or smaller ID hose? In other words, is it possible to get hose that ends up being too big?
Thanks for the suggestion.
Scott
11-06-2002, 10:23 AM
#10
Both will drop pressure, but the larger one will just cause a pressure build up deIay. Let me...
explain using pipes as an example
Let's say we have a straight pipe carrying a fluid at a particular volume and the receiving end is a bunch of manifolds to smaller pipes (like the oil cavities in the engine). So at this distribution area, there is expected to be a certain pressure such that all small pipes will get distributed properly.
At the beginning of the straight pipe, there is a pump constantly pumping fluid at a fixed flow rate. For this example, imagine this straight pipe is evenly matched to the pump such that the straight pipe doesn't restrict the pump - so no pressure build up at the outlet of the pump - if the receiver end is disconnected and open. Remember, the pressure at the manifold end is due to the fact there is restriction in the area as the fluid tries to flow into all the different small pipes and volume is constantly being pumped in.
Ok, hope you got that picture..
So now, here are the two scenarios. First we add a small hose between the pump and the straight pipe. The small hose will now restrict the pump - and the pump which was designed to pump in a fixed amount of volume per unit time, will be heavily loaded as it tries to jam all that volume through the small hose. The net effect is a higher pressure at the outlet of the pump. The volume passed the small hose into the pipe may still be the same, maybe a slightly higher temp. So the pressure at the manifold area may still be the same or slightly lower than before. If the hose is small enough, the pump will surge - reverse flow - meaning the loaded pump cannot pump in any higher pressure to combat the restriction. So, the volume going to the straight pipe drops and the pressure at the manifold end drops. And worst, the pump will break.
Now we add a large hose (larger than pipe of course) instead. What we did is we just increased the initial volume requirement of the system. So as the pump starts to pump, the volume first has to fill the larger hose, then eventually will fill the straight pipe and as the volume fills the entire area at a longer time, then eventually, pressure will build up from the manifold area which of course eventually pressurizes the whole plumbing all the way to the outlet of the pump. So, the result is a delay in pressure increase, a delay in flow to the smaller pipes. What this added delay is can be calculated by the new volume added by the large pipe vs the flow rate of the pump.
Ok, I'm babbling, but I hope you get the idea.
Here's another point to ponder. I first measured the oil pressure of the engine and I was getting anywhere from 40 to over 80 psi depending on rpm. Then, I found a small VW CIS fuel injector hose from the junckyard of about 2.5mm opening to feed my turbo. The pressure I was getting is between 8 to 16 psi (rpm dependent). A bit too low since I want to target 20-30 psi max. This is not a straight correlation of above because my oil feed is T'd off the main oil path.
Let me know if that helped
Let's say we have a straight pipe carrying a fluid at a particular volume and the receiving end is a bunch of manifolds to smaller pipes (like the oil cavities in the engine). So at this distribution area, there is expected to be a certain pressure such that all small pipes will get distributed properly.
At the beginning of the straight pipe, there is a pump constantly pumping fluid at a fixed flow rate. For this example, imagine this straight pipe is evenly matched to the pump such that the straight pipe doesn't restrict the pump - so no pressure build up at the outlet of the pump - if the receiver end is disconnected and open. Remember, the pressure at the manifold end is due to the fact there is restriction in the area as the fluid tries to flow into all the different small pipes and volume is constantly being pumped in.
Ok, hope you got that picture..
So now, here are the two scenarios. First we add a small hose between the pump and the straight pipe. The small hose will now restrict the pump - and the pump which was designed to pump in a fixed amount of volume per unit time, will be heavily loaded as it tries to jam all that volume through the small hose. The net effect is a higher pressure at the outlet of the pump. The volume passed the small hose into the pipe may still be the same, maybe a slightly higher temp. So the pressure at the manifold area may still be the same or slightly lower than before. If the hose is small enough, the pump will surge - reverse flow - meaning the loaded pump cannot pump in any higher pressure to combat the restriction. So, the volume going to the straight pipe drops and the pressure at the manifold end drops. And worst, the pump will break.
Now we add a large hose (larger than pipe of course) instead. What we did is we just increased the initial volume requirement of the system. So as the pump starts to pump, the volume first has to fill the larger hose, then eventually will fill the straight pipe and as the volume fills the entire area at a longer time, then eventually, pressure will build up from the manifold area which of course eventually pressurizes the whole plumbing all the way to the outlet of the pump. So, the result is a delay in pressure increase, a delay in flow to the smaller pipes. What this added delay is can be calculated by the new volume added by the large pipe vs the flow rate of the pump.
Ok, I'm babbling, but I hope you get the idea.
Here's another point to ponder. I first measured the oil pressure of the engine and I was getting anywhere from 40 to over 80 psi depending on rpm. Then, I found a small VW CIS fuel injector hose from the junckyard of about 2.5mm opening to feed my turbo. The pressure I was getting is between 8 to 16 psi (rpm dependent). A bit too low since I want to target 20-30 psi max. This is not a straight correlation of above because my oil feed is T'd off the main oil path.
Let me know if that helped