Oil lines
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FJCamper
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Re: Oil lines
Hi, Mlrailguy,
The quality of the crimping depends entirely on the guys who did it.
If, for instance, you worked with a hydraulics shop that makes lines daily, you'd be okay.
But, if you had a local auto parts shop with a seldom-used hose crimper in their toolbox back near the brake lathe and alternator tester, the quality if a definite maybe.
If your real question is can a crimp tool used correctly made for power steering lines or transmission oil coolers hold the pressure from a full flow filter to a filter adapter, yes it can.
3/8 inch ID works for short lines, a couple of feet maybe, but I wouldn't run it any farther than that. Half inch ID can run from one end of the car to the other and back again.
FJC
The quality of the crimping depends entirely on the guys who did it.
If, for instance, you worked with a hydraulics shop that makes lines daily, you'd be okay.
But, if you had a local auto parts shop with a seldom-used hose crimper in their toolbox back near the brake lathe and alternator tester, the quality if a definite maybe.
If your real question is can a crimp tool used correctly made for power steering lines or transmission oil coolers hold the pressure from a full flow filter to a filter adapter, yes it can.
3/8 inch ID works for short lines, a couple of feet maybe, but I wouldn't run it any farther than that. Half inch ID can run from one end of the car to the other and back again.
FJC
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Marc
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Re: Oil lines
The I.D. of an SAE (45° seat) or a AN/JIC (37° seat) fitting can vary, depending upon the method used to attach it to the hose. Different manufacturers may have different dimensions, too - it's not standardized like the hose I.D. ....it's by nature going to be smaller than the nominal hose size.
As Frank said, 3/8" hose (which is approximately the same size as #6 AN) isn't big enough for an external filter setup, you want #8 AN, which has an I.D. of ~½" - and the I.D. of its fittings will be nearly as big. Ideally you will also minimize the use of 45° and 90° elbows, since they can introduce as much restriction as several additional feet of hose.
AN hose sizes can be a little confusing at first:
"The idea behind AN hoses and fittings was to provide a flexible alternative to rigid tubing in plumbing aircraft and military vehicles. Sizes for rigid tubes were already standardized, with sizes called out by tubing OD (3/16", 1/2", etc). AN hose sizes were designed to match the ID sizes of these rigid tubes. Can you see the confusion starting? Tubing is known by OD, but the hoses are sized according to the tubing ID -- not the hose OD or even the hose ID.
AN hose sizes are based on the nominal OD of the tubing with a matching ID. It sounds convoluted, but it really is a simple idea that achieves a logical goal. If hoses were called out using the hose OD (following the same system used for tubing), the ID of a 3/8" hose would be much smaller than the ID of a 3/8" tube. On top of that, different hose types have different wall thicknesses. That system would make it impossible to predict the hose size required for any application.
The AN numbers refer to the tubing OD in sixteenths of an inch. For example, 8AN hose has the same ID as a 1/2" nominal tube (8/16 = 1/2). 3AN hose has the same ID as a 3/16" tube. This means that 6AN hose will not introduce any appreciable flow restriction in a fuel system designed around 3/8" OD rigid tubing."
https://www.pegasusautoracing.com/docum ... =TECH00096
As Frank said, 3/8" hose (which is approximately the same size as #6 AN) isn't big enough for an external filter setup, you want #8 AN, which has an I.D. of ~½" - and the I.D. of its fittings will be nearly as big. Ideally you will also minimize the use of 45° and 90° elbows, since they can introduce as much restriction as several additional feet of hose.
AN hose sizes can be a little confusing at first:
"The idea behind AN hoses and fittings was to provide a flexible alternative to rigid tubing in plumbing aircraft and military vehicles. Sizes for rigid tubes were already standardized, with sizes called out by tubing OD (3/16", 1/2", etc). AN hose sizes were designed to match the ID sizes of these rigid tubes. Can you see the confusion starting? Tubing is known by OD, but the hoses are sized according to the tubing ID -- not the hose OD or even the hose ID.
AN hose sizes are based on the nominal OD of the tubing with a matching ID. It sounds convoluted, but it really is a simple idea that achieves a logical goal. If hoses were called out using the hose OD (following the same system used for tubing), the ID of a 3/8" hose would be much smaller than the ID of a 3/8" tube. On top of that, different hose types have different wall thicknesses. That system would make it impossible to predict the hose size required for any application.
The AN numbers refer to the tubing OD in sixteenths of an inch. For example, 8AN hose has the same ID as a 1/2" nominal tube (8/16 = 1/2). 3AN hose has the same ID as a 3/16" tube. This means that 6AN hose will not introduce any appreciable flow restriction in a fuel system designed around 3/8" OD rigid tubing."
https://www.pegasusautoracing.com/docum ... =TECH00096
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mlrailguy
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- Joined: Sat Nov 16, 2002 12:01 am
Re: Oil lines
Hoses were made up by professionals, so not worried about crimp. The hoses are about 14" long. They originally were 1/2 " to fit the barbs on 3/8 fittings, straight out from full flow pump to filter, then back to case.
They used #6 fittings on what looks to be 3/8 hose. These are standard steel fittings, commonly used on tractors and such. Will that be too much restriction through the fittings? Should I step up to #8 fitting and what ever size hose needed?
Really appreciate help from you guys.
They used #6 fittings on what looks to be 3/8 hose. These are standard steel fittings, commonly used on tractors and such. Will that be too much restriction through the fittings? Should I step up to #8 fitting and what ever size hose needed?
Really appreciate help from you guys.
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Marc
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Re: Oil lines
You're at the extreme limit for that size in this application IMO; it may work OK, but I wouldn't recommend it.
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Ol'fogasaurus
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Re: Oil lines
Basic question... Are you indeed using soft lines and why? Not being ornery but just making sure we all are on the same page. A would mounted engine and a solid mounted cooler might be able to use hard lines. Personally I might be more comfortable with my ride bouncing around and having the hoses bouncing around in the same direction I was 
. Even thought they are fairly short there should be some movement that could age the line quicker.
. Even thought they are fairly short there should be some movement that could age the line quicker.-
mlrailguy
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Re: Oil lines
Hmm, hard line, such as brake line or fuel line?
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Ol'fogasaurus
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Re: Oil lines
I think I would defer size and material to Marc, Pile or FJ on this. Since I have been guilty of using brake line for fuel line 
, pressure capability being the key here.
Retrospectively, i think that a hard line might, and I said might, be able to be bent to a tighter internal radius than a soft line could bent without collapsing in the bend... assuming that you are in the type of tight situation that needed wiggle room.
, pressure capability being the key here.Retrospectively, i think that a hard line might, and I said might, be able to be bent to a tighter internal radius than a soft line could bent without collapsing in the bend... assuming that you are in the type of tight situation that needed wiggle room.
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mlrailguy
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Re: Oil lines
Well, hose clamps have worked for ten years now, and they are cheap. Screw all that high dollar, confusing stuff.
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FJCamper
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Re: Oil lines
Hi Mlrailguy,
About hose clamps.
I was crewing for Charlie Kemp at the 1975 Dayona 24 Hours, who was a great 917 pilot and now is best remembered for the Kemp Cobra II. Charlie was in a Porsche RSR. We were still in practice, a couple of days before the race.
A hose-clamped main oil line blew off its fitting inside the car and scalded Charlie badly.
To this day, I use steel braided oil lines with AN fittings except in the very few circumstances where a turn or bend is so sharp that only rubber hose will do it. And I do hose clamp the rubber.
I've never had a hose clamp fail me, but I have seen them fail. I don't recommend them.
FJC
About hose clamps.
I was crewing for Charlie Kemp at the 1975 Dayona 24 Hours, who was a great 917 pilot and now is best remembered for the Kemp Cobra II. Charlie was in a Porsche RSR. We were still in practice, a couple of days before the race.
A hose-clamped main oil line blew off its fitting inside the car and scalded Charlie badly.
To this day, I use steel braided oil lines with AN fittings except in the very few circumstances where a turn or bend is so sharp that only rubber hose will do it. And I do hose clamp the rubber.
I've never had a hose clamp fail me, but I have seen them fail. I don't recommend them.
FJC
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mlrailguy
- Posts: 380
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Re: Oil lines
Yea, my buddy seized his engine last yr, after forgetting to make sure his clamps were all tight.
I had some hoses made up, as I mentioned earlier, but I don't think they will do the job.?
I even looked into 3/8 brake line, and if I had a bender, may have gone that route.
I had some hoses made up, as I mentioned earlier, but I don't think they will do the job.?
I even looked into 3/8 brake line, and if I had a bender, may have gone that route.
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Ol'fogasaurus
- Posts: 17881
- Joined: Mon Nov 13, 2006 10:17 pm
Re: Oil lines
http://www.eastwood.com/ew-brake-formin ... {MatchType}
An Eastwood unit.
http://www.napaonline.com/napa/en/p/SER774028
This is what I have and use. It makes some tighter than normal bends in tubing. It takes a bit of practice to keep the tube in the mandrel but when you do I would suspect that you would be more than happy with it.
Lee
An Eastwood unit.
http://www.napaonline.com/napa/en/p/SER774028
This is what I have and use. It makes some tighter than normal bends in tubing. It takes a bit of practice to keep the tube in the mandrel but when you do I would suspect that you would be more than happy with it.
Lee