Firewall drain ports?

Catbert

Catbert

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Hello E9 enthusiasts and experts! I am a new owner and just beginning the process of checking-out my 1975 CSi. It appears I'm missing tubing that connects to what I believe are two drain ports along the firewall. I attached a photo of an engine bay that has the hoses. Can someone confirm this and indicate if any hose that fits the openings is fine and long enough to drain water in an open cavity without getting things wet that shouldn't? Thanks!
1974-bmw-30csi-4-speed-107-65e0e1704c684.jpg
 
Might be looking for these
www.max2002store.com

BMW E9 2.5CS-3.0CSL Under-Hood Drain Tube Set (Repro) | Maximillian Importing Co

Help drain water away from vital components and out of the chassis. These tubes are important for preventing rust and corrosion in the engine compartment. Located in the "tub" area on either side of the windshield wiper motor, at the top of the firewall. There are two such drains, one on each...
www.max2002store.com www.max2002store.com

You can search for parts here and then put the part number into a search engine or AI.

https://www.bmwmobiletradition-online.com/bmw/select.php?vin=&kind=P&arch=1

This is from my 2800CS search but I believe should be the same

1791325600926.png
 
Dan Wood said:
Might be looking for these
www.max2002store.com

BMW E9 2.5CS-3.0CSL Under-Hood Drain Tube Set (Repro) | Maximillian Importing Co

Help drain water away from vital components and out of the chassis. These tubes are important for preventing rust and corrosion in the engine compartment. Located in the "tub" area on either side of the windshield wiper motor, at the top of the firewall. There are two such drains, one on each...
www.max2002store.com www.max2002store.com

You can search for parts here and then put the part number into a search engine or AI.

https://www.bmwmobiletradition-online.com/bmw/select.php?vin=&kind=P&arch=1

This is from my 2800CS search but I believe should be the same

View attachment 227495
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Water outlet hose or drain tube. Makes sense. Speaking of making sense (the dollars and cents kind of sense), I'll just find some tubing I can connect and save $107 in buying an aftermarket dedicated part. I appreciate the link you provided so I have an idea of what the engineering was with respect to the length. Thanks!
 
Those drain hoses have a very special shape..... they are pinched at one end to keep hot air from the engine bay being pushed by the radiator cooling fan and sucked into the blower fan in what is a virtual venturi tube.

The pinched end allows rain water to leave and keeps hot air from mixing with your cool air coming in from the hood grills.

In souther California they are important

AND you don't have to smell your engine bay odors!
 
Last edited:
sfdon said:
Those drain hoses have a very special shape..... they are pinced at one end to keep hot air from the engine bay being pushed by the radiator cooling fan and sucked into the blower fan in what is a virtual venturi tube.

The pinced end allows rain water to leave and keeps hot air from mixing with your cool air coming in from the hood grills.

In souther California they are important

AND you don't have to smell your engine bay odors!
Click to expand...
Love it! Great info Meister Don. It figures the German engineers knew what they were doing. I'll design my own hose taking the design principles into account. Thanks again!
 
I have a used one for you- will ship this week.
 

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Mine are original. I martyr making some by making a vise shape, heating a tube and pinching it.. Although the cost and time associated with at my eked the Walloth cost...
 
Catbert said:
Thanks! Price including shipping isn't too terrible. Pay once. Cry once. Done!
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You will learn that if you ordered from W&N unfortunately your payment isn’t yet complete. Assume a 50% overhead once UPS has accounted for their assessment of tariff. There’s a long thread about it, not much to do unfortunately. UPS also charges a fee per line item so orders with many small items, which is far more common for many of us needing small rubber parts, or little trim pieces, etc, incur an additional penalty. Forewarned.
That being said, there isn’t a way around it, and they often have items that are impossible to find elsewhere. Our other overseas partners (CS-werk, oldtimer, @TomHom, e.g.) don’t use UPS with its exorbitant fees. If you’re ever traveling to Germany, order a bunch of stuff to your hotel before you go and bring it home with you along with some chocolate and you may come out ahead.
 
e9Leveque said:
You will learn that if you ordered from W&N unfortunately your payment isn’t yet complete. Assume a 50% overhead once UPS has accounted for their assessment of tariff. There’s a long thread about it, not much to do unfortunately. UPS also charges a fee per line item so orders with many small items, which is far more common for many of us needing small rubber parts, or little trim pieces, etc, incur an additional penalty. Forewarned.
Click to expand...
Thanks for the heads-up. I will hold off for now. Most of the parts they have listed for our E9 are unavailable, so much of this source for parts isn't viable.
 
Many of us have accumulated extra parts over the months and years. I am not organized enough to make a long list of everything that I need because I’m always taking on the next project and finding the next list of needed items, but my suggestion to you is the following:
1. Spend a few weeks with the car as-is. Figure out what weirdnesses there are. Why does this button not work? What is that weird rattle? What is this wire I found behind the glovebox that is bright purple and doesn’t look OEM? Make a list of those things
2. Poke around on the forum, especially the “what did you do to your E9 today” thread. You’ll see what projects people have worked on or completed and it will give you an idea of what you may want to tackle
3. Decide how much upgrading you want to do. Window relays and motors are classic example. Maybe yours work right now so you decide you don’t want to touch them. Maybe they don’t and if you’re going to fix it, upgrade makes sense. Maybe they do work but you’d rather take the time now to upgrade. All viable choices and there’s about 50 other equivalent decision points
4. From that list determine what parts are needed. Some are easy and you can order. Others are able to be found but not new and will require finding from another forum member or eBay so may take a while. Post a “parts wanted” thread of the things you need. Also keep an eye on the parts for sale thread for things that you may want to be working on.

Sorry for the long response, on a 15-hr flight so need to distract myself.
 
e9Leveque said:
Many of us have accumulated extra parts over the months and years. I am not organized enough to make a long list of everything that I need because I’m always taking on the next project and finding the next list of needed items, but my suggestion to you is the following:
1. Spend a few weeks with the car as-is. Figure out what weirdnesses there are. Why does this button not work? What is that weird rattle? What is this wire I found behind the glovebox that is bright purple and doesn’t look OEM? Make a list of those things
2. Poke around on the forum, especially the “what did you do to your E9 today” thread. You’ll see what projects people have worked on or completed and it will give you an idea of what you may want to tackle
3. Decide how much upgrading you want to do. Window relays and motors are classic example. Maybe yours work right now so you decide you don’t want to touch them. Maybe they don’t and if you’re going to fix it, upgrade makes sense. Maybe they do work but you’d rather take the time now to upgrade. All viable choices and there’s about 50 other equivalent decision points
4. From that list determine what parts are needed. Some are easy and you can order. Others are able to be found but not new and will require finding from another forum member or eBay so may take a while. Post a “parts wanted” thread of the things you need. Also keep an eye on the parts for sale thread for things that you may want to be working on.

Sorry for the long response, on a 15-hr flight so need to distract myself.
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To emphasize one particular point here, many of accumulate extra parts, and don't go to the trouble to take pictures and list them and monitor the listing and respond to questions. Instead, we wait for someone to post they need something. We spend far less time selling our excess parts that way.
 
e9Leveque said:
Many of us have accumulated extra parts over the months and years. I am not organized enough to make a long list of everything that I need because I’m always taking on the next project and finding the next list of needed items, but my suggestion to you is the following:
1. Spend a few weeks with the car as-is. Figure out what weirdnesses there are. Why does this button not work? What is that weird rattle? What is this wire I found behind the glovebox that is bright purple and doesn’t look OEM? Make a list of those things
2. Poke around on the forum, especially the “what did you do to your E9 today” thread. You’ll see what projects people have worked on or completed and it will give you an idea of what you may want to tackle
3. Decide how much upgrading you want to do. Window relays and motors are classic example. Maybe yours work right now so you decide you don’t want to touch them. Maybe they don’t and if you’re going to fix it, upgrade makes sense. Maybe they do work but you’d rather take the time now to upgrade. All viable choices and there’s about 50 other equivalent decision points
4. From that list determine what parts are needed. Some are easy and you can order. Others are able to be found but not new and will require finding from another forum member or eBay so may take a while. Post a “parts wanted” thread of the things you need. Also keep an eye on the parts for sale thread for things that you may want to be working on.

Sorry for the long response, on a 15-hr flight so need to distract myself.
Click to expand...
Not a long response. A sincere and meaningful response. Good suggestions. I already have my sorting out "to do" list on my CSi. What I discovered missing and/or broken so far has only been from minutes of looking. Relatively little things, but the replacement cost on some of these "little things" make one's hairs stand-up on the back.
 
Funny, had correspondence with a guy who is parting his 79 323i. As we spoke, I mentioned we could have worse habits like $10,000 watches or $2000 Ferragamo shoes. When I see the prices of parts today I'm leaning towards the shoes.

There are a handful of east coast individuals who are parts hoarders and when I have tried to purchase parts from them, they either don't want to sell or want top dollar. I asked them what will happen to all their parts when they are gone and they said my kids will take over. Really, do they have any idea what the parts are worth? I actually went through my parts last year and listed the 2025 value on the boxes so my kids know their worth, looks like I may need to do some editing
 
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