Cold air intake: missing hose?

[Fletcher]

The little black plastic box that the intake is connected to at the top of the picture has what appears to be another place to connect a hose coming out the bottom of it.  Is something missing here?  Thanks!

[dlhoovler]

Yes, but that's because something was added. Or changed.

 

The original exhaust manifold had a heat shield (cast aluminum or stamped steel, depending on year) with an opening on the front similar to the one on the bottom of the black box. A flexible insulated tube connected the two. That black box is the "summer/winter" box. On cold startup, it directs warm air from around the exhaust manifold into the intake to prevent carb icing. A bimetallic element inside moves a flap as it warms up to switch over to cool outside air. The lever on the side can be clipped in place during warm weather to lock out the warmup cycle - written on the box in German are directions to reposition it in the fall for carb heating (or something to that effect). 

 

With your header, you don't have the heat shield, but just leaving the bottom of the box open would still allow some warm air in if you want. Or just lock it to the summer setting. You may, however, want to consider using an exhaust manifold gasket with an integrated heat shield from an e21 or e30. It won't have the fitting for the box, but it does help to avoid cooking your spark plug wires. 

 

-Dave

[jgerock]

The exhaust manifold heat shield had a hot air hose that connected to the bottom of the “Summer/Winter” air intake mix nozzle.

[dlhoovler]

Here's the best pic of mine that I can find on my phone... 

 

 

-Dave

[dlhoovler]

... and Jim says in 23 words what took me an essay! ?

[jgerock]

8 minutes ago, dlhoovler said:

... and Jim says in 23 words what took me an essay! ?

Lol- or 2 words in American car lingo: “stove pipe”

[Conserv]

Below: ‘76 49-state version with original exhaust manifold and heat shield.

The weather here in the Northeast turned yesterday morning, so I moved the ‘76’s winter/summer lever to the thermostatically-controlled “winter” position.

 

Regards,

 

Steve

 

[Fletcher]

3 hours ago, dlhoovler said:

It won't have the fitting for the box, but it does help to avoid cooking your spark plug wires

Ah!  @rocketman, told me, when making upgrades specifically, not to throw this particular set of spark plug wires away as they have heat protection built in.  Now I know why.  Thanks!

[Fletcher]

2 hours ago, Conserv said:

Below: ‘76 49-state version with original exhaust manifold and heat shield.

The weather here in the Northeast turned yesterday morning, so I moved the ‘76’s winter/summer lever to the thermostatically-controlled “winter” position.

 

Regards,

 

Steve

 

where can I get a new one of these?

 

 

['76mintgrün'02]

38 minutes ago, Fletcher said:

where can I get a new one of these?

 

Put this link in your "Bookmarks"  https://www.realoem.com/bmw/enUS/partgrp?id=2215-USA---114-BMW-2002

 

It will allow you to pull up part numbers so you can google-up suppliers to choose from.

 

If you are replacing it due to a split at the box end, I'd just put a clamp on it there to close up the split and spend that money elsewhere.  They're not cheap and do not need to be absolutely air tight. 

 

I just leave mine connected at the box, when I remove the air cleaner and slip the air cleaner out of the rubber to remove it.

 

I do not have the heat shield on my manifold, or the hose running over from the box and "the car runs just fine in the winter."

I have wondered if it might help with condensation inside the engine though.  

 

Tom

 

EDIT:  I do have the e21 exhaust gasket with a built in heat shield to protect the wires.

 

Edited September 13, 2020 by '76mintgrün'02

[Fletcher]

30 minutes ago, '76mintgrün'02 said:

 

It will allow you to pull up part numbers so you can google-up suppliers to choose from

as I dig in to that, I wind up here.  Part found in these vehicles.  I gather mine would be one of the US ones, but which?  What do the “(xxxx)” numbers correspond to?  Thanks!

['76mintgrün'02]

I dunno about the xxxx numbers.  I just pull up the image that has part numbers that correspond to the one I am looking for and then google that number to find a source and an actual price.  The prices on RealOEM are not accurate and they are not a source for parts.  They do let you know which parts are NLA though. 

 

 

Sponsored links

 

No.	Description	Supp.	Qty	From	Up To	Part Number	Price		Notes
i	Solex 38-40 Pdsi
01	Protective COVER		1	09/1963	07/1977	11631252146	$110.70
02	Washer	6,4	4		07/1977	07119931044	$0.58		ENDED
02	Washer	A6,4-ZNS	4		07/1977	07119931018	$0.40		ENDED
02	Washer	A6,4-ZNNIV SI	4			07119904202
03	Wave washer	B6	10			07119932072	$0.09		ENDED
04	Hex bolt	M6X16-8.8 ZN	4			07119913466	$0.18		ENDED
04	Hex bolt	M6X16-8.8-ZNS3	4			07119904357	$0.36
05	Ring		1			13730742138	$9.11
06	Air hose	45X260	1			13730742139	$5.23
09	Rubber boot		1			13731258983	$14.06
10	Rubber Ring		1			13711250111			ENDED
11	Air filter element		1			13721256410	$22.55		ENDED
11	Air filter element		1			13721250795
12	Cover		1			13711250113			ENDED
13	Intake muffler		1			13711262612			ENDED
13	Air cleaner		1	09/1967	04/1971	13720742142			ENDED
14	Rubber grommet		1			13711250115			ENDED
16	Vibration damper		3			64218042132	$8.10
17	Rubber grommet		1			13720742125			ENDED
18	Washer		2			52118009560	$0.58		ENDED
18	Washer	A6,4-200HV-ZNS3	2			07119903791	$0.11
19	Hex nut	M6-8-ZNS	3			07119922832	$0.37		ENDED
19	Hex nut	M6-8-ZNNIV SI	3			07119905543	$0.38
21	Rubber buffer		1			13720742126	$0.89

 

 

The part number for the hose is 13731258983

Here is one for sale on Amazon https://www.amazon.com/URO-Parts-13731258983-Intake-Boot/dp/B07HGL53KX

[John76]

The hose that connects to the heat box (attached to the snorkel) is connected to a fitting at the end of the exhaust manifold.

 

[jgerock]

Since the stock fan is very close to the flexible hose from the snorkel- I wonder if using the larger diameter fan will contact the hose...