Author Topic: M42 Vacuum Diagram (Read 84115 times)

Cobra Jet · « **Reply #15 on:** May 16, 2008, 10:01:18 AM »

NEW PROPOSED ROUTING BY mkodama:

ORIGINAL BMW ROUTING:

Hmmm... very interesting! I'm also wondering if this could be another possible "delete" mod and how it would work?

What someone should do too (especially those of you creative w/ CAD or Photoshop) - use the one of the above diagrams and do the common M42 "hose delete" under the intake THEN add in the proposed new vacuum routing, so we can see what it would really look like. I think some of the hoses and related parts in the original BMW diagram above are already deleted when the M42 hose delete mod is accomplished....

mkodama - just curious, have you attempted it?

mkodama · « **Reply #16 on:** May 16, 2008, 10:09:34 PM »

Quote from: Cobra Jet;49501

NEW PROPOSED ROUTING BY mkodama:
http://i187.photobucket.com/albums/x115/mkodama/proposedsetuprevision1b.jpg

ORIGINAL BMW ROUTING:
http://i141.photobucket.com/albums/r73/bogeyman700/318is-hose-nightmare.jpg

Hmmm... very interesting! I'm also wondering if this could be another possible "delete" mod and how it would work?

What someone should do too (especially those of you creative w/ CAD or Photoshop) - use the one of the above diagrams and do the common M42 "hose delete" under the intake THEN add in the proposed new vacuum routing, so we can see what it would really look like. I think some of the hoses and related parts in the original BMW diagram above are already deleted when the M42 hose delete mod is accomplished....

mkodama - just curious, have you attempted it?

I'm confused about what specifically you are suggesting by "adding" the new vacuum routing to the hose delete.

The picture that I made doesn't utilize the cooling system like the stock setup. In my version, I erased a few things like that throttle body heater and some of the tubing that would normally attach to the idle control valve.

And just in case you want to see, here is the coolant hose delete that goes along with the vacuum line delete. It removes the crankcase vent post-heating, and throttle body heater.

stock:

my version:

Wise Old Dog · « **Reply #17 on:** May 17, 2008, 08:12:40 AM »

Are you going to cap off the nipples from the head and the plastic outlet pipe? Or run a bypass hose?
Can the vacuum hoses that are still needed, be supported by only one source outlet?
Would the fluctuation caused by the ICV movement cause problems with the FPR vacuum needs. Maybe there is a reason the ICV hose hooks up further upstream than the other 2 hoses.
I don't see what is gained by re-locating the source for these 3 hoses.

mkodama · « **Reply #18 on:** May 17, 2008, 08:30:30 PM »

Quote from: Wise Old Dog;49571

Are you going to cap off the nipples from the head and the plastic outlet pipe? Or run a bypass hose?
Can the vacuum hoses that are still needed, be supported by only one source outlet?
Would the fluctuation caused by the ICV movement cause problems with the FPR vacuum needs. Maybe there is a reason the ICV hose hooks up further upstream than the other 2 hoses.
I don't see what is gained by re-locating the source for these 3 hoses.

All very good questions and points.

-The nipples on the head and the plastic pipe can be done either way. It has been shown that it is not necessary for coolant to flow out of the nipple on the side of the cylinder head so it can simply be capped off. Alternatively, bypassing from the output on the head to the plastic pipe also works.

-Concerning vacuum fluctuations and which vacuum ports each line should connect to, I simply just don't know how many vacuum connections there are on the throttle body and which are used for each purpose. If I had my car in hand(or even a good picture), I would be able to draw a much more precise routing. The fuel pressure regulator should probably be connected to a different source than the other two.

-I was never trying to change the source of the vacuum lines, just the complicated mess between the source and whatever device that needed vacuum.

vonkamp · « **Reply #19 on:** May 18, 2008, 07:48:33 AM »

Quote

-The nipples on the head and the plastic pipe can be done either way. It has been shown that it is not necessary for coolant to flow out of the nipple on the side of the cylinder head so it can simply be capped off. Alternatively, bypassing from the output on the head to the plastic pipe also works.

I just did this and was going for the bypass option but changed my mind.
The water outlet at the head (#12 on the drawing) is 3/8 hose (or metric equiv.) and the inlet at the plastic pipe (#20 on drawing) is 5/8 hose. I could not find a quality 3/8 to 5/8 hose barb so I went with the capoff option. been driving every day with no problems.

ClodKing · « **Reply #20 on:** May 19, 2008, 01:34:38 PM »

Quote

I just did this and was going for the bypass option but changed my mind.
The water outlet at the head (#12 on the drawing) is 3/8 hose (or metric equiv.) and the inlet at the plastic pipe (#20 on drawing) is 5/8 hose. I could not find a quality 3/8 to 5/8 hose barb so I went with the capoff option. been driving every day with no problems.

This is the point I am at right now in the coolant hose delete mod. I am still trying to figure out which route would best.

Typically our summers aren't too hot. But on occasion we will get a week or two of 40+ degree humid as hell weather...

But just like you said I couldn't find a good fitting to make the splice with. I even went to a hydraulic hose shop and their idea for an adapter would measure out to atleast 4-5" long...

I may just end up capping off the hose barbs.

mkodama · « **Reply #21 on:** May 20, 2008, 01:51:00 AM »

Quote from: ClodKing;49693

This is the point I am at right now in the coolant hose delete mod. I am still trying to figure out which route would best.

Typically our summers aren't too hot. But on occasion we will get a week or two of 40+ degree humid as hell weather...

But just like you said I couldn't find a good fitting to make the splice with. I even went to a hydraulic hose shop and their idea for an adapter would measure out to atleast 4-5" long...

I may just end up capping off the hose barbs.

Yeah, if you want, I could find the posts of other people that have capped this nipple off and had no problems and even gave an update a few months later.

If that is not enough proof for you, a member of bimmerforums.com did a stroker kit on his M42 so he had about 2.1 liters of displacement and 11.6:1 compression ratio. He also had performance software and I think a higher redline and he never had a single problem either. I think he just put a bolt in the nipple and welded it or something simple like that.

Asserti · « **Reply #22 on:** May 20, 2008, 08:50:37 AM »

I've noticed a while ago... I have no throttle body heater! :|

I'm going to install my cleaned injectors in a few weeks and will check then how it looks under the inlet, will take some pics also, I'm keen to know how it looks, my other M42 does have the throttle body heater.

mkodama · « **Reply #23 on:** May 20, 2008, 04:53:43 PM »

Quote from: Asserti;49751

I've noticed a while ago... I have no throttle body heater! :|

I'm going to install my cleaned injectors in a few weeks and will check then how it looks under the inlet, will take some pics also, I'm keen to know how it looks, my other M42 does have the throttle body heater.

Yeah, it was an emissions requirement thing to my knowledge, and also prevented ice forming which could freeze the idle control valve open causing the idle to stay really high.

Just out of curiosity, what year and model is the car without the throttle body heater?

Asserti · « **Reply #24 on:** May 22, 2008, 06:12:09 PM »

it's a European (Belgian) 318is from september 1990.

The other Is'es I've seen over here are with throttle body heather. I'm really curious about the routing of the cooling tubes. First I want to know if the car came this way from the factory or it happened on a certain point in it's life

mkodama · « **Reply #25 on:** May 22, 2008, 06:40:50 PM »

Yeah, if you look in the BMW ETK, it shows an option for both a non heated and heated throttle body. I wonder what determines whether the car gets a throttle heather or not.

ClodKing · « **Reply #26 on:** May 23, 2008, 08:15:54 AM »

Yeah I ran a bypass, but I wish I didn't...

It didn't turn out as nice as I planned it to be. The adapter I had to use was too long, and the bends that hoses had to do made them kink. So I am going to cap them off after I get the car safetied, and E-tested. Not because I think a mechanic will freak out if those nipples are capped off, but because I don't want to tear the intake apart again.... hahaha.

Does anyone know of a good place to order pipe caps from??

BlackBMWs · « **Reply #27 on:** July 21, 2009, 10:08:10 AM »

Quote from: mkodama;49773

Yeah, it was an emissions requirement thing to my knowledge, and also prevented ice forming which could freeze the idle control valve open causing the idle to stay really high.

Just out of curiosity, what year and model is the car without the throttle body heater?

It appears my 91 M42 does not have the throttle body heater plate, but the cooling hoses still route through the bottom of my throttle body itself. :cool:

blalor · « **Reply #28 on:** March 04, 2011, 11:41:27 AM »

Quote from: RED IS 91;38307

From the stolen file...................Hope it helps
good luck

Since this image has disappeared (grrrr), here it is from my Flickr account:

benton318i · « **Reply #29 on:** July 21, 2012, 08:28:27 PM »

Quote from: mkodama;49558

I'm confused about what specifically you are suggesting by "adding" the new vacuum routing to the hose delete.

The picture that I made doesn't utilize the cooling system like the stock setup. In my version, I erased a few things like that throttle body heater and some of the tubing that would normally attach to the idle control valve.

And just in case you want to see, here is the coolant hose delete that goes along with the vacuum line delete. It removes the crankcase vent post-heating, and throttle body heater.

stock:

my version:

Can anybody identify #17 in the stock diagram? I have no idea where to get that hose from!