BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E46 M3 (2001-2006)
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All Albums Garage Search Today's Posts Mark Forums Read Calendar FAQ

E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


Reply
 
Thread Tools Display Modes
Old Mon, Jan-20-2014, 10:14:12 PM   #11
bzsbimmer
Registered User
 
Join Date: Jun 2009
Posts: 1,700
In the garage:
Reputation: 0 bzsbimmer is on a distinguished road
Location: Modesto, Central Valley CA

South Korea




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

For those that have done a VANOS job where pressure had to be relieved or an SMG job where pressure had to be bled, there must be a reference on how to recharge it.

I have not seen one which leads me to believe it's not nitrogen based.
29 to 43 Bar is 421 to 624 PSI
__________________
Helping the economy one mod at a time
Alpine E90 M3
Jump to top bzsbimmer is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Mon, Jan-20-2014, 10:22:46 PM   #12
dafoe
Registered User
 
dafoe's Avatar
 
Join Date: Jun 2009
Posts: 4,140
In the garage:
Reputation: 0 dafoe is on a distinguished road
Location: Frederick, MD

United States




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

Quote:
Originally Posted by bzsbimmer View Post
For those that have done a VANOS job where pressure had to be relieved or an SMG job where pressure had to be bled, there must be a reference on how to recharge it.

I have not seen one which leads me to believe it's not nitrogen based.
29 to 43 Bar is 421 to 624 PSI
Haven't seen anything about recharging. Would just assume it's replaced.

But, have a read here on the vanos section. It talks about how it's nitrogen based.

http://www.google.com/url?sa=t&rct=j...59568121,d.cWc
__________________
2001 M3, LSB 6spd, purchased 6/09 with 25K miles.



Mods: Coyne Performance built ///M3, Carrillo, Mahle pistons ARP, Schrick 280/288, TTFS, CSL Airbox, CSL ECU, CSL MAP, CSL air rail, SuperSprint stepped, Larini exhaust, 3.91 gears, Pulleys, TCKline S/A coilovers, PowerFlex RTAB's, AKG Subframe, FCAB, Differential, Apex ARC-8's, Turner subframe reinforcement, Michelin PSS, Laser Interceptor, Coby Alcantara wheel, Beisan Vanos Fixes, Brembo BBK
Jump to top dafoe is offline   Reply With Quote
Old Mon, Jan-20-2014, 10:31:45 PM   #13
bzsbimmer
Registered User
 
Join Date: Jun 2009
Posts: 1,700
In the garage:
Reputation: 0 bzsbimmer is on a distinguished road
Location: Modesto, Central Valley CA

South Korea




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

Good read!
I'd love to see a x-cut unit to see inside. These are much smaller than the accumulators we have in our hydraulic systems... that's for sure.
__________________
Helping the economy one mod at a time
Alpine E90 M3
Jump to top bzsbimmer is offline   Reply With Quote
Old Tue, Jan-21-2014, 12:34:22 AM   #14
nowanker
"He's no wanker!"
 
Join Date: Sep 2012
Posts: 913
Reputation: 0 nowanker is on a distinguished road
Location: Mountain View, SF bay area

United States




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

Never investigated it... Early 5/6/7 series cars that used P/S pump pressure for brake assist (the "H-31" system) had a similar nitrogen charged pressure reservoir for engine-off brake boost. They required no service, and were supplied fully charged as replacements. They did fail, and it was easy to tell, not only by the lack of assist with the engine off, but also by lag in the boost if you nailed the pedal.
Would a failed vanos accumulator similarly result in sluggish vanos action?
Jump to top nowanker is offline   Reply With Quote
Old Tue, Jan-21-2014, 01:56:54 AM   #15
kuksul08
Registered User
 
Join Date: Nov 2006
Posts: 2,296
Reputation: 0 kuksul08 is on a distinguished road
Location: CA

United States




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

Maybe it's just like the nitrogen reservoir on a shock? You can run those basically forever without replacement. It's the seals that wear out in that case.
__________________

~*Mods*~: High Flow Carbon Fiber Strut Pipe Trim, Custom Aero DME Shift Linkage, Forged Titanium Race-Euro-Spec Illuminated Diff Sleeves, Catless Dog CSL Retrofit, Mod Bug Delete & More
S54 Valve Adjustment DIY, Excel, Print out: https://www.dropbox.com/s/z1jdt6kbu7...0info.zip?dl=0
S54 VANOS DIY video (cam bolts, oil pump disk, etc.): http://www.youtube.com/watch?v=9SkT2j3jsU0
Jump to top kuksul08 is offline   Reply With Quote
Old Tue, Jan-21-2014, 03:21:18 AM   #16
RedM3/4
Registered User
 
Join Date: Jul 2005
Posts: 7,970
Reputation: 0 RedM3/4 is a jewel in the rough

United States




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

No expert, but seems unlikely. Pressure almost certainly bleeds down after the car is off. Not the accum/charge in it, rather other seals/pumps in the system will leak down to "exhaust", aka tank pressure, in this case the oil pan.
An accumulators normal job is to fulfill an initial extra surge in the need for pressure; they in essence store energy.
Think of it as a buffer in the event the vanos is quickly actuated many times in a row where the vanos pump may not quite keep up with the load, maybe like revving the engine up and down all the way through the actuation range of advance/retard several times (can't think of a track or street scenario but you get the idea).

ADS

Quote:
Originally Posted by dafoe View Post
After talking to some folks, reportedly this just pre charges the vanos system when or prior to starting the car, after that the pressure is maintained by the pump and pressure regulator. Apparently they don't need re filled.
__________________
98 M3/4, Supersprint catback, UUC red tranny mounts, Rogue SS w/UUC dual selector rod, wired V1.
Sold to my son, still in the family!
06 SMG/ZCP - April 09, Dinan over Konis, RAC RG63, homelink with off-delay (working), multifunction steering wheel buttons, RacingBrake Front kit.
Jump to top RedM3/4 is online now   Reply With Quote
Old Tue, Jan-21-2014, 04:16:15 AM   #17
Hacksaw
What broke now?
 
Hacksaw's Avatar
 
Join Date: Nov 2012
Posts: 1,525
In the garage:
Reputation: 0 Hacksaw is on a distinguished road
Location: San Antonio

United States




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

Since there are no provisions to service said accumulator I feel BMW intended it to be lifetime. Now what that lifetime is remains to be seen.

I have however added the oil line going to this accumulator as a service item to any vanos rebuilds I perform. Here in Texas at least the lines are really starting to show signs of heat breakdown. There is a steel braided section near the accumulator that seems to bake rather nicely. YMMV
__________________
'02 BMW ///M3
Imola Red|Blk Cloth|6MT|FS CSL Custom TUNE -MSS54HP|CSL Replica Airbox|Euro Headers|BimmerWorld 3.5" race front Y and resonator|Hacksaw's custom 3.5" SS exhaust system w/Magnaflow and 4 tipped goodness|SGT RS-ENR Coilover Kit|Evo Sport Performance Pulley Set|CDV Delete|UUC USS & DSSR|Sparco Roadster Seats|StopTech ST-40 BBKs on all 4|Beisan Systems vanos rebuild w/original stock exhaust hub|Kirk 4 point roll bar|CF CSL Rep Trunk|GC Race F/R Sway Bars|TR Motorsports MT-1|Avin Avant 2|Seibon CF GTR Hood

Jump to top Hacksaw is offline   Reply With Quote
Old Tue, Jan-21-2014, 04:22:01 AM   #18
driller
your hole is our goal
 
driller's Avatar
 
Join Date: Jun 2011
Posts: 61
In the garage:
Reputation: 0 driller is on a distinguished road
Location: salmon arm B.C

Canada




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

I have seen hydraulic accumulators in my hydraulic systems on my drill rigs
They can be recharged at a hydraulic shop
Over the years they do tend to lose its charge

Sent from my SGH-I547C using Tapatalk
Jump to top driller is offline   Reply With Quote
Old Tue, Jan-21-2014, 04:55:34 AM   #19
RedM3/4
Registered User
 
Join Date: Jul 2005
Posts: 7,970
Reputation: 0 RedM3/4 is a jewel in the rough

United States




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

I've not seen this one specifically, have seen the SMG accum. Looking at realoem.com, the vanos accum likewise seems to have one opening, and no way to be dis-assembled. I'd estimate it to be about 8oz in size. It is possible there's a way to put a syringe in and charge it somehow; after all, it had to be charged initially. It occurs to me they may have a bladder versus a simple o-ring, but this is totally speculative.
But I don't think it is directly comparable to the gear you see on a large rig, or in my case, what I've seen in machine tool systems.

ADS

Quote:
Originally Posted by driller View Post
I have seen hydraulic accumulators in my hydraulic systems on my drill rigs
They can be recharged at a hydraulic shop
Over the years they do tend to lose its charge

Sent from my SGH-I547C using Tapatalk
__________________
98 M3/4, Supersprint catback, UUC red tranny mounts, Rogue SS w/UUC dual selector rod, wired V1.
Sold to my son, still in the family!
06 SMG/ZCP - April 09, Dinan over Konis, RAC RG63, homelink with off-delay (working), multifunction steering wheel buttons, RacingBrake Front kit.
Jump to top RedM3/4 is online now   Reply With Quote
Old Tue, Jan-21-2014, 07:31:39 AM   #20
bzsbimmer
Registered User
 
Join Date: Jun 2009
Posts: 1,700
In the garage:
Reputation: 0 bzsbimmer is on a distinguished road
Location: Modesto, Central Valley CA

South Korea




Default Re: VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this?

Quote:
Originally Posted by RedM3/4 View Post
I've not seen this one specifically, have seen the SMG accum. Looking at realoem.com, the vanos accum likewise seems to have one opening, and no way to be dis-assembled. I'd estimate it to be about 8oz in size. It is possible there's a way to put a syringe in and charge it somehow; after all, it had to be charged initially. It occurs to me they may have a bladder versus a simple o-ring, but this is totally speculative.
But I don't think it is directly comparable to the gear you see on a large rig, or in my case, what I've seen in machine tool systems.

ADS
This was my thought about a bladder system. Our hydraulic systems, probably much like Drillers, are large piston units for high pressure die casting. Our hydraulic pressure units for our CNC machines are much smaller however I don't have much knowledge of their inner workings.

For some reason I keep thinking about the SMG pressure system vs the original topic of VANOS high pressure accumulator
__________________
Helping the economy one mod at a time
Alpine E90 M3
Jump to top bzsbimmer is offline   Reply With Quote
Reply

Bookmarks

Tags
accumulator, charged, nitrogen, servicing, shouldn’t, vanos

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT. The time now is 07:45:11 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright ©1999-2017 M3Forum.com
Discussing VANOS Nitrogen Charged Accumulator, shouldn’t we be servicing this? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)