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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 01-06-2007, 07:44 AM   #1
kevkev3123
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Timing belt or Chain?

hey, i have a 2006 325ci. and im just trying to plan out my mods and plan on how long im gonna keep the car. do we have timing belts or timing chains, as if its belts im not gonna keep the car further than 60,000 miles as this service is very expensive. learned the hard way on my audi, lol. and it wouldnt make sense to drop 25k in mods if im gonna get rid of it at 60k miles. thanks
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Old 01-06-2007, 08:31 AM   #2
johndddd
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timming belt is changed @ 90K
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Old 01-06-2007, 08:34 AM   #3
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Quote:
Originally Posted by johndddd View Post
timming belt is changed @ 90K
its a timing chain..
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Old 01-06-2007, 08:47 AM   #4
franz
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belts are not always expensive though audi's are.
chains ftw
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Old 01-06-2007, 09:37 AM   #5
Commander FAT
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what they said.
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Old 01-06-2007, 02:55 PM   #6
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thx guys!!
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Old 01-06-2007, 03:10 PM   #7
2001bmw330
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i have 121,000 miles on my 330i should i plan on changing my timing chain
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Old 01-06-2007, 03:32 PM   #8
CAOSyAMOR
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Chain camshaft drive
(all models)
The camshafts of some competitors engines (notably some Acura, Honda, Lexus and Volvo
models) are driven by a toothed belt, which requires periodic replacement. All current BMW engines have chain drive, automatically maintained at the correct tension and engineered to last the life of the car.
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Old 01-06-2007, 03:35 PM   #9
SkipII
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Nope

Quote:
Originally Posted by johndddd View Post
timming belt is changed @ 90K
E46s do not have a timing belt.
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Old 01-06-2007, 03:49 PM   #10
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Meaning of VANOS

E46s do not have a timing belt. BMW dumped them after so many E30 owners augered their valves into the pistons at 89,000 miles.

Instead, they came up with the VANOS system.

VANOS stands for Vhat A Novel Operating System!

In true BMW fashion (Germans are not as good at electronics as they think they are), they designed a highly integrated and complex metaphysical approach to valve train operation. Essentialy it automatically senses the speed, acceleration, load, intake manifold pressure and whether you have that worthless little red/blue vent on your dash turned one way or another and it just, well....how do we say this, Oprah...it just senses that it needs to adjust the valve timing, lift and duration.

The fellow who designed the system moved to the 7-series division and came up with the idea of the windshield wipers that automatically rotate in cold weather to keep them from sticking to the windshield.

Now, I can't attest that this is really how VANOS works, but I have read technical articles on it, and my explanation is easier to understand.

So, when you hit 90,000 miles, crack open a tall, cold one and congratulate yourself for not buying a Honda.

Last edited by SkipII; 01-06-2007 at 04:12 PM.
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Old 01-06-2007, 03:59 PM   #11
CAOSyAMOR
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Double VANOS variable valve timing
(all models)
All current BMW engines employ VANOS, a system of variable
valve timing. VANOS derives from VAriable NOckenwellen
Steuerung, German for "variable camshaft control" or variable
valve timing. The variable valve timing is achieved by rotating
each camshaft relative to its drive sprocket, which has the
effect of varying the point in the combustion cycle at which the
valves open and close. By varying valve timing according
to operating conditions, VANOS enhances low- to medium-speed
torque and emission control, and may positively affect fuel economy.
Valve timing is varied steplessly between the system's "earliest"
and "latest" settings rather than having simply low- and highspeed
settings. Hydraulically actuated, the VANOS system is
electronically controlled in response to engine speed, load
and temperature. VANOS operates on the intake
and exhaust camshafts of all current engines, and is thus called
Double VANOS. On M3 and M5 engines, VANOS has its own
high-pressure oil pump rather than operating on pressure from
the engine oil pump; these M systems are referred to as High-
Pressure Double VANOS.
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Old 01-06-2007, 04:04 PM   #12
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I enjoyed the explanation above yours ^^^
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Old 01-06-2007, 04:07 PM   #13
CAOSyAMOR
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Originally Posted by james2538 View Post
I enjoyed the explanation above yours ^^^
me too
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Old 03-04-2012, 03:16 PM   #14
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e46 timing belt

Hello, i have a 2001 318 M-Sport and everywhere I read I am told that the E46 has a timing chain not belt however during a recent trip to the mechanic I was told that I had a timing belt, I took a look and there it was....my timing belt. How is it so that I have a timing belt and not a chain like everyone says I should have?
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Old 03-04-2012, 03:45 PM   #15
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You also have a chain. Your car has N42 engine which has a chain. I dont know what you saw but you saw something else, maybe the drive belt.

Either way, your mechanic is a retard, all N42 and N46 engines have timing chain.

Just fvcking google it, you dont gotta open up a 5 year old thread for this. Google ALL your problems , takes a few seconds
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