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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.


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Old Mon, Jun-10-2019, 07:49:34 PM   #1
sapote
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Default VANOS M3 vs non-M E46

M3 VANOS system is simpler and less parts than non-M.
M3 spline shafts have helical and straight splines, but non-M shafts has two helical splines (internal and external) in opposite direction. The function of the helical shaft is to convert linear to rotational motion, and so why the non-M has the complicated internal and external cut helical splines instead of one helix and one straight?
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Old Mon, Jun-10-2019, 08:24:17 PM   #2
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Default Re: VANOS M3 vs non-M E46

You tell us mr. vanos wizard
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Last edited by TboneM3; Wed, Jun-12-2019 at 04:55:56 AM.
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Old Tue, Jun-11-2019, 03:29:32 AM   #3
mrgizmo04
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Default Re: VANOS M3 vs non-M E46

Is that rhetorical and you'll tell us tomorrow?

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All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Old Wed, Jun-12-2019, 01:37:12 AM   #4
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Default Re: VANOS M3 vs non-M E46

Non M VANOS operating oil pressure is low, thus the piston oil volume displacement must be small to avoid low oil supply issue. This means the total piston travel is short (i.e. 15mm). In order to convert 15mm linear to 20 degrees cam rotation, it makes sense to have two helical gears on the spline shaft – outer to the hub and inner to the cam to gain more cam rotation.

To meet the goal of fast acceleration car, the M3 VANOS has to response much faster than non M. This requires high pressure oil and a high gain system response. To achieve high gain, either with larger piston or longer stroke (i.e. 30mm). They chose longer piston stroke for a more compact module. To convert 30mm linear motion to 30 degrees cam rotation, there is no need for a double helical splines. Instead simply one helical and one straight on the shaft.

M3 has small solenoid because it only operates on a momentary basic: turned on a short time then switched off to hold the piston at a commanded position, and so little heat is generated.
Non M has larger powerful solenoid to handle the heat dissipation due to operating at a continuous current to hold the piston at a commanded position, instead of switched on and switched off as M solenoid.
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Old Wed, Jun-12-2019, 02:12:20 AM   #5
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Default Re: VANOS M3 vs non-M E46

Thank you Mr. Wizard
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Old Wed, Jun-12-2019, 02:23:42 AM   #6
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Default Re: VANOS M3 vs non-M E46

Sapote,
You're an interesting fella.
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Old Wed, Jun-12-2019, 03:45:30 AM   #7
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Default Re: VANOS M3 vs non-M E46

I'm just waiting for the day Doogan and sapote discover each other...

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Old Wed, Jun-12-2019, 04:09:07 AM   #8
mrgizmo04
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Default Re: VANOS M3 vs non-M E46

Lol

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'85 528e 164k miles (sold)
'05 M3 6MT coupe

All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).
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Discussing VANOS M3 vs non-M E46 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)