Tuning bmw M44 engine

[NissanSti200]

Hi Guys,

So as you all know i sold my Nissan's and bought me a nice clean E46! with only 100 000 on the clocks...the problem is...The car has a 19.L engine, its lazy and not so light on fuel as i hoped it to be! my worked car got better millage... i think! and i haven't even revved the thing past 4500rpms ONCE! Very Happy

So here is what i gathered about the M44 engine and the mods that could work on it.
Motor type: Four-cylinder in-line engine
Description: 1995 sees the displacement capacity of the 16-valve engine boosted to 1.9 litres as well. The cylinder head design has been modified. The former bucket tappets are dispensed with along with the bearing rails. The valves are now operated via roller-type rocker arms. The very small diameters of the rollers mean that the choice of valve timings results in flanks on the cams, which can now be produced using the available belt grinding process. These and a number of other measures serve to reduce friction and thus improve fuel efficiency. The arrangement of the cam followers allows for hydraulic clearance compensation in the stationary part of the valve drive.
The camshafts help to balance the additional unbalance masses, which enhances the smooth running of the engine. In principle, this special measure corresponds to the counterweights on the crankshaft.

Changes from M42 to M44 are as follows:
1. The crankshaft is now a spheroidal-cast type with four counterweights instead of a forged steel type with eight
counterweights;
2. Connecting rods and pistons were redesigned for improved NVH;
3. Conical valve springs were used in place of cylindrical valve springs;
4. The upper valve plate has been reduced in size;
5. Balance weights in the camshafts were now cast with the camshafts themselves;
6. The timing chain tensioner was redesigned to reduce wear;
7. The DME engine management system changed from M1.7 to M5.2;
8. Induction roar has been reduced by adoption of a sound-insulating cross-flow hose in the intake system as well as an intake silencer;
9. Rocker arms now have roller bearings;
10. A hot film mass air flow sensor is used in place of a vane type sensor; and,
11. The variable length intake system switches over 600 rpm earlier.
The new engine is said to be quieter and more fuel efficient as well as offering significantly enhanced torque. BMW claim a 70% reduction in friction over the M42

BTW, on BMW TIS 2007, I found out that E46 318d M47N has 90mm stroke without flywheel balancer and looked similar to E46 318d M47 crankshaft with 88mm stroke
The price of both crankshafts are similar, according to this site:

http://bmwfans.info/original/E46/Lim...1/ill-11_3513/

If it can be used with E36 S50 B30 US M3 piston which has 86mm diameter and 32.8mm compression distance plus 135mm conrod length, the resulting displacement is 2,091cc (86mm x 90mm) with 1,5 conrod ratio. Off course you need to enlarge the bore to 86mm (2mm larger for m42 or 1mm larger for M44)
The total deck height will 211.80mm or it will sits 0.35mm lower than M42/M44 standard deck height.
However, further comparison on ETK 2007 between the 90mm stroke crankshaft of E46 318d M47N (BMW p/n 11217790928) and the 88mm stroke crankshaft of E36 318d M47 (BMW p/n 11212247515) shows the difference in guide bearing shell and bearing shell used on the crankshaft (different BMW part number).
The guide bearing shell and bearing shell used on the crankshaft of E36 318d M47 and M42, M43, M44, M50 and M52 engines are all similar
So this is inline with the reference guide from Mike Kowalski in the beginning of this thread.
In other words, the 88mm crankshaft of 318d M47 seems the best fit to use as a stroker crank on M42 M44 engine.

Here is the list of cranks i can use:
M47 cranks (correct)
E46 320d. 1997-2001. Not the M47N
E39 520d. 1999-2003
E46 318d. 2001-2003/04 Not the M47N
* 1999-2004 Rover 75 CDT
I might get the M47 diesel crankshaft and swap to the M42 balancer sensor system

I also heard that there is another type of head which they swop out with the M44,,. im going to keep the intake stock and the exhaust restricted to still have that "quiet" effect.

And maybe add a m3 clutch and flywheel, as the stock unit weights in at 15kg!!!

[NissanSti200]

no awnsers???????

[nowstopwhining]

So can I put 2002 stock m3 camshafts in my basically stock 2003 325i?

I would make my own post but the damn forums wont let me. I really need an answer fast so I can buy the camshafts and get my motor back together.