S38 3,6 og 3,8 forskjeller

[Bimmerlars]

Hva er gjort med B38 motoren for å få de siste 25 hestene? Er det kun det økte volumet som gjør det? Eller har den større ventiler, bedre bearbeida topp, vassere kammer osv?

[Thunegutt]

Ganske mye egentli. Større boring (93.4 vs 94.6) økt slaglengde (86 vs 90) ellers jo toppen helt ny, større ventiler,(kammene er like) nyere tennings-system. Sikkert noe jeg har glemt...

[Bimmerlars]

In 1991, BMW Motorsport redesigned the S38 to improve performance. The bore and stroke were increased again, and the displacement grew to 3795cc. The compression ratio was increased to 10.5:1. The intake and exhaust ports increased in size also, and each spark plug got it's own high-voltage coil, eliminating the distributor rotor and the high-voltage wiring. A smaller and lighter Emitec metallic catalytic converter replaced the ceramic catalytic converter. The main advantage of the Emitec metallic converter is that it increases the flow of the exhaust gasses. The Bosch Motronic 1.2 fuel management system was replaced with the Motronic 3.3 system. The new system includes a resonance flap control. This feature is the same as that used on the S38B36, but with an extra switch-point at 2480 rpm.

The S38B38 was the last evolution within the S38 engine family. It delivered 347 hp @ 6900 rpm and 409 nm torque at 4750 rpm. These changes stretched the S38 to its limits (the 5.4 mm web spacing between two cylinders is very narrow. This is 0.6 mm less than the M49/3 racing engine.)

Der stod det vel svar på det meste Tatt fra BMWworld.com

[oddis]

Jeg liker også BMW M registry:

http://www.bmwmregistry.com/faq.php

Her står det meste man har å lure på rundt M modellene, enten det være seg motor eller interiør.

How is the 3.8-liter M5 engine (S38 B38) different from the 3.6-liter version (S38 B36)?

The final evolution of the S38 powerplant, the S38 B38, was used in later versions of the E34 M5, none of which were sold in North America. In this application, the bore was increased (to 94.6mm) and the stroke lengthened (to 90mm), raising the displacement to 3,795cc. Though the added capacity makes the S38 B38 the largest six-cylinder production BMW engine of the modern era, it represents only a portion of the major revisions developed by BMW Motorsport at this time. Others include:

-Larger intake and exhaust valves

-Lighter pistons

-Shorter conrods

-Increased compression to 10.5:1

-Bosch Motronic 3.3 engine management system

-Distributorless ignition with six coils

-Redesigned intake and exhaust manifolds

-Revised throttle butterfly linked to Motronic engine control

-Dual-mass flywheel with harmonic balancer

-Metal catalysts for reduced backpressure and better heat conduction

The S38 B38 is normally rated at 340 hp (ECE)/347 hp (DIN) at 6,900 rpm and 295 lb/ft of torque at 4,750 rpm. However, a cleaner version was developed for Austria and Switzerland, rated at 334 hp (ECE) and later 327 hp (ECE). The S38 B38 can be identified by its grey (instead of black) cam cover surround.

What kind of gearbox does the E34 M5 have?

All M5s built before May, 1994 have a Getrag 280/5 five-speed manual gearbox with the following ratios: 3.51 (1), 2.08 (2), 1.35 (3), 1.00 (4), 0.81 (5). These cars have a 3.91:1 final drive, with the exception of North American-spec E34 M5s built to 1992 and 1993 specification which have a taller 3.73:1 final drive for better fuel economy.

As of May, 1994 production, the five-speed was replaced with a Getrag Type D six-speed manual box with the following ratios: 4.23 (1), 2.52 (2), 1.66 (3), 1.22 (4), 1.00 (5), 0.83 (6). A taller 3.23:1 final drive was fitted at this time.

All E34 M5s have a standard limited slip differential with a maximum locking of 25 percent.

[Øyvind L.]

Ikke alt som står på bmwmregistry.com er riktig, men enig i at den siden er veldig ok..