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In Reply to: Re: What are the differences in E28 S38 and E34 S3 posted by Douglas on February 07, 2001 at 21:13:34:
You beat me to it. You're absolutely right the info on the spring board is excellent. I thought that I might drop in my two cents and list the "old s38" specs.
| Type | In line 6, iron block alminimum head |
| Displacement | 3,535cc/216ci |
| Bore Stroke | 93.4 * 86.0mm |
| compression | 10.0:1 |
| Horesepower | 310@6900 rpm |
| Torque | 365 @ 4750 |
| Redline | 7200 rpm |
| Fuel system | BOSH electroning fuel injection |
| Valvetrain | dohc 4 valves/ cylinder |
The engine in the e34 M5 is mildly similar to the M1 24 valve
six cylinder M88 or e28 s38 engine as it was extensively reworked
expressly for the E34. One of the most notable changes was the
catalytic converter. The catalysts were a Lambda controlled three
way type using a secondary fan system to pump air into the exhaust
manifold when starting from cold. The bore remained the same
93.4 but revised crankshafts increased the stroke to 86 mm, an
increase of 2mm from the previous s38. The displacement reached
3,535cc. The head pistons and camshafts were among other parts
to receive significant revisions. Ultimately the motors share
few similarities. The valves were operated by a twin cam design
with a higher lift and different timing. The compression was upped
to 10:1. The later S38 included a forged crankshaft with 12 counter
balance weights. Also among the list of revisions was a redesigned
flywheel. The platinum hat wire air mass induction and metering
system was lifted from the 750i.
Furthermore the an electronic butterfly valve in the inlet
manifold was added. The electronic butterfly valve uses resonance
from the manifold to produce horsepower and torque in both the
mid and high range RPMs, (2500 - 4250 and 6750 to the limiter)
The control valve closes and essentially creates a variable length
intake pipe. The electronic butterfly valve is designed to provide
wider and better throttle response. The butterfly control valve
ultimately increased torque 14 percent and contributed to a mere
10 percent power increase.
| Type | In line 6, iron block alminimum head |
| Displacement | 3,435cc/ 211ci |
| Bore Stroke | 93.4 x 84.0mm |
| Compression | 9.8:1 |
| Horse Power | 256 @6,500 |
| Torque | 243 @ 4,500 rpm |
| Redline | 6900 rpm |
| Fuel System | BOSH electroning fuel injection |
| Valve Train | dohc 4 valves/ cylinder |
