Difference between revisions of "S5x"

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The [[BMW]] '''S5x''' range of engines are a line of  6-cylinder engines, fitted to BMW Motorsport models between 1992 and 2001. The range is comprised of two main units; the [[S5x#S50|S50]] and the [[S5x#S52|S52]]. All S5x engines are fundamentally based on the [[M5x]] series of engines that powered the [[E34]] M5 and [[E36]] M3, and are therefore very popular [[Engine_Swaps|engine swaps]].
+
The [[BMW]] '''S5x''' range of engines are a line of  6-cylinder engines, fitted to BMW Motorsport models between 1992 and 2001. The range is comprised of three main units; the [[S5x#S50|S50]], the [[S5x#S52|S52]] and the [[S5x#S54|S54]]. All S5x engines are fundamentally based on the [[M5x]] series of engines that powered the [[E34]] M5 and [[E36]] M3, and are therefore very popular [[Engine_Swaps|engine swaps]].
 
__TOC__
 
__TOC__
 
=Versions=
 
=Versions=
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==S50==
 
==S50==
  
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The S50 engine first saw action under the bonnet of the [[E36]] M3 as a 3.0 engine. These phenomenal units were complete rebuilds of [[M50]] engines; the blocks had a wider bore, the crank had a longer stroke and the whole compression was raised to 10.8:1. Compared to the simple 24V head of the M50, these engines featured [[VANOS]] technology and independent throttle bodies (six in all) for improved top-end performance.
+
The S50 engine first saw action under the bonnet of the [[E36]] M3 as a 3.0 engine. These phenomenal units were complete rebuilds of the iron-block [[M50]] engines; the blocks had a wider bore, the crank had a longer stroke and the whole compression was raised to 10.8:1. Compared to the simple 24V head of the M50, these engines featured [[VANOS]] technology and independent throttle bodies (six in all) for improved top-end performance.
  
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In 1995 they went through an upgrade, with an increased bore and stroke taking displacement to 3.2 litres. To cope this this, the heads were fitted with [[VANOS#Double_VANOS|Double VANOS]] to regulate both the intake and exhaust valves. Continuing to serve duty in the E36, these bigger lumps were also stuffed into the [[Z3]] M-Coupe.
+
In 1995 they went through an upgrade, with an increased bore and stroke taking displacement to 3.2 litres. To cope this this, the heads were fitted with [[VANOS#Double_VANOS|Double VANOS]] to regulate both the intake and exhaust valves, and a second oil pump fitted. Seeing active duty in the E36, these bigger lumps were also stuffed into the [[Z3]] M Coupe and Roadster.
  
 
S50 engines weigh '''151kg'''
 
S50 engines weigh '''151kg'''
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==S52==
 
==S52==
  
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Despite being heavily based on the M50, the M52 was a whole new engine, and it feels it. 20kg slimmer and a lot more responsive at the pedal, these engines are the most desirable of the M5x swaps.
+
Rather than develop the S50 further, in 1996 BMW adopted the S52 unit for the American market. Because of that, they are based on the iron block the US used, rather than the lighter aluminium version used in Europe.
  
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S52 engines weigh '''118kg'''
+
These engines were bored out similar to the [[S5x#S50|S30B32]], but retained the power output of the original S50US engine of 240hp. However, the increased stroke of the engine increased the maximum torque while flattening the torque curve, meaning you get more from the engine at lower revs.
 +
 
 +
S52 engines weigh '''141kg'''
  
 
{| class=wikitable
 
{| class=wikitable
Line 86: Line 88:
 
!Year
 
!Year
 
|-
 
|-
−
|S52B20
+
|S52B32
−
|2.0 L (1990 cc/121 in³)
+
|3.2 L (3192 cc/195 in³)
−
|110 kW (148 hp) @ 5900
+
|177 kW (241 hp) @ 6000
−
|190 N·m (140 ft·lbf) @ 4700
+
|320 N·m (236 ft·lbf) @ 3800
 
|6500
 
|6500
−
|80mm
+
|86.4mm
−
|66mm
+
|89.6mm
−
|1994
+
|1996
−
|-
 
−
|S52B25
 
−
|2.5 L (2494 cc/152 in³)
 
−
|123 kW (170 hp) @ 5500
 
−
|245 N·m (181 ft·lbf) @ 3950
 
−
|6500
 
−
|84mm
 
−
|75mm
 
−
|1995
 
−
|-
 
−
|S52B28
 
−
|2.8 L (2793 cc/170 in³)
 
−
|142 kW (193 hp) @ 5300
 
−
|280 N·m (207 ft·lbf) @ 3950
 
−
|6500
 
−
|84mm
 
−
|84mm
 
−
|1995
 
−
|-
 
 
|}
 
|}
  
−
==S52TU==
+
==S54==
  
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Another Technical Update came in 1998, affecting all the M52 engines with a system called Double-VANOS, which applied the existing VANOS technology to the exhaust camshaft as well. Alongside that, the Block of the engine was changed from cast iron to aluminium, and the engine management system was upgraded. Unfortunately, all this complexity somehow robbed the M52 of its charm, and these Double-VANOS units are best avoided.
+
Eventually all this nonsense about Euro v US engines was sorted out with the introduction of the S54. By returning to the original [[M50]] design, BMW were able to use the 3.2 litre design to eke out a massive 343hp, with only the smallest dilution down to 333hp for the US market.
 +
 
 +
These engines increased the bore of the original [[S5x#S50|S30B32]] even further and raised compression to 11.5:1, in order to squeeze every last pony from the design. The success of the experiment was seen with the launch of the [[E46]] M3 in 2001. A detuned version was fitted to the [[Z3]] M versions, presumably limited to stop it tearing the car apart, before returning to full-fat flavour for the Z4. A special 355hp variant was produced exclusively for the 2004 E46 M3 CSL.
 +
 
 +
S54 engines weigh '''148.5kg'''
  
 
{| class=wikitable
 
{| class=wikitable
Line 129: Line 116:
 
!Year
 
!Year
 
|-
 
|-
−
|S52TUB20
+
|S54B32
−
|2.0 L (1990 cc/121 in³)
+
|3.2 L (3246 cc/198 in³)
−
|110 kW (148 hp) @ 5900
+
|256 kW (343 hp) @ 7900
−
|190 N·m (140 ft·lbf) @ 3500
+
|365 N·m (269 ft·lbf) @ 4900
−
|6500
+
|8000
−
|80mm
+
|87mm
−
|66mm
+
|91mm
−
|1998
+
|2001
−
|-
 
−
|S52TUB25
 
−
|2.5 L (2494 cc/152 in³)
 
−
|123 kW (170 hp) @ 5500
 
−
|245 N·m (181 ft·lbf) @ 3500
 
−
|6500
 
−
|84mm
 
−
|75mm
 
−
|1998
 
−
|-
 
−
|S52TUB28
 
−
|2.8 L (2793 cc/170 in³)
 
−
|142 kW (193 hp) @ 5500
 
−
|280 N·m (207 ft·lbf) @ 3500
 
−
|6500
 
−
|84mm
 
−
|84mm
 
−
|1998
 
 
|-
 
|-
 
|}
 
|}

Revision as of 20:29, 25 February 2013

The BMW S5x range of engines are a line of 6-cylinder engines, fitted to BMW Motorsport models between 1992 and 2001. The range is comprised of three main units; the S50, the S52 and the S54. All S5x engines are fundamentally based on the M5x series of engines that powered the E34 M5 and E36 M3, and are therefore very popular engine swaps.

Versions

S50

The S50 engine first saw action under the bonnet of the E36 M3 as a 3.0 engine. These phenomenal units were complete rebuilds of the iron-block M50 engines; the blocks had a wider bore, the crank had a longer stroke and the whole compression was raised to 10.8:1. Compared to the simple 24V head of the M50, these engines featured VANOS technology and independent throttle bodies (six in all) for improved top-end performance.

In 1995 they went through an upgrade, with an increased bore and stroke taking displacement to 3.2 litres. To cope this this, the heads were fitted with Double VANOS to regulate both the intake and exhaust valves, and a second oil pump fitted. Seeing active duty in the E36, these bigger lumps were also stuffed into the Z3 M Coupe and Roadster.

S50 engines weigh 151kg

Engine Displacement Power Torque Redline Bore Stroke Year
S50B30 3.0 L (2990 cc/182 in³) 210 kW (282 hp) @ 7000 320 N·m (236 ft·lbf) @ 3600 7200 86mm 86mm 1992
S50B32 3.2 L (3201 cc/195 in³) 236 kW (321 hp) @ 7400 350 N·m (258 ft·lbf) @ 3250 7600 86.4mm 91mm 1995

S50US

Unfortunately for the US market, the phenomenal performance of the S50 engine came at too high a cost, both in dollars and pollution. To import such an engine and tune it to meet stringent emissions regulations would put a standard M3 far above the price bracket at which it was marketed.

Rather than rebuilding the S50, BMW adapted the existing M50 design to offer a tuned engine that performance half way between. Power and torque output are significantly decreased in contrast to the "original" S50, but are a massive improvement on the M5x design. At 240hp, the S50B30US slots neatly between the M50B25 at 191hp, and the S50B30 at 282hp.

This S50B30US is a strange beast. It features a VANOS head, but not the same VANOS system as the "genuine" S50 - it's stepped rather than variable - and also hasn't undergone the significant porting and polishing required to get the best gas flows. Most importantly, it lacks the independent throttle bodies found on every Motorsport engine since the M1 back in 1978.

Engine Displacement Power Torque Redline Bore Stroke Year
S50B30US 3.0 L (2990 cc/182 in³) 177 kW (241 hp) @ 6000 305 N·m (225 ft·lbf) @ 4250 6500 86mm 85.8mm 1994

S52

Rather than develop the S50 further, in 1996 BMW adopted the S52 unit for the American market. Because of that, they are based on the iron block the US used, rather than the lighter aluminium version used in Europe.

These engines were bored out similar to the S30B32, but retained the power output of the original S50US engine of 240hp. However, the increased stroke of the engine increased the maximum torque while flattening the torque curve, meaning you get more from the engine at lower revs.

S52 engines weigh 141kg

Engine Displacement Power Torque Redline Bore Stroke Year
S52B32 3.2 L (3192 cc/195 in³) 177 kW (241 hp) @ 6000 320 N·m (236 ft·lbf) @ 3800 6500 86.4mm 89.6mm 1996

S54

Eventually all this nonsense about Euro v US engines was sorted out with the introduction of the S54. By returning to the original M50 design, BMW were able to use the 3.2 litre design to eke out a massive 343hp, with only the smallest dilution down to 333hp for the US market.

These engines increased the bore of the original S30B32 even further and raised compression to 11.5:1, in order to squeeze every last pony from the design. The success of the experiment was seen with the launch of the E46 M3 in 2001. A detuned version was fitted to the Z3 M versions, presumably limited to stop it tearing the car apart, before returning to full-fat flavour for the Z4. A special 355hp variant was produced exclusively for the 2004 E46 M3 CSL.

S54 engines weigh 148.5kg

Engine Displacement Power Torque Redline Bore Stroke Year
S54B32 3.2 L (3246 cc/198 in³) 256 kW (343 hp) @ 7900 365 N·m (269 ft·lbf) @ 4900 8000 87mm 91mm 2001
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