6B3x family: Difference between revisions

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| manufacturer  = Mitsubishi Motors
| manufacturer  = Mitsubishi Motors
| aka          =  
| aka          =  
| production    =  
| production    = 2005 - 2021
| predecessor  = [[6G7x family|6G7x]]
| predecessor  = [[6G7x family|6G7x]]
| successor    =   
| successor    =   
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| block        = Die-cast aluminum
| block        = Die-cast aluminum
| head          = Die-cast aluminum
| head          = Die-cast aluminum
| valvetrain    = SOHC with 24 valves and MIVEC
| valvetrain    = Belt-driven SOHC with 24 valves and MIVEC
| compression  =  
| compression  = 9.5:1 (until 2010)<br>10.5:1 (after 2010)
| supercharger  =  
| supercharger  =  
| turbocharger  =  
| turbocharger  =  
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| emissions control =
| emissions control =
}}
}}
The 6B3x family of engines are 60 degree angle V6 engines produced by Mitsubishi in [[Shiga|Shiga]], Japan. It is an all-alloy design with single overhead camshafts driven by a belt. Valves are actuated by roller rockers with automatic lash adjusters on the exhaust valves only.
The '''6B3x family''' of engines are 60 degree angle V6 engines produced by Mitsubishi in [[Shiga|Shiga]], Japan. It is an all-alloy design with single overhead camshafts driven by a belt. Valves are actuated by roller rockers with automatic lash adjusters on the exhaust valves only.


The engine was designed primarily for use in the North American [[2g_Outlander|Second Generation Outlander]] and is designed to produce plentiful amounts of torque in the low and medium rev range as demanded by an SUV. It achieves this by using [[MIVEC]] for valve timing and lift and a variable length inlet runner manifold.
The engine was designed primarily for use in the North American [[2g_Outlander|Second Generation Outlander]] and is designed to produce plentiful amounts of torque in the low and medium rev range as demanded by an SUV. It achieves this by using [[MIVEC]] for valve timing and lift and a variable length inlet runner manifold.
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The engine was the last in Mitsubishi's early to mid 2000s 'engine renovation program'  following the [[4A9x family|4A9x]], [[4B1x family|4B1x]] and [[3B2x family|3B2x]].<ref>[https://web.archive.org/web/20070929124340/http://www.mitsubishi-motors.com/corporate/about_us/technology/review/e/pdf/2007/19e_13.pdf Newly Developed V6 MIVEC Engine], Mitsubishi Technical Review, 2007/19 (archived)</ref>  
The engine was the last in Mitsubishi's early to mid 2000s 'engine renovation program'  following the [[4A9x family|4A9x]], [[4B1x family|4B1x]] and [[3B2x family|3B2x]].<ref>[https://web.archive.org/web/20070929124340/http://www.mitsubishi-motors.com/corporate/about_us/technology/review/e/pdf/2007/19e_13.pdf Newly Developed V6 MIVEC Engine], Mitsubishi Technical Review, 2007/19 (archived)</ref>  


==6B31==
Mitsubishi discontinued production of the engine in 2021, shifting focus from V6 petrol to [[PHEV]] engines.
The 6B31 is a 3.0 litre V6 engine. It uses 24-valve single overhead camshafts with [[MIVEC]]. It displaces 2998 cc using a 87.6 mm x 82.9 mm bore and stroke. It has a 9.5:1 compression ratio and produces 162 kW at 6250 rpm and 276 Nm at 4000 rpm. Compared to the [[6G7x family|6G72 24-valve SOHC]] as used in the North American Eclipse GTS the engine weighs 25 Kg less and outputs 7 kW more power but 2 Nm less torque. The engine has a relatively flat torque curve, with 90% of the engine's torque available from just 2000 rpm.


In Australia it has been used in the ZG and ZH Outlander.
==6B31 (prior to 2010)==
The 6B31 is a 3.0 litre V6 engine. It uses 24-valve single overhead camshafts with [[MIVEC]]. It displaces 2998 cc using a 87.6 mm x 82.9 mm bore and stroke. It has a 9.5:1 compression ratio and produces 162 kW at 6,250 rpm and 276 Nm at 4,000 rpm. Compared to the [[6G7x family|6G72 24-valve SOHC]] as used in the North American Eclipse GTS the engine weighs 25 Kg less and outputs 7 kW more power but 2 Nm less torque. The engine has a relatively flat torque curve, with 90% of the engine's torque available from just 2,000 rpm.
 
In Australia it has been used in the ZG Outlander.


===Specifications===
===Specifications===
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|-
|-
|'''MIVEC Switch'''
|'''MIVEC Switch'''
|4750 rpm
|4,750 rpm
|-
|-
|'''Intake Runner Switch'''
|'''Intake Runner Switch'''
|3600 rpm
|3,600 rpm
|-
|-
|'''Output'''
|'''Output'''
|162 kW @ 6250 rpm, 276 Nm @ 4000 rpm
|162 kW @ 6,250 rpm, 276 Nm @ 4,000 rpm
|-
|-
|}
|}
{{clear}}
==6B31 (2010 and after)==
In 2010, Mitsubishi released a revised 6B31, replacing the previous dished pistons with flat topped ones increasing the compression ratio to 10.5:1, power to 169kW at the same 6,250 rpm and torque to 291 Nm at a lower 3,750 rpm.
===Specifications===
{|cellpadding="3" align="left"
|'''Displacement'''
|2998 cc (3.0 Litres)
|-
|'''Bore'''
|87.6mm
|-
|'''Stroke'''
|82.9mm
|-
|'''Compression Ratio'''
|10.5:1
|-
|'''MIVEC Switch'''
|4,750 rpm
|-
|'''Intake Runner Switch'''
|3,600 rpm
|-
|'''Output'''
|169 kW @ 6,250 rpm, 291 Nm @ 3,750 rpm
|-
|}
{{Clear}}
{{Clear}}


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<Gallery>
<Gallery>
File:6B31.jpg|6B31 Engine in a Mitsubishi Outlander
File:6B31.jpg|6B31 Engine in a Mitsubishi Outlander
File:6B31 Power.png|Power/Torque Graph for the 6B31
File:6B31 Power.png|Power/Torque Graph for the 6B31 (pre 2010)
</Gallery>
</Gallery>


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{{Mitsubishi engines}}
{{Mitsubishi engines}}


[[Category:Other Mitsubishi Technical]]
[[Category:6B3x Engine]]
[[Category:Mitsipedia/Revised]]

Latest revision as of 00:58, 4 January 2026

6B3x
Overview
Manufacturer Mitsubishi Motors
Production 2005 - 2021
Layout
Configuration V6
Cylinder block alloy Die-cast aluminum
Cylinder head alloy Die-cast aluminum
Valvetrain Belt-driven SOHC with 24 valves and MIVEC
Compression ratio 9.5:1 (until 2010)
10.5:1 (after 2010)
Chronology
Predecessor 6G7x

The 6B3x family of engines are 60 degree angle V6 engines produced by Mitsubishi in Shiga, Japan. It is an all-alloy design with single overhead camshafts driven by a belt. Valves are actuated by roller rockers with automatic lash adjusters on the exhaust valves only.

The engine was designed primarily for use in the North American Second Generation Outlander and is designed to produce plentiful amounts of torque in the low and medium rev range as demanded by an SUV. It achieves this by using MIVEC for valve timing and lift and a variable length inlet runner manifold.

The weight of the engine has been reduced by the use of an aluminum block, heads and oil pan along with resin rocker covers, resin intake manifold and a guideless dipstick to reduce weight by 25 Kg compared to the 3.0L 6G72. Mitsubishi claims the engine is only 5Kg heavier than the four cylinder engine used in the First Generation Outlander.

So far only the 3.0 Litre 6B31 has been released.

The engine was the last in Mitsubishi's early to mid 2000s 'engine renovation program' following the 4A9x, 4B1x and 3B2x.[1]

Mitsubishi discontinued production of the engine in 2021, shifting focus from V6 petrol to PHEV engines.

6B31 (prior to 2010)

The 6B31 is a 3.0 litre V6 engine. It uses 24-valve single overhead camshafts with MIVEC. It displaces 2998 cc using a 87.6 mm x 82.9 mm bore and stroke. It has a 9.5:1 compression ratio and produces 162 kW at 6,250 rpm and 276 Nm at 4,000 rpm. Compared to the 6G72 24-valve SOHC as used in the North American Eclipse GTS the engine weighs 25 Kg less and outputs 7 kW more power but 2 Nm less torque. The engine has a relatively flat torque curve, with 90% of the engine's torque available from just 2,000 rpm.

In Australia it has been used in the ZG Outlander.

Specifications

Displacement 2998 cc (3.0 Litres)
Bore 87.6mm
Stroke 82.9mm
Compression Ratio 9.5:1
MIVEC Switch 4,750 rpm
Intake Runner Switch 3,600 rpm
Output 162 kW @ 6,250 rpm, 276 Nm @ 4,000 rpm

6B31 (2010 and after)

In 2010, Mitsubishi released a revised 6B31, replacing the previous dished pistons with flat topped ones increasing the compression ratio to 10.5:1, power to 169kW at the same 6,250 rpm and torque to 291 Nm at a lower 3,750 rpm.

Specifications

Displacement 2998 cc (3.0 Litres)
Bore 87.6mm
Stroke 82.9mm
Compression Ratio 10.5:1
MIVEC Switch 4,750 rpm
Intake Runner Switch 3,600 rpm
Output 169 kW @ 6,250 rpm, 291 Nm @ 3,750 rpm

Gallery

  • 6B31 Engine in a Mitsubishi Outlander
    6B31 Engine in a Mitsubishi Outlander
  • Power/Torque Graph for the 6B31 (pre 2010)
    Power/Torque Graph for the 6B31 (pre 2010)

References

  1. ↑ Newly Developed V6 MIVEC Engine, Mitsubishi Technical Review, 2007/19 (archived)
MITSUBISHI PETROL ENGINES
3 cylinder
3A9x 3A90 3A91 3A92
4 cylinder
Neptune 4G41 4G42
Orion 4G11 4G12 4G13 4G15 4G17 4G18 4G19 G4ED
Sirius 4G61 4G62 4G63 4G64 4G67 4G69
Astron 4G51 4G52 4G53 4G54
Astron II Original Revised
Saturn 4G30 4G31 4G32 4G33 4G37
4G9x 4G91 4G92 4G93 4G94
4A9x 4A90 4A91 4A92
4B1x 4B10 4B11 4B11T 4B12
Inline 6
Saturn 6 6G34
V6
6G7x 6G71 6G72 SOHC 12v 6G72 SOHC 24v 6G72 DOHC Early 6G74 Late 6G74 Ralliart 6G74 6G75
6A1x 6A10 6A11 6A12 6A13
6B3x 6B31
V8
8A80 8A80
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