Engine Differences
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Tagged with:
- Engine - SD33
Table of Contents
There were 3 basic configurations of the SD33 available with the MQ Patrol. As the model progressed, various components of the engine were refined, and a turbocharger was added on some models.
Owners frequently want to know if their SD33 NA can handle a turbo. The simple answer is YES! Whilst improvements were made to the MK SD33-T engine to increase longevity, the SD33 has proved a robust engine and many NA versions have been turbocharged with no issues in the past.
You may also want to refer to the wiki page on general MQ and MK differences.
| Component | MQ SD33 NA | MK SD33 NA | MK SD33 Turbo | Notes |
|---|---|---|---|---|
| Piston Rings | 5 | 3 | 3 | For MK, a full keystone design was adopted for the top ring, and a ring carrier was added to the ring groove. |
| Crankshaft Arms | Standard | ? | Redesigned | - |
| Oil Jets | No | ? | Yes | Cools the cylinders. |
| Extra Oil Passages | No | ? | Yes, to connect left and right oil galleries. Also extra external barbs for turbo oil supply/return. | - |
| Oil Pump Flow (litres per minute) | 42 | ? | 48 Also stronger drive spindle. | To accommodate the oil jet spray and turbo lubrication. |
| Oil Filter | Paper Cartridge | Spin-On Filter | Spin-On Filter | The MK filter system is considered superior, plus the filter is cheaper and more common. The filter system from 1 engine can be swapped to another. |
| Oil Cooler | 3 core | ? | 5 core | Extra capacity to handle turbo heat. |
| Camshaft Journals | Standard | ? | Enlarged | - |
| Cylinder Head Ports | Standard | ? | Enlarged | - |
| Cylinder Head Pre-Combustion Chambers | Standard | ? | Enlarged | - |
| Cylinder Head Internal Steam Ports | Standard | Extra | Extra | Extra steam ports were added near the middle of the head, probably between pistons 2,3 and 4. |
| Inlet & Exhaust Manifolds | See note. | See note. | See note. | Different manifolds are used to suit turbo engines. They use the same flange and bolt patterns to the head and can interchange. |
| Air filter | Standard | ? | Enlarged | - |
| Injector Pump | Throttle body on the intake manifold | ? | Throttle controlled in the pump itself | The injector pumps work in different ways, but can be swapped. Different length throttle cables are also used to suit. |
| Electronic Power | 24 volt | 12 volt | 12 volt | Different alternators, starter motors, glow plug relays and edic motors to suit. *Not all MK are 12 volt, there are a few odd-balls, but the majority are. |
| Clutch | ~240mm | ? | ~270mm | Larger clutch (and matching flywheel and pressure plate) to accommodate the additional power. |