Laminova Oil Cooler Information C43 Range

To help you choose and set up your Laminova we have put together the Laminova Oil Cooler Information page. This article is all about choosing the right C43 Laminova oil cooler for your engine and giving you the important information to help make key decisions. This will help you with specifying and tuning your Laminova oil cooler.

Laminova Oil Cooler Information

We cover the following subjects:

  • Performance Graphs
  • Making Sense of the Performance Graphs
  • Fitting a Coolant Plug
  • Oil Pressure Drop
  • Specifying The Coolant And Oil Port Size & Type
  • Laminova C43 Dimensions & Weights

Performance Graphs – Choose The Right Laminova Oil Cooler

This is one of the most important parts of the Laminova oil cooler information page. Ensuring your Laminova oil cooler has adequate oil flow capacity is the first priority.

The most popular style of Laminova for engine oil cooling is the range referred to as C43. This is available in three core lengths and it has many options regarding the water and oil connections. The core lengths are:

  • 92mm – Part # C43-92
  • 182mm – Part# C43-182
  • 332mm – Part# C43-332

The Laminova C43 oil cooler is the most used version Laminova manufacture. It has a lower unit cost than other types and is very efficient at cooling oil.

Each of the three sizes has different heat transfer capacities that relate to the oil flow against the coolant flow measured in litres per minute (litres/min or ltr/min or even l/min). Take some time to have a close look at this Laminova oil cooler information.

Lets look at the performance graphs for each of the C43 Laminova oil coolers.

Laminova C43-92-chart

The C43-92 is the smallest of the C43 Laminova units. The headline with this size is that an engine with more than 20 ltr/min oil flow rate means this unit will not give any cooling benefit. In broad terms this is suitable for smaller engines.

Laminova C43-182-chart

The C43-182 is the mid size oil cooler that is a popular unit. The limiting factor regarding performance is that oil flows in excess of 40 lts/min will not benefit from adequate cooling. Check your engines maximum oil flow and if it is below 40 ltrs/min this may be the one for you.

Laminova C43-332-chart

The largest C43 oil cooler has capacity for pretty much any oil flow rate that is being used on standard or performance engines.

Making Sense Of Laminova Oil Cooler Information

Open-closed-part-closed-bypassThe size of C43 Laminova for your application is primarily driven by the maximum oil flow rate of your engine. The cooling benefit can be fine tuned by using a plug if required. If you have an undersized Laminova it is possible to have insufficient thermal transfer capacity or in extreme circumstances insufficient oil flow capacity. Either of these may lead to problems. If you have an oversized Laminova you will not experience over cooling of your engine oil* but you will be taking up extra space and spending slightly more money.

*= It is not possible to over cool oil with a Laminova, but is possible with an oil to air oil cooler – read the Laminova or Regular Oil Cooler article

Interpreting the Laminova oil cooler information to ensure you get the right size unit is another stage  in the process and well worth the time and trouble to get it right. To determine the version of C43 Laminova oil cooler to use you should first confirm the maximum oil flow rate of your engine and then choose the size that will accommodate that flow rate and give you the sort of temperature drop and range you desire.   Each of the above three Laminova oil cooler information graphs has two lots of information, the left hand side refers to cooling performance with a coolant flow rate of less than circa 80 ltrs/min. In such instances the central ‘coolant by core with small outer and by passpass’ is closed off to force the coolant to flow through the small outer channels in the Laminova core. This helps the coolant to transfer heat from the oil. The right hand side refers to coolant flow rates higher than 80 ltrs/min that will have the coolant by pass or the larger central hole on the Laminova core open.  Most engines circulate the coolant in excess of 80ltrs/min.

This Laminova oil cooler information effectively allows the user to tune the Laminova to obtain the optimum coolant benefit.

Broadly speaking the heat transfer from oil to coolant is normalised across the coolant flow range by either using or not using a coolant plug. At very low coolant flow rates the heat transfer isn’t so good and in all three graphs you will see the lines (Blue, Red & Black) have an upward ‘kick’ in this area to show the heat transfer to coolant is poor. By fitting a plug the coolant is forced to flow along the outer channels in the core and therefore exposed to the heat of the oil. Each of the three above graphs show the drop in oil temperature for three given oil flow rates per size of cooler when the coolant by pass is open and closed (plug not fitted or fitted).

Fitting a Coolant Plug

If you need to fit one of the coolant flow plugs to your Laminova oil cooler you should do so before it has been assembled. Have your supplier do so when you order it. You can fit it yourself and you may want to look at our step by step Laminova assembly guide if you decide to dismantle and remove the core. For the purposes of this page here a few simple tips:

  • You need to plug only one end of the heat exchanger. Fitting plugs into both ends is not required.
  • Insert the plug in the end that has the coolant flowing into it. If your Laminova is in the top hose this will be the end that connects to the engine and if it is the bottom hose it will be the end that connects to the radiator.

Oil Pressure Drop

I’ll also include this graph to show oil pressure drop (the above three graphs show coolant pressure drop only) on all three sizes of C43. This shows a low pressure drop across the two oil ports for the majority of applications. It should be noted that these figures apply to the Laminova oil cooler only and care should be taken with hose type and layout to minimise the overall pressure drop. Swept, full flow hose ends are excellent but using a banjo and banjo bolt (even large in size) will impede oil flow and adversely affect performance.
Laminova C43-range oil-pressure-drop

Specifying The Coolant And Oil Port Size & Type

There is no such thing as a standard C43 Laminova, although some port sizes are more common than others. Each is put together to order to include the coolant and oil ports specified by the customer. This means that you need to know what you want and you need to understand why you want a certain size or type of connection. Dealing with specific detail to tune the Laminova oil cooler from the outset will save you time later. In this section I try to help you decide. But remember your Laminova supplier (Think Automotive) will be able to help you with any detail or talk about the pro’s & con’s of a particular set up – so don’t get worried by anything that is covered here.

Coolant Ports

Specify you coolant ports to be push on and the same outside dia as the connections on your radiator. In most cases the radiator, water pump (inlet) and thermostat housing (outlet) are a common size across all four ports. This isn’t always the case and you should check if, for example, you are mounting the Laminova close to the water pump inlet and this is a larger diameter than the other three existing hose connections. I recall the Rover V8 engine being like this. You may even want to have two different size water ports on your Laminova if this is the case.  Using push on coolant ports is true for almost all Laminova units that are sold. However it is possible to have a threaded coolant port but this is not viable or needed unless you have a cooling system that specifically requires this. To put this in to context I do not recall seeing a Laminova with threaded coolant ports in the past 10 years (since I started to be involved in this business) on any vehicle unless it was a very high end performance project.

This is the list of coolant ports you can choose for a C43 Laminova:

  • Push On – 16mm, 18mm, 24mm, 28mm, 32mm, 35mm, 38mm & 45mm
  • Threaded – JIC/AN  -16AN, -20AN & -24AN

laminova oil cooler water ports

Oil Ports

In most instances where a C43 Laminove oil cooler is used for engine oil cooling the oil ports fitted are -10 AN. Yes there are a whole range of others to choose from but -10 AN ticks all the boxes in the majority of applications. The important factor is that it does not restrict oil flow, I will do my best to explain why.

The -10 AN hose (stainless steel braided or push on) has a larger cross sectional area that the oil filter mounting spigot, this is a fixed and established ‘restriction’ or reference point that we can use as the narrowest point. Clearly we do not want to create or make and restrictions for oil flow with the equipment we are installing.

These are the important figures:

  • Inside diameter of the oil filter mounting spigot is 1/2″ or 0.5″.
  • Inside diameter of -10 AN stainless steel hose is 9/16″ or 0.5625″ and a cross sectional area increase of 26.75% over the oil filter spigot.
  • Inside diameter of -10 AN push on hose is 5/8″ or 0.625″ and a cross sectional area increase of 56.23% over the oil filter spigot.

Laminova-oil-port-sizeSo the -10 AN hose will not impede your oil flow unless you have very long runs. On long oil hose runs the friction on the hose inside wall becomes a significant factor (say longer than 3m plus for example). An increase in hose size to -12 AN is a viable option in such cases. But on the majority of regular set ups where the Laminova oil cooler is placed next to or near to the engine there is no need. If you have a set up that requires large bore hose (bigger than -10 AN) be sure why this is and check that the oil access hole on the Laminova housing (14.78mm) will not cause you a restrictive problem.

This is the list of oil ports you can choose for a C43 Laminova:

JIC/AN -6AN (power steering or transmission), -8AN (smaller engines or transmission), -10 AN, -12AN & -16AN

laminova oil ports


There is also an option to off set the oil ports on the 182 & 332 sizes or to have them in line. The default oil port position is centred (in line). You are able to specify the oil ports offset with one being left of centre and the other being right of centre. The Dimensional drawings below show what I mean in the C43-182 version.

Laminova C43 Dimensions & Weights

No Laminova oil cooler information page would be complete without the basic size and weight information. These line drawings are from the manufacturers website and slightly reworked for the purposes of this website. I have included the weight on each of the three line drawings.

laminova oil cooler information c43 90

laminova oil cooler information c43 180

laminova oil cooler information c43 330Information used to create the performance graphs supplied by SEM AB. Line drawings supplied by SEM AB and formatted for the purposes of this website.