INTERCOOLERS???
29 November 2007, 01:21 PM
#4
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Tube & fin design is as on original IC, the charge air runs through pipes from turbo-side to manifold-side of the IC, and between the pipes there are thin sheet-metal that the surrounding air passes and cools.
Original IC are made of steel or copper and are difficult to weld.
The aluminium that bar&plate ICs are made of are easier to and more people are capable of welding in. In these the charge-air runs through rectangular (abt. 7mm wide, full IC height on a TMIC) bars from turbo-side to manifold-side in the IC, I assume that inside tha bar there are evenly spaced plates to take up heat from the charge air. And between the bars, where the cooling air runs, the bars are joined by zig-zagging plates that the air squeeses between dispersing the IC's heat.
What basicly is more efficient I have no idea, apart rom that bigger mass and volume is a factor in itself.
Original IC are made of steel or copper and are difficult to weld.
The aluminium that bar&plate ICs are made of are easier to and more people are capable of welding in. In these the charge-air runs through rectangular (abt. 7mm wide, full IC height on a TMIC) bars from turbo-side to manifold-side in the IC, I assume that inside tha bar there are evenly spaced plates to take up heat from the charge air. And between the bars, where the cooling air runs, the bars are joined by zig-zagging plates that the air squeeses between dispersing the IC's heat.
What basicly is more efficient I have no idea, apart rom that bigger mass and volume is a factor in itself.
Last edited by Adam K; 29 November 2007 at 09:36 PM.
30 November 2007, 08:56 PM
#6
In terms of thermal efficiency, the bar and plate will perform better, THERMALLY, in size for size comparisons. This is because the bar and plate is heavier construction and therefore a greater heat sink than the lighter tube and fin.
However that is only part of the story.
Generally the size of an FMIC core on the front of a Subaru is far larger than will ever be required so the fact that bar and plate is a bigger heat soak is not relevant when the core size of the tube and fin is quite adequate.
Out of interest look at the relatively small core on the standard Skyline.
The other consideration is pressure drop across the FMIC core and here, a well designed tube and fin comes into its own as there is less resistance to air flow than with the bar and plate which suffers greater pressure drops.
A lesser consideration is the weight and you will save a bit, around 2kg, on a typical tube and fin core.
However that is only part of the story.
Generally the size of an FMIC core on the front of a Subaru is far larger than will ever be required so the fact that bar and plate is a bigger heat soak is not relevant when the core size of the tube and fin is quite adequate.
Out of interest look at the relatively small core on the standard Skyline.
The other consideration is pressure drop across the FMIC core and here, a well designed tube and fin comes into its own as there is less resistance to air flow than with the bar and plate which suffers greater pressure drops.
A lesser consideration is the weight and you will save a bit, around 2kg, on a typical tube and fin core.
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