New R Type

Old R Type

Description of changes

Core size(WxHxT)

600x255.6x103 600x300.5x103

600x298x97

2 sizes for vehicle specifications. Clearance from other parts or road.

Outer Fin

Louver Fin

Louver Fin

Pattern of louver fin.

Fin Height 7mm

Fin Height 8mm

More efficient fin with low fin height.

Fin Pitch 4.5mm Fin Thickness 0.075mm

Fin Pitch 4mm Fin Thickness 0.115mm

Increased area of cooling air enables 40% less resistance.

Inner Fin

Triangle Straight Fin Pitch 3.5 fins per 1cm

Group Tube

Temperature efficiency (thermal ratio) at high load was improved.- At low load

Old type 95.1% -> New R-Type 95.3% = 0.2% improved - At high load

Old type 87.5% -> New R-Type 88.5% = 1.0% improved

Tube

Height 4.3mm Thin Tube (t=0.4mm)

Height 6mm

Lower height of tube improved fin efficiency. Thin tube decreased heat resistance.