| Message |
"In order to get the greatest benefi t from water-cooling, the turbocharger’s center
housing should be rotated around the central axis (the shaft) so that the water ports are at
an angle of approximately 20° from the horizontal. This is necessary to promote the thermal
siphoning effect discussed earlier. The input water (colder side, from the engine’s cooling
system) should be plumbed in to the lower of the two ports after the housing is rotated. The
hotter output water leading back into the engine’s cooling system should be plumbed into
the higher port and allowed to travel “uphill” all the way back to where it meets the cooling
system. No up/down kinks or “traps” should be present in this return line. Either side of the
turbocharger can be used as the outlet – the water core was designed for fl ow in either direction.
Proper plumbing execution in this way, with the colder water entering from the low
side, leading into the rotated center housing and exiting the higher side, will reduce formation
of air pockets and allow unrestricted fl ow during the thermal siphoning period after the
engine is shut down. Full benefi t of the thermal siphoning effect will be realized and internal
turbo temperatures will be minimized. Garrett® laboratory testing has shown that peak temperatures
in the center housing can be reduced by as much as 90°F (50°C) when the center
housing is rotated to allow the hotter outlet water to escape from the higher port. Rotating
the housing more than 20° from horizontal may further reduce temperatures slightly but may
also impede oil drainage, so stick with 20° as a maximum"
Houston Z
www.houston-nissans.com
|
 |
