EXHAUST HEAT
The turbo charger on your car
is driven by exhaust gasses as they exit the combustion chamber at the end
of the power stroke. Flowing at high temperature and speed through the head
ports and into the exhaust manifold, the gasses are then routed into the
exhaust snail of the turbo. The temperature being dependent on various
factors including fuel/air mixture ratio, sustained RPM, cooling efficiency,
charge air temperature and others.
This high exhaust temp can have a detrimental effect on certain early
Mitsubishi Starion and Cordia (and probably other makes) exhaust manifolds,
causing extreme cracking and leaking. Apparently the metal casting mixture
was not correct to withstand the high temp's involved and was rectified on
post '84 models with an upgraded metal composition. So this means check
yours now! (Sometimes its hard to get to your manifold under all that
plumbing, but its worth it to know everything ok before modifying for more
boost.)
Look for obvious cracks or signs like white markings and check with a hose
held near the crack and the other end to your ear. You can hear the exhaust
leaking with the car idling. Obviously the only proper fix is a new (JB/JD
in the case of the Mits. STARION) manifold. Check with your Factory Parts
Dealer. Any manifold leaks before the turbo contribute to a loss of power as
the full exhaust charge is not available to help turn the turbo exducer
blades, therefore the turbo shaft and compressor wheel is not spinning to
it's max RPM.
EXHAUST TIPS Check and replace Exhaust Manifold and Gasket if leaking. Wrap
exhaust manifold in thermal tape to contain heat and improve thermal
efficiency, also reducing under hood temperatures. Fit more metal heat
deflectors reducing radiated heat damage to under hood components.
Detonation is to be avoided at
any cost.
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Warning, the All TURBO CLUB Register makes
this information available to you with NO express guarantee's implied or otherwise on the
suitability of the information being relevent to your Automobile Make or Model. You should
not make any modifications to your Automobile unless a qualified Mechanic has approved and
checked that the vehicle is safe and roadworthy and meets all relevent State Governed
Regulations before proceeding onto public roads. The information contained in this ATCR
Website is believed to be correct but the Author and Publisher make no warranties, express
or implied that the information is free of errors, or that it will meet the particular
requirements of individual Automotive application. |
