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A common problem with the V8 Datsun Z is overheating. Generally, they overheat due to insufficient air flow through the radiator, and because of inefficient radiator designs. Some radiator designs restrict the air flow through the radiator. For example, a 4-row radiator is so thick, that an electric cooling fan cannot easily move air through a 4-row radiator. A 4-row radiator normally requires an engine-driven fan to draw air through the radiator. The most practical way to cool a V8 Z is with an electric cooling fan and a radiator that allows air to easily flow through the core, while transferring heat into the cooling air. Most modern cars use electric cooling fans, as well as radiators that allow air to easily flow through the radiator. All-aluminum racing radiators are often recommended for V8 Z cars. On the internet, there are many V8 Zcar experts giving out not-so-expert advice. Cooling tips On many engine swaps, the car overheats even though all the right parts are used. Often the overheating is caused by too much anti-freeze. Never use more than a 50% mixture of anti-freeze. Some V8 Z cars overheat because the engine is poorly tuned for street driving. We have seen cars with aftermarket programmable fuel-injection overheat because the ignition timing was extremely retarded. In one case, the owner was running no part-throttle ignition advance— the car got horrible gas mileage, and it overheated. Running vacuum advance is important to prevent overheating. The genuine Chevrolet base radiator for the 1984-1986 Camaro has a core that is only 7/8″ thick. Also, the Genuine Chevrolet radiators sometime have cosmetic problems (bent, or unevenly spaced fins) which has caused complaints. The aftermarket radiator shown above is better than the genuine Chevrolet radiator, costs less, and has fewer cosmetic problems. It also has a thicker core, which is 1-3/8″ thick, and has 18 fins/inch. Radiator core design On the left is a modern style radiator core. The tube width is 1-1/4″, and the tubes are spaced at 7/16″ interval. The wide tube has more surface area that contacts the cooling fins than the radiator cores shown to the right. The better surface area results in better heat transfer.
Tags : programmable fuel injection, electric cooling fans, electric cooling fan, radiator core, datsun z, row radiator, genuine chevrolet, vacuum advance, engine swaps, z cars, horrible gas, cosmetic problems, gas mileage, driven fan, modern cars
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