Question about 1989 Mazda RX-7

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1989 mazda rx7 turbo over heating

The engine temp runs at about 72 deg at 120km/hour and elect fan is set to cut in at 82 deg ,but at low speed 80km/hour the temp will go up to about 84 deg and the fan is working and cooling. but if the engine is turned off ,the engine will start to boil and will force water out the overflow and the water in the engine is thumping loudly.but if you idle the engine for about 5 mins it might not boil .I have changed two thermostats with the same results. the engine temp at 72 deg is to low,it should run at 82 deg all the time and the turbo is not red hot , but turbo is oil and water cooled the water feed for the turbo comes from the back rotor and returns by the front rotor just under the thermostat.With turbo water returning under the thermostat would it make thermostat stay open?
so should i make the return hot water go in the top radiator hose so it can be cooled in the radiator
I am only making about 250 hp. when my overheating problem is solved we will increase the boost from 6psi to 12psi and look for about 450hp at 9000 rpm

thanks
ben

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Hi and welcome to FixYa,

A couple of ideas you may want to explore:

  • the engine overheating after a shutdown could perhaps be addressed by installing a time delay off on the relay of the radiator fan. The idea is after absence of Ignition B+12 (engine off), the fan/relay should still be energized for a number of minutes so as to cool the radiator;
  • idling the engine for about 5 minutes before shutdown is a good practice. this enable the engine to cool slowly rather than an abrupt change in temperature of the external but the inside is still rather hot;
  • the opening of the thermostat is triggered by the temperature of the water above it not below (where the spring is);
  • in my country, where it is relatively always hot, some mechs remove the thermostat (of course not applicable in cold climates);
  • a more helpful idea would be the installation of an electric water pump in lieu of the mechanical one. There are several after market models. Pls try here, here or here for a start;
  • it is also possible to wire the electric water pump to still run for a minute or more similar to the proposed time delay for the radiator fan above.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 07, 2008

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If our engine run at 82 celcius there no reason its start boiling when you turn it off its normal for temp to raise when you turn off the engine but to start boilling thats mean our temp is higher then 84 degre check our gauge manuelly check the temp with a thermometer directly in the radiator and compare with the gauge that mean the faster you go colder its get so the radiator does its job but what weird it goes up at lower speed so not enought air goes trough the radiator are you missing a front spoiller that redirect the air to the radiator if you raise the boots you gonna have to raise the cooling capaciter of the car check it out let me no. . pierre

Posted on Dec 07, 2008

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