Can I run my 94 rx7 without a thermost.I only take it out in the summer it's so that it runs cooler or a replacement of 50-60 degrees celcius and where I can get one. please let me know if anyone out there knows.

Thanks fcapo

 

I don't have any experience running an FD without a thermostat, but I do know that you can't just pull it. If you do, the engine will overheat.

When the engine is cold, and the thermostat is closed, the tstat is blocking flow through the radiator, and forcing coolant to recirculate through the engine.

When the tstat opens, it blocks the passage that allows coolant to re-circulate through the engine, and opens the passage that sends the coolant out of the engine, into the rad, and back into the engine coolant intake.

So, you can't run without a tstat without permanently blocking that passage for engine only circulation, the coolant will not go through the cooling system.

 

Wrong, actually you can run your FD without a thermostat,.

The only issue is that it will take longer for your engine to heat up, and if it's cool outside and you're cruising, your engine pretty much won't get up to proper operating temperature, which means boosting is a no no.

It was about 10-15°C outside when I was cruising to parry sound in my FD, my average temperatures were under 60° the entire trip. I also never put two and two together and realize that i had no thermostat when my water temperature sender (which was tee'd into the upper radiator hose) was actually warming up slowly with my car. With a proper working thermostat, that temperature gauge should read 0 and then almost all of a sudden jump up to about 80°C once the thermostat opened.

Yep, it was the previous owner who had removed the thermostat. I hope it wasn't due to cooling problems, this weekend's 30°+ weather should tell me anyways.

This is a picture of what I took out of the car, and the proper mazda thermostat that I replaced it with.

 

leave the thermostat alone

 

Running without a thermostat can cause issues. The reason being is that the thermostat is also a restriction in the cooling system. This allows the coolant to spend more time in the radiator thus allowing it to release heat, carrying it away from the motor. Remove that restriction and the coolant will spend less time in the radiator thus retaining more of its heat each pass.

Just cruising on the streets may not make this noticeable. However, if you start pushing the car car, it will be.

 

My mistake apparently. As I said, I haven't run without a tstat.

The part about how the tstat works is however correct.

Running without a tstat requires blocking the recirculation passage.

This is generally done only on road race cars AFAIK.

There's a number of posts here regarding that if you do a search.

 

I wouldn't take the thermostat out completely. I would just cut the guts out of the t-stat but leave the outside. That way it leaves something for the seal to be reinforced with and it will provide some resriction for the coolant to stay in the radiator.

 

or you can just drill your thermostat tu allow some more coolant to flow in the rad all the time.

 

The question no one has asked is...why do you want to do this? If your car is running hot, especially in a Canadian environment, I would say there is another culprit to investigate, you know? If the car is not running hot but you think you might be 'helping' to keep it cooler, please re-read Mahjik's post. Fast flowing coolant does NOT give up its heat well. A lot of people over the years, in ALL types of cars, have learned this lesson to their chagrin.

Nice avatar, by the way.