is there anyone in here running a gutted thermostat or no thermostat at all?


what happens if you start your car with the filler cap off?

 

Please search dude. Running with no t-stat = very bad idea. Running with gutted t-stat for a street car = bad idea, atleast in the cooler months.

And nothing will happen if you start the car with the filler cap off, unless it's a hot start and the coolant is above 212F......

https://www.rx7club.com/showthread.p...ght=thermostat
https://www.rx7club.com/showthread.p...ght=thermostat

 

well, i actually have a mazda 80c thermostat, but the rubber in the middle of it that seals it up tight is gone, so its kinda like a "drilled" thermostat with 6 small holes in it. i guess its not totally gutted, just lets more coolant flow through before it opens...

 

I ran my car with no t-stat for ages.

Its not a bad idea, the car just takes AGES to warm up. The car overfuels when its cold and oil flow is restricted. Apart from that, there is no effect/benefit of it.

 

okay...

I would insist those ARE bad things and both are easily prevented...


If your car is overheating while the thermostat is fully open then removing or replacing the thermostat will make absolutely no difference! Thermostats merely allow the engine to warm up quickly, they do not regulate peak coolant temps. The radiator does that.

 

If you run with no t-stat, in very cold weather, your car may NEVER get up to proper operating temps. That would mean no opportunity to boost the car safely .

 

The thermostat in our cars is called a bypass type because it seals the warm up bypass passage when it heats up. If you put one in a pan of boling water, that's the plunger that extends from the bottom. No thermostat means the bypass passge is open all the time, reducing cooling capacity. Racing Beat claims that it reduces cooling efficiency by 30%, which isn't noticeable in normal unstressed driving, but any stress(AC on a hot day, extended uphill runs, racing, etc) will more likely cause overheating.

Jacob, what you're describing is a zero pressure thermostat, that's what Evans reccomends for it's no boil waterless coolant. It's also a standard trick to keep engines with bad orings from over pressurizing the coolant. The problem in an FD is the pressure is really esssential to keep the coolant from boiling, since it runs so hot. You need to run pretty much straight antifreeze to prevent boiling if you run zero pressure, never a good idea. If that was the thermostat in the car, the previous owner knew it had bad orings when he sold it. Unless he had Evans coolant, there's no way anyone would put that in a fresh rebuild.

Paul

 

That is incorrect. What Evans recommends is 0 or low pressure in regards to pressure cap. Thermostat has no effect on system pressure, only on flow. The only thing that could possibly be argued is that removal of the thermostat may reduce pressure in the water pump housing and increase the possibility of cavitation. If you want to run 0 pressure cooling system remove the rubber seal from the sprung part of your pressure cap, forget about the t-stat.