no thermostat
08-15-07, 07:52 AM
#2
Racecar - Formula 2000
Bad idea!
Bad!
08-15-07, 08:46 AM
#4
Racecar - Formula 2000
1. Coolant will cool faster with faster flow (less boundary layer => better heat transfer).
2. With faster flow, coolant will be at a more constant temp throughout the system (cooler in the engine, warmer in the radiator => more heat transfer, plus less thermal gradient in the engine => parts expand more equally).
So, faster flow is not the problem. The problem is that the engine will in most cases, w/o a thermostat, never reach proper operating temperature, and will run inefficiently, plus controls that transition after the engine has warmed up may not be activated.
The old saw that slower flow => better cooling comes from needing (in some cases) a restrictor at the engine outlet so that the WP causes a pressure build-up in the block, helping to prevent localized boiling and the resultant poor heat transfer at the boiling points. This localized boiling is sometimes unstable, in that once it starts, if it is bad enough, cooling efficiency can be degraded to the point that overheating will result, and coolant will be lost.
2. With faster flow, coolant will be at a more constant temp throughout the system (cooler in the engine, warmer in the radiator => more heat transfer, plus less thermal gradient in the engine => parts expand more equally).
So, faster flow is not the problem. The problem is that the engine will in most cases, w/o a thermostat, never reach proper operating temperature, and will run inefficiently, plus controls that transition after the engine has warmed up may not be activated.
The old saw that slower flow => better cooling comes from needing (in some cases) a restrictor at the engine outlet so that the WP causes a pressure build-up in the block, helping to prevent localized boiling and the resultant poor heat transfer at the boiling points. This localized boiling is sometimes unstable, in that once it starts, if it is bad enough, cooling efficiency can be degraded to the point that overheating will result, and coolant will be lost.
08-15-07, 10:01 AM
#6
A rotary will actually run hot without the thermostat. The way the thermostat in the RX-7 is designed is that when the engine warms ups and the thermostat opens, the plunger on the bottom of the thermostat covers the bypass hole in the water pump. If you have no thermostat, then the bypass hole is always open and a lot of the coolant will flow through the bypass hole and never go through the radiator to be cooled.
08-15-07, 10:05 AM
#7
Bang Bang!
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great explanation thanks..
im gonna trow on in asap..
i drove with out one for about 3 weeks and my temps were always around 92-100 celcius do u think i caused any damage?
im gonna trow on in asap..
i drove with out one for about 3 weeks and my temps were always around 92-100 celcius do u think i caused any damage?
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08-15-07, 10:10 AM
#8
You probably didn't do any damage. Most of the time damage occurs from a rapid rise in temperature such as happens when you break a hose or belt. The rapid rise causes the aluminum rotor housings to expand so fast that they get crushed between the irons.
08-15-07, 10:15 AM
#9
Bang Bang!
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okay so i should be good then.....
idk if this would have anything to do with it but last night my car cranked 4 times before starting up when before it only took 2 cranks??
took 4 cranks this mourning too??
idk if this would have anything to do with it but last night my car cranked 4 times before starting up when before it only took 2 cranks??
took 4 cranks this mourning too??
08-15-07, 07:22 PM
#14
Eats, Sleeps, Dreams Rotary
good read for a race car....prob not a good idea for a street car
http://www.mazdamotorsports.com/weba...ubject=cooling
http://www.mazdamotorsports.com/weba...ubject=cooling
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