Effects of running without thermostat?
i ran my old car with no thermostat for 2 years with zero issues. altho it will run cooler on highways and lil bit hotter on idle. we have no winter so i had no problem with hvac. but in the end its just useless to run no thermostat.
There are a lot of things in the PCM that index off ECT.
Like whether or not you're in closed loop, and if not the
mixture is pushed all around by it.
If you want to tune it tight you have to give it a tight
environment.
Like whether or not you're in closed loop, and if not the
mixture is pushed all around by it.
If you want to tune it tight you have to give it a tight
environment.
You also wanna make sure the oil temp and coolant stay the right temp to burn off moisture in the system. The t stat has a very important role in that. Not to many guys realise these engines were designed to maintain coolant temp of at least 190f at all times. Oil temp should be at least 200f at all times. Thats why I will never use anything other than the stock t stat. If I wanna keep the engine from overheating, programing the fans is the way to do it.
Teching In
Joined: Oct 2004
Posts: 43
Likes: 0
From: D/FW Area
Lovescamaros28,
At the 0.5 to 1ish kg/s that engine coolant is flowing through an LS1, there is plenty of time for coolant to pick up engine heat. The reason the engine is running cooler, more coolant is flowing, ie no restriction. More coolant through engine, more coolant through radiator, more heat exchanged.
At the 0.5 to 1ish kg/s that engine coolant is flowing through an LS1, there is plenty of time for coolant to pick up engine heat. The reason the engine is running cooler, more coolant is flowing, ie no restriction. More coolant through engine, more coolant through radiator, more heat exchanged.
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TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
With no thermostat, if the bypass port is not blocked off, then instead of coolant flowing solely from the block to the radiator only, a large amount of coolant goes thru the bypass port and circulates back into the block (i.e. bypasses the radiator);
this won't necessarily cause overheating, it just reduces the cooling ability.
this won't necessarily cause overheating, it just reduces the cooling ability.
Registered User
Joined: Jul 2012
Posts: 1
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It is possible to run coolant through a radiator too fast. The equation mentioned earlier about Q = MC delta T is only part of the calcs used for heat transfer. There is anther principle that directly contradicts this equation I believe it is referred to as Reylonds number. As fluid flows through the inside of a radiator core think of air flowing over a pickup truck. Although the core looks smooth to our eye it is rough on a microscopic level. Like a pickup truck driving down the highway all the rough spots create vortex (the way the air moves behind the cab making a giant circle) where the coolant is not touching the core. As you accelerate the fluid the vortex become larger thus even less coolant touching the core. Whether or not removing the thermostat will create the coolant to flow fast enough in certain radiators for this to happen I'm not sure. But I have heard this rumor a lot and tend to believe it is exactly what is happening. Depending on what radiator your running and the smoothness of the inside of the cores this will vary. May explain why some people have no problems and others do.
