On some cars, it is impossible to install the thermostat upside down simply because it will not fit back in the housing. However, on other cars or trucks, it is entirely possible to install the thermostat backward and has been done by countless people. With this one, I am once again going to highly encourage you to follow your factory service manual for your car or truck. Every manufacturer is different in where they say the jiggle valve should go.
The jiggle valve positioning can also affect the entire cooling system on some cars and cause as much as an degree Celsius change in the temperature. That may not sound like a lot, but on a hot engine that is a big difference. The reason it is called a jiggle valve is that it typically has a little piece of metal that jiggles around inside the hole. Through my research, though I realize it serves an important function. The jiggle valve helps keep rust or other junk in the coolant from clogging the small opening.
By jiggling around as the coolant flows it breaks up gunk and keeps it from clogging the hole. A poppet style costs cost five bucks or less, a sleeve type costs 8 to 10 bucks. Poppet style is always wide open then closed tight, you can watch it on your temp gauge - always up and down. I think in Summit or Jegs they call the Sleeve type a high performance thermostat.
I know Robertshaw makes both types. That little hole will let all of the air in the block bleed out during fill, instead of having to fill it as much as you can, then starting the engine and trying to "catch" it when the T-stat opens to burp air. The little hole makes the process sooooo much easier. Originally Posted by rspears. I like the idea of the flange hole, sounds like something the factory should make standard.
Barely any heat from the heater! If they are in the mountains of AZ..??..?? On the Stant websight they stated that the thermo would fully open 15 to 20 degrees above temp on thermostat to that,s partly why I chose a Thanks guys!
Let us know how it works out! Loosen the hoseclamp with the screwdriver, and twist and pull the hose to remove it. You can leave the other end of the hose attached to the radiator. Remove the thermostat housing and thermostat. Loosen and remove the two bolts attaching the thermostat housing to the intake manifold. Gentle tap or pry to remove the housing. Remove the thermostat, and scrape the off the old gasket.
Place the new thermostat in your SBC's intake manifold with the pointed end up. Set the new gasket in place, and install the thermostat housing and bolts, using thread sealant on the bolts. Jun 27, 7. It's also not very effective for cooling. If he gets that car into traffic in hot air it could continue to spike on up since no water at any time is getting cooled in the hold position. IF the thermo or water pump are pooched just drop the level down and change them out, it's a quick job.
Also running a sbc on cool mornings with no thermo will drive the engine wear much quicker and won't be doing anything good. Jun 27, 8. Messages: 24, Likes Received: 1, You can run without a thermostat if the weather is warm enough.
The engine temperature will fluctuate with conditions because the thermostat isn't there to regulate temperature. In cold weather, the engine will never get warm, and if the weather is cold enough, the engine will be running to lean you might not be able to keep it running. Many years ago I bought a used Chevy pickup in the summer. It ran fine all summer. When Fall came, the temperature gauge wouldn't climb off the peg on the first cold day. I opened up the thermostat housing and it didn't have a thermostat.
It didn't hurt the engine. Also, back in the mid 70s, my employer had a Honda Civic. The thermostat failed in the fully open position in the middle of the winter when I was miles from home with it.
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