![]() ![]() It's hard to tell looking at new cars with the crazy shaped tanks they use. It seems like the plastic ones we used to buy as ad on kits in the 60s and 70s were about a quart. I'm trying to figure out how much coolant flows into the tank when the engine is at operating temp so I get one that is big enough with a little reserve. I suppose one of these tanks is ok as long as you use a cap of lower pressure rating than the one on the radiator so as not to impead flow to the tank. Some of the reservoirs have a pressure cap which is fine if you have a radiator that doesn't use a pressure cap on the spout. The tank should be about 40% full cold to make sure that the radiator is not drawing air back in when it cools and taking the radiator cap off to check coolant level doesn't tell you how much you have in the reservoir. They are designed to catch overflow so that it doesn't spill out on the race track. The problem I have with tanks like that Moroso is that you can't take the cap off to check your coolant level. It will have a screw on cap on the top of the reservoir to check/add coolant and the pressure cap on the radiator will not be removed once the radiator is filled. You just have to change to a cap for a closed system so that the coolant can draw back in when the engine cools down.Ī stock system will have the radiator overflow tube run into the bottom of the tank so that coolant will flow in and be drawn back out as needed. Otherwise something would have to blow apart when the engine overheated. Radiators have to have an overflow tube even if they don't have a tank and it just blows out on the ground. I hope this helps.I’m pretty sure they didn’t and the original doesn’t have the stem on fill neck to add a tank. The trick is to have a cooling system that keeps things in check. The cap is the pressure relief/safety valve should anything exceed what it should be and prevent damage to components. This is normal within the operating parameters of any engine. This would allow the coolant to expand over into the tank then get sucked back into the main cooling loop as it contracts. If you really want a "surge" tank (which we call it in my work world) you will need to have a tank than can be pressurized which means the tube from the radiator needs to be on the inside/pressure side of the cap seal and your pick up tube going to the bottom of the tank. I believe the drag rules intent are to make sure any coolant doesn't get spilled out onto the track therefore you will need a large enough tank with a manual drain to contain what you may overflow. Overflow tanks are just that - for overflow and collects what gets puked out. I do not think there will be too much coolant sucked back into the system prior to the cap closing back up. When there gets too much pressure from too much heat, it opens outward (from the radiator) and allows pressure to be relieved and coolant to dump out. The cap opens up as things heat up and pressure builds up past its rating. On an older system, you will see usually the puke tube is on the outside of the radiator cap sealing surface. This is where the pressure and coolant expansion is contained within the coolant system as the coolant heats up and expands. ![]() If you notice on newer cars, they usually have a reservoir that has a pressurized cap and is not on the radiator itself. I know what a coolant catch can is I'm not looking to just run that. Right now I just have a dangling rubber hose. To recap I like the idea of having an extra 6-10 ounces of coolant, then it would be one less thing to check every other time I drive Mercula. I don't understand how the vent line would work here, I wouldn't want it to vent from the button.? If I fill it to just under the cap hole it might puke some out, if I fill and just cover the fins I don't think any comes out. I'd like something that will suck the coolant back into the radiator. I need an overflow can if I want to make some passes at the track. I searched around, but if there is a good thread let me know and I'll just read that one.ģ50 SBC, supposedly crate, no idea on power ![]()
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