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Been looking at routing diagrams for an expansion tank. My radiator cap is lower than where I would put an expansion tank at. Will this routing work and I’ll cap off the original radiator cap vent?
Here’s my problem, I have the radiator cap on the inlet of the radiator. This is the “high pressure” side of the radiator. And at sustained high rpm, the restriction of the radiator itself causes the pressure to overcome the cap and it fills my overflow tank. I want to add a surge take because that’s plumed into the low pressure or suction side of the system.
If I plumb a rad vent from the high pressure side to the tank, like shown in pic 2, then the problem will still be there. So I should plumb a vent from the outlet side end tank of the radiator correct?
It's been a long time since I did mine on my S10. I followed what GM did on the trucks. I can't remember if they tied the surge into the 3/4 heater hose or the 5/8, but they only tied into 1.You can run a higher radiator cap in your upper hose, but personally, I'd remove it all together. I just don't like the idea of one more possible point for coolant to come out. Having a surge tank really does make a big difference. I've got data that backs it up. I'll never do one without it, there's just not reason to.
Now, I do also agree with the overflow bottle, but if you look at the new Mustangs, they don't run them.
I say this, because at a race event, we had a tech inspector tell us we couldn't run. I then pointed out the 9 new mustangs, and said well I guess they can't either. Eventually, once I showed him, we were allowed to race.
There is a calculated percentage of fluid, you are supposed to have setup, for a surge/expansion tank. I typically use one for a Ford, but there are lots of shapes and sizes in many different cars.
I don't think I directly answered your question, but hope it helps.
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Surge Tank Question 
