Question about expansion tank cap

first, given coolant mods are fairly common, but their implimentation vary grately,
does your expansion tank ONLY have the over flow hose from the supply tank into its bottom, with a drain off hose at the cap neck.

I have my "opinions" of how the coolant system "could" work, but I am new to the group so mine should be over ridden by those with more knowledge.

I invisioned the original designed expansion tank as an overflow reserve, thus the cap does not need to have a lower pressure seal and the cap mainly serves as a dust cover and top sealing used.

CORRECTION TO ORIGINAL REPLy

would it hurt if the expansion tank had a lower seal and a pressure setting...maybe. by having a pressure in the expansion tank it would increase the relief of the supply tank.

SORRY for the original erronoius posting

In my stock system, the expansion tank wasn't pressurized, and the cooling system blew and sucked through the radiator cap which was mounted on the swirl tank.

The cap I had on my original expansion tank just had a flat gasket. The cap had no springs, or any of the other "accoutrements" that a pressurized cap would have.

Carroll Smith only suggests one configuration in "Race to Win"... This is the same diagram George posts in his cooling system sticky.

Wouldn't having a lower pressure cap on the expansion tank effectively lower the pressure on the whole system (if you modify the system per the drawing below).....

Mike,

Assuming the cooling system is unmodified in terms of how it operates, assuming there's no "gotchas" to bite me on the arse, the expansion tank cap should NOT be sealed tight, it should be vented to atmosphere. Therefore the expansion tank actually operates as a simple recovery tank.

To be technically correct an expansion tank is a recovery tank that operates under pressure. Ford/De Tomaso literature refers to the tank as an expansion tank incorrectly.

Of course the whole concept of a coolant recovery tank was fairly new to the US auto industry in 1971. When Ford began equipping production cars with recovery tanks they were made of plastic and none of them had a pressure cap. Expansion tanks were European contrivances in that time frame.

The concept of a swirl tank paired with a header tank was foreign to everyone at Ford except those who had worked in the Indianapolis or GT40 racing projects. I have been fairly vocal about the fact that I suspect those two tanks were originally configured as a swirl tank and header tank. Whether or not that is true is a moot point in terms of functionality. If anybody wants the cooling system to automatically remove air from the radiator and isolate that air from the cooling system, that is how the system MUST be reconfigured. It is very easy to do.

Looking at my car, I'm not sure if the cooling layout change has been made or not.


The cap for the expansion tank had just a rubber seal, so it's sealed as I bought it and as it is running now.


The main tank is 100% full, and the expansion tank runs at 50% full. It all seems to work perfectly, even in traffic 150-180-150-180-etc.

I bought some rubber gasket material and plan to just put it back the way it was.

It WAS sealing, but the rubber was seriously degrading and decaying and falling apart into the cooling system.

I lined the cap with plastic to prevent any more crap from falling into the system, but the plan now is is to put a new rubber seal back on the old cap and run the car as it's been running, as it seems to be operating perfectly.

I am more used to the newer car setups that have an expansion tank with a small vent hole, that allows the coolant level to rise and fall without pressure changes to the expansion tank (unsealed) but since mine seems to be working well as a sealed setup, I'll just leave it alone for now.

Mike,

The non-pressure cap should readily be found at NAPA.

Are you sure your expansion tank does not have an overflow hose attached just below the cap neck?

Larry

hose #2 in this drawing

quote:

Originally posted by LF - TP 2511:
...expansion tank ...an overflow hose attached just below the neck...hose #2 in this drawing

You just need an old fashioned non-pressurized radiator cap for the "catch" can.

The "expansion" or "swirl tank" takes a 15 or 16 psi cap (I use a 16 but that is the safe limit of the old radiator with 50/50 anti-freeze). That gives me about a 245 degree safe limit and therefore makes 220-230 not a problem. In fact, that has a lot of benefits to it.

The expansion tank gets filled to the top. The catch can gets filled 1/2 way. It should also have an overflow hose on it. Run that down under the car so that if it does overflow at some point it doesn't spill anit-freeze all over the engine.

You should keep it as far away from the tire as you can too. Anti-freeze is slippery and that tire would spin if you overflowed while driving the car.

A couple of the Panteras that I have seen were running constantly with a couple of inches down from the top on the "expansion" tank.

It caused no problem for them. That does make sense because one of the reasons that tank is in the system is to provide a place for trapped air in the system to accumulate and not cause problems.

Some cars seem to do that more than others.

Mine doesn't but maybe that's because I was able to get most of the air out of the system and others weren't? I don't know the answer to that other than it doesn't seem to be a problem.

I do know more than a few aluminum radiators had to be replaced at about three years old due to holing through AND cracks in the tubes.

Once that happens with an aluminum radiator it's worth $.23 a pound in junk, because that's all it is.

Get a nice thick core brass radiator when you replace the aluminum. Those are repairable almost indefinitely.

The ONLY value of an aluminum radiator in a Pantera is to lower the cars weight. It DOES NOT cool better than the brass does. Anyone who tells you it does is shoveling horse manure. If you believe them then what does that make you? If you don't mind putting in a new $600 aluminum radiator every three years or so, then get what makes you happy.

The only thing is the aluminum have the damnedest tendency of "going" at the worst time and the worst place you can find. I'd rather be somewhat in control of that and at least I can get any radiator shop, anywhere to solder up the brass.

My car has the Fluidyne radiator, it MAY have a minute pinhole leak, but I'm not sure.

When I get gas at the station where the ground is uneven, I get a tiny puddle of coolant that drips from the right front.

When I check my fluid levels, they don't change.

When I look under the car, it doesn't drip, everything is dry, doesn't leave any drips on the garage floor, so I'm not sure if I have a leak or not.

I think there might be a channel where the coolant gets trapped, or collects, maybe from THE tiniest leak, or maybe from when we bled the coolant system recently.

In any case, presently, it's not leaking badly enough for me to do anything about it.

When the radiator finally blows, or starts leaking badly, I'm not sure what I'll replace it with.

Isn't there something that can be done to neutralize the electrolisis, so I can keep running my cool looking jumbo aluminum radiator? They sure do look a lot better.

If it comes down to having to spend a grand every 2-3 years on a radiator though, well, then brass it will be.

I don't spend any time looking at my radiator anyways lol.

quote:

Originally posted by mike the snake:
My car has the Fluidyne radiator, it MAY have a minute pinhole leak, but I'm not sure.

When I get gas at the station where the ground is uneven, I get a tiny puddle of coolant that drips from the right front.

When I check my fluid levels, they don't change.

When I look under the car, it doesn't drip, everything is dry, doesn't leave any drips on the garage floor, so I'm not sure if I have a leak or not.

I think there might be a channel where the coolant gets trapped, or collects, maybe from THE tiniest leak, or maybe from when we bled the coolant system recently.

In any case, presently, it's not leaking badly enough for me to do anything about it.

When the radiator finally blows, or starts leaking badly, I'm not sure what I'll replace it with.

Isn't there something that can be done to neutralize the electrolisis, so I can keep running my cool looking jumbo aluminum radiator? They sure do look a lot better.

If it comes down to having to spend a grand every 2-3 years on a radiator though, well, then brass it will be.

I don't spend any time looking at my radiator anyways lol.

I agree, they are pretty.

Google sacrificial anode. It will give you some ideas on how to do it.

I've seen some very nasty corrosion on aluminum intakes but in the Cleveland you don't need to worry about it because there is no coolant in it.

The water pump is pretty hefty but the radiator is rather fragile in regards to corrosion.

MTS,

did you every verify your tanks are plumbed as per original or that they have been modified?

quote:

Isn't there something that can be done to neutralize the electrolisis, so I can keep running my cool looking jumbo aluminum radiator? They sure do look a lot better.

See No-Rosion HyperKuhl. I use two bottles in my system. It is a water wetter plus corrosion inhibitor. You can buy it from Pantera Parts Connection.
Steve

"When I get gas at the station where the ground is uneven, I get a tiny puddle of coolant that drips from the right front."

The area the coolant is collecting is in the valence/front crossmember area, also known as a great sand and debris catcher that is difficult to clean and very prone to rust. A tough area to repair after the fact.

quote:

Originally posted by larryw:
"When I get gas at the station where the ground is uneven, I get a tiny puddle of coolant that drips from the right front."

The area the coolant is collecting is in the valence/front crossmember area, also known as a great sand and debris catcher that is difficult to clean and very prone to rust. A tough area to repair after the fact.

Yup! I think you have an issue on the bottom of one of the tanks.

Not only do the aluminum radiators hole through, unfortunately, the aluminum itself develops cracks longitudenally in the tubes.

They just appear out of nowhere and will continue to grow.

The aluminum just does not have the same duty cycle longevity as brass does.

Ironically I was just speaking to a friend and asked him about his three year old aluminum radiator in his Pantera.

He was like all these other guys who act like the aluminum is the best discovery since electricity.

You had to hear him curse out the aluminum radiator. The thing just virtually disintegrated literally overnight.

All the seams started leaking, cracks in all of the tubes, etc.

He has the original brass radiator back in there and just doesn't want to talk about this subject any more. LMAO!

Everybody thinks I make all of this stuff up?

Yeah, but they look SO cool! lol

When the time comes, I'll probably put a brass one in, as long as the install doesn't take a bunch of fab work.

I'm new to these cars, so I don't know if the Fluidyne was designed to just drop in or whether custom mounting was required.

At the auto parts store, I saw one of those caps with the anode, dangling on a spring, I think I'll install one of those too.

The Fluidyne is an exact replacement radiator.
If you don't have the original Detomaso radiator (maybe Roger still has it?) I'd recommend buying Hall's replacement brass one.

It has an extra thick core.

Gary called them the Phoenix radiators because that's where he supposedly tested them in the heat of the summer.
The "girls" don't know anything about that reference now so don't even bother to ask them about it. The one they sell IS the "Phoenix".

Look out for that dangling anode. It will begin to dissolve as a result of galvanic action and if it isn't made with a securing wire core, then it could drop chunks into the system as it dissolves.

Check the manufacturers information on it before you put it in and forget about it?

http://www.summitracing.com/pa...se3eFto8yhoCK7zw_wcB

quote:

If you don't have the original Detomaso radiator (maybe Roger still has it?)

I have my original radiator if you'd like it. At minimum, it probably needs to go to a local radiator shop to be rodded out and have the tanks re-soldered. At the worst, it might need a new core; a competent radiator shop could tell you. I had the same symptoms you describe, so I installed a new copper/brass radiator from PPC Reno (Larry Stock) about 7 years ago. I was going to rebuild my radiator, but Larry had them in stock and I was trying to get my car back together in time for Concorso.

Anyway, I still have the original and you can have it if you want.

FWIW, the Phoenix radiator from Hall is an extra large extra capacity radiator, not a stock replacement.

As far as cooling capacity, I've never had any cooling issues with my stock style radiator, including sitting in 100 degree weather in stop and go traffic on Hwy 17 going over the hill to Santa Cruz.

Garth I might take you up on that offer for that radiator.

I do know I want to have bulletproof cooling on my car.

So far, I have 4 or 5 hours driving in my car, 2 or 3 of which are after fixing the car.

So far, it is running sweet. My gauges are all telling me the right info, no leaks (at least nothing is dripping from under the car after drives)and it seems to just run perfect, so I'm happy again.

I don't trust the radiator in the car though, and I expect to have an issue with it sometime in the future.

I think it has a Teeeeeny pinhole leak, that's causing that little bit to collect in the front of the car and leaks when I go to that particular gas station.

I expect that to get worse over time, to the point where I'll be needing to replace the radiator, but I want a jumbo, beefo, ultra radiator that can handle long periods of traffic, the way it can now.

Presently, I can sit in traffic for hours and watch the gauge go 150-180-150-180 all day.

I want to keep it running that way.

When the time comes to replace my radiator, whether it be aluminum or brass, I just know I need it to perform.

Once you get into the US L version of the car, it has the details worked out.

All that ANYONE NEEDS is a stock L brass radiator. As Garth pointed out, they handle hot desert conditions in traffic with the A/C on with NO PROBLEMS.

Lots of these issues that you hear of with Panteras are PRE L issues and there seems to be some type of mass hysteria with the people who buy these cars.

The Funkle brothers, Simon & Gar, once wrote, "the words of the prophets are written on the subway walls, and tenement halls". I think that's where some people get their Pantera information from?

I have read about the pre-L models having overheating issues in traffic early on.

I'm not buying into any hype, I just want my car to run without issues.