Inline coolant (delete overflow)

[jmw241]

Does anyone here have any experience running an inline coolant filler. Basically you eliminate the overflow tank and just run a looped system.

I would have to relocate the coolant tank sensor somehow I think. What would be the downside to doing this, other than the obvious, of not knowing how much coolant is in the system, or having any extra. (both could be bad :-P)

Any input? I could also try to relocate the tank somehow.


edit: Something line this http://www.streetperformance.com/m/c...se-filler.html

[[email protected]]

And what do you plan to gain from this...no coolant tank in the engine bay?

[jmw241]

And what do you plan to gain from this...no coolant tank in the engine bay?

Exactly, over the next year or two, my car will be going from more or less stock, to show status. I am getting the "easy stuff" out of the way now.

With a coolant reservoir delete, plus the new podi coolant line relocate (under the intake manifold) I think it will be looking good. I plan on relocating the hydraulic reservoir aswell :-)

[manhertm]

Exactly, over the next year or two, my car will be going from more or less stock, to show status. I am getting the "easy stuff" out of the way now.

With a coolant reservoir delete, plus the new podi coolant line relocate (under the intake manifold) I think it will be looking good. I plan on relocating the hydraulic reservoir aswell :-)

Hmm, how safe is this? Wouldn't this make coolant temps rise?

[jmw241]

Back from the dead - anyone have any input on this?

[old guy]

I would think you would need to incorporate a buffer tank somewhere. It wouldn't have to be underneath the hood. Maybe you could locate it under the front fender beside the vacuum reservoir. Without an air buffer (like what the coolant reservoir provides) you are very likely to blow hoses off when the coolant heats up and expands. You will also have hoses collapse when the coolant temperature returns to ambient. Currently the air space in the coolant reservoir provides this function.

[Turbavanttro]

^^^this. You need expansion/contraction capacity somewhere in the system.

[Dubdaze]

Then how does every Vw with a shaved bay have no coolant bottle, but a Audi a4 has to have one?

http://i84.photobucket.com/albums/k3...a/100_0402.jpg

you can use a small one and run it on a heater hose by the battery:
http://i35.photobucket.com/albums/d1...n/DSCF5420.jpg

[jmw241]

What makes the A4 different than Vw's?

[Charles.waite]

Then how does every Vw with a shaved bay have no coolant bottle, but a Audi a4 has to have one?

http://i84.photobucket.com/albums/k3...a/100_0402.jpg

you can use a small one and run it on a heater hose by the battery:
http://i35.photobucket.com/albums/d1...n/DSCF5420.jpg

I think everyone above maybe assumed the OP wanted to actually drive his car. If its destined to become a show car, coolant capacity is mostly irrelevant I would think. I know nothing about this though.

Just make a custom coolant tank and hide it somewhere.

Also Old Guy never said you couldn't do it. He just laid out the technical reasons the coolant tank should have open airspace.

[old guy]

What makes the A4 different than Vw's?

Nothing. Personally I wouldn't do it on a VW either. Or any car for that matter. Coolant expands when it gets hot. It can expand up to 4.7% of its total volume from room temperature to 180°F. It expands up to 6% at operating temperatures around 2110 -212°F. It's going to go somewhere. If you don't allow for expansion your coolant hoses are going to have to balloon out a little to accommodate this. A very small % of the total coolant volume resides in the hoses but all of the expansion will have to occur there. You get the picture. Sounds like a recipe for blown hoses to me. Or you can run a pressure regulating filler cap and puke out the coolant when the motor heats up. Then you will have to contend with collapsing hoses when the motor cools down or sucking air into the system which will cause additional issues as the air gets heated up and pukes out even more coolant the next hot cycle.

You asked: That's my opinion.

[KFizz]

Then how does every Vw with a shaved bay have no coolant bottle, but a Audi a4 has to have one?

http://i84.photobucket.com/albums/k3...a/100_0402.jpg

you can use a small one and run it on a heater hose by the battery:
http://i35.photobucket.com/albums/d1...n/DSCF5420.jpg

By the way. Both of these setups look like ass.

[ANDROID184]

It can be done, just have to figure out the right psi rad cap to use, and figure your plumbing out
Just quick pics I had in my photobucket

[blackfc3s]

I think KISS applies here. Function over form.

[old guy]

Here's the deal looking at this pic. See the small line below the cap? That's a blow-off line for when the coolant expands. If you could trace it to its end you will find an overflow reservoir. the end of the small line will be below the coolant level in the overflow tank. When the coolant expands to above the cap pressure the coolant blows into the tank. When the coolant cools and decreases in volume the coolant is pulled back into the main system. That's what you need.



And I absolutely love those carbs on the white v-dud. Weber DCOE's. Used to put those bad boys on everything I owned!

[ANDROID184]

I had a set of 45's for my 16v, that never got to fruition. But i've been in a few with 40's and 45's, sex too the ears even on a 4 cyl.

--edit
I would do a overflow canister of somekind, just it case......esp if it will be a dd, or a weekend car and not a strict show car.

[Charles.waite]

I think KISS applies here. Function over form.

KISS does apply but Function doesn't really even matter. For a show car, Form is all that matters. Hence the desire to delete the Coolant expansion tank: it looks ugly.

[old guy]

I had a set of 45's for my 16v, that never got to fruition. But i've been in a few with 40's and 45's, sex too the ears even on a 4 cyl.

For sure! If you had twin 45's on a 16V I can see why you couldn't tune them in. Shoulda run some 36-38mm choke tubes and you would have been golden.

[ANDROID184]

[Staz]

wake this thread up .. soooooooooo has anybody completed this on their a4 ?

[CyberPMG]

Seeing that this keeps bumping with no answer, I would say that nobody has done this to any B6 A4/S4.

[Low-n-Slow A4]

If I were to do something like this, I would relocate my battery to the trunk and get one of the VW ball reservoirs and relocate it to where the battery originally was. It would be out of sight under the rain tray.

[Norm209326]

If I were to do something like this, I would relocate my battery to the trunk and get one of the VW ball reservoirs and relocate it to where the battery originally was. It would be out of sight under the rain tray.

Has ts quirks though.

[Norm209326]

Better pic

[Audihere!]

Back from the dead - anyone have any input on this?

Look into "waterless coolant" made by Evans, you can delete the overflow tank according to their rep due to the fact that their coolant does not build pressure at operating temp... so little infact, that you could take the radiator cap off with the car at full operating temp. The boiling point of their coolant is substantially higher than standard coolant that is mixed with water. Its pricey at $43-50 per gallon and you do have to use their prep too in order to rid all water from the system but it has a lifetime warranty or somethin crazy and will outlast the engine. You can even drain it and reuse it if need be apparently.

[diagnosticator]

Look into "waterless coolant" made by Evans, you can delete the overflow tank according to their rep due to the fact that their coolant does not build pressure at operating temp... so little infact, that you could take the radiator cap off with the car at full operating temp. The boiling point of their coolant is substantially higher than standard coolant that is mixed with water. Its pricey at $43-50 per gallon and you do have to use their prep too in order to rid all water from the system but it has a lifetime warranty or somethin crazy and will outlast the engine. You can even drain it and reuse it if need be apparently.

The Evans coolant is pure propylene glycol. The use of this coolant without water, allows a high system coolant temperature without boilover. Since it has a high boiling point, hot spots in the engine that are hot enough to boil ethylene glycol/water coolant, will become much hotter because steam at the coolant/engine metal interface, is a poor conductor of heat. These boiling areas also can be damaged from cavitation as the steam bubbles collapse creating large shock forces on the surface material, eroding the metal away. Propylene glycol will maintain effective cooling of the highest temp hot spots, preventing knocking and engine damage from high temperature differentials in the engine.

Propylene glycol is also non toxic, and used as an ingredient in many foods and beverages as well as pharmaceuticals.

As used by Evans, the coolant flow is reversed, flowing through the head then down through the cylinder cooling jackets then to the radiator.