Coolant Resevoir Vent question

[BlackandYellowBanshee]

Odd question. Trying to clean up the vent hosing on my quad. Shorted it up and ran it thru the CDI wiring eyelet. I figured out really quick that a short run like that being at the back of the bike spills coolant when riding aggressively. I feel dumb for even considering that to work right. So my question is.... can I run a gas cap vent on the short run of tubing to prevent leaking and still vent the res. I guess I’m trying to wrap my head around which way air flows, as I don’t want to cause a vacuum effect, if that’s even possible. Thanks!

[hoppedupandcutdown]

Yes, that will work. Until it gets hot enough and purges coolant into the bottle and the rubber cap or hose will HAVE to give.

[BlackandYellowBanshee]

Basically, just forget about it and run it back to the front? It’s not like it’s killing me, it would just be nice to cut down on wires/tubing running down the frame.

[hoppedupandcutdown]

You can omit it completely and just run 1 hose from the neck down to the pipes like 90ish% of Bangshees

 

[Ayesully810]

Just cut It and zip down it going straight down on the front of the frame

[ginger]

i assume your not running the coolant tank?  I made a remote mount for my tank and mounted it in the front of the bike. 

 

[ZillaFreak]

I ran a coolant overflow tube that was maybe 3-4 inches long. It came out of the radiator, made a 90* bend upwards and that was all. Never had an issue. It will leak coolant at first till the coolant levels drop enough to where it is "full" at operating temps.

 

Make sure your cap is good though.

[ginger]

you will actually get much better and consistent cooling with a expansion tank. just so you know.  as the radiator will recover any fluid it pushes out when it cools back down, and will constantly be filled. 

[ZillaFreak]

i have never seen an increase in cooling effect because of an overflow tank at operating temp. It will not help the cooling effect of a radiator at operating temps as the fluid will be in the overflow tank and not in the radiator to be circulated. It doesn't go back into the radiator till the coolant temps start to drop, then the excess coolant in the tank starts to go back into the system. The coolant in the system has to cool first, and the tank had zero to do with it cooling. 

[ginger]

it does because it keeps air from entering the system, the less air you have in the system the better the cooling will be.   even though when your up to temp your coolant will expand you can get air pockets trapped into the system, making the cooling not perform 100%  

 

[ZillaFreak]

If you do get air into your radiator, it would be trapped at the highest point of the coolant system, air is lighter than coolant. So as soon as it gets hot again, it will push the air back out the cap. 

[ginger]

the cap technically isnt the highest point in the banshee system considering the radiator is on an angle. the top corner is a air trap. 

[ZillaFreak]

4 minutes ago, ginger said:

the cap technically isnt the highest point in the banshee system considering the radiator is on an angle. the top corner is a air trap. 

So please explain how the cap isn't the highest point in the banshee system?

 

[ginger]

it all goes by where the base of the neck mounts to the rad.  with the radiator mounted like it is slightly tipped back, you have a chance of trapping air where i have the red line.  THe stock radiator is less prone then the aftermarkets are. 

[ZillaFreak]

You do know that with the slight chance it might catch air there, it will not effect the cooling efficiency of the system right. What little air that might be there would be above the inlet of the radiator. It is also lower the the overflow nozzle. You can run without a coolant tank and it will not have any effect on the cooling capacity of the system. 

 

If you are worried about cooling capacity, get a bigger radiator (thicker core, more core, bigger with more fins).