Champagne bubbles, but passed block test/hydrocarbon
#1
Champagne bubbles, but passed block test/hydrocarbon
Ok, I've been anxious for a long long time about little bubbles that I see in the filler neck. Up until 140F, the filler neck is flat, at 140F-180F I start seeing bubbles appear....tiny bubbles like dust rising to the surface. If I rev the engine to 5-6k, the bubbles increase to tons of little bubbles. Agains, the bubbles do not break on the surface and slosh coolant out, they just look like carbonation.
So I took it to Express Oil and watched the guy hook up a cylinder filled with blue fluid on top of my fill neck. The bubbles traveled into the fluid but it never changed colors. He let the engine run for about 3 mins and revved it up a few time...still no change in color meaning no hydrocarbons detected...so WTF is going on?
So I took it to Express Oil and watched the guy hook up a cylinder filled with blue fluid on top of my fill neck. The bubbles traveled into the fluid but it never changed colors. He let the engine run for about 3 mins and revved it up a few time...still no change in color meaning no hydrocarbons detected...so WTF is going on?
#5
All of my hoses have been replaced....the only thing I can think of that could ever cause a leak would be the drain plug on my koyo radiator, its cross-threaded in. However, I haven't moved it since its cross-threaded and it has a rubber gasket sealing it....no leak at all, even under pressure.
#6
NizzleMania Productions
iTrader: (5)
maybe the system needs burping? just trying to rule other things out... I have heard that certain issues with a pulley can cause abnormal water pump cavitation which might cause these fine bubbles but I can't confirm... been a long day.
would be interested to know what you find out.
would be interested to know what you find out.
#7
maybe the system needs burping? just trying to rule other things out... I have heard that certain issues with a pulley can cause abnormal water pump cavitation which might cause these fine bubbles but I can't confirm... been a long day.
would be interested to know what you find out.
would be interested to know what you find out.
Yea...a small pulley at high rpms will cause cavitation...however I have a larger WP pulley
Seriously, the coolant fizzes up when I rev and hold it at 4.5k....then when I let of the throttle, the coolant settles with a few tiny bubbles. This is pissing me off.
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#8
Racecar - Formula 2000
One thing I can think of that may account for your bubbles - air will dissolve in water. However, the warmer the water is, the less air it will hold. In addition, the rapid pressure decrease and turbulence of the coolant passing through the thermostat will tend to cause that dissolved air to separate into bubbles. The higher the coolant temperature and the faster the water flow, the more this will happen. So what you are seeing is not, IMO, abnormal. The champagne-bubble test is probably only valid at low RPM's.
#9
NizzleMania Productions
iTrader: (5)
iirc I dont think I have seen a champagne bubble test done other than at idle. Maybe that's one of or the main criteria for doing the test.
Honestly, I never thought of testing at higher idle, but I would imagine it would skew the results the way compression readings would show slightly higher values if the cranking rpms were done at 1,000 instead of 250... right?
Honestly, I never thought of testing at higher idle, but I would imagine it would skew the results the way compression readings would show slightly higher values if the cranking rpms were done at 1,000 instead of 250... right?