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Thread: Foaming expansion tank at revs/ coolant overflow/ what tank do I have?

  1. #11
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    Feb 2009
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    Quote Originally Posted by fatallightning View Post
    that appears to be the same tank I have, any idea where it's sourced from?
    Its off a Rover 200/400 up to 1995. The Rover was derived off a Honda in a pretty basic form of engineering, so there is a Honda part equivalent out there. The tall back leg is cut down to suit where mounted.
    https://rimmerbros.com/Item--i-EAP8713
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration finished - track set up time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore SS Group A (suspension restoration)
    1985 Holden Commodore Group A (suspension set up)
    1982 Ferrari 400i (radiator replacement)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (dyno time)
    1990 Range Rover 2 door Classic
    and another project car coming....

  2. #12
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    Feb 2012
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    Roswell GA
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    Does the overflow tank need an overflow tank?
    Life happens while you're making other plans
    1995 Caterham Crossflow RHD
    1990 Miata
    2007 GMC Sierra WT
    2013 Mini (Her's)
    2014 Outback
    JOHN DEERE D130

  3. #13
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    Sep 2006
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    Guys not to be a downer, but I chased bubbles at high revs pressurizing my coolant tank for a couple of years. Tried Evans coolant. Replaced water pump,radiator, installed one way valves and moved the headertank to the highest point. Tested for exhaust gases in the headertank. Negative I installed a higher pressure cap which worked a little better but I still got pressure build up at track revs.

    After each track session I would winch my car up the trailer ramp to put the tank as the highest point. Bubbles would bleed up into the tank and the level in the tank would go back down to normal. It did appear that the higher pressure cap prevented it blowing out the cap. I would do that after every session and the car ran fine and did not overheat. BTW. I ditched the Evans and went to straight water with water wetter.

    I had enough of this so I did an experiment to see at what revs the pressure built up. I ran successive session on track at fixed RPMs starting at 3000 and cranked it up 500 RPM in each following session. No bubbles/ pressurization at revs under 5000 rpm. At 5500 RPM. The pressurization and bubbles in the system showed up.

    No loss of coolant. No gases in the tank. But after all the time, money on part replacements and huge denial. I finally pulled the head and replaced the head gasket. There was a small area that appeared to cause the issue. After reassembling, it runs great with no pressurization or bubbles in the system.

    May have no bearing on your issues but just felt the need to share. Best of luck. Tom.
    Mangia bene, Ridi spesso, Ama molto, Guidare veloce

    2000 Caterham Superlight #123
    1.8L VHPD Rover K Series
    2009 Caterham SV
    2.3L Cosworth Duratec

  4. #14
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    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
    2018 Caterham 420R with 2L Duratec 210hp at Donington UK
    1975 BMW CSL Group 4 (restoration finished - track set up time)
    1977 Holden Torana "A9X" (awaiting restoration)
    1985 Holden Commodore SS Group A (suspension restoration)
    1985 Holden Commodore Group A (suspension set up)
    1982 Ferrari 400i (radiator replacement)
    1965 Ford Mustang Fastback "Holman Moody"
    1992 Ford Escort RS Cosworth WRC (dyno time)
    1990 Range Rover 2 door Classic
    and another project car coming....

  5. #15
    Join Date
    May 2018
    Location
    Albany, NY
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    346

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    Quote Originally Posted by yellowss7 View Post
    Guys not to be a downer, but I chased bubbles at high revs pressurizing my coolant tank for a couple of years. Tried Evans coolant. Replaced water pump,radiator, installed one way valves and moved the headertank to the highest point. Tested for exhaust gases in the headertank. Negative I installed a higher pressure cap which worked a little better but I still got pressure build up at track revs.

    After each track session I would winch my car up the trailer ramp to put the tank as the highest point. Bubbles would bleed up into the tank and the level in the tank would go back down to normal. It did appear that the higher pressure cap prevented it blowing out the cap. I would do that after every session and the car ran fine and did not overheat. BTW. I ditched the Evans and went to straight water with water wetter.

    I had enough of this so I did an experiment to see at what revs the pressure built up. I ran successive session on track at fixed RPMs starting at 3000 and cranked it up 500 RPM in each following session. No bubbles/ pressurization at revs under 5000 rpm. At 5500 RPM. The pressurization and bubbles in the system showed up.

    No loss of coolant. No gases in the tank. But after all the time, money on part replacements and huge denial. I finally pulled the head and replaced the head gasket. There was a small area that appeared to cause the issue. After reassembling, it runs great with no pressurization or bubbles in the system.

    May have no bearing on your issues but just felt the need to share. Best of luck. Tom.
    Thank you Tom. That is very constructive.

    Luckily head gasket isn't too big of a job on a car like 7.

    I wouldn't rule it out in my case at all as I know my engine got very hot quite a few times during troubleshooting my fan circuit/wiring after buying the car and ironing out the kinks. Not out of realm of possibility to have gone bad.
    2001 Caterham Superlight R

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