Cooper S radiator – advice needed!

11 comments

  1. Hi everyone,

    I need to get a radiator for my S replica but am a bit confused as to the information given in various books and suppliers as to the best radiator to use:?.

    My car will have astandard 1275 S engine and will only be for show use. I want to retain the early square shaped header tank and have the small hex head 'self tapping' screws to hold the shrouds. It will have the standard 16 blade fan.

    Question is, what type of actual radiatorshould I use, 2, 3or 4 core ?

    Anyone got any views out there??!!

    Thanks

    Andrew

  2. imported post

    Hello Andrew, my 's' type was i think initially fitted with a three core radiator (standard not sure), standing in traffic or at the lights in London would soon see the temperature rise at a alarming rate.I then tried a mini spares st 4 core rad which was marginally better.Then mini spares produced a large capacity st 2 core rad which i now use.I have found it by far to be the better of the above,on a run engine temperature is at normal and standing takes longer to get hot.It is a standard engine with a plus 30 thu piston with oil cooler,i think a plus 60 thu pistonwill warm quicker. Driving with the heater on when it's a hot day is not fun!,but then you don't have to negotiate the mobile car park in London.All the above radshave round headers and not square.
    Hope this helps
    all the best
    John:)

  3. imported post

    Hello AL, I could not comment on a factory fitted high capacity water pump,but the one fitted to my car is a mini spares item with a large impeller (fitted 12 years ago),it did not require any modifications to the block.It is said in Parnell's book that mk2's are fitted with a revised pump which could mean a larger capacity? In what way did you modify the the block?
    all the best
    John

  4. imported post

    Hi John,

    The modification mentioned in the service manual involves taking just a little off an unmachined part of the casting, inside and at the bottom of the circular opening. Doing this prevents the vanesof the impeller fouling with block casting and is a case of extending themachining done at the factory for the regular impeller, well on my block anyway.

    Regards

    Al

  5. imported post

    Hello again Al, i assume your car is Australian built? would be nice to see a picture?
    if you would,john@middleton7592.freeserve.co.uk
    all the best
    John:)

  6. imported post

    Hi John,

    Sorry, my car is a plain old English one, like most NZ S's. We did get a few Australian ones butlater on in production.

    Regards

    Al

  7. imported post

    Hi John,

    Do you guys know anything about a factory high capacity water pump? My Australian service manual refers to it in later cars and suggest this type is retro-fitted to early S's. It does not mention what an 'early' or 'late' car is. Wouldn't it be great if there was a serial number or something. Anyway, I have fitted the later (and much deeper)impellor to my engine and removed a small amount of metal from the block as detailed in the manual.

    Regards

    Al

  8. imported post

    Hi Guys

    I believe the Cooper S was fitted as standard with a three core radiator (16 gills per inch?). This is denoted by an inverted C on the side. If the car is for shows and only a little use, this is probably what you should look for. Having said that, I too have experienced the special two core radiator, but not directly from Mini Spares, which was very good. It is possible of course to take the core and have it installed with the earlier top header tank and with the correct sides, which was whatI had done.

    If memory serves me right, I think the Cooper S was originally fitted with the smaller impeller water pump. I think this was changed a couple of years into production to a larger impellor.

    MK3 Meister will doubtless be able to confirm this.

    Tony.

  9. imported post

    Hi folks,

    Thanks for your comments on the radiator cores.

    Sounds like a 2 core rad might be the best to go for in the first place. I don't really want to try a 3 core and then have to change it later as we all know what a b****** job it is to change early radiators.

    I'll get in touch with the local radiator specialists to see if they can get a 2 core andfit it to my standard 850 radiator casing.

    All the best

    Andrew

  10. imported post

    Hi folks,

    Does anyone (in particular AMS) know where I can get just a 'super cool' 2 core radiator core (without the tanks)?

    My local radiator repair centre cannot get them and is not keen on unsoldering one and changing the tanks over due to potentially damaging the new core.

    Any help appreciated.

    Andrew

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