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Thread: radiators

Discuss the Austin Healey Sprite and the MG Midget. Two different but similar cars sometimes referred to collectively as the Spridget.

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    radiators

    After replacing my 1098 with a 1275 I find the car running hotter. I still am using the old radiator, which has been professionally cleaned etc.
    Have others found it necessary to update radiators when making this chanege and if so, have you used the newer cross flow radiator or another type?

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    Yoda Trevor Jessie's Avatar
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    Re: radiators

    How much hotter? Are you measuring the temperature in the head or the radiator? What about before?

    I'm using a downflow with my 1275 supercharged engine and it is doing OK, but I'm considering making new radiator mounts and mounting a larger radiator.
    _____________________
    1970/2 MG Midget
    Datsun 5-speed
    Future Fuel Injection Turbo Project
    _________________
    1958/9 Sprite AN5L/1499
    1275 SuperCharged
    Datsun 5-speed
    _________________

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    Re: radiators

    A 1275 is 16% larger +++>>> MORE HEAT

    You might need a upgraded radiator to compensate?

    Steve
    Driving 1 of 5 Pure (white) GXP Solstice Coupes. 2.0t 5M GMPP

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    Yoda Trevor Jessie's Avatar
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    Re: radiators

    My down flow is a 3 row core. It does cool better than when the engine was in the midget with the cross flow (and that was a new radiator).

    I think if you look at the construction and area of the stock cross flow and the stock down flow you'll find they have very similar cooling capabilities.
    _____________________
    1970/2 MG Midget
    Datsun 5-speed
    Future Fuel Injection Turbo Project
    _________________
    1958/9 Sprite AN5L/1499
    1275 SuperCharged
    Datsun 5-speed
    _________________

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    Yoda Trevor Jessie's Avatar
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    Re: radiators

    Oh... and some 1275 cars came with downflow IIRC.
    _____________________
    1970/2 MG Midget
    Datsun 5-speed
    Future Fuel Injection Turbo Project
    _________________
    1958/9 Sprite AN5L/1499
    1275 SuperCharged
    Datsun 5-speed
    _________________

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    Re: radiators

    A thermodynamics engineer on the Sprite List did the numbers on downflow vs cross flow.
    In the end, there was no difference in cooling capacities but the cross flow was a weaker designed radiator. So he says.
    I run downflows in all my Sprites except 1, it has a Geo Metro radiator in it.
    All Sprites have 1275s in them.
    1967 had the most powerful 1275 (from the factory) and it used a downflow.
    The cross flow was a closed circuit set up to meet federal specs in 1968.
    No more coolant overflowing on the street.

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    Re: radiators

    On my microcar forum, there was a similar conversation, after all the theories about various rads (not spridgets) turned out to be a different fluid mixture causing a different temperature.
    John-Peter Smit
    1976 MG Midget
    1969 Vauxhall Viva GT
    1958 Fiat Multipla (Barn art)

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    Re: radiators

    Waiting for one of you to try the cheap chinese aluminum rads that have been on ebay. Someone?? So I don't have to!!

    Kurt.
    65,66 Midget
    57 Berkeley, MGA
    Working on quality rather than quantity

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    Re: radiators

    That was exactly what I was wondering !

    Would a cheap ebay Chinese radiator solve the problem.

    Actually the car doesn't run too hot but it will creep up to 200 at a stop light in the summer time, which I would rather it didn't.

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    Yoda Trevor Jessie's Avatar
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    Re: radiators

    Is the belt properly tensioned? Washed the bugs out of the coils? Maybe a little more water and a little less antifreeze?
    _____________________
    1970/2 MG Midget
    Datsun 5-speed
    Future Fuel Injection Turbo Project
    _________________
    1958/9 Sprite AN5L/1499
    1275 SuperCharged
    Datsun 5-speed
    _________________

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    Jedi Warrior Jer's Avatar
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    Re: radiators

    I also noticed a difference once I added red line water wetter to my system.
    Jer
    President, Sprite Midget Club USA - Algoma Chapter, Ontario, Canada
    Used to own a 1967 MG Midget & 1974 MG Midget (Driver's)
    Had a Bugeye Sprite Project & TR3 Projects that got sold off before I got serious..

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