Low temp thermostat-Mercury Marine

[David A. Cooley]

What I don't understand is if they don't want the engines to build up 
scale, so they run them at temps that require frequent rebuilds, why don't 
they use a closed loop cooling system, glycol and all, and instead of a 
radiator, use a water to water heat exchanger? (radiator in a tank of 
outside circulating water) then run a 190 thermostat or so for longevity??


At 10:37 PM 10/28/99 +0200, you wrote:

>Hi all!
>I read an article about Mercury wanted to to take a big leap into high tec,
>in the 80s I think . They put in a huge amount of money and started to
>develop the ultimate offshore engine , twin turbo.....the trick about it
>was
>that they used separate cooling for block and head. They used o rings
>for top head gaskets. The head could run at a lower temp than block to
>lower knock tendencies.
>The offshore engines was good but no succsess in the offshore races because
>of "drive train problems".
>
>Engine temp is just one of the variables to play with ...how is it possible
>to find the right relationship between  compression ratio, swirl, ignition
>advance,
>fuel amount ,air inlet temp, coolant temp.
>Maybe the best is hot engine at low output , cold at max torque, and hot
>again at high rpm.......
>Variable heat is like variable compression?
>Maybe a engine that likes to run wery hot would be better off with higher
>compression?
>Thinking loud again......
>Espen Hilde

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            David Cooley N5XMT           Internet: N5XMT at bellsouth.net
      Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
    Sponges grow in the ocean... Wonder how deep it would be if they didn't?!
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