Emmanueld
Have made time and found the article, reference a solutionto curing overheating problem on AC 428s Cobras even Cobra Daytonas'.
Pages 9 , 10 & 11 in ACtion Vol 8 No6 ( October 1984 ) written by Wolfgang Rudolf. I will attempt to get it reproduced on the Form.
Most Sports / Exotic cars with plenty of grunt have either or / And, not only adaquate cold air intake but also have features eg Louvres or shaped body panels to allow hot air to be drawn out and away from the heat source.
Unfortuneatly ACs restricted the frontage of the car, put inadaquate side vents which incidentaly they then obstructed with other items, The heat builds up and has no where to go.
Fitting bigger rad would help a little, extra electric fans can move the air, but does not extract and take the stale stagnent air away from under the hood ( BonnetExtract from ACtion feature.
Test drives on the Nurburgring Grand Prix Circuit with an air scoop and opened bonnet (Hood) showed no overheating tendencieseven under extreme driving conditions. With the bonnet (hood) closed overheating showed itself within a few minutes, which clearly showed that air inlet and outlet are entirely disproportionate.
Carrol Shelby, Bob Bondurant etc all experienced similar / same problems with the Daytona Cobra/s.You MUST get rid of the engine heat with a continuos adaquate flow of cold air, 20% to30% of engine heat is taken away by coolant (water), 30% or more needs to be removed by air flow around the engine.
Some of the Cobras and Aces racing in the UK, especially endurance 1 -1/2 hours or more run with the rear edge of the bonnet locked open by using extended securing pins.( 1" t0 !.5") Doesnt look too pretty but does the job, however two rows of 15 louvres looks purposfull, looks cool and allows the engine to run cooler, the occupants can enjoy the drive and arrive at there destination reasonably dry and comfortable.
Check out 1960s.... Aston Martins, Jensons, Iso Grifo, Bizzarrini, Ferrari 250s etc etc, all have adaquate heat extraction built into the contours of the body, these features are expected and serve a purpose, pity AC didnt spend a little more time in the wind tunnel or design stage to overcome this persistant problem. Carry out the test and you will enjoy the 428 like never B4.
Enjoy ! !
Keith
Keith