reaching proper operating temperature

[Howard 111]

I run the Brazilian shroud, no flaps, no thermostat. It's a VW of Brazil design. The German shrouds were designed by VW of Germany where it gets very cold during the Winter.

I think the whole flaps design is more for providing heat for the passengers than cooling the engine. To make the engine to rise to a temp that warms the engine and passengers, but then focuses on cooling the engine, was such a brilliant design.
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1973 Karmann Ghia
Turbocharged, Fuel Injected
http://www.thesamba.com/vw/forum/viewtopic.php?t=531270

[Danwvw]

No that's not right at all. It's like any engine Air cooled or Water cooled. They became more efficient when up to operating temp. With a lot of cold air blowing thru the head fins they will just run cold and not overcome that cold head temp unless they are putting out full power. They even can cool down too much after being warm just by coming off the highway when it's 50' or less Degrees F. out.

If your driving the car in town they really need the flaps so they warm up quickly. 2 minutes and the Intake manifold begins to worm significantly. Without the flaps the intake air stays cold much longer. 2 minutes, well assuming you've hooked up warm air to the carb. My dual carb engine could actually use warm air. Wish it had it. Need a way to do that.
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[mcmscott]

[mcmscott]

[Danwvw]

[mcmscott]

[Danwvw]

Actually if you think about it the 36 horse and the 40 horse and the 356's used big flaps to warm the car and when they were closed it forced recirculated air to warm the engine.
The VW engines that came later only used exhaust pipe heat to warm the car.

I really like the way the early vw air-cooled engines used that intake ring to control temperature. I can't remember if the fan shroud had some kind of directional louvers on them or not.

Found a Photo here:

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[mark tucker]

I agree with scott&howard 3rd. but there will always be a lot of flap about the flaps. kinda like a snow mobile with ice spikes in Jamaica.just remove all the unneeded parts and you have a .......jetski.