This is *precisely* how I managed to swallow the # 3 cylinder exhaust valve on my 36hp engine ~
I'd been thrashing the car as fast as it'd go in the early morning on Rt. 126 and realized I shouldn't be , had a brain fart and instead of easing off the thottle , I let up completely and the car slowed back down to 55 MPH , I re applied the throttle again and within a matter of seconds , the valve's head snapped off...
Oops ~ youthful exuberance once again breaks a perfectly good machine.
(that and basic stupidity)
The *good* thing is : I rebuilt this engine and still have it in my 1960 VW # 117 DeLuxe Sliding Sunshine Roof Beetle .
As far as engine exhaust heating , the heat comes up *MUCH* faster when cold starting and routine maintenance and inspection will prevent leaks...
-Nate
Dave wrote:
>
> Here's my take on air cooled engines from my few years of flying small planes (air cooled engines) after I got my pilot's license. The advantage of air cooled engines is, yes, their simplicity which is important as far as weight and reliability are concerned - no coolant to carry around and leak out and no pumps to fail. The downside is shock cooling and cabin heat. When you pull the throttle to descend, the engine starts putting out much less heat while the air still flows through the cooling fins. The result is rapid shock cooling of the engine which results in stresses and increased wear. The other disadvantage is cabin heat. Putting aside the uncomfortable fact that the heat output is variable with the engine output, there is the danger of carbon monoxide poisoning given that there is only a thin wall of steel between the cabin air and the exhaust. Unfortunately, numerous crashes can be traced to the soporific effects of CO.
>
> For cars, liquid cooling offers much better heating, consistent engine temperatures resulting in (theoretically) longer engine life, and quiter running as the water jacket deadens some of the sound.
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> -Dave W
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>
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