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Some visual of air cooled engines fuel cooling at rich

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Some visual of air cooled engines fuel cooling at rich

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Old 17th Apr 2018, 20:13
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Originally Posted by rutan around
I would bet those valves are burnt by running too lean but on the rich side side of peak EGT. ie about 25 degrees ROP where the peak pressure is greatest. If your customers must run ROP insist they run far enough ROP to not damage their aircraft.
Funny these days we dont see much of it other than aircraft fitted with lean assist i dont understand why that would be strange hey.
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Old 18th Apr 2018, 01:15
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Interesting point made.
Through the efforts of organizations like the Royal Aircraft Factory/Establishment and the valve manufacturers, better materials were adopted, but these were simple modifications of alloys which were in use. It was only after the Second World War that materials were specifically developed for exhaust valves. Even this was probably more a result of the shortage of nickel. The other materials just happened to be in the right place at the right time, the classic example being Nichrome, originally developed for electric toasters. Even today, the factors which cause valves and seats to fail are still not properly understood at a fundamental level.
https://www.tandfonline.com/doi/full...30?src=recsys&
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Old 18th Apr 2018, 01:28
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Some visual of air cooled engines fuel cooling at rich
More cooling fuel on the Merlin
Air cooled Merlin?


If only the Allies had known and removed all those unnecessary radiators and all that plumbing....
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Old 19th Apr 2018, 10:05
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Originally Posted by 4forward8back
Air cooled Merlin?


If only the Allies had known and removed all those unnecessary radiators and all that plumbing....


Yes cooling fuel, even on water cooled engines - It is fuel cooling, a substance to transfer heat.


How much water cooling is on the piston?
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