Talk:Lycoming IO-720

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Aviation: Engines

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Why is it so big?

OK, so 100 kW is now routinely available from engines under two litres, why does it take an 11 litre engine to produce only 298 kW ? Is there a particular reason for it to be so inefficient ?

The Lycoming range (and similar aircraft engines) are designed to run at comparatively low revolutions (2,500 rpm) and at a low state of tune (compression ratio etc), it's done deliberately to reduce stress and wear on parts to make the engine more durable/reliable for aircraft use. A Formula I engine can squeeze 800 hp out of 2.4 Litres by running at 18,000 rpm but they don't last much longer than five races, doesn't matter if it blows up safety-wise as the driver is usually on the ground and doesn't need to look for a place to land!

It's a good point though and should be covered at aircraft engine if it isn't already. Cheers Nimbus (Cumulus nimbus floats by) 10:00, 16 June 2012 (UTC)[reply]

Also a car engine runs at low power most of the time. An aicraft engine must run at high power constantly, for hours on end. However let's keep in mind this is a 60's engine and is built exactly the same 50 years on. It has been a slow seller from the start and is still not popular. Aesma (talk) 09:52, 25 February 2017 (UTC)[reply]

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