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Forums: Public Access
Everything Else (Not Vincent Related)
Stuart Hooper 2014
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<blockquote data-quote="greg brillus" data-source="post: 50605" data-attributes="member: 597"><p>Motorcycle engines do not have to put up with massive changes in air temp, so thermal expansion is not critical. An air cooled aircraft engine has to put out maximum power on climb, thereby putting out a lot of heat. And on descent it goes to near freezing temps. The choke bores are to cope with this expansion on high power settings, allowing the cylinder walls to become closer to parallel, so as not to loose too much compression escaping past the rings. ( which on Continental engines are actually tapered top and bottom to help them seal better)......Sorry didn't mean to drift off topic........Aircraft engines are as equally interesting as Vincents.......<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" />...........Actually, the cylinders of a Vincent twin engine look remarkably like a pair on a large radial aero engine, methinks........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 50605, member: 597"] Motorcycle engines do not have to put up with massive changes in air temp, so thermal expansion is not critical. An air cooled aircraft engine has to put out maximum power on climb, thereby putting out a lot of heat. And on descent it goes to near freezing temps. The choke bores are to cope with this expansion on high power settings, allowing the cylinder walls to become closer to parallel, so as not to loose too much compression escaping past the rings. ( which on Continental engines are actually tapered top and bottom to help them seal better)......Sorry didn't mean to drift off topic........Aircraft engines are as equally interesting as Vincents.......;)...........Actually, the cylinders of a Vincent twin engine look remarkably like a pair on a large radial aero engine, methinks........Greg. [/QUOTE]
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Home
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Everything Else (Not Vincent Related)
Stuart Hooper 2014
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