---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Wed 03/21/07: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:47 AM - Re: Lycoming Cylinder question (Jon A. Delamarter) 2. 06:51 AM - Re: New Lycoming Website (Jon A. Delamarter) 3. 07:13 AM - Re: Re: Lycoming Cylinder question (Kelly McMullen) 4. 07:51 AM - Re: Lycoming Cylinder question (Jon A. Delamarter) 5. 12:18 PM - Re: Re: Lycoming Cylinder question (Dan Rogers) 6. 01:30 PM - Re: Lycoming Cylinder question (Jon A. Delamarter) ________________________________ Message 1 _____________________________________ Time: 06:47:24 AM PST US Subject: Engines-List: Re: Lycoming Cylinder question From: "Jon A. Delamarter" Dan: Here's a brief overview I wrote for the new Lycoming website. Let me know if I can help with more details. Parallel Valve Cylinder The intake and exhaust valves of a parallel valve cylinder are mounted in parallel to one another in the cylinder head and share a common rocker shaft which is retained by the rocker cover. This arrangement gives the parallel valve cylinders rocker cover its distinctive parallel or square shape; parallel valve rocker covers are also distinguished from angle valve rocker covers by their greater thickness. Parallel valve cylinders are utilized on carbureted and some lower output, lightweight fuel injected engines. Most parallel valve 4 cylinder engines do not incorporate a counterweighted crankshaft which further contributes to their relative lightweight. Angle Valve Cylinder The intake and exhaust valves of an angle valve cylinder are mounted at angles to one another in the cylinder head. Angle valve cylinders utilize separate rocker shafts for intake and exhaust rockers; the rocker shafts are held in the cylinder head by separate retaining plates. This arrangement gives the angle valve cylinders rocker cover its distinctive angle shape; angle valve rocker covers are also distinguished from parallel valve rocker covers by their lesser thickness. Utilized on high output engines. Angle valve engines are heavier and slightly wider than their parallel valve counterparts but are capable of safely and efficiently producing more horsepower due to increased head density and improved head design. Angle valve engines incorporate counterweighted crankshafts which reduce torsional vibration. -------- Jon A. Delamarter Thunderbolt Manager Lycoming Engines Read this topic online here: http://forums.matronics.com/viewtopic.php?p=102066#102066 ________________________________ Message 2 _____________________________________ Time: 06:51:10 AM PST US Subject: Engines-List: Re: New Lycoming Website From: "Jon A. Delamarter" That is the intent. > [quote="Float Flyr"]About time!!!!! > > Thanks. I'll be watching! What I'd like to see is a control by wire piston > engine. One control for everything. > > Noel > > > > > > -- > -------- Jon A. Delamarter Thunderbolt Manager Lycoming Engines Read this topic online here: http://forums.matronics.com/viewtopic.php?p=102067#102067 ________________________________ Message 3 _____________________________________ Time: 07:13:38 AM PST US From: "Kelly McMullen" Subject: Re: Engines-List: Re: Lycoming Cylinder question That last sentence needs a bit of qualification. A large number of angle valve engines do NOT have counterweighted crankshafts. In particular, the IO-360-A1A, used extensively from 1964-1976. On 3/21/07, Jon A. Delamarter wrote: Angle valve engines incorporate counterweighted crankshafts which reduce torsional vibration. > ________________________________ Message 4 _____________________________________ Time: 07:51:28 AM PST US Subject: Engines-List: Re: Lycoming Cylinder question From: "Jon A. Delamarter" Touche'! You are absolutely correct. See what over-generalization gets me? I should have said "most" angle valve engines incorporate counter-weighted crankshafts. Hmm, I see I already have to edit my new website. Thanks for keeping me straight! > > apilot2(at)gmail.com wrote: > > That last sentence needs a bit of qualification. A large number of > > angle valve engines do NOT have counterweighted crankshafts. In > > particular, the IO-360-A1A, used extensively from 1964-1976. > > > > On 3/21/07, Jon A. Delamarter wrote: > > Angle valve engines incorporate counterweighted crankshafts which > > reduce torsional vibration. > > > > > > > > > > > > > > -------- Jon A. Delamarter Thunderbolt Manager Lycoming Engines Read this topic online here: http://forums.matronics.com/viewtopic.php?p=102079#102079 ________________________________ Message 5 _____________________________________ Time: 12:18:20 PM PST US From: Dan Rogers Subject: Re: Engines-List: Re: Lycoming Cylinder question Is this already on the Lycoming website?? If so I didn't find it when I went looking for this info! Dan R Jon A. Delamarter wrote: > > Dan: > > Here's a brief overview I wrote for the new Lycoming website. Let me know if I can help with more details. > > ________________________________ Message 6 _____________________________________ Time: 01:30:34 PM PST US Subject: Engines-List: Re: Lycoming Cylinder question From: "Jon A. Delamarter" Dan: Yes it is, but you're not going to see it unless you go through the engine configurator on the Thunderbolt microsite. www.lycoming.com/thunderbolt If you go through and configure a Thunderbolt engine, there is an option on the final page to view a printable version of the estimate. The bottom of the estimate has a ton of data. The info I posted is only a small portion. You always have the option of emailing me directly at jdelamarter@lycoming.textron.com. I don't have all the answers, but I work with the folks that have most of them! Kind regards, > [quote="drogers(at)maf.org"]Is this already on the Lycoming website?? If so I didn't find it when I > went looking for this info! -------- Jon A. Delamarter Thunderbolt Manager Lycoming Engines Read this topic online here: http://forums.matronics.com/viewtopic.php?p=102167#102167 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message engines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Engines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/engines-list Browse Digests http://www.matronics.com/digest/engines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.