. Canadian machinery and metalworking (January-June 1919). ntages of rotary overstationary engines, thechief advantage of thejtormer is that itswei°:M per horse-power is much less. Itis easier to dismantle arotary engine and it \~=more accessible. Thedisadvantages of therotary engine are thatit is a very heavy con-sumer of fuel and notas reliable as the sta-tionary that all engines work on acommon basis, that is, the four-stroke orOtto cycle principle, one method of tim-ing may be applied to every engine: 1. Set any piston in exhaust closingposition. 2. Set exhaust tappet
. Canadian machinery and metalworking (January-June 1919). ntages of rotary overstationary engines, thechief advantage of thejtormer is that itswei°:M per horse-power is much less. Itis easier to dismantle arotary engine and it \~=more accessible. Thedisadvantages of therotary engine are thatit is a very heavy con-sumer of fuel and notas reliable as the sta-tionary that all engines work on acommon basis, that is, the four-stroke orOtto cycle principle, one method of tim-ing may be applied to every engine: 1. Set any piston in exhaust closingposition. 2. Set exhaust tappet clearance forthat cylinder. 3. Turn the camshaft in the directionof its rotation until the particular ex-haust valve for the cylinder being timedis in the closed position. 4. Mesh the timing gears. 5. Adjust the remaining tappet clear-ances. Similarly the ignition timing of anyengine: 1. Set any piston in ignition position. 2. Mesh the magneto driving gearwith the platinum points of the contactbreaker just breaking. 3. Wire the distributor terminals to. Scoop y, ftnwB Wirier gram which enables us to obtain the In-dicated horse power () of the en-gine. Special optical diaphragm indi-cators are occasionally employed, how-ever, and with reasonable care fairly ac-curate diagrams can be obtained. It is,however, an instrument more suitable Wi-the laboratory than for an engineeringworkshop test room. It is necessarjywhen taking these diagrams to obtainrecords of several successive cycles asthey vary in shape and size so that anaverage may be taken in determining themean effective pressure. Once havingobtained an indicator diagram it is aneasy matter to work out the indicatedhorse power of an engine. From an in-spection of the accompanying diagrahiit will be seen that it is a simple matterto obtain the mean height of the dia-gram, which, of course, will be our meaneffective pressure. Knowing this we canproceed with the following formula andwork out the The work done per
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmachinery, bookyear19
