Technisches Wörterbuch

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Terminologie dt. - engl.

Deutsch	Englisch	Begriffsbestimmung engl
* | Motor
OT	Top Dead Center (TDC)	The top of the piston's stroke
UT	Bottom Dead Center (BDC)	The bottom of the piston's stroke.
##	Deck	Top of Cylinder or Sleeve.
##	Deck Height	Top of cylinder down to top of piston "negative deck."
##	Positive Deck	If piston is above top of cylinder.
Quetschspalte	Squish Clearance	Verticle distance between top of piston and head. Measured at the edge of piston. See "Squish Test" for measuring with soft lead solder over wrist pin.
Nutzhub	Effective Stroke	The distance from TDC to where the piston starts to open the exhaust port. (Also called: Power Stroke) A longer effective stroke helps low-end power and helps maintain compression at high altitude.
##	Swept Volume	Volume of cylinder with piston at exhaust port opening to TDC. (4-stroke would be volume/cc's displaced by piston from BDC to TDC.)
##	Trapped Volume	Volume of combustion chamber with piston at TDC.
Verdichtungsverhältnis	Compression Ratio (CR)	Volume of cylinder and combustion chamber with piston at exhaust port opening, divided by, volume of combustion chamber with piston at TDC. This is the "corrected" compression ratio. Most accurate way is to "cc" with a syringe or burette. Note: Power valves will change CR until valve is wide open.
BMEP	BMEP	Brake Mean Effective Pressure.

Deutsch	Englisch	Begriffsbestimmung engl
* | Kanal Terminologie
Kanal	Port	Air passageway/duct that is cast and/or machined into the cylinder.
##	Port Window	The part of the port that opens into the cylinder bore.
##	Exhaust Port	The large port where the burnt gasses exit the cylinder.
Geteilter Auslass	Bridged Exhaust Port	Exhaust port with a center divider.
Nebenauslässe	Sub-Exhaust Ports	The small exhaust ports on each side of the main exhaust port. Measure at "choke point" not necessarily the port window.
Auslass mit 2 Nebenauslässen	Triple Exhaust Ports	One main exhaust port with one sub exhaust port on each side.
Überströmer	Transfer Ports/Ducts	The air passageways that allow the air/fuel mixture to transfer over the top of the piston to fill the cylinder.
Hauptüberströmer	Main/Front Transfers	The 2 transfer ports located closest to the exhaust port (5 port).
Nebenüberströmer	Secondary/Rear Transfers	The 2 rear transfer ports located closest to the boost port(s) (5 port).
Boostport	Boost Port(s)	The port or ports that are located opposite of the exhaust port and in-line with the intake port. These ports are usually angled sharply upwards to help scavenging.
Hilfsüberströmer	Auxiliary Transfers	Some cylinders have another set of transfers located between the front and rear sets (7 port).
##	Transfer Base	Where the air enters the ducts/passagways at the bottom of cylinder & top of crankcase.
Kurbelwinkel	Crank Angle	Crankshaft rotation measured in degrees. Total = 360 degrees.
Steuerwinkel	Port Timing	Degrees of crankshaft rotation after TDC to where port starts to open.
Steuerzeit	Duration	The number of degrees of crankshaft rotation that a port is open.
Zeitquerschnitt	TA = Time-Area = TimeArea	The time and area required for a phase of the 2-stroke cycle at a specific RPM and BMEP. Examples: Transfer Port TA, Exhaust Port TA, Blowdown TA, and Intake Port TA.
##	Port-TimeArea	The amount of time and area required for a port to flow the necessary air at a specific rpm and BMEP. The higher an engine rpm and/or pressure (BMEP) the more TimeArea required.
Sehnenmass	Chordal Width	= 90 degrees to Gas Flow or shortest straightline distance between sides.
Vorauslass	BlowDown	Measured in degrees of crankshaft rotation from Exhaust Port opening to the Transfer Ports opening.
##	BlowDown TA	Must allow the cylinder pressure to drop below the pressure of the fuel air mixture at time of transfer ports opening. If the Blowdown pressure is to high when transfer ports open, it will stall or reverse, the incoming charge of fuel and air.
##	LowBlow Width	Width of exhaust port when transfer ports open. Used to calculate BlowDown TimeArea.
##	Port Height above BDC	With piston at BDC, measure from bottom of port, or piston, depending on which is higher, to top of port roof.
ÜS-Dachwinkel?	Port Roof Angle	The angle of the top of the port at the window. Flat ='s 0 degrees.
Spülung	Scavenging	The process of pushing the burnt gas out of the cylinder and combustion chamber with a fresh fuel air charge. The transfer ports shape and direction of flow determines how the fresh charge will fill the cylinder and combustion chamber without short circuiting out the exhaust port. A good pipe will help the scavenging process.

Deutsch	Englisch	Begriffsbestimmung engl
* | Kopf Terminologie
##	MSV Maximum Squish Velocity	rates the maximum velocity of the fuel air traveling across the squishband just before the piston reaches TDC. If MSV is to low the flame front will not burn the fuel air mixture effectively. If MSV is to high, detonation will occur and cause engine damage. The TSR programs calculate MSV for various types of heads.
Dachfoermige Kopfform	Tub Head	Shape of the combustion chamber - like a tub or hat.
Halbkugelförmige Kopfform	Hemi Head	Hemispherical shape for the combustion chamber.
Quetschfläche	Squish Band	Outer area of head that forces the unburned fuel air mix into the center chamber for combustion. The squish band angle is usually 1-2 degrees greater than the angle of the piston dome. Verticle clearance and squishband width affect MSV.
Quetschspalte	Squish	Verticle distance between top of piston and head. By measuring the step in the head and subtracting this number from the squish clearance you will have the distance the piston is below deck (negative deck). The negative deck measurement is needed to calculate port timing.
Quetschspaltenverhältnis	Squish Band Area	Varies from 30% - 60% of Bore area.

TBC

--MiNiKiN 12:37, 13. Nov. 2009 (UTC) engl. Woerterbuch korrigiert und ergaenzt, Motorterminologie engl. hinzugefuegt