Kinsler_Handbook_#32 December 2017

207 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. Phone (248) 362-1145 Fax (248) 362-1032 Kinsler Fuel Injection, Inc, LUCAS NOZZLE PLACEMENT Note - when the nozzles are located high in the ramtube, that the nozzle must be installed at a 45 o downward angle. This will keep the fuel spray going horizontally across the port and downward. Advantage of low nozzle position is very good throttle response, which is very important on short tight tracks; not so important on long wide open tracks. This relative nozzle position shown here is gener- ally a good compromise between good power and good throttle response. This angle is necessary to keep from having excessive standoff .... the pulsating air column in the ramtube moves upward and carries fuel with it. The pulsation moves up and down as much as four inches in the well tuned (ramtuned) racing engine. If the nozzle is located low enough where standoff is no problem, it should point straight into the runner, as this will achieve the most efficient spray pattern. Advantage of high nozzle location, there is more time for the fuel to evaporate before it goes past the inlet valve, thus the charge is cooler and therefore more dense. This gives more power. A disadvantage of this position is that it takes the fuel longer to get to the inlet valve during changes of fuel rate requirement; thus poorer throttle response. © 2017