Diagrammet över inverkan vid olika trottellägen är fel!
Jag tycker det är lite väl mycket gissningar och rena felaktigheter i denna tråden !
Den bifogade filen är rätt diagram för våra gasare.
Bränsleskruven påverkar tillsammans med Pilot Jet från noll trottelöppning upp till halvgas.
Läs nedanstående text för komplett beskrivning av systemet i IQ RR (Och andra 600HO med förgasare) :
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Fuel Delivery
The pilot system's main function is to meter fuel at idle and low speed driving. Though its
main function is to supply fuel at low speed, it does feed fuel continuously throughout the
entire operating range. Fuel for the pilot jet is drawn from the float bowl, mixed with air jet,
and delivered to the engine through the pilot outlet. The mixture is regulated to some degree by adjusting the fuel screw.
The main system is designed to deliver fuel between low speed and high speed operation. This system is made up of the jet needle, needle jet, and main jet. The main system begins to take effect as soon as there is enough air flow into the carburetor venturi to draw fuel up through the main jet and needle jet assembly. This system works in conjunction with the needle jet system.
During low speed driving, there is very little clearance between the jet needle and the needle jet; therefore, very little fuel from the main jet can pass between the jet needle and the needle jet. As the throttle valve opening is increased, the tapered jet needle is raised farther out of the needle jet, allowing greater fuel flow. Under full throttle opening, the cross sectioned area of clearance between the jet needle and the needle jet becomes greater than
the cross sectioned area of the main jet. Thus the main jet is now controlling the amount of fuel flow.
Pilot Jet
From idling to low speeds, the fuel supply is metered by the pilot jet. There are several air bleed openings in the sides of the pilot jet which reduce the fuel to mist. The number stamped on the jet is an indication of the amount of fuel in cc's which passes
through the jet during a one minute interval under a given set of conditions.
Fuel Screw
The fuel screw controls the fuel mixture from idle to low speeds. The tapered tip of the fuel screw projects into the passage leading to the by pass out let. By turning the screw in or out, the cross sectional area of the air passage is varied, in turn varying the fuel screw varies the amount of air/fuel.
Main Jet
When the throttle opening becomes greater and the area between the needle jet and jet needle increases, fuel flow is metered by the main jet. The number on the jet indicates the amount of fuel which will pass through it in one minute under controlled conditions. Larger numbers give a greater flow, resulting in a richer mixture. Main jets are
screwed directly into the needle jet base
Dock vill man slippa bludder....
