Both the needle and seat area
2019年3月14日 友達In oval track applications, a Belt Drive or Hex Drive Fuel Pump is
preferred where use of a mechanical fuel pump is specified. These pumps offer
the highest fuel delivery volume of any mechanical pump yet maintains low fuel
pressure at low engine speeds. This feature alleviates "loading up"
of the spark plugs. The BG Six-valve and Super Speedway mechanical fuel pumps
will also deliver ample fuel volume when used according to recommendations.
For drag race cars, a BG400-2 Electric Fuel
Pump is the best way to guard against fuel starvation. If a car is lazy or
lays down at mid-track then pulls well in a higher gear, the engine may be
experiencing intermittent fuel starvation.
Why? Typically, the carburetor bowls are
full at the starting line so the car leaves hard but in the process, drains the
bowls dry. In the lower gears, the car accelerates rapidly with the engine
picking up rpm very quickly. This rapid acceleration increases the demand for
fuel. When the float bowl fuel level drops, the car lays down because of fuel
starvation. In high gear, engine speed increases more slowly allowing the bowls
to fill again.
The Fuel Can Testhere’s been no shortage of well-researched and
well-written articles and books explaining the workings of the fuel system.
However, many racers, both novice and experienced alike do not fully understandthe physics of fuel flow and horsepower. To produce torque and horsepo
requires a mixture of air and fuel. To produce 1-horsepower for 1-hour requires
approximately .5-lbs of gasoline. If you ran a single-cylinder engine, like theone in your lawnmower, under a load of 1-horsepower for 1-hour and weighed thefuel tank before and after, the tank would weigh approximately .5-lb(five-tenths of a pound) lighter. Therefore the equation for fuel flow is
This is expressed on a dyno sheet as B.S.F.C.
(Brake Specific Fuel Consumption). Highly-tuned racing engines can sometimes be
more efficient, yielding B.S.F.C. figures of around smart socket Factory.40 which means 4-tenths
of a lb. of fuel, per h.p., per hour. Incidentally, the formula for Alcohol is
approximately 1-lb of fuel, per h.p. per hour which, as a consequence,
necessitates the running of a belt-drive pump, but that’s another story.
Typically, a 600-HP engine will require 300-lbs of
gasoline per hour and, by the same formula, an 800-HP engine needs 400-lbs perhour. Remember, these quantities of fuel have to be delivered past the needles
and seats and the fuel pressure regulator. Consider also, the fuel delivery # system has to combat ’G’ Forces: loadings that are so formidable they can threaten
to stall the fuel in the line (this may also give a clue as to why a fuel line
that is too large in diameter can be as harmful as one that is too small). This
leads us to the area that is least understood.
When you have only one carburetor it should
be easier to feed than two, right? Wrong, in an engine with a tunnel-ram
layout, both the needle and seat area and the float bowl capacity have doubled!
Whereas the single four-barrel car that is most prevalent today, has a m
harder task in keeping the fuel bowls full! A 700-HP tunnel-ram engine needs350-lbs of fuel per hour which equates to a little over 85-lbs per float bowl.https://www.timercn.com/product/remote-control-socket/
preferred where use of a mechanical fuel pump is specified. These pumps offer
the highest fuel delivery volume of any mechanical pump yet maintains low fuel
pressure at low engine speeds. This feature alleviates "loading up"
of the spark plugs. The BG Six-valve and Super Speedway mechanical fuel pumps
will also deliver ample fuel volume when used according to recommendations.
For drag race cars, a BG400-2 Electric Fuel
Pump is the best way to guard against fuel starvation. If a car is lazy or
lays down at mid-track then pulls well in a higher gear, the engine may be
experiencing intermittent fuel starvation.
Why? Typically, the carburetor bowls are
full at the starting line so the car leaves hard but in the process, drains the
bowls dry. In the lower gears, the car accelerates rapidly with the engine
picking up rpm very quickly. This rapid acceleration increases the demand for
fuel. When the float bowl fuel level drops, the car lays down because of fuel
starvation. In high gear, engine speed increases more slowly allowing the bowls
to fill again.
The Fuel Can Testhere’s been no shortage of well-researched and
well-written articles and books explaining the workings of the fuel system.
However, many racers, both novice and experienced alike do not fully understandthe physics of fuel flow and horsepower. To produce torque and horsepo
requires a mixture of air and fuel. To produce 1-horsepower for 1-hour requires
approximately .5-lbs of gasoline. If you ran a single-cylinder engine, like theone in your lawnmower, under a load of 1-horsepower for 1-hour and weighed thefuel tank before and after, the tank would weigh approximately .5-lb(five-tenths of a pound) lighter. Therefore the equation for fuel flow is
This is expressed on a dyno sheet as B.S.F.C.
(Brake Specific Fuel Consumption). Highly-tuned racing engines can sometimes be
more efficient, yielding B.S.F.C. figures of around smart socket Factory.40 which means 4-tenths
of a lb. of fuel, per h.p., per hour. Incidentally, the formula for Alcohol is
approximately 1-lb of fuel, per h.p. per hour which, as a consequence,
necessitates the running of a belt-drive pump, but that’s another story.
Typically, a 600-HP engine will require 300-lbs of
gasoline per hour and, by the same formula, an 800-HP engine needs 400-lbs perhour. Remember, these quantities of fuel have to be delivered past the needles
and seats and the fuel pressure regulator. Consider also, the fuel delivery # system has to combat ’G’ Forces: loadings that are so formidable they can threaten
to stall the fuel in the line (this may also give a clue as to why a fuel line
that is too large in diameter can be as harmful as one that is too small). This
leads us to the area that is least understood.
When you have only one carburetor it should
be easier to feed than two, right? Wrong, in an engine with a tunnel-ram
layout, both the needle and seat area and the float bowl capacity have doubled!
Whereas the single four-barrel car that is most prevalent today, has a m
harder task in keeping the fuel bowls full! A 700-HP tunnel-ram engine needs350-lbs of fuel per hour which equates to a little over 85-lbs per float bowl.https://www.timercn.com/product/remote-control-socket/
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