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#1
March 16th 05, 10:30 PM
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"MikeR" wrote in message ... No wheel in this one (electrical impulses). Impulses from what? 
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#2
March 16th 05, 11:45 PM
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"Blueskies" wrote in message . com... "MikeR" wrote in message ... No wheel in this one (electrical impulses). Impulses from what? Ref: http://203.167.230.122/qiss/scripts/FAQFrame.htm Title: How does the flow transducer work? Question/Symptom: How does the flow transducer work? -------------------------------------------------------------------------- Answer/Solution: NAVMAN flow transducers are of an optical type. Within the transducer are a transmitter and receiver that output an infrared beam through the body of the transducer. Inside the transducer is a very precisely dimensioned turbine running on jewelled bearings. As the fuel flows it spins the turbine and the blades cut the infrared beam, which transmits a pulsed signal to the fuel computer.
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#3
March 17th 05, 01:13 AM
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"MikeR" wrote in message ... "Blueskies" wrote in message . com... "MikeR" wrote in message ... No wheel in this one (electrical impulses). Impulses from what? Ref: http://203.167.230.122/qiss/scripts/FAQFrame.htm Title: How does the flow transducer work? Question/Symptom: How does the flow transducer work? -------------------------------------------------------------------------- Answer/Solution: NAVMAN flow transducers are of an optical type. Within the transducer are a transmitter and receiver that output an infrared beam through the body of the transducer. Inside the transducer is a very precisely dimensioned turbine running on jewelled bearings. As the fuel flows it spins the turbine and the blades cut the infrared beam, which transmits a pulsed signal to the fuel computer. OK, normal stuff. Thanks for the link. The concern from the other folks is what happens to pressure drop if the (turbine in this case) wheel seizes up. Usually it will add some pressure drop with a corresponding restriction to the flow, but the turbine types pass fluid pretty well even if seized...
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#4
March 17th 05, 02:13 AM
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"Blueskies" wrote in message om... "MikeR" wrote in message ... "Blueskies" wrote in message . com... "MikeR" wrote in message ... No wheel in this one (electrical impulses). Impulses from what? Ref: http://203.167.230.122/qiss/scripts/FAQFrame.htm Title: How does the flow transducer work? Question/Symptom: How does the flow transducer work? -------------------------------------------------------------------------- Answer/Solution: NAVMAN flow transducers are of an optical type. Within the transducer are a transmitter and receiver that output an infrared beam through the body of the transducer. Inside the transducer is a very precisely dimensioned turbine running on jewelled bearings. As the fuel flows it spins the turbine and the blades cut the infrared beam, which transmits a pulsed signal to the fuel computer. OK, normal stuff. Thanks for the link. The concern from the other folks is what happens to pressure drop if the (turbine in this case) wheel seizes up. Usually it will add some pressure drop with a corresponding restriction to the flow, but the turbine types pass fluid pretty well even if seized... They try to address that issue he http://203.167.230.122/qiss/scripts/FAQFrame.htm Title: Will the fuel transducer restrict fuel flow? Question/Symptom: Will the fuel flow transducer obstruct the fuel supply to my engine? -------------------------------------------------------------------------- Answer/Solution: The current one-piece flow transducer is rated at a maximum flow rate of 130 litres per hour (32 US gallons per hour). In modern terms this is a relatively large amount of fuel especially with the advent of far more economical engines. In cases where users suspect the flow transducer of being the cause of a fuel supply problem then it is generally found that the design of the fuel delivery system is marginal to start with, in other words adding the flow transducer may be the straw that breaks the camels back but it is not the cause of the problem. The critical measurement in any outboard engine fuel system is the total backpressure at full throttle. This is measured in 'Inches of Mercury'. The absolute maximum acceptable limit amongst most manufacturers is 7.0 inches of mercury and ideally should be far less (Always consult your outboard manufacturer for detailed recommendations). Our fuel transducer creates a maximum backpressure of 1.0 inch of mercury backpressure so even if your manufacturer specified a maximum of 4.0 inches backpressure then you have plenty of margin for the fuel delivery system components
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#5
March 18th 05, 01:53 AM
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"MikeR" wrote in message ... Our fuel transducer creates a maximum backpressure of 1.0 inch of mercury backpressure so even if your manufacturer specified a maximum of 4.0 inches backpressure then you have plenty of margin for the fuel delivery system components That is low, and a 32 GPM rated? No issues that I can see... Thanks Mike!
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