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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
GP advice & suggestions
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<blockquote data-quote="davidd" data-source="post: 115072" data-attributes="member: 1177"><p>Its interesting that the Amal 510 delivers more fuel than any other Amal float bowl. Maurice Candy commented on this as his 500 Manx used one also. His engine produced 64 BHP. The Flash at 40 BHP got 37 MPG at Daytona, so fuel flow did not seem to be of great concern. I did check the maximum flow, which was about 3/4 of a gallon in a minute. I raced at Daytona several times and there was no cheating because my fuel tank was a little more than a gallon, which would do 10 laps while our race was 5 laps with a warm up lap.</p><p></p><p>Measuring the flow of fuel is critical. Measure the first time 1 gallon flowing out the petcock with the gas cap removed. Then measure flow with the fuel cap on. This will tell you if you have a vent slowing the fuel flow. Then do the test through the float with the cap on. If you get 8 ounces or more per minute it should be OK. If you are at the low end you should be checking to see what the obstacle is. I used a large 3/8" tap called "the Guzzler" made by Pingel. It also had a lever/cable operated remote "off" mechanism, which could be operated from the handlebar. This is required by some racing orgs. It is quite expensive, but it works very well for all different fuels.</p><p></p><p>[URL unfurl="true"]http://www.pingelonline.com/guzzler-fuel-valve/gva-the-guzzler-fuel-valve-anodized-finish.asp[/URL]</p><p></p><p>You may be missing fuel because it is squirting out the vent hole of the float. I noticed this on the dyno. On overrun the fuel would squirt out the vent the entire time the throttle was closed due to a frequency vibration that was not noticeable to the rider. Depending on which way the vent hole points, you will not be able to notice this. The fuel shoots out and evaporates prior to discovery. Tightening the float mount a bit cured the problem.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 115072, member: 1177"] Its interesting that the Amal 510 delivers more fuel than any other Amal float bowl. Maurice Candy commented on this as his 500 Manx used one also. His engine produced 64 BHP. The Flash at 40 BHP got 37 MPG at Daytona, so fuel flow did not seem to be of great concern. I did check the maximum flow, which was about 3/4 of a gallon in a minute. I raced at Daytona several times and there was no cheating because my fuel tank was a little more than a gallon, which would do 10 laps while our race was 5 laps with a warm up lap. Measuring the flow of fuel is critical. Measure the first time 1 gallon flowing out the petcock with the gas cap removed. Then measure flow with the fuel cap on. This will tell you if you have a vent slowing the fuel flow. Then do the test through the float with the cap on. If you get 8 ounces or more per minute it should be OK. If you are at the low end you should be checking to see what the obstacle is. I used a large 3/8" tap called "the Guzzler" made by Pingel. It also had a lever/cable operated remote "off" mechanism, which could be operated from the handlebar. This is required by some racing orgs. It is quite expensive, but it works very well for all different fuels. [URL unfurl="true"]http://www.pingelonline.com/guzzler-fuel-valve/gva-the-guzzler-fuel-valve-anodized-finish.asp[/URL] You may be missing fuel because it is squirting out the vent hole of the float. I noticed this on the dyno. On overrun the fuel would squirt out the vent the entire time the throttle was closed due to a frequency vibration that was not noticeable to the rider. Depending on which way the vent hole points, you will not be able to notice this. The fuel shoots out and evaporates prior to discovery. Tightening the float mount a bit cured the problem. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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