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techtalk:ref:engmech07n [2020/10/02 16:38] hippysmack created |
techtalk:ref:engmech07n [2023/12/26 22:41] (current) hippysmack |
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| ====== REF: Engine Mechanicals - Sub-07N ====== | ====== REF: Engine Mechanicals - Sub-07N ====== | ||
| ====== Dyno testing using the timing plug location for an additional crankcase vent by aswracing ====== | ====== Dyno testing using the timing plug location for an additional crankcase vent by aswracing ====== | ||
| - | + | The following is to share some dyno testing by aswracing of using the timing plug location for an additional crankcase vent. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4)) \\ | |
| - | The following is to share some dyno testing by aswracing of using the timing plug location for an additional crankcase vent. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4)) \\ | + | |
| First, a little background. \\ | First, a little background. \\ | ||
| In the stock configuration, the crankcase vents through a pair of "umbrella" valves, which are essentially check valves. \\ | In the stock configuration, the crankcase vents through a pair of "umbrella" valves, which are essentially check valves. \\ | ||
| There is a slight air inlet into the motor from a tiny hole near the umbrella. ((Hippysmack)) \\ | There is a slight air inlet into the motor from a tiny hole near the umbrella. ((Hippysmack)) \\ | ||
| - | It acts as both an oil drain for anything that gets past the umbrella and an air intake to keep negative pressure from getting too high. | + | It acts as both an oil drain for anything that gets past the umbrella and an air intake to keep negative pressure from getting too high. \\ |
| The pistons come down the first time and the crankcase air is expelled with the air being forced out through the umbrella valves. \\ | The pistons come down the first time and the crankcase air is expelled with the air being forced out through the umbrella valves. \\ | ||
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| There are two fittings threaded together and app. two feet of 3/8" I.D. hose was attached to the hose barb. | There are two fittings threaded together and app. two feet of 3/8" I.D. hose was attached to the hose barb. | ||
| - | |3/8" flare to 1/4" FPT fitting \\ with a 1/4" MPT to 3/8" hose barb. ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4))|Fitting and hose as installed on the bike.((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4))|Test bike (near stock 1999 M2). ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4))| | + | |3/8" flare to 1/4" FPT fitting \\ with a 1/4" MPT to 3/8" hose barb. ((photo by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4))|Fitting and hose as installed on the bike.((photo by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4))|Test bike (near stock 1999 M2). ((photo by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4))| |
| |{{:techtalk:ref:engmech:timing_plug_adapter_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:engmech:testing_cc_pressure_1_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:engmech:testing_cc_pressure_2_by_aswracing.jpg?direct&300|}}| | |{{:techtalk:ref:engmech:timing_plug_adapter_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:engmech:testing_cc_pressure_1_by_aswracing.jpg?direct&300|}}|{{:techtalk:ref:engmech:testing_cc_pressure_2_by_aswracing.jpg?direct&300|}}| | ||
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| Click on a chart to enlarge: \\ | Click on a chart to enlarge: \\ | ||
| - | |10 best pulls from the stock configuration. ((chart by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4))|10 best pulls from timing plug vent configuration. ((chart by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4))|Best stock pull and the best timing plug vent pull. ((chart by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1946516&page=4))| | + | |10 best pulls from the stock configuration. ((chart by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4))|10 best pulls from timing plug vent configuration. ((chart by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4))|Best stock pull and the best timing plug vent pull. ((chart by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/180842-crankcase-vent-question/page4?t=1946516&page=4))| |
| |{{:techtalk:ref:engmech:dyno_and_breathing_1_by_aswracing.gif?direct&300|}}|{{:techtalk:ref:engmech:dyno_and_breathing_2_by_aswracing.gif?direct&300|}}|{{:techtalk:ref:engmech:dyno_and_breathing_3_by_aswracing.gif?direct&300|}}| | |{{:techtalk:ref:engmech:dyno_and_breathing_1_by_aswracing.gif?direct&300|}}|{{:techtalk:ref:engmech:dyno_and_breathing_2_by_aswracing.gif?direct&300|}}|{{:techtalk:ref:engmech:dyno_and_breathing_3_by_aswracing.gif?direct&300|}}| | ||
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| Another surprise was just how easy it was to plug the hose with my finger, and how it felt when I did. \\ | Another surprise was just how easy it was to plug the hose with my finger, and how it felt when I did. \\ | ||
| The pressure was not great. \\ | The pressure was not great. \\ | ||
| + | |||
| + | ====== Regarding horsepower gains from different breathers ====== | ||
| + | From aswracing on testing breather vents for HP gain: ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-engine-conversions/38153-xr750-883-series-race-engine-venting-etc/page6?t=75740&highlight=reed+valve&page=6)) \\ | ||
| + | <blockquote>Many years ago, I spent most of a day dyno testing breather check valves. \\ | ||
| + | I was writing for Battle2win magazine at the time and published my findings there. \\ | ||
| + | The article is here at Nightrider.com: [[http://www.nightrider.com/biketech/crankvent_test.htm|Do Crank Vents work?]] \\ | ||
| + | |||
| + | I spent several hours on the dyno testing whether or not various breather arrangements affected the power of a motor. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/rubber-mount-sportster-motorcycle-talk-2004-2006/12512-crankcase-breather?t=20871)) \\ | ||
| + | Mainly it was a test of these breather check valve devices, but I also tested the recycling of the blowby versus venting to the atmosphere. \\ | ||
| + | |||
| + | {{:techtalk:ref:engmech:breather_valve_test_results_by_aswracing.gif?direct&700|}} ((chart by aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/rubber-mount-sportster-motorcycle-talk-2004-2006/12512-crankcase-breather/page2?t=20871&page=2)) \\ | ||
| + | |||
| + | The result labeled "kuryakyn" is the one that's recycling the blowby. \\ | ||
| + | So named because I used a kuryakyn adapter to send the blowby back into the intake tract. \\ | ||
| + | All the others are vented to the atmosphere. \\ | ||
| + | |||
| + | The bottom line was that none of them added a single iota of measurable horsepower, despite the grandiose claims of up to 7% from the manufacturers. \\ | ||
| + | The only thing I could get to show up on the dyno at all was the removal of the blowby from the intake tract.\\ | ||
| + | You can read all about the results in the Nightrider article above. \\ | ||
| + | One of the companies involved, ET products (maker of the Spyke Krank vent) took exception. \\ | ||
| + | I very carefully retested using their suggestions, but I got the exact same answer. \\ | ||
| + | </blockquote> | ||
