Table of contents
- Tried: replacement air filter Air number
- Yamaha with No Toil
- Yamaha with K&N
- K & N
- K & N
- No toil
- Yamaha original
- Yamaha with BMC
- Yamaha original
- No toil
- Yamaha with BMC
- Yamaha with K&N
- Yamaha with No Toil
accesories
Tried: replacement air filter
Tried: replacement air filter
Air number
The manufacturers of retrofit air filters promise more performance through higher throughput. Is it all just hot air or useful fine-tuning? MOTORRAD tried it on two bikes with carburettors and injection systems.
Uli Holzwarth
December 04, 2001
As is so often the case in life, it is also important to have the right mixture for the combustion engine in order for the spark to jump. In extensive tests, the motorcycle manufacturers determine the optimal compromise between perfect throttle response and the best possible performance of their machines while complying with legal noise and exhaust gas regulations.
Nevertheless, many bikers hope to be able to improve the power output by intervening in the periphery of the engine. For example, by replacing the standard air filter with an accessory with a higher air passage. However, this measure often does not have the desired effect.
No wonder, since the otherwise neglected air filter plays a decisive role in the mixture composition of an engine: Due to the flow resistance that it opposes to the intake air, it influences the pressure conditions in the intake tract along with other parameters. Air filter elements with significantly lower flow resistance reduce the intake manifold vacuum at the same speed and throttle valve or throttle slide position. In the normal slide carburetor, the fuel / air mixture becomes lean, and even the constant pressure carburetor can only partially adapt the mixture to the changed conditions thanks to the vacuum-controlled gas slide. As a result, there is not only a loss of power, the combustion temperatures can also rise significantly and put more stress on the engine. Modern injection systems alone are able to keep the mixture composition and thus the performance development constant with the help of the recording of various parameters.
This is also confirmed by the test bench comparison of three allegedly performance-enhancing replacement filters from the accessories on a BMW R 1100 S. as well as one Yamaha YZF-R1. While the on-board computer of the BMW injection allows around 40 percent higher air throughput (according to K&N and BMC) almost compensated, the R1 equipped with carburettors reacts with significant losses in certain speed ranges. The replacement filters can deliver the promise of increased performance without time-consuming and costly adjustment work – which lead to the expiry of the operating license – i.e. neither with BMW nor with Yamaha.
Yamaha with No Toil
Provider: Mobil-Tech, Telephone 07424/6140 Price: 139 MarksDesign: Foam soaked in oil, pulled over a wire cage that gives it shape Change intervals: no change necessary; Washing recommended every 5000 kilometers (road use) Comments: comparatively expensive replacement filter with very short maintenance intervals; Performance and torque curves at series level, but slight losses between 5500 and 6500 rpm
Yamaha with K&N
Provider: Racimex, Telephone 040/7392000 Price: 148 MarksDesign: cotton fabric soaked in oil, coated with stainless steel wire mesh Change intervals: no change necessary; Wash out every 40,000 kilometers (road use) recommended Comments: Most expensive replacement filter in comparison with minimal losses in peak performance, but significant drops from 5500 rpm, especially in torque; Adjustment of the spray required
K & N
Provider: Racimex, Telephone 040/7392000 Price: 109 Mark Design: cotton fabric soaked in oil, coated with stainless steel wire mesh Change intervals: no change necessary; Wash out recommended after every 40,000 kilometers (road use) Comments: Relatively expensive, washable replacement filter with 40 percent higher air throughput (manufacturer information) without model-related operating permit; Peak performance minimally below series level
K & N
Provider: Racimex, Telephone 040/7392000 Price: 109 Mark Design: cotton fabric soaked in oil, coated with stainless steel wire mesh Change intervals: no change necessary; Wash-out recommended after every 40,000 kilometers (road use) Comments: Relatively expensive, washable replacement filter with 40 percent higher air throughput (manufacturer information) without model-related operating permit; Peak performance minimally below series level
No toil
Provider: Mobil-Tech, Telephone 07424/6140 Price: 89 MarksDesign: Foam soaked in oil with stabilizing foam rubber frame Change intervals: no change necessary; Wash out recommended after every 5000 kilometers (road use) Comments: Foam filter with higher air throughput without model-related operating permit; very short maintenance intervals; Performance development is identical to the series except for a minimally lower peak
Yamaha original
Supplier: Yamaha Motor Germany, Telephone 02131/20130 Price: 52.50 MarksDesign: Paper filter in a plastic frame, covered with a stabilizing wire meshChanging intervals: every 20,000 kilometers Comments: Inexpensive original filter; Part of the operating license; achieves the best power and torque values in comparison with a harmonious curve shape
Yamaha with BMC
Provider: BMC Motorsport, phone 07631/10330 Price: 146.16 MarksDesign: cotton fabric soaked in oil, covered with aluminum wire mesh Change intervals: no change necessary; Wash-out recommended after every 15,000 kilometers (road use) Comments: Relatively expensive replacement filter with minimal losses in peak performance, but significant drops in the middle and upper speed range; Adjustment of the spray required
Yamaha original
Supplier: Yamaha Motor Germany, Telephone 02131/20130 Price: 52.50 MarksDesign: Paper filter in a plastic frame, covered with a stabilizing wire meshChanging intervals: every 20,000 kilometers Comments: Inexpensive original filter; Part of the operating license; achieves the best power and torque values in comparison with a harmonious curve shape
No toil
Provider: Mobil-Tech, Telephone 07424/6140 Price: 89 MarksDesign: Foam soaked in oil with stabilizing foam rubber frame Change intervals: no change necessary; Wash out recommended after every 5000 kilometers (road use) Comments: Foam filter with higher air throughput without model-related operating permit; very short maintenance intervals; Performance development is identical to the series except for a minimally lower peak
Yamaha with BMC
Provider: BMC Motorsport, phone 07631/10330 Price: 146.16 MarksDesign: cotton fabric soaked in oil, covered with aluminum wire mesh Change intervals: no change necessary; Wash-out recommended after every 15,000 kilometers (road use) Comments: Relatively expensive replacement filter with minimal losses in peak performance, but significant drops in the middle and upper speed range; Adjustment of the spray required
Yamaha with K&N
Provider: Racimex, Telephone 040/7392000 Price: 148 MarksDesign: cotton fabric soaked in oil, coated with stainless steel wire mesh Change intervals: no change necessary; Wash out every 40,000 kilometers (road use) recommended Comments: Most expensive replacement filter in comparison with minimal losses in peak performance, but significant drops from 5500 rpm, especially in torque; Adjustment of the spray required
Yamaha with No Toil
Provider: Mobil-Tech, Telephone 07424/6140 Price: 139 MarksDesign: Foam soaked in oil, drawn over a wire cage that gives it shape Change intervals: no change necessary; Washing recommended every 5000 kilometers (road use) Comments: comparatively expensive replacement filter with very short maintenance intervals; Performance and torque curves at series level, but slight losses between 5500 and 6500 rpm
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