Page 1 of 2009 Flathead Power by S&S Cycle

a word about dyno numbers with a motto like proven performance® which is in fact a registered trademark of s&s® cycle inc it is very important that we be able to back up our claims regarding performance it is also vitally important to be able to evaluate new designs in our development process one of the tools we depend on for both of these functions is the chassis dynamometer something that needs to be understood about dynamometers is that the results from one dyno will not necessarily be identical to those from another dyno so comparing results from different dynos is bound to create a certain amount of confusion this is especially true with dynos from different manufacturers however results of tests run on the same machine can be compared with a high degree of confidence we can determine for example if a performance modification increased power or torque but there is a problem if you expect absolute values s&s cycle has chosen to use superflow® cycledyn dynamometers in our facilities in both viola and lacrosse wi because of the availability of data acquisition options that make these units well suited for development work there are other brands of dynamometers which are in common use in the performance industry these dynos will yield very reliable values for comparison especially when tests are performed on the same machine however values obtained from these dynos are typically a little higher than results obtained on a superflow cycledyn which value is correct it depends on who you ask an attempt at correlation we knew that we could not provide a 100 correlation between the superflow dynos that we use and other brands that are used in many shops but it was clear that some sort of yard stick was needed for comparison we conducted consecutive back to back tests of a wide array of motorcycles on our cycledyn and on a dyno from another popular manufacturer when the smoke had cleared and the data had been evaluated we found a consistent difference in values the competitive dyno read approximately 8 higher than the cycledyn based on this testing it is possible to multiply results from a cycledyn dyno by 1.08 to get a fairly accurate idea what readings the same bike would get on a competitive dyno it is also possible to multiply results from a competitive dyno by .926 to calculate the approximate cycledyn numbers in order to be consistent in our presentation of dyno information moving forward we will present dyno numbers from the superflow cycledyn dynamometer a small super flow logo by a dyno chart will denote that the test was performed on a cycledyn dyno we intend to retest our products on the cycledyn for future publications but that will take some time to complete so for the sake of consistency in the short term we will convert any dyno results from other dynos to approximate readings from a cycledyn we will note these as corrected rear wheel values if you are using a different dyno in your shop you can expect that your results will be about 8 higher than what we present in our catalog no absolutes in our literature and catalogs we publish dyno results so our customers easily can see how our products improve performance over stock however it must be remembered that these are comparative values and should not be taken as absolutes if a similar or even identical engine or motorcycle is tested on another dynamometer the results will more than likely differ this logo by a dyno chart indicates that the test was performed on a superflow® cycledyntm dynamometer dyno charts noted as corrected rear wheel values indicate that testing was performed on another type of dyno and the results were converted to show approximate readings from a superflow dyno order toll free 866-244-2673 index 2

[close]