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Showing results for tags 'cfm'.
Found 3 results
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Just wanted to post this for feed back. I have been trying to think of ways to dress up the air intake/filter box area. Not looking for high performance just visiual appeal. My bike is an 08 RSV and I have added some RK mufflers. This is the only mechanical modification that has been done. I first started off by trying to find out how much CFM the stock filters drew so I would not be messing with fuel/air mixtures. Let me state I have no technical skills at all. Just about everyone that I've seen that has altered the air intake has had to adjust or re-jet and shim needle valves!?!? Seems the filters they used drew way to much air and exceeded the cfm required by the RSV. The only way I could come close was to call K & N and they gave me the info on CFM of the replacement filter for the RSV. Part #YA-1399 has 338 cfm. Then I looked at different types of "Pod, Pancake" type filters. Nobody making filter is willing or knows how much CFM there filters draw (except K&N). I wanted to keep the filter size small so that I would not exceed the 338. Thinking that K&N was a high flow filter, the stock must draw less. Also the stock air box has only a 1.5 inch hole drawing that air through. I was able to get info on several filter that looked good and had the low cfm draw. I decided on a small 4.5" round chrome pancake filter that is 1" thick. The filter is reusable/washable and oil charged. I fabricated small brackets to secure it solidly and also got some muffler pipe to form a connection between filter and intake hose. The filters draw 127 cfm each. I've had them on for a couple days now and have ran the bike on the highway and in town. Running through the rev limits and down shifting. There has been no hesitation of sputtering at all. Lots of get-up and go. Have only put about 20 miles on her so far. As for the filter being small my thinking was the stock flliter box is roughly 9.5L x 5W x 4.5D with a small 1.5 inch hole drawing air into a filter that is roughly 5.25L x 3.5X x 3.5D. The outside box makes the filter look bigger than it really is. If I need to go up in filter size or cfm K&N also has several round and oval styles with cfm draw of 172 to 269. Have included some pictures to show how it looks. Sure would like to here some of your thoughts (good/bad, postive/negative). Or if anyone would like more information just let me know. Thanks for reading, Dennis
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I'm trying to find out if there is any other air filter and housing that can be used on a 2nd Gen Venture. I called Yamaha and asked if they could give me the cfm draw of a stock filter and housing. They told me that was info that they could not give out. So I've been posting on another site and thougt I would post here to see if anyone else might have some knowledge on the subject. I got some info on another forum of someone using these http://cgi.ebay.com/ebaymotors/Honda-Kawasaki-Suzuki-Yamaha-NEW-Chrome-Air-Filter-45mm_W0QQcmdZViewItemQQcategoryZ35595QQihZ012QQitemZ220310739471QQtcZphoto They have had good results and have not had to rejet. Also someone found this company that sounds like they could make an adaptor plate to fit the application. http://www.vesquared.com/ramflo/index.htm The problem here is we don't know the cfm of the stock Venture. Just trying to come up with something else that would not require rejeting and would not cause problems (running lean or rich). I'm not mechanicly smart and just looking for something to bolt on. Also a way to dress up the Venture without spending lots of cash!!!!!
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Does anybody know how many CFM that these BDS 34x4 Mikuni carbs on our bikes put out. How about a simple formula to figure it out? pi*(bore/2)^2*stroke*number of cycinders*max rpm's/3456 = CFM needed or, pi x (2.99/2)^2 x 2.60 x 4 x 8500/3456 = 180CFM needed.
