bentwheel
Serious Thumper 2005 No Login
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Ride free, citizen
Posts: 658
Sarnia, Ontario, Canada
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There has been some current discussion on the chances of large single air cooled engines beeing prone to overheating. I still believe it is not a problem for the Savage, but in light of recent high temperatures I do think we should be careful not to restrict airflow to our engines. When I was looking for a place to mount my leather tool bag (large) I resisted placing it on the traditional spot on the lower triple clamp. It was my thought that it restricted proper airflow to the head and cylinder. I understand airflow and I realize that at speed the cooling air will get around the bag but the airflow becomes interupted and tumbles across the head and is less effective than if it was undisturbed air. Let me give you an example of what Kawasaki learned in its wind tunnel. Years ago, when designing the ZX1200 (I think) to attempt to outrun the Hyabusa it had its air intake flush mounted on the fairing. This particular induction system (ram air) requires the air box to be pressurized and Kawasaki discovered the air box pressure inadequate. The air intake being flush mounted was receiving disturbed air from the fairing, so extended the air intake with a two inch extension so it could slice into undisturbed air thus pulling in considerable more new air to satisfy this induction requirements. Keep in mind this technology was required to attain speeds of 300 kph. What does this have to do with a tool bag mounted in front of your cylinder? Well I think you get the idea that you could be robbing your engine of quality cooling air. Probably not enough to do damage, but for a borderline engine just MAYBE enough to cause some concern. Before I bought a Savage and joined this board I hung out at the BMW F650 site. This group, although they love their bikes are not a fan of Das Korporation. Let me give you an example of what BMW constitutes as reckless modifications causing overheating. Installing fork gaiters causes reduced airflow to the radiator! This is real stuff and I am not making it up. BMW actually sent service bullitins to its dealership ordering to void overheating related warranties if owners installed these gaitors. This last example in my opinion is extreme but food for thought nevertheless.
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