batman
Serious Thumper
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SuzukiSavage.com Rocks!
Posts: 3806
osceola new york
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In an ideal world ,we could put the DR650 head on the Savage ,run a stage 3 cam , and make 50 hp. both these motors have nearly the same displacement ,but are completely different. If we assume the valve size is the same as FAST650 stated ( it would be hard to make them larger in a 4 valve head) ,then how does the DR650 draw in as much fuel and expel as much exhaust gases as the Savage ,with a stroke 13% shorter? Higher valve lift, longer duration, and a better designed exhaust passage. Is the high lift of the DR cam ideal ? Hardly ! but it was the ONLY way Suzuki had to make the motor work. The shorter stroke ( thus higher rpm/hp), and the cylinder leaning forward , allowed the frame of the bike to be more compact , and weight and seat height lower . (important for a dirt/race bike).the DR650 makes 47.5 hp stock with a 9.5:1 compression ,but printouts show it only making 46.3 hp in a Savage with 97mm piston at 10.5:1 compression, after market carb and exhaust. the DR cam has 30% more lift than Lancer's stage 3 cam ,but is only making maybe 5% more power. It's my thought that the high lift of the DR cam is overkill and not suited for use in the Savage.
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