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Hey all, I am in the process of calculating the ideal intake manifold length and was just looking for a second opinion here.
the picture below is what is in my repair manual on the degrees of my intake and exhaust valves
so what I needed to do was calculate how long the intake valve was open and closed.
calculating open intake in degrees: 276
I got this value by adding 28, 180 and 68 together
calculating closed intake in degrees: 456
since I already had the amount of time that the valve was open I began to calculate the time closed by simply subtracting 276 from 720 degrees; 456
anyone have obligations to these numbers? im going off of what the diagram was telling me, but thats all the info i have so I am hoping that it is correct.
dunno, I think it's going to be a little more complex, what are those open and close numbers at as far as lift? how are you going about calculating intake length?
dunno, I think it's going to be a little more complex, what are those open and close numbers at as far as lift? how are you going about calculating intake length?
If the intake valve is open 276° of the cam, then it's closed 84° (360 - 276 = 84). Double it if you want degrees of crank rotation instead of cam rotation.
It's not an exact science since you're approximating the speed of sound anyway. I doubt there's much difference between the inside of the intake valve or the inside of the combustion chamber.
Also, wave tuning is only good for a couple of percentage points of power. I'm not saying don't do it, but let's say your GS850 is putting out 50 horsepower at 6000 RPM. 2% increase nets you one pony. You're not going to be able to tell the difference.
honestly the only reason why i was trying it was to rough calculate a proper intake length for the bike. im not into horsepower gains on the 850, the thing is a rolling tank.
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