Fast Eddie
VIP MEMBER
- Joined
- Oct 4, 2013
- Messages
- 20,723
Gents,
Having rummaged around in my underseat area recently, I had a quick look at the intake set up.
First thought, as has been mentioned by others previously, that airbox looks way too small for 961cc of sucking at a high rpm.
Second, ditto for the single air filter in the air box.
Third, the air intake is right under the seat. I know the seat isn’t air tight, but neither is it an obviously good design for air flow either. I can’t see how the intake could suck enough air in for anything other than short bursts of open throttle, any sustained requirement would surely be restricted by the air it can suck from between the seat and the frame rails etc?
I once had a bike on the dyno and played around with the fuel tank position which seemed to me to be a little too close to the end of the velocity stacks for comfort. It was quite surprising to see the measurable difference on the dyno caused by obstructing the air flow somewhat, even though, to look at, you’d think there was plenty of flow to the stacks. This experiment resulted in re-worked fuel tank cos the difference was so marked.
Having rummaged around in my underseat area recently, I had a quick look at the intake set up.
First thought, as has been mentioned by others previously, that airbox looks way too small for 961cc of sucking at a high rpm.
Second, ditto for the single air filter in the air box.
Third, the air intake is right under the seat. I know the seat isn’t air tight, but neither is it an obviously good design for air flow either. I can’t see how the intake could suck enough air in for anything other than short bursts of open throttle, any sustained requirement would surely be restricted by the air it can suck from between the seat and the frame rails etc?
I once had a bike on the dyno and played around with the fuel tank position which seemed to me to be a little too close to the end of the velocity stacks for comfort. It was quite surprising to see the measurable difference on the dyno caused by obstructing the air flow somewhat, even though, to look at, you’d think there was plenty of flow to the stacks. This experiment resulted in re-worked fuel tank cos the difference was so marked.