How is seat angle related to engine performance?
Valve seat angle is related to both engine breathing performance and valve seat wear durability. Larger valve seat angle can improve valve flow but may cause more lateral sliding movement and seat adhesive wear than smaller (flatter) seat angle under cylinder pressure loading.
Can a cylinder have a 60 degree seat angle?
Finally, flow and turbulence downstream of a stationary valve with a 60 degree seat angle positioned at the head of an endless cylinder is investigated (Case 3) [ 7 ], Cases 2 and 3 were examined using the code developed at UMIST [ 5 ].
How tall should armrests be at the back of the seat?
They should not engage the bony parts of the elbow where sensitive ulnar nerve is close to the surface so a gap of approximately 4″ between the armrest and seat back is recommended. Cantilevered elbow rests should be 8-10″ above the seat surface height. Armrests should be at least 17.2″ apart to exceed thigh breadth of 95th percentile females.
Which is the best angle for sitting on Your Side?
At this angle the pressure on the intervertebral discs is minimal. “Keegan’s normal posture” – X-ray studies on 5 people lying on their sides (1955, 1960) show that stresses on the spine are most evenly distributed when legs are at 135-degrees from torso, i.e. 135-degrees hip angle and 45-degrees knee angle. 7. Seat Design Criteria
What’s the best way to adjust the seat?
Slide the rails forward or back, then tighten up again. Tightening the clamp onto the rails of the saddle. Note the seat position is a bit forward — this position is good for climbing. Seat angle: The seat angle determines how much the seat contacts the front of your crotch, versus your butt.
How do you adjust the angle of a seat post?
On some seat posts, the seat angle is determined by changing the balance between the front and the back mounting bolt. If you have a bolt in front AND in back of the seat post clamp, loosen one slightly while you tighten the other. Adjusting the seat angle on a two-bolt seat. Note how far back this seat is.
How to adjust seat height in BMW 1 series?
Comply with the instructions on head restraint height on page 48, and on damaged safety belts on page 51. Observe the adjustment instructions above to ensure the best possible personal protection.
What causes the seat tube angle to be different?
Seat tube angle can be quite well made up for with fore-aft saddle position, so 2 degrees in difference can be easily neutralised. And the differences in angles between sizes may come from various sources: it could be forced by the design, for example to avoid some weird top tube length or too short distance from the crank to front wheel.