This is the angle between the intake and exhaust camshaft lobe peaks described in camshaft degrees. Gives more peak hp but less low end torque.Ĥ a) Lobe Separation Angle (LSA) Definition: Tighten Lobe Separation Angle (Increase Cam Overlap): Lift can be further increased proportionally by changing the rocker arm ratio without having to change the cam's lift spec.Ĥ. The ideal amount of lift for the desired powerband location is also affected by the size of the intake/IM runner, size and number of the intake valves, and the amount the intake valves are "deshrouded" from the combustion chamber's wall. Notice how the torque starts out equal at lower rpm, but the overall torque and horsepower are hurt by less lift, a sure sign of an engine that isn't getting enough mixture at higher rpm. The absolute peak torque and peak hp number also increases.Ĭam lift comparison: the cam with 0.200" (5 mm) more lift has lines with no dots. Moves or shifts the peak torque and peak hp location to a higher rpm. Legend for Figures Below: The red lines are comparing hp vs rpm. Do you want more duration? Do you want more lift? Do you want a smaller LSA (more This section is based on some lectures from Crane Cams and can help clear up some ideas about selecting cam specs for your engine package. from 5500 to 7200 rpm in a B18A/B and from 6000-8100 rpm in a B18C) or do you want the gain to be more in the midrange from 3500-6000 rpm? Remember that low rod ratio engines, like in our stock Integras, already make more power in the low to mid rpms compared to the higher rpms simply determined by the engine's piston geometry. Do you want to gain power in the upper rpm range ( ie. HOW DO THE CAM'S SPECS (LIFT, DURATION, OVERLAP or LOBE SEPARATION ANGLE, FLANK STEEPNESS) CHANGE THE POWERBAND OR TORQUE CURVE?īefore you start selecting cams, you may want to first decide where you want your powerband to be. Where Do You Want The Power Gain To Be Along the RPMs ( POWERBAND LOCATION) ? What is the PEAK WHP you are trying to achieve? AND 2. Before We Start - 2 Goals You Must Know: 1. Beginner's Understanding of Basic Camshaft Terms:ġ. I think this camshafts combined with a 4-1 header, will make some excellent results on the dyno.Ī. I found this very usefull information about vtec b series camshafts.Īfter reading the whole article, i think the best cams for a B16B is the toda spec b, since this cams gives more torque to the B16B engine hehe
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |