What is a good lobe separation angle?
Some engine specialists refer to it as that 106 sound—the NASCAR and short track oval sound where preferred lobe separation is usually specified between 104 and 106 degrees. The primary function of narrow lobe separation is to impel urgent acceleration off the turns when the throttle is opened.
How does lobe separation affect power?
“On a naturally aspirated engine, the lobe separation angle has an effect on whether the engine reaches peak torque a little earlier or later in the rpm range. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range.
Can you cam a supercharged car?
Overlap is the amount of time in degrees that the intake and exhaust valves are open at the same time, and excess amounts of it can work against your supercharger by allowing exhaust backpressure to negate supercharger pressure while the valves are open. Avoid any cam with more than 30-degrees of overlap.
How do I choose a supercharger cam?
Supercharging Basics – Camshaft Selection
- For best performance with a blower, look for a cam that has higher lift and longer duration on the exhaust side.
- Street performance with a blown engine is usually best with a cam that is ground with a 112 – 114 degree lobe separation.
- Blower cams can typically run “straight up.”
Does LSA affect vacuum?
Things like idle vacuum, fuel economy, and tuning all factor into picking the right cam. Tight LSA cams make excellent low-end torque and have a beautiful power curve. But nothing comes without a cost, and idle vacuum suffers as LSA shrinks. This causes the engine’s street manners and tuning to become fickle.
How is lobe separation angle calculated?
To check your LSA you calculate it by adding the intake and exhaust Lobe Centerline figures together and dividing their sum by two (Ex: 112 intake Centerline + 116 exhaust Centerline = 228 / 2 = 114-degree LOBE SEPARATION ANGLE).
What is lobe center angle?
First let us define the lobe centerline angle. In simplest terms it is the angle between the intake and exhaust lobe peaks. Notably, it is the only cam attribute described in camshaft degrees rather than crankshaft degrees.
What is a positive displacement supercharger?
A positive displacement supercharger pump (whether it is pumping fluid or air) is one that moves the same amount of a substance during each revolution: One liter of air goes in, one liter is pumped out the other side no matter how fast the pump is turning.
What is a tight LSA?
LSA is the distance from the centerline of the intake lobe to the centerline of exhaust lobe. It is the average centerline between both lobes and expressed in degrees ranging from 95 on the extremely narrow/tight side to upward of 120 on the wide end.