What is the peak torque of a Porsche camshaft?
Porsche’s factory camshafts were specified based on 0.1 mm (.0039 inches) valve clearance. A reasonable rule of thumb for a 911 engine (based on the lifts being measured with 0.1 mm of valve clearance) is that the peak torque engine speed will be a function of the following equation: a. Peak torque engine speed = -3151+ (Duration * 32.53) b.
How does Porsche 906 camshaft work at 8000 rpm?
As a result it is not unheard of for some of the smaller engines using the full-race 906 cam to achieve 8000 RPM reliably using stock valve springs and retainers. More modern cams have been designed to open the valves faster thus allowing the cam to act like it has a longer duration, while still keeping overlap to a reasonable level.
What is the function of a camshaft in an engine?
At it’s simplest, the function of a camshaft is to open and close an engine’s valves in synchronicity with the pistons cycles. How it does this has a fundamental impact on the speed with which each cylinder is filled, the acoustical tuning of the exhaust and intake systems and the functional compression ratio of the engine.
What’s the difference between E and s camshafts?
The 2.2 S head on the other hand (also used in the 2.7RS) keeps flowing more air all the way up to .5 inches. If you were to use an E cam which only lifts to about .4 inches with an S head, you won’t even be using the last 25 CFM of flow that the cam and heads can provide.
Porsche’s factory camshafts were specified based on 0.1 mm (.0039 inches) valve clearance. A reasonable rule of thumb for a 911 engine (based on the lifts being measured with 0.1 mm of valve clearance) is that the peak torque engine speed will be a function of the following equation: a. Peak torque engine speed = -3151+ (Duration * 32.53) b.
What do you need to know about a Porsche camshaft?
1. Duration: In general the intake duration of the camshaft will determine where in the rev range the peak torque will occur. Unfortunately camshafts often have their duration listed based on different measurement methods. Porsche’s factory camshafts were specified based on 0.1 mm (.0039 inches) valve clearance.
As a result it is not unheard of for some of the smaller engines using the full-race 906 cam to achieve 8000 RPM reliably using stock valve springs and retainers. More modern cams have been designed to open the valves faster thus allowing the cam to act like it has a longer duration, while still keeping overlap to a reasonable level.
How do you adjust the camber on a Porsche 911?
It is much easier to adjust camber if you can get under the car in an inspection pit or on a lift, then you can loosen the 19mm bolts slightly and adjust the camber and toe from below without removing the wheels, and get an idea of the changes by measuring the camber directly with the method explained below.