A/J that is a great explanation on cylinder pressure's
But Im from MO so I need more.
When you refer to intake valve closure what range of degrees ABDC would you consider too late? Thus causing low cylinder pressures at low rpm's?
That all depends on static compression. Mine for example, has a static of 10.1:1, dynamic of 7.99 and cranking pressure is 175 PSI even with an IVC of 70 degrees.
Change the static to 8:1 and that makes the dynamic fall and eats up a TON of cylinder pressure. So it's all relative.
