I have a stove top percolator for making espresso. It does not generate any crema. it possible to do so with a stove top percolator?
Moka pots (or stove top percolators) usually produce a pressure of around 1.5 bar, while most coffees require a pressure of at least around 6 bar for a crema to appear. However, there are some Moka pots with a special valve (called Cremator) which helps creating more pressures and thus produce a crema.
By the way, a real Espresso has to be brewed with a pressure of 9 bar ± 1, according to the Italian National Espresso Institute, so it can't be brewed with a Moka pot.
i read that the coffee bean type makes the difference. 100% arabica beans make no creama, while robusta beans do, however arabica tastes better, so mixing the 2 types will make a good tasting coffee and crema. problem is mixing. lavazza sells already mixed in one bag w/ different combinations of each bean. other important variables are grind size and water temp. the more u read about it the more u will realize that espresso is an elusive and difficult drink to make at home. the espresso gurus say the type of pot/machine is not as important as type of grind and grinder. ck out https://prima-coffee.com/learn/article/making-espresso if u want crema and no guess work, try out a nespresso machine and coffees. expensive but worth it if espresso and coffee are your drinks of choice.