It costs less to make cast cylinder heads, it's quicker and a cast cylinder head is better than a billet one because it dillates and deforms less. Billet = stronger but less durable (in F1, Nascar, ... endurance racing, cast cylinder heads are used).

es buena pregunta pero mmm... tal vez la densidad cumpla un papel importante.

Way, way cheaper than machining billet.

@SomeTechGuy666 Maybe. Once a program is dialed in CNC is very efficient and fast. Once the chips are weighed and sold that is.

Magmasoft is a good casting sim software

3D printed most likely

3D printed

AlSi10Mg0,3

Generally aluminium shrinks by 4% so when designing the patterns everything has to be 4% bigger in all directions. Then allow for machining, so faces that will be machined generally will have about 6mm added to them . Also it’s quite hard to centralise the casting when machining so on quite a long part like a cylinder head datum’s have to be checked. . What few people realise is that core plugs on bocks and cylinder heads are not there to stop the block cracking in a frost . They are there to support the cores ( cores for the cavities / water jackets ) . These can be clearly seen in the video. Quite hard to spot or understand if your not used to working in reverse/ negative. These are sand cast heads or old school ideal for small / medium batches . On some more modern engines they use pressure/ vacuum casting techniques usually injecting alloy from a large reservoir below and either forcing the material up and use a vacuum to get rid of the gasses . This improves quality and reduces chilling . Also on large batch production they will have a machine making the cores and a conveyor system to feed an automatic casting machine .

​@@newagetemplar6100 sir, where did you acquired that amazing knowledge?

@@chumbeque4561 hi , just through a lifetimes worth of engineering, I had a very good friend who had been a pattern maker all his life and used to go down at night to his workshop. All hand done using old school techniques , sand boxes , contraction rates / shrinkage etc etc . Then I had my own castings made for WRC alloy uprights and machined them myself. This also ran along side my fibreglassing skills that I had leaned previously. I am now building a BMW E36 GTR race car with all composite panels and alloy uprights . I’ve been very luck in that respect as YT wasn’t around in the early 90’s . Fortunately now there is a vast amount on YT for people not as fortunate as myself . Many thanks for your kind comment. 😇🇬🇧

@@newagetemplar6100 In the case of pressure/vacuum casting would the part still shrink ~4% or does it maintain the dimension after cooling? Similarly, would a tall sprue/feeder supply enough head pressure to decrease the shrinkage as it cools? also would pre-heating the sand mold have any affect on shrink rates if it is allowed to cool slower?

@@PhaseFabrication the shrink rate is a constant, thermal characteristic of the alloy. i have three rulers that are not allowed to be mixed up. brass, iron, aluminium. theyre precalibrated patternmakers rulers with the offset already applied. doesnt matter how its done, aluminium always shrinks a certain amount as it cools from a certain temperature.

We use NX for product abd tool design. Custmer's model was Creo

@@krisztianhernek685 thank you so much!

​@@krisztianhernek685, is this your factory?

I appreciate your comment.