It would be nice, wouldn't it? The problem is that vacuum may be cheap, but manufacturing for a permanent vacuum is ungodly expensive - you need perfect fittings over the entire block and valve head faces, including the studs, or the more "practical" method would be to add a pump to maintain the vacuum, which is heavy and adds the costs you'd like to eliminate. Currently this is impossible for all sport and commercial uses...but who knows what the future will hold?Zynerji wrote: ↑Fri Jan 12, 2018 3:15 pmJust thinking here a bit. What are the thoughts on using lapped "studs" that are assembled in a vacuum instead of bolts? Just having a small (3mm) stud milled on the face of the head with a matching reamed seat milled into the block, and in a deep Torr vacuum, slid together (sealing the negative pressure in the pocket) and then letting the chamber repressurize to atmo.
No hardware = less weight
No rebuilds/sealed engines = no a field access needed
Can also be used to eliminate gaskets by using a tongue and groove approach instead of studs.
Vacuum is cheap. Does anyone have a thought on this?
https://en.wikipedia.org/wiki/Neutron_starA neutron star is so dense that one teaspoon (5 milliliters) of its material would have a mass over 5.5×10^12 kg (that is 1100 tonnes per 1 nanolitre), about 900 times the mass of the Great Pyramid of Giza.
My first post lists a whole lot of issues why, from an engineering point of view, it wouldn't work.
Much of the work in improving the engine involves playing with the head and the top of the combustion chamber. Easier and cheaper to have separate castings in that case as you can leave the block alone and just cast new heads.Big Tea wrote: ↑Sat Jan 13, 2018 1:04 amThe original point, that of not having head bolts etc is still valid though isn't it?
How come, with modern techniques, F1 engines still have a separate head?
Is it due to the access to the valve area, and setting up clearance, or is there a good reason for having a lid that comes off?
That's because this only requires common physics & math knowledge to know it won't work.
Not to mention it would be next to impossible to machine the inside of a cylinder head using standard techniques.