Thread 28515343

Why can't valves open outward instead of inward? That way interference wouldn't be a problem anymore.

How would it hold compression? You would need an insanely heavy and possibly complicated top end mechanism like an overbuilt desmodromic system.

Look in to rotary valves, they accomplish the same goal.

Congratulations, you just invented flathead.

>>28515350
That's not how flatheads work anon.

>>28515343 (OP)
See >>28515348

The valves are held closed by the pressure of the explosion on the power stroke. If they opened out, you would have an explosion thousands of times a minute trying to push them open

>>28515377
>valves open outward
I mean, it quite literally is.

>>28515523
It's not anon. The valves are simply in the block and facing up instead of in the head and facing down. They still push inward into the combustion chamber to open.

>>28515377
That is exactly how flatheads work, chud.

Visual aid for people unfamiliar with flatheads.
The combustion chamber extends from piston to valves. Horrific burn patterns and doesnt do well with high compression or forced induction.
There is no issue with interference but the consequences are shit for performance.
You can run overhead valves and not be an interference engine- its all dependent on combustion chamber shape/size and reliefs in pistons.

>>28516060
Spark plug / burn pattern starts at valves

>>28515923
That is not how flatheads work, retard.
They still open inwards into the combustion chamber, they are just flipped and offset so they do not interfere with the piston travel.

>>28515343 (OP)
>Why can't valves open outward instead of inward?
B-because they... BECAUSE THEY JUST CAN'T OK!

>>28516060
Oh, would you look at that, valves open outward and there is no problem with interference, just like OP asked.

Absolutely fucking terrible turbulence, the head would barely breathe like that.
Air is a fluid, it would just get caught on the opening valve.

>>28516484
This was my first thought but I was too lazy to look for supporting evidence. The flow would be turbulent af.

>>28515343 (OP)
Get back to watching faggoty tranime, this board is for men.

>>28516060
>>28516065
Why hasn't flat head technology been improved apon?
It's only being used in lawnmower engines.
More spark plugs?
Fancy designed pistons?
Multiple fuel injection points?
Valves at an angle closer to vertical?
Four smaller valves around the piston?

>>28515348
I'm back and heres what rotary valves are

>>28516782
It was improved.

>>28516782
>Horrific burn patterns and doesnt do well with high compression or forced induction.

>>28517054
so make it dont so that??

>>28517067
Hence overhead valve (OHV).