I agree that's the keyword.keyword is: scavenging effect
Here's from wiki:
Air "slow down" and "speed up = reduced scavengingFor example, fast flowing heads and a tunnel ram intake combined with a poorly planned camshaft and exhaust system will cause the air to "slow down" and "speed up" throughout its journey, thus reducing its scavenging potential. So, to increase scavenging potential, the air must maintain a positive linear acceleration curve.
Air positive linear acceleration curve = increased scavenging.
For me that's a very simple concept: you want to kick air (exhaust) out from the piping as fast as you can.
So imagine if there's no piping at all?
It's as if trying to kick out something, that is already out.
---------- Post added at 03:35 PM ---------- 6 hour anti-bump limit - Previous post was at 03:26 PM ----------
That's why I said we need to define the problem. Is it:even F1 have manifold but nothing after that...
1. Performance problem? (performance loss)
2. Aesthetics problem? (dirty engine etc.)
3. Practicality problem? (noise, fumes, pollution, tikus & lipas masuk block etc.)
4. Law/legality problem? (JPJ, F1 rules, etc.)
Imagine one person who decides to focus only on performance and performance alone, he will do without exhaust piping at all. B-U-T as I said of course dirt & cockroach will enter the block, engine will have to be rebuilt after every run, engine will be dirty, loud unbearable noise, fumes and F1 will say no you cannot enter the race.
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