lol.
why is the YB crap?
Crap might be an overstatement, but i'll take plenty of other engines before the YB.
As edde said, boost can indeed do wonderful things.....just look at what it does to the 20v vag unit, which in NA trim would be, and is, terrible.
But one thing explains the love for them..................cosworth. The gucci of marques.......your cool if your cosworth innit.
The YB, as you have predicted quite well, has an absolutely HORRIBLE head. It has massive 35mm valves, which even for today is fantastic, current civic type R's and the likes have only recently made the move to 35+mm inlets. Yet, for all the valve area it has, and admittedly, quite a nice flat chamber.......it flows almost aswell as a stock 172 head, but a 172 head has 2mm smaller valves, and the ex port considerably rapes the YB by about 15%.
The head can be made to flow well, but my god does it take alot of work and larger valves yet, so per valve area, its not the most efficient. A stock CTR head flows as good as a full bore YB head.
They are slung into everything because they are a 'cool' engine and there are extensive drivetrain solutions, parts are cheap, every man and his dog knows about YB's.
Its a fancy pinto.
The Millington Diamond took the design and made it work.....along with hart.
Why bother with a YB when you can run 640bhp on a stock K24 honda engine with a turbo kit, at considerably less money. Hell, 500bhp on a stock nissan SR20DET, and i hate those engines.....3sgte, beams....the list goes on and on.
YB is ok, but not worth the hype its got due to magazines and its racing history.
