I know there is a 3 valve.. in my dads tractor trailer.
not impressive. alot of repairs in the heads. big compression needs a big two valve.
if an engine is designed for air, it gets it.
the four valver setup is meant to be for grandma take offs and slow slobbering ecus and injection monitoring it all...and then tell the youth "oh yeah, these little engines are bigger than ever"..
if you haven't noticed, HP numberrs have doubled without perormance to match it... you may have guessed.. ever since the four valve heads and big goofy injection.
a diesel is rather slow in this subject... does not need it.knowing insanity called automotive engineering, some schmuck (cough-VW-cough) will add four valves and claim it a performance booster.
