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Message: <blockquote data-quote="rollakid" data-source="post: 686040" data-attributes="member: 6588">but there's one thing i want to talk about is the number of cams you have and the number of valves you have. they seems to be different topic.for what i know so far, sohc deals with both intake and exhaust valve with the same cam and use rocker arm to move them. advantage is simple and weight less and the head can be smaller. however, with the rocker arm and stuff, it produce more friction, thus not good on high revs.dohc on the other hand have less friction, thus able to spin faster. they produce more power probably because they can tune different timing for intake and exhaust, instead of just retard or advance in the sohc. which makes dohc better at high rev (?)and about the sohc have lower end power and dohc have higher end power, i personaly think (without any profesional knowledge, just some common sense and simple automotive information) that it depends more on the number of valves. with a lower profile and duration cam for normal car use, your engine cant rev high. and because of that, having a 4valve/cylinder head would be a disadvantage because engien power depends very much on velocity of air rushing into the engine. with 2 intake port, the air velocity will be lower, thus lower power. this also makes 3valve better than 4 valve at low rpm, and this is also the reason why toyota use TVIS to close 1 valve so the air can rush in faster through the other valve.at high rev, single intake port isn't enough for all the air to come in thus having 2 port for intake helps alot. thus multi valve engine head is better for higher revs.but then, there's alot of things i'm not clear yet. i heard honda's D16B runs 16valve sohc, dunno true or not. and on top of that, toyota's old 2TG engine runs 8valve, yet DOHC.i really hope some more experienced sifu can continue where i can't explain. i think this is worth discuss at least.</blockquote>

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