I too believe there must be a happy medium.
there isnt. its really that simple.
its like asking "can i have a DC engine that will also run on AC when i dont have DC available?"
no. the aswer is no.
horsepower=torque X rpm/5252.
to get an NA to make power, we need to make it REV. to make it rev, we reduce almost every single restricting factor in the intake-compression-combustion-exhaust system that it has. since we cant restrict the compression or combustion (in fact we want to make compresion HARDER), we're stuck with intake and exhaust. intake just needs a good free flowing head design so it can freely suck a nice
atomised breath of fresh O2 and a bit of fuel, as close to a 14.7:1 ratio as we can get it, so thats that out the way, now what can we do with the exhaust?
ok here is where it gets tricky
so the piston is coming down off its BAM on the combustion stroke, and then when it gets sorta to the bottom, it starts running out of puff, holywhatthefkshitballs its actually creating a vaccum as it comes down to the bottom of the stroke, what we need now is some way to stop it creating a vacuum, cos' thats actually stopping it from going down.
ok cool, easy, we'll open the exhaust valve. the valve cracks and although were trying to suck in an expended gas from the exhaust system, we're not actually sucking it in, we're just scavanging it from the other valve thats on the top of its exhaust stoke atm and we have "extractors" so thats a good thing, the top of the valve gets a bit of **** gas, but thats just gonna get pushed out anyway.
so easy, we've free'd up a but of HP by not restricting the downward stroke of the piston, ok now we're going up. and going up is hard cos' gravity is a bitch and life is hard. everything is cool. as we go up the gas is pushed out the exhaust valve cos' we have a nice free flowing exhaust and the when we get to the top, we have another piston is nice enough to suck out some gas for us like we did for it, so karma bitch, something to look forward to. so we can keep going up to the intake stroke.
but WAIT! whats that?? if we go to the top of the intake stroke with nothing but exhaust gas, that means the 80cc's or so of our cylinder head chambers are filled with extrememly hot and expelled exhaust gas! not only that our exhaust valve needs to be open fully when the piston is at TDC which means we cant get any lift out of it or itll hit the piston crown! hmmmm how can we fix this? hmmm ok, lets try somethign weird, lets open the intake valve only a few degrees before the exhaust valve closes, this MAY allow us to a) have a restriction free interchange betwen exhaust and intake on TDC, but not only that, because cylinder #3 is actually sucking a bit of gas out, its helping draw in cooler intake air into the exhaust b)a less saturated combustion chamber at the start of the intake stroke c) have a much cooler beginning to the intake cycle.
ok so that worked. and we've now descovered that our once lowly restrictive cycle, is actually a lot more "free" and by being more "free" hasnt actually made us any more able to produce "power" what it has done is help us "rev" higher. and as i said earlier:
horsepower=torque x RPM / 5252
doesnt matter if you made more POWER [read: torque] youve made more RPM. which has given you more
horsepower. which is not actually POWER. its just horsepower. a magic number devised to show off to your mates about.
NOW, here is why it wont ever work.
namely:
overlap is gonna SUCK. why the fk would you want to build pressure just to force it out the exhaust when youre at the top of your intake cycle? overlap will not be your buddy. itll be the opposite of your buddy. itll be that arsehole thats better looking than you and chatting to your ex at a party. thats how **** overlap would be.
not only that, but people dont think of lift. ok lift. lift right? thats free HP right? isnt that what all the 6 banger fanbois say about mace rockers? yeah man, cam in a box.
guess what? a valve spring isnt easy to compress. when you have 16 of them theyre a lot less easy, and when you have 16 that used to compress to .430" and now compress to .600" they become a LOT LOT less easy to compress, which in turn causes friction and drag.
"who cares? its a 400hp engine, itll compress it no probs! its got oil and **** in there, lubed to fk"
yeah, for an NA engine, we use lift as a
sacrifice the longer you can spread out a valve and the slower the ramp, the less strain on the valvetrain, than thus
*free hp* les heat, less wear, less strain, less work= more horsepower cos' can rev longer.
now, if you can just explain to me why you would need these things when air is actually waiting at the throttle body at a 1 atmosphere, then +1 atmosphere at all times, thats'd be great.
(i got bored with typing)
XXX
also id just like to state that ive had a few largers, and this probably wont make any sense to me tomorrow morning.