i know this is far out there, but on the short turn radius on the exhaust port of a head is pretty restrictive. the way they are makes sense because the exhaust goes down and needs to not be in the way and look ridiculous but if you wanted an insane flowing head/ race engine, why not redirect the exhaust port pairs straight or almost straight upward and next to the valve springs. (if you look at a head you see a blank space where the ports could be on top) and attach a steel pipe there that forms a longer more gradual curve down to the exhaust. what kind of flow increase do you think this would create if it were possible and created better flow? it would seem like there wouldnt be enough space but you could make a port in rectangular/oval shaped to conform between the assemble rockers.

it might be an invalid idea, im not a cylinder head expert, but i wasnt sure if anyone else had thought of it. F1 lt1? lol

 

Where are you going to re-route the water jackets to? How are you going to fit an exhaust manifold/header UNDER the hood of the car?

 

That "restriction" is a venturi that causes a pressure drop and increases velocity of the gases improving flow, there for a reason...

 

thanks for the replys: i dont mean to have them come out on the intake side, there are no water jackets on the top of the head between the rocker studs, right above the pairs of exhaust ports. the way it ooks on the head, it wouldnt work to make it come straight out but if i could make it just a little better that's what i would want. relocation would be between the rocker studs and as close to the valve springs and valve guide as possible.

cookseyb: would you say the same for the intake ports? they are restrictive as well but a little less restrictive than the exhaust ports. how would having a restriction create a pressure drop. buildup of air would only create a pressure increase right?? nothing about that makes sense. the exhaust should come straight out for maximum flow! heat and small port/runner volume creates velocity but i dont want to make the volume bigger. if i could do this experiment on some heads, maybe i would just port the exhaust as normally done (or.. relocation between the rocker studs and close to the springs, maybe even carve out some material around the valve guides) and then do a relocation experiment on the intake to straighten the short turn.

update. i know this idea is getting crazier, but.... the damn valve guides are right in the way. thats why the ports are the way they are, so the springs and valves can get in their and do their job. but to get rid of this problem, why not elevate the whole valve/cam rocker system about 4-5 inches taller. an extension. it would probably require a whole new structure on top of the head to support and give rigidity to the rocker studs, pushrods, valves stems etc. i know im a lunatic but its all in theory anyway. now the exhaust has a much wider turn and flow numbers are only limited by the quality of the valve job and the intake.

thanks for reading.

 

Study up on venturi affect, good video on Youtube.

 

i already have, i dont get why the pressure decreases when it enters the smaller space. it actually makes no sense at all. it should increase becase its being pushed through a tight squeeze. its restricted. that causes pressure buildup. even if not a straight venturi is better than an immediate right angle. it couldnt be more restricted.

 

The reason is that as velocity of the air/fluid increases to compensate for the decreased area it "spaces" out the molecules, this in term creates a lower absolute pressure at that point. you will also find that right after the narrowest point is the lowest pressure because of the rapid expanse of gas/fluid.