Jeremy:

[TheSean]

Why would one prefer square intake ports over round?

Whats the cost diff?

How often do you buy new socks?

How much does your carb/intake flow?

Id prefer if you responded to each Q with a seperate post. Thx :)

[HORSEpower]

Square ports generally give you more power, because of the larger cross-section. In order to get more cross-section out of a circular port, the total dimensions have to be greater. Most high performance heads are square port, so there really isn't anyway to make a price destinction. The carb flows 750 cfm. I have no idea on the socks.

Sorry for answering for Jeremy, I couldn't resist.

Kurt

[jeremy]

Why would one prefer square intake ports over round?

I prefer round intake ports, the circle is nature's perfect shape. Also, it has been shown through numerous CFD modeling programs that round orifices create much less turbulance and offer higher flow rates per unit area.

Also, when you're in a jam they're easier to use as beer bongs.

[jeremy]

Whats the cost diff?

Well a regular beer bong made from a simple funnel and plastic hose will set you back about $10. If; however, you decide to use the round port intake to chug your brew you'll probably be looking at throwing down about 2.5 benjamins. And then of course there's the question of billet or cast. I personally perfer billet, because the beer tends to come out less foamy. Be ready to cough up another 3bills for the billet.

[jeremy]

How often do you buy new socks?


Every other 3rd day on the even months of a leap year in which we experience both a solar and lunar eclipse in the same week.

[jeremy]

How much does your carb/intake flow?


This really depends on the test standards you would call for. For example, the carb flows about 5000 cfm at 600* Kelvin and 5.6x10^-6 inches of water. The intake would be around 20,000cfm for those same conditions.

[jeremy]

Why do you ask?

[jeremy]

Did you know that when calculating the time constant for the discharge rate of a micro capacitor the the varible grouping 'RC', which is measured in Ohms and Amps respectively, when multiplied out converts to seconds? I found this to be quite interesting.

[TheSean]

Why do you ask?

eh, i was just wondering

[TheSean]

I prefer round intake ports, the circle is nature's perfect shape. Also, it has been shown through numerous CFD modeling programs that round orifices create much less turbulance and offer higher flow rates per unit area.

Also, when you're in a jam they're easier to use as beer bongs.

so turbulence isnt good huh?

i prefer round orifices, too.

now, pertaining to engines, i dunno, i guess round is better. Ill have to do some modeling.

[TheSean]

Well a regular beer bong made from a simple funnel and plastic hose will set you back about $10. If; however, you decide to use the round port intake to chug your brew you'll probably be looking at throwing down about 2.5 benjamins. And then of course there's the question of billet or cast. I personally perfer billet, because the beer tends to come out less foamy. Be ready to cough up another 3bills for the billet.

id def say the billet was worth it. you get the bling factor on top f being smoother and more consistent. We all know casting flash makes the beer taste funny. :rant:

[TheSean]

Every other 3rd day on the even months of a leap year in which we experience both a solar and lunar eclipse in the same week.

i just buy when i need new ones. it's a lot simpler that way. Plus, i dont think you can have to eclipii in one week, something about the whole revolution/rotation thing. go ask dr fleck, he'd know. I dont care. :)

[TheSean]

Did you know that when calculating the time constant for the discharge rate of a micro capacitor the the varible grouping 'RC', which is measured in Ohms and Amps respectively, when multiplied out converts to seconds? I found this to be quite interesting.

youre in physics 3 already?

[TheSean]

This really depends on the test standards you would call for. For example, the carb flows about 5000 cfm at 600* Kelvin and 5.6x10^-6 inches of water. The intake would be around 20,000cfm for those same conditions.

as per the generlly accepted standards set by the NIST/ASME, when pretaining to "flow" you are taking into account a predetermined set of preset parameters. Same deal with the whole valve lift advertised/actual thingy. I dont know if the SAE was in on the flow thing, probably because it's carbs yes. Just go with the same measurements, and if you cant find em, just use STP? aparently youve been through physics 2 :D

[jeremy]

eh, i was just wondering

Well, now you know. And knowing is half the battle.

[jeremy]

so turbulence isnt good huh?

i prefer round orifices, too.

now, pertaining to engines, i dunno, i guess round is better. Ill have to do some modeling.

Turbulence is bad. Round orifices are good. And 1+sqrt(-4) is greater then 2i.

[jeremy]

id def say the billet was worth it. you get the bling factor on top f being smoother and more consistent. We all know casting flash makes the beer taste funny. :rant:

Not only that, but if it's a bad casting and a particularly acidic beer you run the possibility of consuming hazardous metal shavings. I generally like to stay away from doing that. It keeps the mini Christina Agulara trolls at bay.

[jeremy]

i just buy when i need new ones. it's a lot simpler that way. Plus, i dont think you can have to eclipii in one week, something about the whole revolution/rotation thing. go ask dr fleck, he'd know. I dont care. :)

Well, you forget that about every 500,000 years the moon comes into range of the worm hole that causes it to instantly transport to the oppisite side of the earth whereby it can then cause the dual eclipii within the stance of one weeks time. This can also be noted by the sudden shift in tides and vaporization of the ice caps.

I think Sears has a sale on that day also.

[jeremy]

youre in physics 3 already?

No. Just PS ln(e^125) * d/dx(2x)

[jeremy]

as per the generlly accepted standards set by the NIST/ASME, when pretaining to "flow" you are taking into account a predetermined set of preset parameters. Same deal with the whole valve lift advertised/actual thingy. I dont know if the SAE was in on the flow thing, probably because it's carbs yes. Just go with the same measurements, and if you cant find em, just use STP? aparently youve been through physics 2 :D

My carb isn't flowed at STP. It's flowed at some undetermined temperature and 1.5" of H2O whereby resulting in the documented 750cfm. It should also be noted; however, that the 1150cfm model has the exact same dimensions as mine with the exception of the straight cut (annular) booster rather then my umbrella boosters. So in theory with the simple use of a dremel and a plotting program I can arrange to have anywhere from 750 to 1150 cfm. The intake is generally accepted to flow as high as 3000cfm.

[Cracker Red]

If round ports are so good, how come the pro stock heads that I have seen all have square ports, as do the manifolds that feed them? Air follows the short turn, and with round ports, they have to be much larger to have a greater surface area in the short turn part of the port. Square ports don't have this problem...

[jeremy]

If round ports are so good, how come the pro stock heads that I have seen all have square ports, as do the manifolds that feed them? Air follows the short turn, and with round ports, they have to be much larger to have a greater surface area in the short turn part of the port. Square ports don't have this problem...

Real intakes dont have "turns". Round ports create significatly higher intake velocities. This causes greater induction pressures into the cylinder.

http://hotrod.com/techarticles/p105992_image_large.jpg
http://hotrod.com/techarticles/p105996_image_large.jpg
http://hotrod.com/techarticles/p106000_image_large.jpg
http://mustang50magazine.com/featuredvehicles/p76480_image_large.jpg
http://mustang50magazine.com/featuredvehicles/p76478_image_large.jpg
http://www.tigersunited.com/techtips/MatticeStroker/Mattice6.jpg

[Cracker Red]

those sure are some nice hilborn type injection setups....none of which race in pro stock :) I suppose the cylinder heads don't count as the ports...

Also why most big block ford guys buy heads cast with chevy type exhaust ports...as they arn't round, they are D shaped, which is as good as square as far as the airflow is concerned, because it takes the short turn.

[Brazen6.0]

each cylinder head reach a certain velocity/flow to wich it can't go past. Oval port heads are usually found to work nicely on a street motor with less than 500ci and not peaking past 6500...anything above and you need a bigger runner, which will slow down your velocity, and reducing torque down low. On a 500+ci, you already have plenty of low end, and pro stock type motors can care less about tq at 3500rpm!...thus they all use big square ports

[Cracker Red]

maybe, I should have included flat radiused type ports. All that really matters (IMHO) is the surface area of the short turn, as well as the littleist "turn" possible. I suppose Honda heads that have a flat oval type port flow quite well for thier size. Even in the hilborn style injection pics above, there is still a turn before it gets to the valve, where, it ends up haveing a flat floor.

[TheSean]

well shit, if honda uses it, it must be the best!!!

lets all go convert to square oval ports!!!


no wait, thats for 4 valve setups :p

[Cracker Red]

I brought up the honda heads, as they flow pretty damn well from the factory, and even better once ported. How can you argue with an powerplant that puts out quite a bit of hp/l ??

why don't you go back to fixing your "900hp, 9second" vr4 ;)