i just purchased a sick rmf header, and got a custom exhaust installed. to complete my i/h/e setup i am looking toward the edelbrock performer x intake manifold. my only concern is that it says on edelbrocks website that is bolts up with a 65 mm throttle body. i have a 68 mm throttle body. does this mean that i would need to get the manifold bored/honed out to 68 mm? thanks for the help.

 

Yes if you stick with the 68mm TB then you will need to port match the manifold with the TB.

 

Yes/no, you can use it together, but the TB opening will be 65mm and the lip will kill incoming air velocity. 68mm is awfully big for a NA setup anyway....unless ofcourse you're gonna hit 300whp.

 

If you want optimal performance from the 68mm then yes.

 

i was under the impression that the bigger the TB the better. correct me if im wrong. could any machine shop bore the intake manifold out for me? or should i send it to a specific place? OR should i just get a 65 mm TB? sorry for all the questions....still learning this all motor stuff.

 

You're wrong.

 

you missed the part where he said "correct me if"

 

You need the correct size for your engine setup. The basic run down is that for a smaller TB to move the same amount of air the air has to be moving at a higher velocity, which then "rams" the air into the engine (very good). If you get too large of a TB, air velocity slows down and you lose that "ramming" effect. There are limits to this though which is where proper TB sizing comes into play. As with all things, resistance becomes higher as air moves faster, thus you can't throw a 25mm TB on and call it a day because the air resistance becomes to great and you limit yourself. Thus, there is some fancy formula that explains all this and finds the optimal point bewteen air resistance and velocity, but the hell if I can explain it. Basically 68mm is too large for "most" NA setups. It also helps to create a lip on the inside of the TB (like having a 62mm TB on a 65mm IM) because it "traps" the air in and doesnt let it reverse out of the IM (anti-reversion is the tech term if you care to research it some more).

 

i had no idea. thanks for the input. after surfing this board for almost 3 years it never ceases to amaze me that people with almost 10,000 post are no help at all.

here's a rundown of my setup:
b18 bottom end
grs top end
ls crank
itr cams
b16 pistons
rmf header
custom 2.5" ss mand. bent exhaust
stock intake mani(see original post)

what do you think the optimal intake size, tb size would be? would my setup work well with the performer x intake manifold? or is there a better option?

 

I missed the part where I gave a ****.

 

You've surfed this board for 3 years and have managed to have missed something that's covered in basic high performance all motor performance 101. That's your fault and not mine. For my remaining 47 post's I am going to be no help to anyone.

If anyone wants to talk to me or ask me anything, PM me or send me an email. Or I can tell you guys of a better site with a member base that actually has an average IQ which is above that of tumbleweed. Or the management here might ban me before I get 10k posts just for mentioning it. Big brother, or older grandfather, is watching.

 

then WHY did you bother posting? boredom? seriously man.

if you want to pout and bail out, dont let the door hit your *** on the way out. there is a wealth of knowledge up there in the search that makes your comments obsolete.

ill tell you where you, your boy rocket and your daddy don flores are messing up. when someone posts a thread that says "yo yo whuddup dawg, im tryin to put a H22 head on my D series and i need to know if B series headgasket will work??" those are the guys you flame off the face of the earth or just click the back button.

but when average joe asks a question and is well versed enough to make the question specific enough to garner a pinpoint answer, you answer it if you know it and move on. you, don and robert seem to not have a character judgment skill.

on top of that you could have told him about rocket cams or offered to TB match his manifold for him via CCcylinder heads, via PM of course, but rather you chose to show us exactly what day of the month your PMS occurs. good job, betty.

bye.

 

Do you feel better now?

Your novel of a post isnt going to change my mind, so why do YOU bother posting?

bye.

 

all you have shown in this thread then is

1. youre not going to help anyone
2. you dont give a ****

so ill assume youre part of some bandwidth wasting agency?

 

Correct. The agency's name is "Honda-Tech".

 

 

rumor is that manifold is one of the best street all motor manifold but back to your question,the only really way to get results is through dyno testing.of course many will a play a role such as ambient air temp,humidity you get my drift.

 

thanks for some of the input. now im curious about TB sizing. anyone care to hed some light? except you combustion...your a shi* fuc* and i really wish you'd crawl under a rock. so anyone who ACTUALLY CARES TO HELP SOMEONE LEARN SOMETHING please chime in.

 

http://www.team-integra.net/sections...?ArticleID=466

Read both pages, theres info about manifold designs and ITB sizing.

 

DC Legacy with the common sense approach

 

again, no help. what an ***.

 

Dont worry. Only 36 more posts to contend with after this one, you single celled pile of ****. I will become increasingly hostile and "out of character" until then.

 

lol

 

Hey Jeff. Tell 'em Im not such a bad guy. I'm pretty nice and I try to be helpful, but some people...

 

you cant make every one happy