intake manifold vs stock port and polish
 

i wanted some people views on which one they think would be better an intake manifold with shorter runners or with longer ? im looking to get one for my 95 civic and dont know which one to get one is a custom intake manfold that looks like the obx intake manifold a picture is attached below and the other is a stock manifold which has a longer runners but is ported and polished by gude i dont have pictures of the gude yet but will put up later

i would say the obx. arent our intake manifolds made of plastic? i got into an accident a while back i think i might have craked mine. im gonna check it out this weekend.

yeh the 7th gen are plastic but im talking about a 95 civic which isnt plastic.

attached is a picture of the stock port and polished manifold which one do people think would be better for performance ?

he said 95 civic.....

i would go with the port&polish

and here is a pic of the obx intake manifold

is it just me or does the first manifold look the same as the obx manifold ? the guy never said it was an obx, heres another view

what are the mods on the 95 ...cam, head work ect??
if none then i would say go with the ported original.
If a cam, cam gear, throttle body headwork ect are in the near future than i would say go with the aftermarke intake. But i would not trust obx to make a good manifold, i am thinking more along the lines of skunk2 or something. oh yeah they do look different.... not much of a difference in runner length.

Some quick info about intake manifolds:

Shorter runners (OBX) will allow the manifold to flow better. That means better top end power. Longer runners allow for more lower end power, due to something called "port tuning."

If you have adjustable cams, or can adjust your timing in other ways, the OBX will work great. If your car is stock, than the PnP'ed stock manifold would probably be better. If you install an OBX withough doing anything else, you'll probably lose low end torque / power......

thanks for all that info guys

I wish the KMS manifold for the 7th gens would actually produce power than
rob you of power!

Port and polish is the way to go.

dont worry, Catalyst is making a manifold for us 7th gens!

so the kms intake manifold for the 7thgen doesnt make any power ?
it actually makes you lose power ? has anyone dynoed it ?
can someone post a pic ?

some people say it takes away power, and others say it gives no gain...either way, not worth it. Catalyst is developing a new manifold which will have proven dyno gains.

ok tell me what you think here is my setup can the obx give me good bottom and top power if i tune my car right ? more than the stock port and polished intake manifold ?

i have a 95 civic hatchback with a jdm d15b 1.5 sohc vtec with a d16y8 port and polish head zex cam, stage 2 clutch,cold air intake, header,exhaust,cam gear and mugen ecu vtec ((4700 rpm limit 10,000)) gonna add some a dual core radiator, a 7lb flywheel and high compression pistons next week i already have them. i might have to get a d16block for pistons to work to raise the compression to from 9.6 to 13.0


lowered with tanabe springs and tokico shocks, 4 stabilizer bars and 15n inch si rims

what should be my next mod? nitrous ? i know i cant run turbo on such high compression but how about a supercharger ?

dh racing makes manifolds for 7th gen......if you don't want to wait for "development".....

Do you know when its post to be out?

so what should my next mod be ?

nitrous, turbo, and super are all forms of FI. i wouldnt run a supercharger on 13:1 compression.

yeh i know that they are all forms of fi but i heard that nitrous loves a high compression ration dont know how true this is

If you run it with real high octane fuel like race gas you might get a way with it...but your going to have to run serious fuel for 13.1 you can't run that on pump gas.

so i cant run 93 octane with retarded timing and proper tuning ?

I don't have the conversion chart infront of me, but im pretty sure your going to need to runhigher octane than 93 even with the retarted ignition timing...Find a compression/octane calculator on the web, it will tell you all the conversions. Personally i think it will knock

i heard from some guys who have experience and thye told me that i can run 13 compression with 93 octane and proper tuning and retarted timing because they did it already

go for it then

If you run 13:1 compression with the proper FUEL (race gas, or methanol) with advanced timing then you will make more power. If you run 13:1 compression and RETARD your timing...your defeating the purpose, they cancel each other out it's going to run like ass and not have full potential. but you are right you will be able to run pump gas on it.

You want to run your ignition timing as advanced as you can before you rattle the motor....advance...advance..advance..and then when it rattles, bring it back a little bit untill it stops rattling. then you have perfect timing.

IF YOU RUN HIGH COMPRESSION YOU NEED TO RUN HIGH OCTANE!
That's all there is too it...