Bigger intake manifold question

[Perry]

Hey guys sorry for the noob question,

Whats the main purpose of using a bigger intake manifold example comparing these 2





thanks
Perry

[M a i k e r u]

i would also like to know as well. ehehe

[BlackDC5R]

They are particularly beneficial for high rev'n Type-R's top end.

High rpm power needs short runners and a large plenum.

This is like a surge tank for fuel.

When revving hard, there is a very high frequency of air traveling into the engine, so it needs to:

a. get there as quickly as possible and,

b. there needs to be sufficient volume in the plenum (reservoir) to keep up with this demand.

The trade off of the short runner and large plenum is low and mid range torque, where longer runners provide the air with more velocity to fill the combustion chamber.

So with this setup pictured above, the engine will be very "peaky"


hope this helps

[BlackDC5R]

you will also note that the second picture is for forced induction, obvious by the Sard rising rate fuel pressure regulator, so forced air will be fed into the plenum, where as the top picture is for a NA application.

[fatboyz39]

you will also note that the second picture is for forced induction, obvious by the Sard rising rate fuel pressure regulator, so forced air will be fed into the plenum, where as the top picture is for a NA application.

Both manifold can be used for N/A application.

[tinkerbell]

you will also note that the second picture is for forced induction, obvious by the Sard rising rate fuel pressure regulator, so forced air will be fed into the plenum, where as the top picture is for a NA application.

WTF? you cant tell from that picture if the Sard regulator is rising rate or linear...



BTW - both manifolds can be used for NA...

also - the CF one probably doesnt exist in reality (ie - you couldnt buy it)

[Jingers]

you can, thats why he posed the question tinkerbell LOL.

I also know certin Manifold designs promote response

[tinkerbell]

you can buy it? where?

[Jingers]

toda adrian currently have a used one.

[tinkerbell]

well i'd be interested in the price - they were $1225 US retail...

the JG is certainly better value for money....

[Wlee2]

I have to ask.. umm

what makes a manifold right for NA vs FI?

cant you use NA intake Manifolds on FI purposes as well? or is there a reason you cant?

[tinkerbell]

details of the CF manifold are here:

http://www.advancedinductionresearch.com/fd1201-20.htm

JG "Victor X" one here:

http://www.edelbrock.com/sportcompac...ani_vict.shtml

also JG "Performer X":

http://www.edelbrock.com/sportcompac...ani_perf.shtml

[tinkerbell]

I have to ask.. umm

what makes a manifold right for NA vs FI?

cant you use NA intake Manifolds on FI purposes as well? or is there a reason you cant?

no reason on a non-race street car...

[Jingers]

well i'd be interested in the price - they were $1225 US retail...

the JG is certainly better value for money....

i think somewhere within the vicinity of $1000 was discussed

[TOU93]

i know JUN make a intake manafold, but its almost the same price as ITBs

http://www.junauto.co.jp/products/in.../index.html?en