Okay, so ive been debating on what to do for awhile, and decided id post some pictures and get ur opinion...

Basically im gonna gut it out, and take out the spacer plate.


This is what it will look like w/o the spacer.


Where it is red im gonna finnish it up, knife edge the tops between the cylinders, and then match the top half to it.



or should i just do somin like this?




Modified by 93h22a1vtec at 12:24 PM 2/8/2007

 

I LIKE OPTION 2

 

Doing the same with my manifold , but i'm stacking 2 plates and gutting the rest out. For a turbo motor.

I'll post some pics when done.

 

bigger plenum = good for boost bad for NA correct?

i think im gonna dyno mine with and w/o the spacer and see what works better

 

https://honda-tech.com/zerothread/1837017

Great info in their

 

yes, lose some bottom end torque, make up for it in the top end.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H22_TURBO &raquo;</TD></TR><TR><TD CLASS="quote">yes, lose some bottom end torque, make up for it in the top end.</TD></TR></TABLE>

Yes bigger plenum and bigger runners. With a turbo your trying to get as much volume into the cylinder as possible.

 

im goin NA

 

bump... do you think i will see sufficient gains by doing what i plan?

 

What else do you have done to the motor? Doing what your planing is gonna hurt you more than help you if you dont have an agressive head or bottom build.

 

stage 3 crower cams, port polish, oversized valves, 11.5 compression, 89mm bore, exc exc.

 

 

bump

 

I wouldnt take the runner divider walls to a sharp edge..Leave them alone

 

y is that? Should i round them

 

yes..but geez man is that first wall that thin already?? Or is that just the picture

 

its thin... what is bad about having a sharp edge?

 

Well Im not gonna criticize your work cause your just learning.
I don't know how many times I can stress this fact .."Air HATES to be divided". It loves to choose which way it wants to go. Manifold porting is just line of sight porting. Like on single plane manifolds u just wanna take material out of the inner wall and maintain a consistent cross section or have a little taper.

 

hmmm so i though a large plenum was bad for NA ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kornerk12 &raquo;</TD></TR><TR><TD CLASS="quote">hmmm so i though a large plenum was bad for NA ? </TD></TR></TABLE>

B. General Rules For IM Designs and Complementary Parts

1. If you increase the plenum size (volume), the powerband is shifted up to a higher rpm.

2. Smaller plenums have lower to midrange rpm powerbands.

3. Large plenums prefer smaller diameter TB's and runners to maintain air flow velocity.

4. Small plenums prefer larger diameter TB's and runners to obtain more air flow capacity or air flow volume.

5. Tuning the runner length achieves the best air flow velocity for the powerband location you want.

a) Longer runners have, on the plus side, more flow velocity which shifts the powerband gains to a lower rpm and has less reversion than shorter runners.... but on the downside, longer runners have less air flow capacity.

b) If you need more air (capacity) to get into the engine , you must increase runner diameter .

c) If you want a higher powerband location , you shorten the runner length.

 

yup leave them radiused, air will flow out of the runners next to them on its way to the cylinder "charge robbing" and it won't like going over the sharp edges.