d16z6/d15b vtec IM development pt.7

the finished product , final texture achieved , runner entry shaped and contoured
the dividers are more profiled 

overall target here is :

making the convoluted non high performance OEM dseries manifold (p08) casting
to be more efficient  in air delivery, with an attempt at trying to equalize air distribution
ultimately improving engine performance and with the right tuning , even fuel efficiency

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to compare, this is definitely not on par with  a specific aftermarket manifold
like the skunk2/blox IM's  which is preceded by the edelbrock performerX performance wise

but this is a good solution to those that need to race "stock" 
or to maintain that "stock" look  when needed :)

even a stock engine with just this portwork/mod on the intake
and ecu tuning will give a pleasant improvement in performance and fuel efficiency

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this is now tig welded shut  and the brake master vacuum source (broken press fit)
is now replaced with a 3/8 NPT 90deg fitting  for that clean finish

d16z6/d15b vtec IM development pt.6

further work done  and smoothing etc 

notice the divider is alot more profiled  , and has now reached its final shape

-runner entry is flaired and now alot bigger than its stock previous  state

-the runner about an inch  into it is also slightly increased in size
 to give that slight taper along the total length of the runner itself
 to improve the charge momentum

* typo on pt2 , identified as runner3  is actually runner 2 :)

d16z6/d15b vtec IM development pt.5

a different angle  depicting the work on the plenum, runner entry and divider

- this stage  shows a lil' more smoothing done to the plenum

- runner entry more flaired and textured

- divider is more streamlined/profiled

d16z6/d15b vtec IM development pt.4

here is a picture  from the throttle flange side viewing the plenum and runner entry

-runner entry has taken shape after initial rough work and smoothing

-the dividers inbetween the runner entries are now more profiled

-total work would lead to a slight plenum volume increase, which is welcomed
  for a slight improvement on top end breathing 

*remember  the purpose of the plenum (even its meaning) is much like a reservoir
or an air tank/chamber  where  the intake tract's rush of inlet  gets to slow down
 expand  with an attempt at having "supply" per runner action

d16z6/d15b vtec IM development pt.3

here's an inverted shot, which shows the entry a lil' better than the previous picture

including the stock untouched yed "number2" runner :)

and the initial stage of runner entry enlargement

d16z6/d15b vtec IM development pt.2

Here's a shot of the porting (initial shaping) in its rough stage

we intended to leave the number3 runner to be ported last
so our keen viewers could see some sort of before and after in this pic

- runner entry ported to give a bit of flair

-runners slightly enlarged to give it a mild taper  to the flange outlet

d16z6/d15b vtec IM development pt.1

the d16z6 / JDM d15b / ESI (local to the phils) manifold  has some long runners swooping upward to the plenum , since the platform is mostly a commuter effort
and OEM , low rpm driveability prolly was the main concern

downside is, it is quite convoluted as far as flow goes  especially when the engine set up is hotter than stock,

here we do the ff :

cut open the plenum , to be able to port the runners, and slightly flair up the entry
for improved flow , porting the runners from the flange side
and tig welding the plenum shut

picture above :  is of the bare plenum surface and runner entry surface