B16a cylinderhead development pt4

a better shot of the intake port (slightly lower camera)

in turn  ,  this  shows a bit more of the short side radii 

and bowl work 

-notice the overall throat's transition to the seat

B16a cylinderhead development pt3

here we show  the current work done to it

bowl work and throat work has been done
and a bit of short side radii  transitioning  also

critical area to work on where  one can make a mistake  in reworking
and suffer power gains  on the top end  or torque  down the midrange

B16a cylinderhead development pt2

here's  the shot of the intake ports in its  stock bare casting form

picture is for reference  with the finished work as we take pictures during the whole progress of the work

B16a cylinderhead development pt1

here's  a picture of the bare head  after cleaning  with detergent and blow drying with compressed air ,  ready to go thru the dirty work of porting  :)

quick spec' of the work

b16a cylinder head  to recieve port work by us 
will run buddyclub 3  cams  

block will be a stock JDM b16a (p30 pistons)
P30 intake manifold  ported through out, with plenum work and reweld
typeR 4-1 header 

target is emphasized on producing torque early in the rpm band
to carry  power better  into vtec transition 

improved flow on the ported intake manifold should help boost peak power too

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