1.6L Type1 Road Race contender : pt8

finished 113 fully ported heads  (pending machine works , cleaning and such)
dont mind the messy/dirty mock up bench hehehe

here's the planned specification of the engine / project

1600cc = 85.5x69

Heads    - 113 vw casting (1302/1303) heads, fully ported etc
Valves   - 35.5mm intake valves , 32mm exhaust valves  stock replacements by TRW
Springs  - scat/bugpack single HD springs, shimmed 0.060" bfor bind , chromo retainers and keepers
Rockers - stock 1.1:1  rocker shafts on CBperformance solidshaft kit and Porsche 911 style adjusters

P/C       - 85.5mm AAperformance Piston and Cylinder set
Rods     -311b german reconditioned stock rods (resized big ends and rebushed small end) , balanced set
Crank   - 69mm CBperformance Forged 4140 chromoly  ,
Carb     - Solex 34-pict3 as per Kafercup rules , 34-3 center section and VW endcastings
Header -  1 1/2 merged header w/ single straight thru muffler
Cooling - 181 doghouse fanshroud , complete german tins and undersled (industrial tins)

case     -   AS41 dual relief case, drilled and tapped / plugged for full flow
                internal case work done to improve efficiency and lessen windage loss
              
camshaft -    this is still in the planning stage
                   choices from engle W100 , W110 , Web #119
                  and other custom profiles being discussed

target compression :         8.9:1 static
rev range               :    5800-6000rpm Max
fuel                        :       91-92oct pumpgas

1.6L Type1 Road Race contender : pt7

First 2 pics are random shots of the intake ports from different angles
3rd pic is a closer shot of them  with better lighting

1.6L Type1 Road Race contender : pt6

the intake ports  with some lighting to depict the overall shape and contours done to it
this is its finished state  
pending work :

-some chamber work and clean up (minimal material removal as it is hard to gain compression with 1.6L)
-flycutting the chambers to achieve the desired compression (static compression)
-3 angle seat cut  w/ the intake having a 4th cut in the chamber to deshroud a bit
   and the exhaust having a more of a wide cut on the top to aid in exhaust exit around the exh. valve

1.6L Type1 Road Race contender : pt5

here's the exhaust ports : not much work is needed here as the Type1 heads tend to be generous here

-Just minor clean up and shaping , via sanding rolls and some carbides and smoothing the transition
-notice the casting flaws/lines are still a little visible because the exhaust port hasnt been totally hogged out
-no secret or nothing special here,  improving the induction side of the engine  helps alot
 but wat you put IN needs to get OUT ... as far as the engine being a metaphorical "air pump"

1.6L Type1 Road Race contender : pt4

Two shots of the intake port from the Chamber side  with some good lighting to show its new shape/contour

As we can see , the main work on this section of the port is to carefully transition the port into the throat
to help flow (air and fuel mix) across/pass through  the 3 angle seat cut and around the valves

generally when done right and coupled with a performance oriented valve job (3 angle seat cut) we can improve flow across the board and in turn, improve performance and efficiency too!

1.6L Type1 Road Race contender : pt3

                                           here's an intricate shot of the left side intake ports
shaped nice and conservatively ported as we like it for smaller displacement motors that oft' need to be able
to pull torque early in their powerband , be more efficient and not choke itself in the mid-upper rpm as much

1.6L Type1 Road Race contender : pt2

two shots with slightly tweaked angles , to show the work done and how the shape has turned out

notice the inner side of the ports still show some of the casting flaws, some areas we just dont need to enlarge or remove material from

the throat area is worked on and shaped accordingly , to aid the air/fuel mixture into the seats (3 angle cut)
and around the valve

1.6L type1 Road Race contender (Kafercup and Retro-race) pt1

Here's a shot of the heads we're working on , its a 113 casting that comes from the super beetles (1302/1303) significant difference it has vs its 040 counterpart and the 311 (type3) casting
is the lack of guide boss inside the intake ports (seen in the pic) 

Since it is known that a 35.5mm intake and 32mm exhaust  is very much capable of generating 125hp conservatively  , and by math using the CSA available of the said intake Valve size + 89-90% throat ratio
it is capable of 135hp  , we know  we dont need a bigger valve for this project 
which would help us keep velocity high for better torque spread

development work/target is as follows :
-clean up the casting flaws, smooth and radius the ports to improve velocity and flow
-achieve the above mentioned, without enlarging the ports too much and increasing port volume
  the lack of displacement at 1585cc would not need such big ports , which could cause a lazy powerband