Porsche Museum Helmut Pfeifhofer.DS71 napisal/-a:kaj o Formel VW-super vee
VW 2 litre 16V cylinder head. (Engine code, 6A)
RED=Cut Faces.
YELLOW=Exhaust Ports.
GREEN=Intake Ports.
NAVY=Waterways.
ALLOY=Original Casting Open To Air.
One thing to note this was a test head, the injector cut outs and valve guide bosses have been smoothed, 3 intake ports were polished, THERE WAS NO METAL GROUND FROM ORIGINAL PORT WALLS, just polished.
In the mean time ill let the pictures do the talking,
enjoy
B.G)
Just getting the maximum porting dimensions together now, im going to try and make as simple as possible to understand so people can compare/go off these measurements if someone wants to take their head to the max and is afraid theyll hit a water/oil way.
Im going to present the measurement diagrams in 3d if you like, and show you how to make a simple datum point frame that can be fitted to a standard port(s) to take these measurements off so you can mimic them perfectly, or should i say use them to see how far you can go.
Ill leave a safety margin on them to allow minium port wall thickness of say 2.5mm(in spots) or so, i have to compare all the port wall thickness in a load of places first in order to get an average casting thickness, find the average and danger areas, and add a few mm for a safety zone.
I may even post 2 sets of dimensions, safe maximum dimensions for the experienced porter, and another set for the guys that like danger and want the MAXIMUM at all costs even if it means going near the borderlines.
Ill present the port diagrams in MS paint.
When i have time im going to run all these ''possible maximum'' port dimensions on my engine simulator(optimum port shape of course) package and see just what this head is theoretically able to flow.
Should be interesting even if it is simulated.
I forgot to point out that some of the cuts above arent at 90 degrees to each other, some had to be cut at 85degress in order to take in all i wanted intto account and at the same time avoid the valve seats and other stuff as i dident want to risk damaging my 400mm tct alloy blade doing it ££££££££££££££££.
Done for the future reference of all engine gurus worldwide.
Should answer all questions in respect to how far out the 2.0l block can be taken to.
Here we go now, enjoy!
Engine code 6A.
Green surfaces are VW factory faces, red surfaces are my own cut surface ground faces.
And the all important measurements>
Bore 82.50mm
Stroke 92.80mm
Average wall thickness of block through out(non high load areas)> 6.00mm.
Distance between bores taken with a high quality vernier callipers> 5.72mm.
Average main oil way gallery's diameter> 12.30mm.
Oil feed to head, average diameter> 5.60mm.
Minimum bore thickness> 4.44mm, max 7.80mm.
Average deck thickness, pretty uniform throughout>minimum measurement> 16.00mm
Bridge piece across water passage at number 1 and 4 cylinder> 10mm wide x 17mm high.
Block featured is a standard bore 2.0L 16v 6A external water pump forged crank(this had one?) type block with approx 150k miles.
I hope these pictures and specs help everyone who is thinking of or in the process of building a great engine.
I also hope these pictures will put peoples minds at ease with any doubts they may be having when it comes to boring these babies out or planing the deck, tapping oilways for remote supplies, dry sumping,etc.
Points to note are>
The bridge across water passage which is not in the 1.8T block as seen in the turbocharged section.
The mould bridge stabiliser seen between the 2 cylinders, fitted at time of casting to aid stability to cores im sure.
The general beefiness of the entire block compared to the AUG 1.8T.
I stand by all of the above measurements.
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