My Type 1 turbo circuit racer (update pg43)

[4agedub]

Can you say close ratio gearbox...

First gear's ratio is around the same as a std beetle 2nd gear ratio. Each gear change gives a + - 1000rpm drop. Joe (Volkspares) built me one mean tranny.

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[4agedub]

Here's a datalog around zwartkops. Coming out of turn 2, through 3 into turn 4.
Turn 2, 1st gear. Just after turn 3 4th gear.

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[Tony Z]

those gears are pretty close...
Were you not going to be running FI???

[4agedub]

I really tried to convince the committee to allow me run fuel injection. After numerous letters and a + - 100 page folder showing that fuel injection was available for beetle's from the factory, they decided that it would not be allowed. So then my next option is 48ida's, which I've already got

TonyZ I've still not ported my 044 heads... how big do you think I should go with the intake ports?? Also how did you make all your ports equal when grinding them open??

[Tony Z]

I would say you need to make them pretty big, but not so big that you need to weld the CB 044s.
Make a cardboard template with only one port cut-out of it and use that to mark the shape of the inlet port. --- this is in the same place as the manifold gasket.
Then as you port, make sure you do the things one step at a time. Then do that step to each cylinder before doing the next step. Be warned, this will take you a lot longer than you first think. Keep keeping all the ports looking the same. then when you are done, put the valves in with a little vaseline and measure the cc of the port. Make them all pretty much the same and try to find the differences between them as you go.
I'll look for a pic of my port shape - it turns out to be very similar to the wedge port shape, just a tiny bit smaller.

[Tony Z]

on this thread http://www.aircooledvwsa.co.za/viewtopi ... 23&t=14775
you will find this pic


I used a 1mm thick piece of cardboard from the back of a writing pad. I then copied a stock steel manifold gasket onto it and cut it out so that the bolt holes fit perfectly and cut one stock port hole into it. Then marked out the shape I wanted the port to look like and cut the cardboard accordingly. Then trace that shape onto the head. If it look right, use it, if not, then re-shape.
Remember that to straighten the port, you need to move it closer to the bolt holes and dont touch the dimple at the bottom - thats the spring land.

Good luck and keep pics coming

[4agedub]

Thanks Tony. I'll upload pics as I progress.

[4agedub]

I'm resurrecting an old thread here

So after five years of historic racing I've decided to change back to turbo and go race in another series.... maybe silver cup or super saloons. Over the past year I've collected some parts for this build and hope to have it running by Feb 2014.

Here's some pics of the engine build so far:

CB Performance 78.4mm cromoloy crankshaft with straight cut cam gears and H-beam connecting rods

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[4agedub]

Auto linea ally engine case machined for 94mm barrels

[flatfourfan]

how come you decided to change race series? I was always enjoyed watching your cabby in the historic series.

[4agedub]

CB 044 Super pro cnc ported cylinder heads

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[4agedub]

how come you decided to change race series? I was always enjoyed watching your cabby in the historic series.

My dad's car will still be racing historics next year. But both our cars will be outlawed from 2015 with the new engine capacity rules. The new rules say engine capacity may only be increased by 15%. Which means 1817cc max.

[splitfan]

This is gonna be a beast ! keep the pics coming

[4agedub]

Yesterday we assembled the engine to this point. There's a lot of measuring and engineering involved with a build like this.
This is the first engine that I'm using 10mm cylinder head studs and copper rings in the heads... so that added up to the build time as well.

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[4agedub]

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Pauter 1.4:1 roller rockers installed

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