Audi A4 BTCC / STW engine specs - 305 bhp from an N/A valver.

Cams...

Inlet: 14mm lift
Exhaust: 13.5mm lift
Inter-cam verniers
Tooth drive (standard chain dispensed with)
Spring caps to take 6mm valve stems (7mm is standard)
Narrow lobes?

 

I just gave back a VW motorsport 16v head to Vagobonds. Nice clean porting, with awesome angle work on the short side radius'
The most interesting thing is that it had bee cast without the main oil return at the from of the head, and the casting marks underneath were different too although I hadn't had chance to have a look for more comparisons sorry.
I know it was a VW motorsport head, as it was bought direct from their stand at TRL gti inters years ago, but didn't come with cam caps. Ooops!

 

And ya dident take photos

 

Na, had it sitting about for ages lol, looked at it so often I didn't think about it
I'll see what i can do in the next few weeks

 

Fantastic thanks

 

do you mean, the head was skimmed at an angle?

Is it me being thick?

 

Believed to be - DTM V8 head here, same principle:

 

Yep, raises intake port angle, and also aids to de-shroud exhaust valve when fully open against bore wall

 

this sounds interesting

anymore info i have a spare 16v ABF 051 head which needs to work, its never been skimmed etc.

 

What Info do you want?
I had a drawing done up last nite showing how the angle skim makes such a difference but the power went off half way through so I just went to bed in disgust.
Ill have another shot later!!

 

thats a new one on me!

would it really make much of a difference?? I suppose if they did it must have made some difference.

 

Vizard used to do it to minis

 

Can it be done without resorting to re-machining the inlet and exhaust manifold faces?

 

Inlet, no need, exhaust may need a skim as it would effect downpipe angle?

 

Probably easier (cheaper) to re-machine the exhaust side of the head a touch than making a new manifold (to compensate for the angle)?

 

Or would it be possible to re-machine the mounting face of the downpipe?

 

just weighed a wedged 9A crank and it was 12.5kg

 

Whatever is machined, either head or manifold, it would be no harm to counter bore the area under nuts at same angle too.

 

Couple of pics to keep things ticking along

 

i saw these things at brands hatch in their first season as 4WD sounded absolutely mind blowing!! put the rest of the field to shame! ..hence the subsequent rule changes booo....