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

Idorap has pulled this picture across to the TB porn thread, clearly showing MTK on the bottom right of the slide throttle.

MTK popped up earlier this week, and an immediate link was made to both Audi 90 works engines here and also French Supertourisme engines, via the ex-Bernard Winderickx Mk3 Golf engine, now installed in Gaeton Hayot's Mk1 Berg Cup car (link at the bottom of the linked post in this para).

But seeing the BTCC motor above, it proves that early '90s Golf (late '80s maybe?) French Supertourisme TBs crept into (at least) the early stages of BTCC/STW

I think from looking at various pictures of the BTCC cars that the MTK version was either evolved or changed for another design or mfr as development progressed. I can't see the MTK markings on later Audi TBs... maybe it's at the right hand end?



... and I have a pic of one with a vertical throttle spindle, not a horizontal one... (marked '98)

(so that's 3 versions)

...but it's nice to see a confirmation of them on a BTCC/STW motor, because it means we're onto something.

On the topic of slide throttles, they have a finite diameter, because they have to be able to slide across between the cylinders at full opening. I am told this means they're about 44mm diameter max, way less that you'd expect for a motor of this staggering output, so take with a pinch of salt for now & it needs some measuring up to check.


It's not clear who MTK are, but they appear to be near Ingolstadt, and could well be a heavily used satellite engineering/engine firm, working on behalf of Audi Sport.



This page shows a French Supertourisme head, sump and so forth (captions confirm) but in the pictures to the top left, there are 2 Audi V8s in 2 photos. That gives a rough indication of era, if they are the racing Audi saloon V8s. MTK have also been linked with Treser, who I think did road Audi conversions, so it could be for that.

 

A little bit of history...

http://www.google.co.uk/imgres?imgu...&start=180&um=1&hl=en&sa=N&ndsp=20&tbs=isch:1

 

Some great images.

This is the ex-Stirling Moss replica, pictured here at Autosport in 2007/8, currently sitting in the Quattro Rooms:



It was built by 586 Sport Ltd, aka what was effectively / formerly SBG Sport.

 

Pics through from Idorap - 2 different engines.

We are now "cooking on gas"



I should point out it was HPR who showed me the MTK document at the weekend. One glance at it, and I recognised the logo, just from seeing it on the Berg Mk1.

 

This is the one I saw at the Berg Cup last year - vertical spindle, '98 markings in paint, but I missed the bit where the mfr names are appearing - doh!

 

Those pistons will be designed for use in either orientation (ie left or right bank). Hence the two sets of valve cutouts. I reckon.

 

found on the other end - same engine:

 

ID plate reads
NR 9711 K96/G 20 02 1997
Revision
nothing comes up in a google search

 

Could it have something to do with the heads mounting surface being machined to a different angle?

Again, I am not sure what the right words are in English... But I read that to use bigger valves and still use the original valve-centre-point, as per rules, the head had to be mounted under a different angle. So they just "cut" it to fit, redrilled the holes for the valves etc. and could fit bigger valves while still following the rules.

 

that sounds quite plausible.

 

Some mo!

 

"The cars are originally built at Audi Sport in Ingolstadt. The engines are built at Neckarsulm, in the oldest building on that site - a long hangar which dates back to pre-war days and NSU."

"Teams fielded... eight A4s from the AZK-ROC Franco-German alliance... two-car team in Italy - Audi Sport Italia, managed by former rally co-driver Emilio Radaelli."

Audi Sport UK Ltd... 2 cars.

Volkswagen Audi Car, Sept 1997

 

on the subject of block cooling heres a pic of a works quattro block(I believe) for comparison.





std block

 

Is this the alloy block?
It seems like it had liners fitted enhance the colour difference
The quattro group B had an alloy block to lighten the front end and get a better balance
I don't remember from when but I could

 

That's just awesome! It'd mean I don't have to worry about shutting some of the coolant ports on the head cause they will be connected somehow anyways!

It does look like the cilinderwalls are made of a different material. Any info on that?

If that's the case, it'd mean Audi didn't have to have a recast of the block in a different material, but "just insert" different / stronger cilinderwalls into the already existing bottom end!

 

Check out this thread: (Posts: #78, #79, #82, #83, #84)

http://www.clubgti.com/forum/showthread.php?t=220831

 

Some eye-watering stats on these pukka engines - Lehmann Supertouring prices (so gives a close idea):

Component|Swiss Francs (in 1998)|Sterling (in 1998)|Sterling (today) Engine block, (machined, bare)| CHF 7,175 |2,989|4,005 Cams (each)|CHF 780 |325|435 Crank|CHF 6,130 |2,554|3,422 Sump| CHF 2,338 |974|1,305 Slide throttles (MTK)| CHF 4,225 |1,760|2,358Quite staggering!

 

Also I've stumbled over a reference to a video called "The Return of the Four Rings", which is a 75 minuter made to commemorate the 1996 BTCC Campaign. Sold by Audi Merchandising back then, if anyone has a copy or has heard of it, let me know!

 

it does exist theres a guy on classic audi got it on his server,ive asked him for a link to it and

35,500+ veiws and not a sticky?

 

Was going through some pics of the heads I have here, and stumbled upon something I never really gave any thought. But decided to open this therad, and sheck for pics of the dist. side, and found this pic:

From this post: http://www.clubgti.com/forum/showpost.php?p=1690984&postcount=2

If there was any uncertainty about what head this was, check the black rubber plug thingy next to the cam-gear... you know, the one that says V8 on it.

Gonna go through all the other pics now to check them for little plugs.