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

agreed - I use cometic on my valver - thats too thin for my liking i'm afraid but yes, great pic Neal

 

Thanks for the pic Neal thats excellent, I have asked for some pic's of the block.

Here's another of the piston

 

Although I agree with the blocks being stripped down after each race, what you got to remember these engines are now over 13 years old, and now in the hands of the public who continue to race these engines and cars.

I'm pretty sure original blocks and heads are still being used, apparently Audi Sport offer no help to privateers still racing these motor's, hence when you buy a BTCC car you buy all the spares that go with it.

 

Found this on the p0rn thread, page 11 - later cam cover/poss other updates?

 

lightness i'd say

 

A close up of the block, top right. I think the lug may just have been cut off?

 

Yes agreed...

 

my engine man tells me that he looks after an ex-DTCC engine and that the head is machined at an angle - 2.5mm more off the exhaust side - this necessitates all the head bolt holes / water passages etc etc etc to all be remade and costs a bomb. Allows the use of 30mm exhaust valves.

 

spotted this the other day:

http://www.racecarsdirect.com/listi...bootlid_spoiler__also_brakes_engines_etc.html

notice at the bottom that he says other parts are available for the A4 and 80, including a head and block, may be worth asking for lots of photos or even someone buy it

 

What make engine is that Rob??

It may have been done on the audi engine to up the compression without skimming into the inlet valve seats?????

 

Here's a few more close ups of the block



Nice one of the underside showing the ladder main bearing



Some deck cooling (not sure if this is an early or late stage block??)

 

Interesting....... that spoiler would nicely on our A4

 

A few 6a head pics and dimensions, taken of my test head, hope they help in some way for comparison/reference
And yes i keep it beside the pc







I can take more pics if needs be, have a 6a block too.

 

and one at the same angle, appears the very same, bar a few bits machined off/lightened?

 

Similar - quite a lot of machining of stubs off on the Audi, but easy to see how the two relate.

The lug on the RHS is I-section on the Audi head, whereas it's a square blank on your 6A.

I think the part around the exhaust ports is different - machined on the Audi - but it various from KR to ABF anyway.

 

yea, just spotted the ''I'' section now Chris, doesn't look to be machined either as the edges dont look too sharp,athough it is the same on the left hand end, but machined away, hmmm, the mystery continues. i must dig out the pics of the abf head too.

 

Yep, ABF, KR, 9A - all needed for this, + ACE?

I've got a 9A and ABF down the garage.

 

only pics i can find of my abf head at the moment, it does capture the area discussed though..notice ''I'' piece is square on it too..

 

Ideally without the exhaust heat shield on...

 

Really interesting bespoke modification - the most obvious one so far on this thread.

Needed for acute temps from high compression? Enables higher comps on lower RON fuels?