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

HPR has flagged a possible supplier of pistons:

"AUDI Superproduzione", diameter 85 mm - http://www.pistonispeciali.it

(beware: not work safe - turn the sound down)

The writing on them says "K2-Engineering" or "K8" or "KB"...

 

I wonder Chris are they 16v pistons? It looks like the squish zone on them is the same height as the crown, maybe Im wrong but they look to be more profiled for the Fsi head? Im not sure, and its hard to tell from that picture.
(Btw, did you see the back drop picture in the above link, its epic!!)

 

Yeah, mountains of pistons!

 

Probably about 2 minutes longer than it needs to be, but feed your ears

[YOUTUBE]HKHlPAYWrOs[/YOUTUBE]

 

This is a very interesting thread.

The following site is well worth a read regarding peak power potential.

http://www.pumaracing.co.uk/PP01.htm
http://www.pumaracing.co.uk/PP02.htm
http://www.pumaracing.co.uk/PP03.htm

The author states that inlet valve area it the biggest factor in determining peak power potential. On the 3rd link he gives a rule of thumb relating valve area to flywheel power in balls out race tune. Using this rule and assuming money no object developement the Audi engine would need 34mm inlets to produce 302bhp.

Also discussed here

http://www.seatcupra.net/forums/showthread.php?t=30314&highl

Same RobT???

The puma racing author alsp talk about how good the Pug engine is. Anyone know how much power the pugs made?

 

Boy, the author sure does make it sound easy figuring it all out in them links!!
Squish area and shape is a massive factor too.

 

It pretty much is. Without sufficiant valve area, you wont make the power.

Think the 406's made just under 300 in BTCC trim, something like 297?... they used to blow up a lot though.

All this touring car engine stuff is very good, and very interesting, but just not real world for what we could use, with very narrow power bands and very regular re-builds.

Some of the quallifying engines (not Audi in particular) were also very different to the race engines, with more aggressive cam and c.r combinations, smaller crank journal sizes (less drag) and thinner valve stems... all designed to last a couple of banzi qualli laps but never a race distance.

 

I entirely agree - none of us would rebuild at the intervals these engines are designed for, after all, it was s they were injecting into it all, but it's certainly fascinating.

I'd wager that there's some headwork and inlet work to take away from it all. Sticking one on a flowbench would be mighty interesting.

 

Yep discussion from back in 2004, time flies when your having fun

In clubman competition, Pugs do very well. It seems that the engines have great potential for the spend that amateurs can realistically make. There are also some excellent pug engine tuners in the UK which helps a lot - something the the VW suffers from as there are very few places in this country any more that specialise in atmo VW engines.

Its not surprising that the pug does so well though:

VW 16V (9A/ABF-type); 32mm inlets, 28mm exhausts (7mm stems), 92.8mm stroke, 81mm bore, 1984cc
Pug XU10; 34.6mm inlets, 29.6mm exhausts, 86mm stroke, 86mm bore, 1998cc
Pug XU9; same valves, 88mm stroke, 83mm bore, 1905cc

The pug engine is just a better design as a base for a race engine - mahoosive valves and better bore:stroke ratio

(and the puma site reckons that a 36.5mm inlet will go in on std seats.....amazing.....really good cyl head design)

My ibiza has a pretty good engine in it and at sprints, is usually one of the fastest atmo saloons through the speed trap (120/1 mph). But there is a pug 206 that comes to some events that runs in roadgoing class that is not as quick overall as my car (as it has to run road tyres whilst I am on slicks) but is usually quicker through the speed trap (124mph). This is amazing - he will have no where near the corner speed of me onto the finish straight but is quicker through the trap. My car has >240hp. I managed to have a look at the car at the last race of the year and it has an amazing looking motor in it.....pukka Richard Longman engine with massive throttle bodies, carbon intakes etc....got to be making 260+....very good engines (and the car is beautifully built, penske dampers also!)

 

Nice interior shot of the Audi. Did the regs state they needed to leave the door cards in? I also would have thought the doors would be butchered to get the weight out, or made from GRP.

Rob - 240bhp from an ABF is pretty impressive. What spec is it?

 

see here - more or less current spec

http://www.clubgti.com/forum/showthread.php?t=103553&highlight=jc70

 

few more pics here http://www.supertouring.co.uk/the_cars/audi_a4.html and this makes interesting reading http://www.audiworld.com/news/02/unfairadvantage/content.shtml

 

Agree - odd they're not carbon moulded panels

Cracking read

Aka / later Apex Motorsport in Buckingham, run by the late Richard Lloyd, co-creator of GTI Engineering.

 

http://www.jaguar-enthusiasts.org.uk/apex-motorsport-history.html

 

Bobby Fryers by any chance Rob?

 

yep - Bobby Fryers / Mark Teale car.

They beat David Marshall in his 205 by 0.6secs last time at Aintree and David is well quick. (53.00 vs 53.64 and 3rd place was 57.4!) An awesome pair of cars, but damn, that 206 has some engine in it.

 

They all get whupped by a Polo G40 at Harewood, trap speed included! The car in question finished 1st and 2nd in the Harewood championship this year (shared car).

That 206 does have some shove, but I think it struggles a bit with weight and a lack of nimbleness when the motor can't be exploited.

Apologies for the off topicness.

 

A few links

West suffolk racing has run these cars before in the Uk so should have engine info.

http://www.wsr-racing.com/ Might be hard work getting in tho.

and this is a nice link as well

http://www.neuspeed.com/supertouring/A4forsale.html

 

Also this might interest someone

http://www.closeratio.com/asp/