Motor change under warranty

[ArthurPE]

there is also a thread on quattroworld
"Here's one: Highest mileage/duration without a carbon clean or CEL?"

one car has 85k miles, never had a CEL, no percieved power loss...

here's the TSB http://uberlame.com/a6_tsb/Engine/MIL%2 ... 4753-7.pdf

there are people who have the valves cleaned, and get a checklight within a few 1000 miles
others have never been cleaned in >40k miles, and never had a light
if it was an issue with the design, ALL engines would have the checklights with 10k miles, and they would repeat even after cleaning...

how many here have had a check light for 'power loss'? or for any reason?

if you rea SR71's link you'll see there are more people who were denied a cleaning...given a can of cleaner and sent on their way...

[MikeD]

always was...they've been doing it for a few years now...
they have a few SIB's out
MIL light must be on, sustained cold start mis-fires...no code, no clean
very few cars have codes...
1 check fuel quality (usually the problem)
2 use injector cleaner
3 then pull manifold
btw: this guys MIL came back after the cleaning...
how do they know it's down on power?

Ok! a couple of questions for you ArthurPE

1) When you say "this guys MIL came back after the cleaning"
are you talking about MY car or another???:?:
2) You have stated on countless posts that the carbon build up is not an issue for this motor.
So why do you now state that Valve stem cleaning has always been covered by the USA warranty, if its not an issue!
3) Do you actually have an Audi RS4 B7?:?:
The reason I ask is that some of the comments you have made make me wonder if you are able to offer "first hand" info, or just repeat hear say?
4) When you say "Audi timed them, almost all met spec"
Please explain how "Timed" can be used to measure the BHP of a motor, it dont know what you mean by this, so please help me out

Anyway, work all done and I have a much better car after to before.

[ArthurPE]

1 another car, not yours

2 not only this car, all FSI, but it's not normal, it is cleaned becasue something else failed and allowed the carbon to get out of control...
it's called consequential damage, a byproduct of some other failure (fuel pump, flaps, etc.), that is what the carbon is...
go in and ask Audi to clean it for the heck of it and see what they say...
but this has nothing to do with your engine...your failure was not carbon related...isolated to 1 cylinder...what did they tell you that made it fail?

3 yes, I have one, and I have worked with engines for 30+ years
they are all the same, no magic, just engineering & mechanics
if I have a question, I ask Audi

4 ?????
get a known healthy engine, in a few different cars...run tests in various gear(s) timing with vagcom, a bunch of times (statisically significant)
record the times
then do the same with a 'suspect' car, if it runs the same time, factoring temp/etc., then it is making the same power as the other car...which is making rated because you have made sure it's running right...

Audi's spec for these tests/times has been poster here
and I have a bunch of data for 3k to 8k 3rd gear runs, cleaned vs uncleaned, etc.

Ok! a couple of questions for you ArthurPE

1) When you say "this guys MIL came back after the cleaning"
are you talking about MY car or another???:?:
2) You have stated on countless posts that the carbon build up is not an issue for this motor.
So why do you now state that Valve stem cleaning has always been covered by the USA warranty, if its not an issue!
3) Do you actually have an Audi RS4 B7?:?:
The reason I ask is that some of the comments you have made make me wonder if you are able to offer "first hand" info, or just repeat hear say?
4) When you say "Audi timed them, almost all met spec"
Please explain how "Timed" can be used to measure the BHP of a motor, it dont know what you mean by this, so please help me out

Anyway, work all done and I have a much better car after to before.

[Verruckt]

and that the RS5 was a different engine...

It is Arthur, it's nearly a clean sheet design sharing only basic dimensions with the RS4 engine...

Consider it an R8 V10 engine minus two cylinders rather than an evolution of the RS4 engine.

http://www.automobilemag.com/reviews/dr ... index.html

While most future RS models will be powered by twin-turbocharged engines, both the upcoming, Europe-market RS4 Avant and the RS5 coupe get a high-revving, normally aspirated, direct-injection, 4.2-liter V-8. It makes 450 hp, 30 hp more than the old RS4's V-8 of the same displacement. Stephan Reil, R&D chief in charge of all Audi RS and R models, explains: The high-revving V-8 is better suited for this particular vehicle concept than a twin-turbo V-6. When you consider the extra plumbing, the more complex exhaust system, and the additional cooling requirement, the weight penalty of the V-8 shrinks to less than 40 pounds. The engine for the RS5 was practically developed from scratch. It develops more power and torque than the outgoing unit, yet it uses twenty percent less fuel. Although the redline was pushed up to 8500 rpm, maximum torque, an identical 317 lb-ft is now available between a less hectic 4000 and 6000 rpm. Engineering highlights include a two-mode intake manifold with tumble blades, variable intake and exhaust timing, and a multimode exhaust system.

To trim parasitic losses, Audi reduced piston friction, lightened the DOHC valvetrain, and fitted a variable-output oil pump. A regenerative braking system increases alternator output during deceleration and reduces its output during normal driving. A seven-speed dual-clutch S tronic automatic is the only available transmission.

[ArthurPE]

really?
if you mean by basic dimensions:
bore
stroke
18.5 mm cylinder offset
90 mm cylinder spacing
90 eg V angle
same block, exactly, same materials, same cylinder treatment
same heads
same crank

the only difference other than intake and ECU is compression ratio (the squish dimples are a bit bigger), reduced for a bit more lift and more clearance due to reving 500 revs higher



4.2 V8 32v FSI 257-309kW
The 4.2 FSI V8 as installed in the Audi R8 Fundamentally based on the existing Audi 40 valve V8 engine, this new engine is heavily revised over its' predecessor, with all-new components including: crankshaft, connecting rods and pistons, cylinder heads and valvetrain, oil supply and cooling system, intake path and exhaust system, and engine management system. It is available in two versions; a basic or 'comfort' version, first used in the Audi Q7; and a sports-focussed high-revving version, with features which hail from motorsport, for the B7 RS4 quattro and the Audi R8. This is the first eight cylinder road car engine to use Fuel Stratified Injection (FSI), which was successfully developed by Audi in their LeMans winning R8 racing car. The 5.2 V10 FSI will be developed directly from this V8 engine.


it only makes good business sense...it's a good engine, the RS5 is limited production, and times are tough, ie, economy, why reinvent the wheel,when you have a perfectly good one...