josman

I am planning a budget for the "low-end" rebuild of my motor within the next 50,000 miles. I am also planning a budget for a top-end rebuild of the motor within roughly 100,000 miles.
(Motor currently has 150K on it and the exterior/interior of the car are immaculate.)

Does anyone know the feasibility of utilizing parts from the 2002(?) Avant S6 parts bin for my motor as I do these rebuilds - ending up with a 340 H.P. S6 motor in my A6 when I am done with both rebuilds?

I am thinking a blueprinted/balanced, ported/polished version of this motor would be pretty "hot" - maybe get in the upper 300's as far as H.P. is concerned and bump torque up-into the low 300 lb. ft. range somewhere?

I have to start somewhere and the low-end is the place I have to deal with sooner. The "bonus" of this is I will not have to mess with the S6 engine CPU and other *really* expensive stuff until I am ready for the top-end work on this motor and I change-out cams/valves, etc. where engine control will be affected.
(Fortunately, at 150K miles, the top-end of my motor is immaculate and requires nothing at this time.)

Does anyone have any recommendations for an Audi specialist who does rebuilds of Audi motors (specifically the 4.2 V8)?

I am keeping this car for the long-haul, so any help will be greatly appreciated.

Thank you for your help!

John

4Driver4

It is not worth the time and money to rebuild the engine even if there is a problem with it (which I'm guessing there isn't since you do not mention one). This is not a '71 Camaro; these engines are generally good for well past 150k miles. If the engine blows up, best bang for the buck is a used engine. If you are looking to get more power from the engine, go stand-alone engine management.

In the long run it might be cheaper/easier just to sell the car and buy an S6.

<flamesuit on>

FinnishPride

2nd

josman

I appreciate the feedback.

I *used* to believe my 4.2 V8 was "good" for well past 150,000 miles.....however the engine is starting to consume quarts of oil at a somewhat alarming rate.

This is an engine which has had synthetic oil changed every 5,000 miles and dealer servicing every 10,000 miles.

Probably 100,000 of the 150,000 miles are "highway miles" where I was averaging 70-75 m.p.h. and loafing-along at 2,400 r.p.m.

I specifically paid the premium for the V8 not only because I liked it better than the 2.7T motor, I also (rightfully, I would think) believed it was a far less "stressed" motor, compared with the 2.7T.

In any event, the top-end of this motor is absolutely flawless and could not be in better shape at 150,000 miles. Unfortunately, I believe this engine needs new rings or something to cure its appetite for oil.

Anyway, that is the reason I am willing to invest the $'s to "bring it back" if I can, in two segments......low-end now and top-end later.

I have also heard these engines cannot be rebuilt, which I would find very surprising.

Anyway, we shall see......no big rush, just trying to plan in-advance if I can find a way to do this.

Thanks!

April

loafing along, the rings could get carboned up, which eventually prevents them from making a good seal. All depends on how the engine was designed - and in this case it's high speed running.

You need to drive the car hard for at least 20 minutes at one sitting every once in a while, to help blow out carbon. This means higher rpms and high load. It may be too late now, with too much carbon buildup to make this effective.

Run a bottle of BG44K (get it at most German car dealer parts depts) in a tank of fuel and drive the car hard. Might help.

Just something to ponder.