A couple basic V8 swap questions - Siena et al, any feedback here?
#21
10-08-2009, 12:23 AM
So why not use the S4 chain driven 4.2L engine? Which is 25% smaller in size, but puts out 340 horsepower? They put out 360 with a chip. Can't those engines be used?
#22
10-08-2009, 12:23 AM
So why not use the S4 chain driven 4.2L engine? Which is 25% smaller in size, but puts out 340 horsepower? They put out 360 with a chip. Can't those engines be used?
#23
10-08-2009, 04:25 AM
thank you so much Siena. I think my car would be a perfect transplant body for the 40V engine or if i can get my hands on a low mileage S8 engine. also i was looking at car-parts.com and they have 01 A6 with a 4.2 V8 with engine code AWN. what's up with that? i searched for 01 A6 engine, zip code 13903 and for part i selected engine. i can't post the link as it'll just send you to the homepage
#24
10-08-2009, 04:35 AM
As you can see from the 077 series engines I've listed, there are 340hp engines in 32V form, and 360hp versions in 40V guise too.
I haven't come across a chip that would give a verified 20hp increase on the 340hp chain-driven unit. I prefer the older belt-driven units, the blocks are physically stronger (079 series is lighter, with thinner walls). There have been reliability issues with the B6 / B7 S4 motor, (BBK) whereas the 077 series engines are very reliable.
The 077 series motors are a proven unit, with a Motorsport pedigree, which means they're over-engineered for road use - think back to the V8 DTM series, where these engines were used in the original Audi V8, from 1989 - 1994. Pretty much like the I5 turbo motor was over-engineered for road use, during the Group B era in the Ur quattro.
The 079 series chain-driven V8 has no such pedigree that I can recall.
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