Audi S5 TC

And, what is the maximum amount of torque you can get out of 1L normally aspirated without mods?

HPH

1 liter is 1000 cubic centimeters; there are 2.54 centimeters in an inch; 1000 / 2.54^3 ~ 61.

And I'm afraid that your second question isn't really well-posed, although someone may have an estimate. HPH

Audi S5 TC

My estimate (which is just a mere guess) for my second question is 77 ft/lbs. But that is like I said, just a mere guess. I don't know for sure. It could be higher or lower.

QCRAZY

..for here, just Audi's or any car, but 77 ft-lbs is a good guess for NA engines. For Audi...

S6 - 74.3 ft-lbs/L
S8 - 76.0 ft-lbs/L

If you want to look at others (Porsche):
968 - 75.3 ft-lbs/L
986 - 72.4 ft-lbs/L (1st generation Boxster)
996 - 80.5 ft-lbs/L

HTH!!

Peter B.

<ul><li><a href="http://www.convert-me.com/en/">http://www.convert-me.com/en/</a</li></ul>

HPH

...it implies the Audi 4.2 liter V-8 is around 256 ci -- 10%less than the 283 V8 my Dad had in the '62 Chevy I learned to drive in. But the 4.2 has way, way more power and torque. This is why the torque/displacement question isn't well posed -- the answer also depends on many other factors.

It also imples that the 426 Hemi that Chrysler used to market is 7 liters. Consider what that would put out with a bi-turbo system! HPH
HPH

Capt Ron

That 283 Chevy also had:

One cam (vs 4)

8 valves (vs 32)

2 bbl carburetor (vs multi-point, electronically
controlled fuel injection

Coil/distributor ignition (vs electronically
controlled direct spark w/ plug mounted coil)

Effective compression ratio of about 7:1 (vs 10.5:1)

Two speed powerglide transmission with out a
lockup torque converter (vs 5 sp with lockup)

equivalent weight

engine-driven accessories that were less efficient than modern counterparts

HPH

...which is why these modern powertrains are far more fuel efficient than they were 40 years ago.

But I'm still stuck on the notion of a 750 hp bi-turbo hemi. Damn. HPH

Capt Ron

Why do I think Hemis do not take kindly to turbocharging?

Audi S5 TC

That is because the A6 has Audi's now (significant) trademark five valve per cylinder technology.