Avanti ll Torque!

[mfg]

Torque of the 400 cubic inch engine,which was factory installed in several mid 70's Avanti ll's, is .....?..... ft lbs at 2400 RPM.

1) 285.....2) 335.....3) 390.....or......4) 420

[mfg]

Ideas?

[pantera928]

335

Bitten by the message timer again!!!!!

[1963r2]

285

[mfg]

2 hours ago, pantera928 said:

335

Bitten by the message timer again!!!!!

No, not 335!🤔

[mfg]

9 minutes ago, 1963r2 said:

285

No, not 285 either!

[pantera928]

390

[mfg]

17 minutes ago, pantera928 said:

390

That's it PanMan! 😄

[brad]

Not correct. By the mid 70's manufacturers used NET figures, not GROSS figures in determining outputs. They were listed less than 1/2 of previous 60s figures.

For instance, Chevrolet lists the 76 400 as 175 hp, and 305 ft lbs of torque.

[mfg]

1 hour ago, brad said:

Not correct. By the mid 70's manufacturers used NET figures, not GROSS figures in determining outputs. They were listed less than 1/2 of previous 60s figures.

For instance, Chevrolet lists the 76 400 as 175 hp, and 305 ft lbs of torque.

So Avanti Motors lied to us??? 😄

[Dwight FitzSimons]

IIRC 1971 was the first year for net horsepower and torque ratings on American cars & trucks.  And (IIRC) 1971 was also the first year of much lower compression ratios, which lowered HP ratings.  Smog equipment also contributed to lower ratings.

--Dwight

[mfg]

Well, I'm not so sure Avanti Motors lied to us....

They claimed 390 ft lbs of  torque from 400 cubic inches....

In '56, Studebaker claImed 380 ft lbs of torque from 352 cubic inches...

What's up here? 🤔

[Gunslinger]

A lot depends on the camshaft specs where the engine has its power and torque curve applied.  The 400…which can be turned into a real torque monster…was basically a station wagon engine.  Due to its intended use Chevy engineers gave it a more torquey camshaft design.