: Specs



89fatb
02-07-06, 03:00 PM
HOW COME WHEN I SEE SPECS ON THE 307 SOME ADVERTISE TORQUE RATINGS AT 346FT LBS OR SOME AT 240FT LBS. I PERSONALLY THINK IT THE LATTER OF THE 2 BUT IM CURIOUS Y THEY SAY THAT :confused:

BluEyes
02-07-06, 05:07 PM
Where do you see 346 listed? I agree, highly doubt that number, even at the flywheel...

iNdy.j
02-07-06, 05:13 PM
Mine is rated at 224, I have never seen anything higher.

ralphb
02-07-06, 05:45 PM
According to the Cadillac brochures for 1987 to 1990 307, the rated torque is 255 #ft. at 2,000 RPM

For more info on this subject, see my recent post under the 5.0 Heading, comparing the 305 and the 307.

N0DIH
02-07-06, 06:37 PM
1985-1990
307 "Y"'s were 140 hp / 255 lb/ft torque
307 "9"'s were 180 hp / 245 lb/ft torque

1984 and older were 150 hp (larger intake/heads)

iNdy.j
02-07-06, 07:50 PM
I would be the Y catagory, SWEET!:bouncy:

N0DIH
02-07-06, 08:52 PM
"Y"'s were common, "9"'s were 442's, HO (Hurst Olds) and V92 or Limo optioned Cadillacs.

I~LUV~Caddys8792
02-07-06, 09:15 PM
They quote 346 lb/ft in the "Standard Catalog of Cadillac", and the "Standard Catalog of American Cars 1976-1999"

I used to get really confused by that too, until I asked a mechanic, and he said there was no way that 307 would make that much torque with that little HP.

N0DIH
02-07-06, 09:50 PM
It is a function of rpm vs torque.

T = (5252 x HP)/rpm
HP = (T x rpm)/5252

So if you are making 255 lb/ft torque on your 307 @ 2400 rpm, you are making a miserly 116 hp. BUT, on the other hand, at 4400 rpm (I think that is peak HP) you are making 167 lb/ft torque. That is a fairly flat torque curve. If you have driven a 307, you are likely aware just how flat.

Now we compare it to a 307 HO "9". 245 lb/ft torque came in around 2800 rpm, and peak hp around 5000 rpm. So we look at torque at peak hp is 189 lb/ft, and hp @ peak torque is 130 hp. Very different engines. Hence why 307 HO's in 442's and Hurst Olds came with 3.73's and 26 in tall tires. They did well for a 307.

Sounds like it really sucks doesn't it. But, look at the Cummins Inline 6, 855 CID that they install in the Army 5ton truck. 250 hp. that is it, for something that is capable of towing 55,000 lbs. Can it do it? YES. 1000 lb/ft torque @ 1000 rpm. That is 190 hp@1000 rpm. And 625 lb/ft torque @ 2100 rpm (peak hp). HP is low in the diesel, but big on torque.

davesdeville
02-08-06, 06:43 AM
There isn't going to be any N/A engine made in the 80s especially pushing more torque than it has cubic inches...

I~LUV~Caddys8792
02-08-06, 01:51 PM
There isn't going to be any N/A engine made in the 80s especially pushing more torque than it has cubic inches...

Exactly.. Even my LT1 was pushing 330 lb/ft for 350CID.

Katshot
02-08-06, 01:56 PM
1985-1990
307 "Y"'s were 140 hp / 255 lb/ft torque
307 "9"'s were 180 hp / 245 lb/ft torque

1984 and older were 150 hp (larger intake/heads)

That agrees with my Cadillac factory service literature.

Another good example would be the Northstars (9 & Y codes) the HP and Torque varies inversely and the one with the lower torque needed shorter gears.