HT4100 4.1, 4.5, 4.9 Discussion, 4.9's torque in Cadillac Engine Technical Discussion; Hi all,
I found a 1991 Cadillac "Touring Series" brochure featuring the Allante, Seville STS, and Eldorado ETC. In it, ...
Yeah, Caddy 4.9 and Jeep 4.0 both have a very similar, very flat torque curve.
I miss the 4.9, it was a darn good engine, tho the Ford 4.6 produces nearly the same numbers (10 extra hp) from less displacement, it's much more refined, which I guess is a good and bad thing... the 4.9 had a really nice raspy sound to it, not ala redneck stright pipes on a pickup... but, well ya'll 4.9 owners know what I mean. Plus the throttle response of the 4.9 was pretty good for what it was too.
4.9 would make an awesome off-road engine, it's been done before in both Isuzu and Toyota, not the easiest as there are no kits avalible as other engines, but the PFI, realitive ease of getting electronics to work and.... the torque and torque curve make it a great truck/off-road engine.
Automobile(s): Cadillac 1993 Deville 4.9, 1991 Eldorado Touring Coupe
Re: 4.9's torque
When i first got the Deville, I noticed the pedal was a little more tight in comparison to a Lesabre i was driving before it.
I think they did this at the factory to keep granny from melting the tires on her way to the beauty parlor if the weight of a foot was all that was required. Thats the torque on the 4.9
I never seem to have to stomp the pedal to get that car going. I never hear that engine huffing either. Moving the 4600 pound car around and getting it to speed is no work for that motor, No work at all.
I start from red lights easy and simply progress pressure on the pedal evenly, Never stomping on it ,and when i think im at about 40 mph i look at the speedo and its in the 50`s. Knock on wood no tickets yet, But im used to "feeling" the engine work to tell me my relative speed and adjust pedal pressure that way, But at the speeds mentioned, This motor is just not working hard at all...at all!! i don`t think the pedal gets pushed past the 1/32th mark of its travel to get going like that..... I love it!
I start from red lights easy and simply progress pressure on the pedal evenly, Never stomping on it ,and when i think im at about 40 mph i look at the speedo and its in the 50`s.
That sensation is one of my favorite things about the 4.9, God I miss being able to do that!
I remember reading somewhere that when Cadillac came out with the HT4100 in the early '80s, the engineers knew how little torque that engine made, so they made the throttle cables shorter so it would take less throttle to get moving, which made it seem as though it was pretty torquey, and you'd feel that.....until you jammed the throttle to the floor to pass someone and then realized how much of a dog those are in those big heavy D Bodies.
220 lb-ft at idle? Man, I always wondered why I beat a 540i off the line in my '94 DeVille! I've got 154,000 miles on my 4.9L, and it is honestly the best running engine in our fleet of cars, including a 2002 Silverado with 51,000 miles! Even the original Hydra-matic 4-speed automatic transmission has never been rebuilt and it shits great. Uncompromised performance, and a very reliable runner. Makes a great daily driver even with the high miles!
Automobile(s): Ex:'92 ETC 4.9 Current:'91 Sedan Deville 4.9
Re: 4.9's torque
I love how when i'm in first gear before the transmission shifts to second doing about 20 mph when i stab the pedal the front lifts and the tires squeal for about half a second and then the whole car takes off.
I was wondering how much off idle torque this engine made.
It makes sense that every time my foot gets a little excited after the light turns green the rear squats and the front end jumps up until I back off just a little.
Anyone who doesnt know the specs will swear this thing makes over 200 hp, but its really the plethora of torque in first gear.
I looked at the specs for the Jeep 4.0 and @ 3200 rpms it makes 235 lb-ft with 190 hp @ 4600 rpm, also has a higher redline than the caddy @ 5300.
I'll take torque over horsepower anyday. Torque seems like it builds faster and gives you that raw kick in the butt push your head back feeling,