HP and Torque?

[5.0]

.


So if a 5.0 HO from a '92 Thunderbird is rated at 200/275 hp/torque, and the '91 Crown Vic motor is rated at 150/270, is the HO motor actually stronger even though the torque is nearly the same? What differences would be noticed if driving each of them in the same vehicle?






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[baddad457]

The heads and camshaft are the difference Between those two applications. The Vic heads run out of steam at a lower rpm.

 

[EMB1230]

I believe the 5.0 HO in the t-birds was a more restricted version of the one in the Mustang. Looking back, it's funny how we used to consider 200hp High Output!

 

[Teddyzee]

Horsepower is a function of torque and rpm

(torque X RPM)/5252 = HP

So it's just a function of the calmer engine running out of air (heads, intake, cam, valvetrain, etc) earlier as baddad said.

Horsepower and torque curves on a four stroke engine always cross at 5252rpm.

 

[85_Ranger4x4]

They also have a different intake, tune and exhaust.

I find it kind of weird that a roller cam, over half a point of compression and multi-port fuel injection only gave my '87 15hp over my '78 that had a 1.08 venturi 2bbl carb (sought after for 2.8's), 8.4:1 compression and a flat tappet cam.

I know the heads are not supposed to be the best, but neither are the '78's... I just wonder how much of that rating is related to the crap surrounding the engine vs just the longblock itself.

 

[baddad457]

I believe the 5.0 HO in the t-birds was a more restricted version of the one in the Mustang. Looking back, it's funny how we used to consider 200hp High Output!

His T-Bird HO motor also has the 86 Stang's E6SE heads. The 93's got the E7's (I think), plus the 93 Cobra cam. All had the same intake (and FEAD) later used on the 94-95 Stangs.

 

[fordmike1]

I think that the tuning of the computer in the T-bird was also why its engine made less power then the Mustangs 5.o. I am talking about the 87 and up T-birds.

 

[flaminranger]

I know the t-bird had a smaller cam than the mustang but not sure about the vic. also the intake on the tbird looks like the 94-95 stang but it was shorter with smaller runners.
I am not sure but I think they came with 55 mm mass air meters and 52 mm throttle bodies as well.
also the newer vics(with the 4.6) never had true dual exhaust it went into one then back out to 2 pipes @ the back so the older ones may have been the same. I know thats how some of the lincolns were

 

[5.0]

His T-Bird HO motor also has the 86 Stang's E6SE heads. The 93's got the E7's (I think), plus the 93 Cobra cam. All had the same intake (and FEAD) later used on the 94-95 Stangs.

So are you saying that a '92 T-Bird 5.0 HO has the same craptastic E6 heads that my '91 Crown Vic motor has? Does it also have the pistons with no valve reliefs? I think that '92 was the last year for forged pistons in the T-Bird 5.0 HO. The reason I'm asking is because there is a '91 or '92 Cougar in the pick n pull with the 5.0 HO that I wanted to get and put a big cam in it, but not if it's the same pistons and heads as my Crown Vic motors. I always figured the T-Bird 5.0 HO had normal pistons and E7 heads... but I don't know much about engines really.

 

[5.0]

So will the engine with more hp, but the same torque, be able to accelerate the same car faster than the engine with lesser hp? Let's figure on using the best possible rear end gear ratio for each, but otherwise identical cars.

 

[baddad457]

So are you saying that a '92 T-Bird 5.0 HO has the same craptastic E6 heads that my '91 Crown Vic motor has? Does it also have the pistons with no valve reliefs? I think that '92 was the last year for forged pistons in the T-Bird 5.0 HO. The reason I'm asking is because there is a '91 or '92 Cougar in the pick n pull with the 5.0 HO that I wanted to get and put a big cam in it, but not if it's the same pistons and heads as my Crown Vic motors. I always figured the T-Bird 5.0 HO had normal pistons and E7 heads... but I don't know much about engines really.

You can verify the heads by checking for the presence of an "S" located in the front corner of the passenger side head, right next to the valve cover.Same letter will be found on the oppositer end of the driver's side head. E7 heads have a "T" in this same location. If it has "S" heads, it's got pistons without valve reliefs (unless a different short block was mistakenly used somehow) It WILL have the HO cam in a 91-92 motor. For some reason, the cam list doesn't show the T-Bird motor for 89-90, pre 89's have the Vic cam.

 

[baddad457]

I know the t-bird had a smaller cam than the mustang but not sure about the vic. also the intake on the tbird looks like the 94-95 stang but it was shorter with smaller runners.
I am not sure but I think they came with 55 mm mass air meters and 52 mm throttle bodies as well.
also the newer vics(with the 4.6) never had true dual exhaust it went into one then back out to 2 pipes @ the back so the older ones may have been the same. I know thats how some of the lincolns were

The 91-92 T-bird/Cougar motors have the same cam as the HO's got. 93's got the GT40 Cobra cam.

 

[Teddyzee]

Little bit of info to add.
There was no 5.0 Thunderbird in 1989 and 1990, that's why you're not seeing specs...

Also, 1993 Cougar/Thunderbird were available with the Cobra engine (F3ZE cam,etc.). I'm not sure if every 5.0 H.O. was the Cobra version, but this can easily be researched if anyone feels the need. Here's the cam chart for various 5.0 models.

http://www.allfordmustangs.com/forums/attachments/5-0l-tech/41463d1206189719-cobra-cam-vs-gt-cam-cam-specs.gif

I'm not 100% on the '93 Cougar/Tbird details, but I've heard of the 1.7 RRs, definitely the short sn95 FEAD and intake manifold, but I do not recall if these included gt40 heads like the 1993 Mustang cobra.

What was the question again, lol...

So will the engine with more hp, but the same torque, be able to accelerate the same car faster than the engine with lesser hp? Let's figure on using the best possible rear end gear ratio for each, but otherwise identical cars.

If you're talking about similar engines, and a similar torque peak rpm, such as the 5.0 engines mentioned, the higher revving (higher horsepower) engine should walk all over the lower revving (but similar torque number) version. This is not a generalization, however. (think turbo diesel vs. 4.6 truck)

 

[Teddyzee]

And a little more discussion, my donor engine actually came from a 1992 Lincoln Mark VII, as you can see, is has forged pistons with valve reliefs, and up until the moment this pic was taken, it had E7 heads.

 

[flaminranger]

The 91-92 T-bird/Cougar motors have the same cam as the HO's got. 93's got the GT40 Cobra cam.

yeah you maybe correct we pulled the motor out of a 93 and it had less lift. I am not sure about the 91/92 birds.I do know the cobra cams had less lift on the cam but made up for it with the 1.7 rockers. something about piston to valve clearance or something like that.lol