[Brian M]

Man this whole overdrive thing is a blast! Cruisin at 60mph, 2000 rpm is just awesome!

 

[FEandGoingBroke]

I'll tell you something, if you answer me something ok?

What RPM does your engine's HP and TQ, cross numbers?

Then tell me what kind of mileage you get at 60 mph...

Then tell me what speed you are going in top gear with the engine at the RPM that the powers converge on...

FE

 

[Motorhead]

FE: is that a trick question? Every engine that has ever existed and ever will, the HP and TQ cross at exactly 5250rpm. And so if he's going 60 at 2000rpm, he'll be going exactly 157.5MPH at 5250 in OD (well, will probably run out of power well before 157mph, but theoretically).

_________________
'86 Bronco fullsize, 460, E4OD
'85 Ranger, 340hp 289, T5

<font size=-1>[ This Message was edited by: Motorhead on 5/9/06 12:51am ]</font>

 

[Luv70sFords]

Honestly, that engine will likely be able to make power that high. Its a very well built, large cammed cleveland that I've had the priveledge of driving when it was in the Monster Mach. I wouldnt be surprised at all to see it go even faster, especially in the relatively aerodynamic Torino...

 

[ujt389]

FE- Ill tell you this my mustang gets 20 mpg at 65 to 70mph with a 302 that puts out 300rwhp. I rev about 2300 rpm at 65. Not a lot of passing power though, but the downshift into 4th is always fun.

 

[FEandGoingBroke]

I wasn't asking for the LITERAL crossing...

I wanted to know what rpm it really cooked that's all.

Because: My Cherokee 4.0, get's 14.3 MPG almost EVERYWHERE I drive reguardless of the speed until I go above the speed limit.... When I am going 80 I get about 15.2 to 15.5 mpg.

When I am going 95-99 MPH with the occasional 100, I get 19.2 MPG, not a drop less.

I have done this 2 times from full tank to empty with the same results, one time was relatively flat country, the other time was mountains up and mountains down the whole trip.

My jeep LOVES 3600 to 3800 rpm in Drive in the lockout. I'd bet that your car will give you suprising gas mileage at around 80 to 85 MPH.

FE

 

[Brian M]

I haven't drove it enough yet to know the difference. I was getting about 10 mpg previously. Currently having some oil pan issues that is keeping me from driving it.


I'm guessing the hp peaks around 6000-6500 or so. Once I get the new gears broken in well, I plan to have it dyno tuned so I will have some good numbers.

With the toploader and 3.25 gears, I have had it to 6k rpm in 4th. Thats around 140-145 mph or so. I doubt I am gonna push it much in overdrive anyways doin 140 is scary enough in that car.

 

[FEandGoingBroke]

I still say you'll get your best mph at about 80 mph, maybe a tiny bit faster...

FE

 

[Brian M]

Sounds good to me, I usually cruise around 75-80 anyways

The real gain here was noise. Long trips with the engine buzzing gets tiring real fast. I now dont have to blast my stereo just to hear it. If I get better mileage, then thats nice but it wasn't the main goal.

Going from a toploader an 3.25 to a T5 with 3.89 has been very good so far. I no longer have to roast the clutch to get up on the ramps, and 1st gear is definitely fun from a stop light. Shifting is much tighter, I have to get used to not having to move the shifter a couple feet to get to each gear

 

[thekingofazle]

Hearing all these stories just makes me want a T-5 even more.

With that plus fuel injection I think I might could knock down 18MPG.

 

[ujt389]

<font size=-1>[ This Message was edited by: ujt389 on 5/12/06 3:47am ]</font>

 

[TorinoStyle2]

On 2006-05-08 09:49, Motorhead wrote:
FE: is that a trick question? Every engine that has ever existed and ever will, the HP and TQ cross at exactly 5250rpm. And so if he's going 60 at 2000rpm, he'll be going exactly 157.5MPH at 5250 in OD (well, will probably run out of power well before 157mph, but theoretically).

_________________
'86 Bronco fullsize, 460, E4OD
'85 Ranger, 340hp 289, T5

<font size=-1>[ This Message was edited by: Motorhead on 5/9/06 12:51am ]</font>

Who told you that??
I've seen diesels that cross at much lower speeds than 5252!!
And I've seen a racing rotary engine that its peaks never even crossed.....way above 5252!!

 

[Brian M]

That would be science and fact:

http://www.carcraft.com/techarticles/868/

 

[retyler]

Excellent article.

 

[tonys10sec306]

i wish i had a overdrive in my capri

 

[Motorhead]

On 2006-05-14 21:43, TorinoStyle2 wrote:
Who told you that??
I've seen diesels that cross at much lower speeds than 5252!!
And I've seen a racing rotary engine that its peaks never even crossed.....way above 5252!!

The graphs you were looking at may have had the HP and TQ on different scales, for instance if the top line was 500hp and 400ft/lb.

 

[thekingofazle]

Yep - it has to cross at 5252, because of the way HP is calculated. It may not "cross" because the axes are labelled differently, but the torque and HP are equal at 5252.

 

[casscomputers]

My 66 thunderbird has a 5 Speed with overdrive. I have 4:11's and run 2450 rpm's at 65 mph.
Engine
390 Fe
10.5:1 compression
Cast heads with 16 bolt exhaust using stainless steel valves
hardened seats and pocket porting
Edelbrock Performer Pus Cam
Adjustable ratio rockers
5/16 hardened pushrods
Tri power intake system
Custom shorty headers dumping into side pipes
370 hp at 4800 RPM
475 ft torque at 3000
Car weight 4600 lbs
Engine will pull the car in overdrive as low as 1500 rpm
I love the combination.

<font size=-1>[ This Message was edited by: casscomputers on 5/16/06 5:02am ]</font>

 

[casscomputers]

Hp and torque meet at 5252 due to the fact that this is part of the formula. HP can not be measured directly!!! It is a calculation of torque and rpm! If you see other wise check your math.
PLEASE READ THIS WEBSITE.
http://vettenet.org/torquehp.html

 

[Brian M]

On 2006-05-15 13:54, casscomputers wrote:
My 66 thunderbird has a 5 Speed with overdrive. I have 4:11's and run 2450 rpm's at 65 mph.
Engine
390 Fe
10.5:1 compression
Cast heads with 16 bolt exhaust using stainless steel valves
hardened seats and pocket porting
Edelbrock Performer Pus Cam
Adjustable ratio rockers
5/16 hardened pushrods
Tri power intake system
Custom shorty headers dumping into side pipes
370 hp at 4800 RPM
475 ft torque at 3000
Car weight 4600 lbs
Engine will pull the car in overdrive as low as 1500 rpm
I love the combination.

<font size=-1>[ This Message was edited by: casscomputers on 5/16/06 5:02am ]</font>

What size tires you running on the rear?

As soon as I get my carb finished, I am gonna have it dyno tuned, all estimates put it at about 500-530 hp @ 6500 rpm.

Current setup (built by Larry):

351C 4v close chamber heads
11.1:1
Cam is a solid roller, .560/.585" lift, 246/256 @ .050, 108 lobe separation.
Weiand X-cellerator, and sanderson shorties. 2.5" with dumps before the axle, no crossover pipe.

So far its a blast, still takin it easy to break in the rear end gears.