Help with HP/Torque Calculation

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Sep 7, 2007 | 08:39 PM

Lance Hogan

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Joined: Apr 2007

Posts: 528

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From: Charelston, Illinois

Help with HP/Torque Calculation

I am new to the FE forum and have been reading several posts. It is evident that the you guys know your stuff. I am writing to see if someone would calculate (estimate) the horsepower/torque of my 390 using desktop dyno. I had the engine rebuilt, but it is not currently installed as I am trying to complete my 1955 Ford F100 project. Below are the parts in my engine. Any help you would give me would be much appreciated. Thanks, Lance
<O

</O

Block: 390 bored .030 over

Heads: 410 heads (C3AE - new seats, valves, and guides)

Pistons: TRW pistons (.030 over) L2291Fs<O

></O

>

pistons to be below deck was .012".

Cam: Speedpro

Intake Exhaust

.050 Dur. 214 224

SAE Dur. 292 302

Cam Lift .295 .310

Valve Lift .510 .536

Lobe Ctrs 107 117

Lash Hyd

<O

</O

Rods: stock

Crank: stock

Headgasket: standard gasket that came in SpeedPro kit .041"

Intake: Edelbrock Performer (gasket matched)

Carb: 600 cfm edelbrock with electric choke (non emission)

Distributor: D.U.I

Headers: Sanderson<O

</O

Sep 7, 2007 | 09:41 PM

baddad457

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Joined: May 2003

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From: south louisiana

Your build is damn near the same specs as a 66 GT390. 320-325hp/425 ft/lbs torque.

Sep 8, 2007 | 12:17 AM

"Beemer Nut"

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From: "Islander"

410 heads were standard 390 items they should have C5 or C6 numbers for the 66-67 410 production run.
That Performer I would change to a Performer RPM if it were my motor.

Sep 8, 2007 | 05:57 AM

Lance Hogan

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Joined: Apr 2007

Posts: 528

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From: Charelston, Illinois

Beemer Nut

I do have the Performer RPM intake manifold. My mistake for not correctly listing that information. Sorry.

Sep 8, 2007 | 08:05 AM

baddad457

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From: south louisiana

For the RPM and the headers, that would add a few horses on the topend, you'd be looking at about 350 horses.

Sep 8, 2007 | 11:24 AM

Lance Hogan

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Joined: Apr 2007

Posts: 528

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From: Charelston, Illinois

Baddad457,

Thank you. Would you know what my compression ratio would be? Just wondering if I will have to run high octane fuel or E85.

Sep 8, 2007 | 02:12 PM

dffay

Elder User

Joined: Dec 2003

Posts: 531

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From: New Mexico

Seeing the power curve on a chart will show you that at 5250 rpm, horsepower equals torque. I'd be curious about rate at which your combination attains that intersection and what it looks like when it falls away. Your combo is very close to what I have in my 53. I haven't started it up yet so I'm not quite how it will work out. if someone sends you the chart, it would be great to see you post it.

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Sep 8, 2007 | 03:31 PM

baddad457

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Joined: May 2003

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From: south louisiana

Quote:

Originally Posted by Lance Hogan

Baddad457,

Thank you. Would you know what my compression ratio would be? Just wondering if I will have to run high octane fuel or E85.

I'd guess around a 9.75 to 10.0 to 1 ratio, but with that cam, you'll probably have to run 93 octane premium or back off the timing a good bit. I've had two similar builds with more cam overlap and C8AE-H heads (better quench) that had a 10.25-10.5 to 1 ratio that were fine with 89 octane and 12*BTDC initial timing. Start it off with 89 and see what it does, if it's not pinging, give it more timing till it does. If it is pinging at 12* and 89, up the octane to 93. I doubt it would ping at all with E85, but you'd have to jet the carb a lot richer to avoid leaning it out. Can't say for sure, never having run the stuff, but just going by what I know from knowledge picked up hearing about alky-hol