Author Topic: Guess the horsepower on a little pepped-up 390....  (Read 26289 times)

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TomP

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #15 on: November 24, 2018, 07:01:55 PM »
TunnelWedges are indeed cool.

I will guess 558hp at 6800rpm.

6667fan

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #16 on: November 24, 2018, 07:31:09 PM »
You are messing with us.....and I like it. No cubes, no stroke, lots of cam/compression.
567 uncorrected @6700.
JB
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Drew Pojedinec

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #17 on: November 24, 2018, 07:34:34 PM »
Lemme know when you are going to dyno. I’ll lend you a set of 660’s if I have any laying around.

Gregwill16

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #18 on: November 24, 2018, 07:41:16 PM »
555hp @6500rpm

1973MoneypitFE

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #19 on: November 24, 2018, 08:45:04 PM »
575 hp @ 6300 rpm
« Last Edit: November 26, 2018, 07:35:20 AM by 1973MoneypitFE »

temarey

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #20 on: November 24, 2018, 09:23:18 PM »
560 horsepower   6550 rpm

WerbyFord

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #21 on: November 24, 2018, 10:27:22 PM »
OK here is what the Gonkulator is getting for this torque monster (cam is 7 degrees advanced so I'm calling it a torque monster)
I'm also assuming the same 2" headers your dyno usually runs? Torq is sensitive to the whole exhaust setup, power not so much.

SAE GROSS, 60F 29.92 dry air
Torq 496 at 4800
Powr 574 at 6900

Same except retarded 4 degrees to 114 LSA, 111 ICL
Torq 501 at 4900   +5
Powr 593 at 7000 +19

I don't know how to "uncorrect" SAE gross numbers without guessing the weather - I have your altitude at 750 ft, so will guess a "winter" correction factor of say 1.04. So using that 107 ICL cam, knocking 4% off these numbers gives:
Torq 477 at 4800
Powr 552 at 6900
So these last numbers are my guess per the rules. If I win those rockers I'll need a lot bigger cam, and then heads that can use that extra lift, and then rods that will handle the rpm, and bigger exhaust, and electric cutouts, and, oh, too much to handle right now.

Will those rockers work on the Model A Ford? (that was a joke for you young folk out there!)

Eric Hardesty

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #22 on: November 24, 2018, 11:35:49 PM »
  Those are some good numbers for iron heads. Hopefully, you
will spin it to 7500, that is about where it will peak.  545 uncorrected.

blykins

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #23 on: November 25, 2018, 07:10:10 AM »
OK here is what the Gonkulator is getting for this torque monster (cam is 7 degrees advanced so I'm calling it a torque monster)
I'm also assuming the same 2" headers your dyno usually runs? Torq is sensitive to the whole exhaust setup, power not so much.

SAE GROSS, 60F 29.92 dry air
Torq 496 at 4800
Powr 574 at 6900

Same except retarded 4 degrees to 114 LSA, 111 ICL
Torq 501 at 4900   +5
Powr 593 at 7000 +19

I don't know how to "uncorrect" SAE gross numbers without guessing the weather - I have your altitude at 750 ft, so will guess a "winter" correction factor of say 1.04. So using that 107 ICL cam, knocking 4% off these numbers gives:
Torq 477 at 4800
Powr 552 at 6900
So these last numbers are my guess per the rules. If I win those rockers I'll need a lot bigger cam, and then heads that can use that extra lift, and then rods that will handle the rpm, and bigger exhaust, and electric cutouts, and, oh, too much to handle right now.

Will those rockers work on the Model A Ford? (that was a joke for you young folk out there!)

Werb, the rockers will work with any setup, no need to upgrade.  :)

It's mainly my fault for not getting you comparative info to enter, but there are certain situations where advanced cam timing actually makes more horsepower.  I believe this engine is one of those situations, mainly based on the fact that it's a little engine pulling on a big intake manifold.  Gotta make velocity.  I had it ground with 8 degrees advance and it came in +7, so I left it alone.  The issue with FE hydraulic roller camshafts is that the advertised durations are very large, which makes for a ton of overlap.  Gotta pull hard on the top end to keep the charge going in the right direction.  RPM helps of course....

I hope you're right on your calculations.....those numbers would make me happy.  I'm not really out to make big horsepower, I'm out to twist the gonads off of a hydraulic roller FE.
« Last Edit: November 25, 2018, 07:14:35 AM by blykins »
Brent Lykins
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blykins

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #24 on: November 25, 2018, 07:11:36 AM »
Lemme know when you are going to dyno. I’ll lend you a set of 660’s if I have any laying around.

Drew, I've got these 600's, and I've got a set of QFT 725's that I have earmarked for a 465.  I was thinking of swapping them, if anything, just to make sure the 725's will be right for a flat-tappet break-in startup.  I'll probably make a power pull with them as well.
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
Instagram:  brentlykinsmotorsports
YouTube:  Lykins Motorsports

Drew Pojedinec

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #25 on: November 25, 2018, 07:53:53 AM »
Very good. It’s nice to have some to swap around, especially a component that unbolts so easily.

wayne

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #26 on: November 25, 2018, 11:51:32 AM »
530 at 6800 is my guess

cjshaker

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #27 on: November 25, 2018, 01:58:38 PM »
Going by the rules of the game, and how I got screwed last time, my guess is:

505 @ 6500

Edit to add a more serious guess.
« Last Edit: December 01, 2018, 12:53:53 PM by cjshaker »
Doug Smith


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My427stang

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #28 on: November 25, 2018, 03:19:31 PM »
You are going to get screwed again if you don't play the whole game and add an RPM to that guess :)


I'll even add another incentive:  if anyone guesses the exact horsepower and the exact peak horsepower rpm, they will receive a free set of my new non-adjustable roller tip rocker arms. 

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- 71 F100 shortbed 4x4, 461 cid FE, headers, Victor Pro-flo EFI, Comp Custom HFT cam, 3.50 9 inch

shady

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Re: Guess the horsepower on a little pepped-up 390....
« Reply #29 on: November 25, 2018, 04:04:25 PM »
Going by the rules of the game, and how I got screwed last time, my guess is:

492
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