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post #1 of 10 (permalink) Old Feb 21st, 17, 08:09 PM Thread Starter
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Luigi
 
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desktop Dyno help

Hey guys, wondering if there is a free online desktop dyno or if someone can give me a ballpark figure with horsepower on my setup

rebuilt 355 short block, factory deck
new 4 valve relief dished pistons, NOT the deep dish pistons but almost flat top looking
new bearings + rings etc

Summit Vortec heads
175cc intake, 67cc combustion chamber
0.26 head gaskets coming to around 9.3:1 compression ratio

Summit 1103 cam installed straight up with 1.6 roller rockers
288/298 advertised duration, 214/224 @.50, .473/.496 lift with the rockers, 112 lobe sep.

High Rise polished Vortec intake
1980 Corvette Quadrajet
Flo-Tec 1-1/2" primary tube ceramic headers
HEI distributor, 8mm wires

I've been searching for a desktop Dyno with no luck

Thanks
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post #2 of 10 (permalink) Old Feb 21st, 17, 10:41 PM
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John
 
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Re: desktop Dyno help

354 h.p at 5000
430 lb./ft. at 3500.

This is plugging in a 750 cfm carb, btw.
Plugging a 800 cfm or a 600 cfm only gained/lost a few hp and tq either way.
Graph shows no use revving engine past 5000. Power is all done.

- John
Misfit tortured soul. Lone wolf. Unicorn.
'67 V8 Camaro - 12637, 797-Z (Parchment), M-M (Royal Plum), 2M, 3K, 5Y
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post #3 of 10 (permalink) Old Feb 22nd, 17, 12:14 AM Thread Starter
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Luigi
 
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Re: desktop Dyno help

Thanks John!!

thats awesome!!! thats what I was hoping for!!

The Quadrajet is a 750 CFM and I'm not planning on running that high rpm.

Probably with a roller cam upgrade, better headers and a Holley double pumper I can probably crack 400 !!!!!
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post #4 of 10 (permalink) Old Feb 22nd, 17, 07:57 AM
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Re: desktop Dyno help

Quote:
Originally Posted by Arch Stanton View Post
354 h.p at 5000
430 lb./ft. at 3500.

This is plugging in a 750 cfm carb, btw.
Plugging a 800 cfm or a 600 cfm only gained/lost a few hp and tq either way.
Graph shows no use revving engine past 5000. Power is all done.
Hey John, would you mind taking a stab at mine?
461 big block chevy 10.5 to 1 compression
270 cc Brodix aluminum oval port heads
Cam : Lift intake.595 / exhaust .612
Duration: @.050 intake 242 / exhaust 252
Advertised duration: intake 300 / exhaust 310
1.7 roller rockers
Weiand stealth intake
1000 hp Holley mechanical secondary carburetor
Headers 2" primary tubes 3 1/2" collectors
Full MSD ignition.

Thanks.
Matt.

1969 SS Garnet Red X55 350 Factory 4 speed
12 Bolt 3.55 Posi
461 BBC TKO600
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post #5 of 10 (permalink) Old Feb 22nd, 17, 02:12 PM
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Don
 
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Re: desktop Dyno help

Quote:
Originally Posted by 68barnfind View Post
Hey guys, wondering if there is a free online desktop dyno or if someone can give me a ballpark figure with horsepower on my setup


I've been searching for a desktop Dyno with no luck

Thanks
I have both
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post #6 of 10 (permalink) Old Feb 22nd, 17, 11:17 PM
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John
 
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Re: desktop Dyno help

Quote:
Originally Posted by Matt 69 View Post
Hey John, would you mind taking a stab at mine?
461 big block chevy 10.5 to 1 compression
270 cc Brodix aluminum oval port heads
Cam : Lift intake.595 / exhaust .612
Duration: @.050 intake 242 / exhaust 252
Advertised duration: intake 300 / exhaust 310
1.7 roller rockers
Weiand stealth intake
1000 hp Holley mechanical secondary carburetor
Headers 2" primary tubes 3 1/2" collectors
Full MSD ignition.

Thanks.
Matt.
I didn't have a file for those heads, so I plugged in Edelbrock Performers instead.
More complete cam specs would help too, but I plugged in the @ .050 specs given.
Specific bore and stroke would help too.
But
I got out:
570 h.p. at 6000
585 tq at 4500
Very nice looking graph for power delivery.
That might get you sorta in the ballpark for that setup.

- John
Misfit tortured soul. Lone wolf. Unicorn.
'67 V8 Camaro - 12637, 797-Z (Parchment), M-M (Royal Plum), 2M, 3K, 5Y
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post #7 of 10 (permalink) Old Feb 23rd, 17, 05:02 AM
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Matt
 
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Re: desktop Dyno help

Quote:
Originally Posted by Arch Stanton View Post
I didn't have a file for those heads, so I plugged in Edelbrock Performers instead.
More complete cam specs would help too, but I plugged in the @ .050 specs given.
Specific bore and stroke would help too.
But
I got out:
570 h.p. at 6000
585 tq at 4500
Very nice looking graph for power delivery.
That might get you sorta in the ballpark for that setup.
Thank you John. The actual bore is 4.280" and the actual stroke is 4.0". The cam is Lunati pn. 50250 . I forgot to tell you the lobe separation,which is 110 degrees. Thank you for helping me out John!

1969 SS Garnet Red X55 350 Factory 4 speed
12 Bolt 3.55 Posi
461 BBC TKO600
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post #8 of 10 (permalink) Old Feb 23rd, 17, 09:05 AM
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John
 
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Re: desktop Dyno help

Looking up the Lunati cam, adjusting for a roller,
it actually lost a little hp, but picked up a little tq.
550 hp at 5500
591 tq at 4000

- John
Misfit tortured soul. Lone wolf. Unicorn.
'67 V8 Camaro - 12637, 797-Z (Parchment), M-M (Royal Plum), 2M, 3K, 5Y
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post #9 of 10 (permalink) Old Feb 23rd, 17, 10:14 AM
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Matt
 
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Re: desktop Dyno help

Thanks John. Those numbers definitely satisfied my curiosity. Sorry, I forgot to mention the cam is a hydraulic roller. The motor made 447 hp. And 458 ft.lbs. of torque at the rear wheels on the chassis Dyno. They work out to be pretty close to a 20 percent loss through the drivetrain. That desktop Dyno is pretty accurate. Thanks again for running my combination for me.

1969 SS Garnet Red X55 350 Factory 4 speed
12 Bolt 3.55 Posi
461 BBC TKO600
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post #10 of 10 (permalink) Old Feb 23rd, 17, 10:36 AM
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John
 
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Re: desktop Dyno help

Actually, I got curious, I looked up the flow numbers on Brodix's site.
Adjusted for the heads, all else the same as before.
It came down a bit. Now a wavy shaky looking graph.
540 hp at 5500
530 tq at 5000.
Sorry.
I got curious since you gave me dyno numbers.

- John
Misfit tortured soul. Lone wolf. Unicorn.
'67 V8 Camaro - 12637, 797-Z (Parchment), M-M (Royal Plum), 2M, 3K, 5Y

Last edited by Arch Stanton; Feb 23rd, 17 at 10:41 AM. Reason: Added last sentence.
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