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desktop Dyno help

2K views 9 replies 4 participants last post by  Arch Stanton 
#1 ·
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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#2 ·
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.
 
#4 ·
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.
 
#5 ·
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
PM sent
 

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#9 ·
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.
 
#10 · (Edited)
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.
 
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