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09-05-2019, 08:22 PM
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#1 |
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-Chris
 
Join Date: Sep 2002
Location: Moyock, NC
Posts: 622
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Engine HP Estimator
Picking up my motor in the next few weeks to take to the dyno shop and I'm curious to see how accurate the computer programs are that I hear of. What websites do you guys use to calculate HP?
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1970 Chevy C-10 P/U, Shortbed, Fleetside - 5/7 drop, 496, TH400, 12 bolt. BUILD THREAD - http://67-72chevytrucks.com/vboard/s...d.php?t=404481 2012 F250 Super Duty P/U - intake, exhaust, tuner, 4" lift with 35's 2017 Chevy Suburban (Wifes Car) - Fully Loaded & Stock "Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem." Ronald Reagan, President of the United States; 1985 |
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09-05-2019, 09:03 PM
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#2 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
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Re: Engine HP Estimator
don't know of any websites, but I have DesktopDyno2000. Dunno how accurate it is, as I never had a motor dyno'd before.
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09-05-2019, 09:07 PM
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#3 |
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-Chris
Join Date: Sep 2002
Location: Moyock, NC
Posts: 622
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Re: Engine HP Estimator
I'm not relying on the accuracy, just curious to run my numbers to see what the computers say, then see how it compares to actual on the dyno.
Want to give it a run for me? What specs are needed?
__________________
1970 Chevy C-10 P/U, Shortbed, Fleetside - 5/7 drop, 496, TH400, 12 bolt. BUILD THREAD - http://67-72chevytrucks.com/vboard/s...d.php?t=404481 2012 F250 Super Duty P/U - intake, exhaust, tuner, 4" lift with 35's 2017 Chevy Suburban (Wifes Car) - Fully Loaded & Stock "Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem." Ronald Reagan, President of the United States; 1985 |
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09-05-2019, 09:44 PM
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#4 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,560
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Re: Engine HP Estimator
20 years ago I had a early example of desk top Dyno.
Back then the cylinder heads we're only rough approximations of figures they used. As I played with it I could get with in plus or minus 15hp of magazine builds. But one thing I took away from it was the power curve was very very good. So I used it to help determine, and learn how cam timing was the key to a solid performer. As I understand the newest versions have cylinder head flow of many brands, and you can even add your own. One thing to understand is this or even a engine Dyno can be very idealized performance. Dyno headers are worth about 10hp over chassis headers. No exhaust worth a few more, and the air velocity meter. Just has a perfect radius into the carb for maximum performance. I will eventually buy the program again to test cams digitally when I swap a cam in my Camaro, or just built a performance motor. |
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09-06-2019, 07:16 AM
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#5 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
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Re: Engine HP Estimator
They have some head flow charts n cam specs. I can try, post up what you have, no promises lol!!
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09-06-2019, 10:43 AM
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#6 |
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Senior Member
Join Date: Dec 2011
Location: Moraga, CA
Posts: 801
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Re: Engine HP Estimator
I played with DeskTop Dyno ~15 years ago, but I don't have it now.
To run it you needed the following: engine bore and stroke compression ratio cam specs: roller or not, hydraulic or not, valve lifts, valve open and close times (at 0.050 lift) head specs: valve sizes, casting numbers, whether or not they've been ported. headers or not carb CFM specs I'm sure I'm forgetting something, but that should get the guys started.
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(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340 |
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09-06-2019, 11:24 AM
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#7 | |
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-Chris
Join Date: Sep 2002
Location: Moyock, NC
Posts: 622
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Re: Engine HP Estimator
Quote:
496 BBC 11.8 compression Hydraulic roller cam Solid lifters AFR 345 heads, stock out of box 1100 CFA dominator Full length headers 259 degree intake 268 degree exhaust 110 degree centerline .707” intake .693” exhaust
__________________
1970 Chevy C-10 P/U, Shortbed, Fleetside - 5/7 drop, 496, TH400, 12 bolt. BUILD THREAD - http://67-72chevytrucks.com/vboard/s...d.php?t=404481 2012 F250 Super Duty P/U - intake, exhaust, tuner, 4" lift with 35's 2017 Chevy Suburban (Wifes Car) - Fully Loaded & Stock "Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem." Ronald Reagan, President of the United States; 1985 |
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09-06-2019, 11:57 AM
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#8 | |
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Senior Member
Join Date: Dec 2011
Location: Moraga, CA
Posts: 801
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Re: Engine HP Estimator
Quote:
__________________
(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340 |
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09-06-2019, 12:02 PM
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#9 |
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-Chris
Join Date: Sep 2002
Location: Moyock, NC
Posts: 622
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Re: Engine HP Estimator
Builder states 750. I'm really just curious what the computers say, then take it to the actual dyno. Thanks for the help!
__________________
1970 Chevy C-10 P/U, Shortbed, Fleetside - 5/7 drop, 496, TH400, 12 bolt. BUILD THREAD - http://67-72chevytrucks.com/vboard/s...d.php?t=404481 2012 F250 Super Duty P/U - intake, exhaust, tuner, 4" lift with 35's 2017 Chevy Suburban (Wifes Car) - Fully Loaded & Stock "Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem." Ronald Reagan, President of the United States; 1985 |
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09-06-2019, 03:05 PM
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#10 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
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Re: Engine HP Estimator
I’ll punch the numbers in n see what comes up.
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09-07-2019, 07:02 AM
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#11 | |
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Moderator
  
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Engine HP Estimator
Quote:
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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09-07-2019, 10:43 AM
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#12 | |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,560
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Re: Engine HP Estimator
Quote:
So you can have a engine run quite a lot longer with out cam failure issues due to fast acting ramps. It's a best of both worlds type of mod I heard about it several years ago, but it seems to be catching on a lot more now. Engine master did a episode on it. |
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09-07-2019, 11:34 AM
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#13 |
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Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 2,879
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Re: Engine HP Estimator
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Using your data with Comp CamQuest I get the following... The motor will make a ton of low end torque: CAM/HP(RPM)/TQ(RPM)/rpm range of cam -- notes XR264HR/574(5000)/678(2500)/1200-5200 -- XR270HR/589(5500)/662(2500)/1600-5400 -- likes headers, choppy idle XR276HR/598(5500)/648(4000)/1900-5600 -- needs intake, headers, gear and stall XR282HR/600(5500)/636(4000)/2200-5800 -- needs 2500 stall, improved intake manifold, headers and gears Hth, -klb
__________________
67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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09-07-2019, 12:36 PM
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#14 |
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Moderator
Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Engine HP Estimator
So they are not solid lifters as listed?
__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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09-07-2019, 01:21 PM
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#15 |
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Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: Engine HP Estimator
I wonder how much HP it'd cost you to ease the compression ratio some. There's a BIG difference in the cost of pump gas and race gas.
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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09-07-2019, 08:51 PM
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#16 |
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Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 2,879
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Re: Engine HP Estimator
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Here are CamQuest's solid-roller suggestions... CAM/GRIND/HP(RPM)/TQ(RPM)/rpm range of cam -- notes 01-708-9/312AR-10/599(6500)/548(5000)/4500-7300 -- good for super street or super gas with 4500 stall 01-712-9/296ER-08/628(6000)/598(4500)/3500-6800 -- great in super street when using heavy car, very good power band 01-710-9/322CR-10/563(6500)/505(5000)/5000-7800 -- best in super comp or super gas with 5000 stall Better have some real solid internals! Hth, -klb
__________________
67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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