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#1
06-20-2021, 01:47 PM
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Dyno day coming Thursday
I finally got my dyno day set up. If nothing happens it will be Thursday the 24th. 2 things have to happen to make it successful, 1st.--Hopefully it comes home in 1 piece. 2nd.-- I'm hoping for 800+ HP. I wont be taking my 1250 Dominator like I planned because there was trouble getting it to act right when i had it running on the stand. So I will be using my 1050 I used on my previous 474. We will see how it shakes out.
Build Specs. 535. IA II block 4.5" Forged Scat crank 6.7 " Scat Rods Diamond pistons with 17CC dish/reliefs CamMotion SR cam. 276/284 @.050, .450/.455 lobe lift. 113 LSA CV1 Heads max flow 403 @.750 lift CV1 Low rise intake. Proted to match heads 1050 Dominator. I have to take my own headers, i have the 2" headers that I will use on the car, i also have a set of stepped 2-1/"8"to 2-1/4" headers that were built for a chassis car. I will use whatever set fits best on the dyno I will try a 1" tapered spacer as well as a 1" open spacer. Probably try them together too depending on time. The plan is to work on jetting, timing ( starting at 28*) and carb spacers to see what it likes. |
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#2
06-20-2021, 01:56 PM
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what rocker and compression? i think you will make a fair amount more than 800 even with the little headers. you have a fancy intake or the cast low rise?
__________________
1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
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#3
06-20-2021, 02:43 PM
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Quote:
Rockers are Harland Sharp 1.8 shaft system. Compression is 11.75 to 1. The intake is the low rise "X" manifold. Not the "R" tall 2 piece manifold but better than the standard low, rise from what i hear. I will be really happy with over 800. My current 474 was aprox 700 at the flexplate according to Wallace Calcs |
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#4
06-20-2021, 03:21 PM
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Good luck! Id bet it exceeds your 800hp goal with ease
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#5
06-20-2021, 03:31 PM
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I agree over 800 for sure. probably close to 900.. Good luck..
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#6
06-20-2021, 05:44 PM
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Good luck!
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#7
06-20-2021, 05:55 PM
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750 with current cam.850 with 20 degrees more duration
__________________
76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
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#8
06-20-2021, 06:27 PM
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Quote:
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#9
06-20-2021, 06:30 PM
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Good luck.
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#10
06-20-2021, 08:16 PM
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Quote:
Increasing the duration @ .050 by another 20 degrees on this cam probably would make more power, but we'll see what can be done as is. |
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#11
06-20-2021, 08:18 PM
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Quote:
Intake 2.20 Exhaust 1.80 |
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#12
06-21-2021, 03:57 AM
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Good luck, 800+ is in the bag IMO.
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#13
06-24-2021, 11:32 AM
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Not a terrible day, but not exactly what i was hoping for. It made good power, happy with those results but I broke a rocker shaft stand and damaged 2 rockers. 794 HP @6700 & 697 TQ. @ 5000. I'll post the sheet when I get home.
I didnt get to play with carb spacers or jetting. Only tuning changes were timing. We made 4 hard pulls after the initial 2 low rpm pulls to warm it up. |
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#14
06-24-2021, 12:11 PM
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Well dam, sorry to hear you had a bit of trouble. Such a worry when you dump so much money into these engines.
Our 505 made 789 hp and 700 torque corrected to sea level on the dyno. I thought you would have made higher. |
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#15
06-24-2021, 01:42 PM
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I think It may have made a little more with some carb tuning. But i can't be sure because we didnt get to. The 1050 Dominator is jetted for my 474. Also wanted to test a couple diferent spacers. Looks like I'll end up doing that on the track after I get new rockers. In not concerned about the breakage, it sucks but at least it wasnt the bottom end...lol..
We made 4 pulls 2 of the pulls had 701 TQ and 793-794 HP. But this is the only print out. Best power at 30* timing. 34* dropped the pier to 685 HP. Last edited by Scott Stoneburg; 06-24-2021 at 02:17 PM. |
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#16
06-24-2021, 02:22 PM
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Good job! Always a bummer to break stuff but atleast it was nothing catastrophic.
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#17
06-24-2021, 02:53 PM
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Scott,
Sorry to hear about your problems. Is it possible to have the dyno operator email you the Super Flow Data files? I have printed those out for some people and also exported the data so they could import the data into Excel. Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#18
06-24-2021, 02:56 PM
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Wonder if 4 additional degrees could drop over 100HP?
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#19
06-24-2021, 04:58 PM
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Quote:
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#20
06-24-2021, 04:59 PM
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Quote:
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