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  #21  
Old 08-22-2018, 11:57 AM
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AG AG is online now
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An average of 0.415 BSFC is incredible. What A/F readings were you getting? I know my car has the best times at 12.8 A/F.

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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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  #22  
Old 08-22-2018, 12:14 PM
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Quote:
Originally Posted by Sirrotica View Post
Darby, so how fast will it push the Grandville, instead of the Firebird?...……….LOL

BTW nice numbers!!!
If I still had it, pretty damn fast ,lol

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74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #23  
Old 08-22-2018, 12:16 PM
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Quote:
Originally Posted by AG View Post
An average of 0.415 BSFC is incredible. What A/F readings were you getting? I know my car has the best times at 12.8 A/F.
They were pretty much where they were with last motor high 15 low 16, Just The BSFC Is even better on this one. He goes by EGT and how the plugs look as well, Those afr numbers aren't accurate, but he knows his dyno and knows that Doms always read high.

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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #24  
Old 08-22-2018, 12:38 PM
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Nice build!

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  #25  
Old 08-22-2018, 01:21 PM
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uh 8s Darby. Nice combo.

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  #26  
Old 08-22-2018, 03:53 PM
Dragncar Dragncar is offline
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Nice numbers Darby. I see the numbers were still climbing . Never tried any pulls past 6400 RPMs ?
Its going to be a blast your first time out at the track.

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  #27  
Old 08-22-2018, 04:08 PM
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Thanks Conrad! Troy were gonna pull it higher today , stay tuned!

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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #28  
Old 08-22-2018, 04:43 PM
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Darby, did you dyno the last motor? What size is the carb?

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  #29  
Old 08-22-2018, 05:09 PM
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NICE!
Great build! Should be a lot of fun.

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  #30  
Old 08-22-2018, 07:25 PM
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Great power.

What head flow?

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  #31  
Old 08-22-2018, 07:28 PM
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Quote:
Originally Posted by Sirrotica View Post
Darby, so how fast will it push the Grandville, instead of the Firebird?...……….LOL

BTW nice numbers!!!

our ET / MPH computed from your vehicle weight of 4500 pounds and HP of 728 is 10.69 seconds and MPH of 126.42 MPH.

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  #32  
Old 08-22-2018, 07:55 PM
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Pretty baddass "little" motor with d ports.

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  #33  
Old 08-22-2018, 08:20 PM
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Nice build Darby. Have fun

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  #34  
Old 08-22-2018, 08:34 PM
hurryinhoosier62 hurryinhoosier62 is offline
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Darby, at .415 BSFC your engine is 10-15 percent more efficient than an average high performance engine (.38-.39). Well done! Measuring EGT verses A/F ratio is a far more accurate picture of combustion efficiency. Higher EGTs = more complete combustion and more HP. What stroke are you runnIng?

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Last edited by hurryinhoosier62; 08-22-2018 at 08:43 PM.
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  #35  
Old 08-22-2018, 10:09 PM
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Quote:
Originally Posted by Scott Stoneburg View Post
Darby, did you dyno the last motor? What size is the carb?
Yes I did Scott, it made 651@6500, same carb on that motor that’s on here, my 1050 Dom.

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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #36  
Old 08-22-2018, 10:11 PM
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Quote:
Originally Posted by hurryinhoosier62 View Post
Darby, at .415 BSFC your engine is 10-15 percent more efficient than an average high performance engine (.38-.39). Well done! Measuring EGT verses A/F ratio is a far more accurate picture of combustion efficiency. Higher EGTs = more complete combustion and more HP. What stroke are you runnIng?
Thanks!! We made some more pulls today, and they were a tad higher on avg at .423 still not bad!! 4.25 stroke.

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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #37  
Old 08-22-2018, 10:13 PM
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Final numbers today! I’m pretty excited about this motor!! Plugs look Awesome for pump gas!!
Attached Thumbnails
Click image for larger version Name: DCFAFC30-E7A0-462C-B92F-73BCE7DFDF1C.jpg Views: 146 Size: 34.4 KB ID: 491227   Click image for larger version Name: 5262A467-0D38-424D-B0DC-C271D7049BED.jpg Views: 227 Size: 71.7 KB ID: 491229  

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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial

2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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  #38  
Old 08-22-2018, 10:15 PM
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Good job Darby! Great numbers.

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  #39  
Old 08-22-2018, 10:17 PM
Scott Roberts Scott Roberts is offline
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Very impressive numbers on pump gas and D ports!

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  #40  
Old 08-22-2018, 10:29 PM
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Nice job!

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