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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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Old 08-22-2018, 10:11 PM
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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?
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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74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,[email protected]@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, [email protected] [email protected]
M/T 275/60 ET SS Drag Radial

2024(Pontiac 505) 1.25 60 ft, [email protected], [email protected].... 275/60 Radial Pro's
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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!!
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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,[email protected]@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, [email protected] [email protected]
M/T 275/60 ET SS Drag Radial

2024(Pontiac 505) 1.25 60 ft, [email protected], [email protected].... 275/60 Radial Pro's
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Old 08-23-2018, 09:02 AM
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455firebird1969 455firebird1969 is offline
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Final numbers today! I’m pretty excited about this motor!! Plugs look Awesome for pump gas!!
Nice build there Darby. 650 to 750 at a higher RPM I assume. What else are you changing when this motor goes in?

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Old 08-23-2018, 09:23 AM
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Nice build there Darby. 650 to 750 at a higher RPM I assume. What else are you changing when this motor goes in?
Probably his underwear after his 1st launch

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Old 08-23-2018, 09:49 AM
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Probably his underwear after his 1st launch
Possibly Bud! lmao

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74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,[email protected]@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, [email protected] [email protected]
M/T 275/60 ET SS Drag Radial

2024(Pontiac 505) 1.25 60 ft, [email protected], [email protected].... 275/60 Radial Pro's
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Old 08-23-2018, 09:52 AM
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grandville455 grandville455 is offline
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Nice build there Darby. 650 to 750 at a higher RPM I assume. What else are you changing when this motor goes in?
Peaked 100 Rpm sooner then old motor, torque was actually 1-200 higher on this bigger motor, Lenny has my numbers for the conv change. I've changed a lot on the car to help with added power I added sub frame connectors, and lost some weight to offset the added weight of the block!! It may end up a tad lighter well see.
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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,[email protected]@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, [email protected] [email protected]
M/T 275/60 ET SS Drag Radial

2024(Pontiac 505) 1.25 60 ft, [email protected], [email protected].... 275/60 Radial Pro's
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Old 08-23-2018, 03:19 PM
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461-69bird 461-69bird is offline
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Lenny has my numbers for the conv change.
Darby

if you sell your old conv pm me a price please

Rick

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Old 08-23-2018, 08:34 PM
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grandville455 grandville455 is offline
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Darby

if you sell your old conv pm me a price please

Rick
Rick, he’s already got my conv, to make the needed changes for the new motor

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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,[email protected]@117.74


2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, [email protected] [email protected]
M/T 275/60 ET SS Drag Radial

2024(Pontiac 505) 1.25 60 ft, [email protected], [email protected].... 275/60 Radial Pro's
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