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Old 08-15-2006, 03:21 PM
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Computer dyno pump gas 434

Hi, we (my dad, brother and I) just had our 358 torn down, and are thinking about building a pump gas 434 out of it, and I am just curious what one of those computer dyno simulators would say for hp. Below is roughly the specs of the motor. I am not sure all that you need or can use, but I can pretty much give you any info that you want.

434
10.8:1
solid roller cam 260 @.050 650 lift 112 lsa
Brodix 11X heads ported 230cc runner, max flow around 310 cfm int 240 exh
holley HP 950 carb
super victor intake port matched to heads


Is there any more that you need or can use?

Thanks,
Adam

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Old 08-15-2006, 03:50 PM
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Refresh my memory, what is the bore and stroke?

I found it, 4.155x4.00
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Old 08-15-2006, 03:58 PM
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Quote:
Originally Posted by firestone
Hi, we (my dad, brother and I) just had our 358 torn down, and are thinking about building a pump gas 434 out of it, and I am just curious what one of those computer dyno simulators would say for hp. Below is roughly the specs of the motor. I am not sure all that you need or can use, but I can pretty much give you any info that you want.

434
10.8:1
solid roller cam 260 @.050 650 lift 112 lsa
Brodix 11X heads ported 230cc runner, max flow around 310 cfm int 240 exh
holley HP 950 carb
super victor intake port matched to heads


Is there any more that you need or can use?

Thanks,
Adam
Bore, stroke, rod length, piston type, ring type, bearing type
any accessories like water pump, fan, power steering, etc
oil pan configuration, windage tray? crankcase vacuum pump? wet sump?
Head type, specifications, modifications, flow numbers if possible, valve sizes, compression ratio
Intake type, modifications, runner length if possible, carb type and cfm
Exhaust system configuration and dimensions
Primary tube size and length, collector size and length, crossover? X-pipe?
Muffler cfm and size
Cam and lifter type, advertised duration, duration @.050, lobe lift, intake lobe installed centerline, lobe separation angle, rocker arm type and ratio
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Old 08-15-2006, 05:18 PM
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Some of this is not set in stone, but is my best idea at this point

bore: 4.155"
Stroke: 4"
Rod length: 6"
Piston: Forged JE flat top, -5cc valve releif
Rings: total seal gapless
bearing: Clevite 77
Assume no accessories at this point
Assume a standard pan (also that clearance is ok) no windage tray, no vacuum pump with a standard wet sump oil system.

Head:
11X, 23 degree, 230cc runner, fully ported, 2.10 1.60 vlaves 76cc chambers
--The heads have been ported and flowed but have had more porting since then. Before the extra porting, they flowed very similar to the AFR 227cc heads at lower lift, but not quite as much on the top end. For ease, I would now use the numbers for the AFR 227cc comp heads.
http://www.airflowresearch.com/227sbc_rh.php

intake: Fully ported and port matched edelbrock super victor, dont know runner length

carb: holley hp 4150 950cfm mech secondary

exhaust:
hooker ceramic coated super comp full length tuned headers 1 7/8" primary into 3" exhaust with a cutout, so no muffler or cross over at this point.

All of the exact cam dimentions have not been sorted out, so I will go off of a comp cam that I think will be similar:

type:solid roller
Advertised duration: 292 297
duration @.050: 254 260
lobe lift: .388 .392
LSA: 110
intake lobe centerline: use 106
Rocker: this may not be what I use, but assume comp high tech 1.7

Thanks
Adam
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Old 08-15-2006, 05:29 PM
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Virtual Engine Pro says 562 hp@6750 and 499 ft/lb@5250
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Old 08-15-2006, 05:43 PM
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Thanks, any others?

Adam
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Old 08-15-2006, 08:10 PM
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My pump gas street/roadrace motor:

432 cid
9.6:1
4.145 x 4.0
Rocket tall deck block
6.25 rod
AFR 220 2.08/1.6
Solid roller 264/272 @.050, .688/.666, 106 LS
Super Victor
Stealth Racing Carbs Holley HP 1.59 venturi w/annular boosters
4-stage drysump pulling vacuum


640 HP @ 6100, 609 TQ @ 4900 on engine dyno
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Old 08-15-2006, 09:08 PM
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Thats awsome. I was hoping for something in the 650 range, so your motor is encouraging. Are your AFR 220's the comp heads?

Adam
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Old 08-16-2006, 07:45 AM
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Quote:
Originally Posted by firestone
Thats awsome. I was hoping for something in the 650 range, so your motor is encouraging. Are your AFR 220's the comp heads?

Adam
Yes they are.

Scott
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