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Canadian Poncho Homepage -> Canadian Poncho -> General Engine Performance Forum -> 496 on the Engine Dyno
Post Info TOPIC: 496 on the Engine Dyno
davelacourse


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496 on the Engine Dyno
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They could not get the A/F ratio to not be too lean with the Demon, so we put on an 850 cfm AED carb they had, that they said runs real good ... and the fun began:

151230.jpg

My video camera malfunctioned, the second pull was a bit stronger on the high end (gave me goosebumps), but son Andy got this first pull on his phone (feel free to turn up the volume - the booth's glass door was shut):

Results:

500 ft-lbs torque from 3000 to 5500 rpm
550 ft-lbs torque from 4000 to 5000 rpm
545 horsepower at 6200 rpm

Not the 600 I was hoping for but it still should move down the road right smartly. biggrin

We had to hammer on the firewall some more to get the mock block to fit with the Cal Custom valve covers (I have 2 sets), previous fitting was with not-as-tall stock VC's and thankfully it occurred to me to try them before actual motor installation - which will be done tomorrow.

Dave

 



-- Edited by davelacourse on Wednesday 30th of December 2015 05:24:24 PM

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56Pontiac  1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod

  1964 Acadian Beaumont SD convert, 283 - factory 195 hp, Powerglide, 3.08 10-bolt - Cruiser

  2012 US-built crew cab truck - Daily Driver and Boat Trailering
2drpost


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those rear tires won't have a chance...



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koolconvertible


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sweeeet!



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cutting a roof off a four door is NOT a convertible.....

65 Parisienne convertible.one of 49 built for RHD export market,402BBC, T400, 2500 stally, posi rear, upgraded brakes with front discs, FUEL FAST efi custom built by me.
Pontiacanada


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What a beautiful sound! Glad you got the bugs out.



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Prince Edward Island

'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.

4SPEED427


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2drpost wrote:

those rear tires won't have a chance...




Nor will his driver's license have a chance...

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
JerryA


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Cool!!!  What are the cam specs ? Are those the Brodix 270cc ovals?



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427carl


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Sweet      if you convert American Horsepower to Canadian Horsepower   its  599  HP   



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davelacourse


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JerryA wrote:

Cool!!!  What are the cam specs ? Are those the Brodix 270cc ovals?

Comp Cams hydraulic roller cam:

·        Duration @ .050'': Intake - 243, Exhaust - 257

·        Valve Lift: Intake - .570, Exhaust - .554

·        Lobe Sep. Angle: 107° (very rough idle but sounds nasty)

Yes, Brodix 270cc oval port heads

Engine builder at the dyno shop says that cam is too much for those heads with my dual-plane intake

but I feel that fat mid-range torque from heads/intake, combined with top-end pull from big cam, is good ...

Dave



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56Pontiac  1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod

  1964 Acadian Beaumont SD convert, 283 - factory 195 hp, Powerglide, 3.08 10-bolt - Cruiser

  2012 US-built crew cab truck - Daily Driver and Boat Trailering
jim_ss409


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That engine sounds great.
The horsepower is nice but wait until you feel the 550 ft lbs of torque.
It's going to be fun.

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Barrie Ont.

409 powered 61 Poncho

best time 9.06@ 148 
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