Dyno 2000 Camshaft Possibilities For 396

19Brookwood60

19Brookwood60

Member
Just been using dyno 2000 for a cam selection for a engine I am currently using.
It results in some good HP and Trq but am unsure if the torque curve is too steep.
Engine is a 396 BB Edelbrock Tunnell ram, 2 predator carbs, 11.1 comp. Mildly ported open chamber heads.
Solid Roller.
Camshaft Lift 0.780 in 0.740 ex
273 in dur. 313 ex dur.
IC 111', Lobe Center 118'
HP 695 @7500
Trq 581 @5000
I will try add a photo of the dyno results.
I will be looking at AFR oval port heads to suit the cam I end up with.
Thanks
Chris
 

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  • 396 Cam Results.JPG
    396 Cam Results.JPG
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Id suspect theres a serious flaw in the data being input ,at some point
making 695 hp and 581 tq out of an 11:1 compression 396 ,
without nitrous or a turbo boost in intake pressure,
and 125% volumetric efficiency at 6000 rpm.
. is rather unlikely
especially with that 273 in dur. 313 ex dur.
IC 111', Lobe Center 118' cam timing
those numbers look more like a 496 BBC
why not post all the input data you used,
too look at?


396 /8= 49.5/2.19=22.6= 105 lca as most efficient,
I don,t know what heads your looking at , but near 700 hp will require about a 370 cfm head flow minimum.
https://www.summitracing.com/parts/afr-3680


AS your displacement per cylinder increases the effective valve size per cubic inch decreases so you need a slightly tighter LSA and these charts should help.
http://www.wallaceracing.com/calcafhp.php
0607phr_11_z+camshaft_basics+lobe_centerline_angle_determination_chart.jpg
 
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Rick has the best Desktop Dyno and latest version here.
I have DD2000 On my laptop I use.
It still works.
It wont super accurate with modern ultra high output engines.
Accurate 300-1000 Hp it is.

I need IVO, IVC, EVO, EVC To accurate engine simulate.
I don't like simulation with advertised numbers. Results skewed and way to high.
 
BB Custom 118LSA.JPG BB Custom 107LSA.JPG
Grumpy said:
Id suspect theres a serious flaw in the data being input ,at some point
making 695 hp and 581 tq out of an 11:1 compression 396 ,
without nitrous or a turbo boost in intake pressure,
and 125% volumetric efficiency at 6000 rpm.
. is rather unlikely
especially with that 273 in dur. 313 ex dur.
IC 111', Lobe Center 118' cam timing
those numbers look more like a 496 BBC
why not post all the input data you used,
too look at?


396 /8= 49.5/2.19=22.6= 105 lca as most efficient,
I don,t know what heads your looking at , but near 700 hp will require about a 370 cfm head flow minimum.
https://www.summitracing.com/parts/afr-3680


AS your displacement per cylinder increases the effective valve size per cubic inch decreases so you need a slightly tighter LSA and these charts should help.
http://www.wallaceracing.com/calcafhp.php
0607phr_11_z+camshaft_basics+lobe_centerline_angle_determination_chart.jpg
Click to expand...
 
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Torque and Hp cross over at 5252.
That is right.
I will DD2000 Your combo myself soon.

If Rick is around he can use his latest Desktop Dyno Simulation.
Has all the bells and whistles.
 
I will need those cylinder head flow numbers and the manufacture / model # to get good HP/TQ numbers.
 
I think he has The production Chevrolet BB Oval port heads #781 Castings Rick.
They are good heads to use.
A Few cracked 750 Hp N/A with them on the Big Chevy Performance group I am on.
Poor mans Hp !

I will look for flow numbers on Stan Weisses site.
 
The 427 Tall Deck 1968-1983 flow similar to 781's but a hair less the Big Chevy guys told me.
Like that 427 TD BBC I have put away still for 496 BBC Race engine someday.
 
Let's make sure of which heads 19Brookwood60 is using. I don't want to muddy the waters with incorrect data and have to go back and correct something. Plus I have more questions first.

- Again, which heads and the flow number if you know them?
- Rod Length?
- Camshaft Manufacture and Part Number?
- What are the numbers at .050 inches of lift?
- Which combustion chamber best fits your heads, see graphic below?

CombustionChamberDesign.JPG
.
 
The heads are a closed wedge 113cc Casting no. 6272292.
Used to have the flow details 30 years ago but I have lost them. Had minor port work and bowl cleanup.
Conrods are std 6.135"
Will more than likely go for the 265 AFR Heads when funds permit. https://www.summitracing.com/int/parts/afr-3620-1/overview/make/chevrolet
There is no camshaft number or brand, as this was a cam I have been developing over the past year or so.
Havent heard of many people saying they can make decent HP out of a 396. 450hp seems the normal out there but I think thats a bit lame for such a good framework of an engine.
 
Depends what You want.
It's a past NHRA Super Stock engine used a 396 BBC.
A Few have cracked 700-750 Hp with them factory heads and full Race cams.
496 BBC always done here by Grumpy.
To build it you have to scrap your entire 396.
Only the Tunnel Ram will be used.
 
a turbo 396 BBC has a great deal of potential , with a strong block,
strong forged crank in some versions,and room to have the head gasket seal well between cylinder walls,
using the OEM block crank and ported heads,
pistons and almost all OEM bbc chevy connecting rods,
originally used in any 396 would be replaced with far stronger aftermarket components,
650-800 plus would be easy if the wallet could handle the stress,
but someone will point out that that a 427-454 could be built to provide even better power
 
19Brookwood60 said:
The heads are a closed wedge 113cc Casting no. 6272292.
Used to have the flow details 30 years ago but I have lost them. Had minor port work and bowl cleanup.
Conrods are std 6.135"
Will more than likely go for the 265 AFR Heads when funds permit. https://www.summitracing.com/int/parts/afr-3620-1/overview/make/chevrolet
There is no camshaft number or brand, as this was a cam I have been developing over the past year or so.
Click to expand...
Since we don't have flow data, I would prefer to use the AFR heads so I can get the flow data.

The reason I ask for Manuf and PN is I have a library of 39 cam files. If I already have what someone is
using it's much easier for me to load it from my library. If I don't have it, then I want to create my cam
file so I don't have to ever do it again for that cam. I have also saved over 100 cam cards over the years
that makes it easier when I do have to create the cam file. Just trying not to build the wheel over and over.

I'm working on the sim now.
 

heres a set of stock oval ports after port work,
you can use as about average,
for the better cast O.E.M. stock muscle car era,
cast iron oval ports with some port & bowl clean up,

Lift Intake Flow (CFM)
Oval PORT
.100" 73
.200" 140.2
.300" 211
.400" 273.2
.500" 302.8
.600" 315.3
.650 313.8
.700"311.1


Lift Exhaust Flow (CFM)
Oval
.100" 60.8
.200" 107.7
.300" 139
.400" 165.2
.500" 186.4
.600" 202.3
.650" 208.4
.700"216.5-


https://www.airflowresearch.com/content/catalog.pdf

heres the 265 afr heads
265afrt.png


heres what I would use.. 300cc afr oval port heads

300afrt.png
 
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19Brookwood,

Sorry I didn't ask above, but I'm going to also need the valve timing events at .050 inches.
 
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