[UPandComing]

so i just got my desktop dyno working this is the first time iv ever used it im surprised how simple it was to you i was expecting way more detail and information to input, any who this is what i got using the specs on the 388 stroker i just had built not to shabby if you ask me

[chevyrally68]

Hello Up & Coming nice job on your 383 stroker. I just did a build on a 327 and would like to ask if you would mind running ur desk top dyno for me on my specs if you wouldn't mind. Here are my specs

327.40 over 333 sbc
voodoo cam
Duration @ .050 (Int/Exh): 219/227
Gross Valve Lift (Int/Exh): .468/.489
LSA/ICL: 112/108
291 fuelie heads, 2.02s cast iron gm ported and polished & deshrouded
hei distributor 65,000
weiand team g single plane intake
hooker shorty headers, i know i need longer tubes in the future
flat top pistons I think CR is around 10.1 maybe a little under not to sure.
Thanks in advance if you have time!

[UPandComing]

sure ill get on it now hehe

[UPandComing]

ok i need some specifics

starting with the heads are they stock heads or aftermarket? full port polish or pocket porting?
Intake and exhaust valve size
chamber size in CC
head gasket thickness
has the block been decked?
Carb size
cam intake center line
exhaust center line
cam lobe center angle

yep thats what i need to get accurate with your application

[chevyrally68]

more specs

670 holley vac secondaries
gm 3917291 fuelie heads 2.02s/1.6 valves full port polish and deshrouded in bowls 64cc
0.028" head gasket I think??
block has been decked I am pretty sure motor is bored .40 over
cam lobe center line on intake is 108, here is the cam card to make sure I don't give you the wrong info? never done a dyno before heheh
http://www.lunatipower.com/Product.aspx?id=1983&gid=287

[UPandComing]

looking like 435HP at 6500 rpms
435 Ft lbs torque at 4500 rpms

not to shabby im assuming this is more of a driver than anything? or are you looking to do more?

[123pugsy]

Hey Up.

Does the program tell you anything other than what's on the attachments of your orignal post?

[UPandComing]

Like what specifically? Still messing with it im sure there is tons im missing

[techinspector1]

The one thing that will get you into trouble with a desktop dyno is head flow. On my DynoSim, I usually factored the flow down by some numerical value, either .9 or .95, depending on how skewed I thought the manufacturer's figures were. In other words, 250 times .9 equals 225.

You will probably find that the most benefit will be made with a free-flowing intake and exhaust system. I was able to pick up or drop off a hundred hp just by changing the intake manifold, carb and exhaust. A tuned set of headers is good for about 50 hp, an RPM intake is good for about 40 hp over a standard low-rise Performer and the more carb you give it, the higher the numbers. As long as you realize that a 600 carb will feed 90% of the 350's out there, you'll be ok.

[chevyrally68]

Up & Coming,
Thanks for your time and I can't believe it is making that much hp? I thought around 325-350hp max, hopefully someday I can do a chassis dyno for exact numbers in real time. Thanks you for giving me some insite into my curiousity. Sorry vague on some of the specifics. What are the cam specs for a original 327 rated at 375hp back in the day?

[techinspector1]

Originally Posted by chevyrally68

What are the cam specs for a original 327 rated at 375hp back in the day?

L76 (365hp) and L84 (375hp) used the same Duntov "30-30" cam, 0.484" / 254 @0.050" / 114 degree lobe separation angle. There was one heck of a lot of clearance ramp on these cams, so they were not as radical as it may appear. I didn't find the advertised duration, but if I were to guess, I'd add 70 degrees to the 254, for an advertised duration of around 324 degrees. The motors using these cams were rated at the factory to 11.0:1 static compression ratio, but my guess is that they were closer to 10.0:1 or a little more in reality.

[UPandComing]

Lol tech is the king of this stuff guys im still an amature in comparrison to him and by no means do i kno everything but i learn lots here, tech does ur dyno sime have more advanced input compaired to mine bc there is a whole bunch of things my engine has going for it that i couldnt input

[techinspector1]

The DynoSim 4.2 is on my computer in Phoenix. I'm currently living in North Carolina and have no dyno software on this, my daughter's computer.

If I were to purchase a system today, it would be these two discs...
http://www.proracingsim.com/dynosimmainpage.htm
http://www.proracingsim.com/camdiskmainpage.htm

The additional 6000 cam profiles will be of great help to you when you need to try 6 or 8 different grinds to find the sweet spot in a given combination.

[123pugsy]

Originally Posted by techinspector1

The DynoSim 4.2 is on my computer in Phoenix. I'm currently living in North Carolina and have no dyno software on this, my daughter's computer.

If I were to purchase a system today, it would be these two discs...
http://www.proracingsim.com/dynosimmainpage.htm
http://www.proracingsim.com/camdiskmainpage.htm

The additional 6000 cam profiles will be of great help to you when you need to try 6 or 8 different grinds to find the sweet spot in a given combination.

Hey Tech.

It would be a good chance to check out the free 10 day trial of the Engine Analyzer Pro. I've used it on both my work and home computers and I'm out of IP addresses to get it again.
I would really appreciate your input to the quality of this program compared to the Desktop Dyno stuff as I do want to buy something soon.

Analyser