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how much horsepower and torque does my motor make
chevy 383 stroker
steel crank
10:1 hypereutectic pistons
comp hyd. lift cam ink.480 exhaust.480 tappet lift 280 duration at .050 231
double hump heads 64cc 202ink 1.60exh open chamber
roller rockers
elderbrock jr victor alum. intake
650 holley double pumper
hei ignition
hedders
3000stall 350 turbo 411 posi rear
I would guess with a good tune it would be capable of making 400 hp.Quote:
Originally Posted by chriswhite
This was assuming hyd lifters and open headers
The problem with some of the computer software is it does not give you the ability to input all the data unless you have the software that costs over $1,000 dollars.Quote:
Originally Posted by viking
In the 60's some of the factory 327's did 350 hp.
This was with a cam that was .447/.447 and duration at .050 was 222/222.
Also the intake manifolds have come a long way in 35+ years.
So he has a 383 which is 56 cubes larger than the 327 a larger cam with .480/.480 lift and a duration at .050 of 230/230 and better induction.
I.M.O. this would put him right at 400 hp.
O.K. next dyno sim with the "cheap" (sorry Mr.Gasket) software, the changes were displacement dropped to "327" and lift to "447" all other fields, Heads, comp, induction and exhaust were left alone.
Notice the Vol eff goes up (as does the HP ), this leads most to believe that these heads are flowing better with this smaller displacement (I believe these heads were designed for a 327) than they are with the 383, with out a doubt the 383 would benefit greatly from better flowing heads.(which can be compared with this software along with all other paramators)
The 383 of course wins the torque war in this sim and seat of the pants real world feeling.
When I post these sim generated graphs it is to pass alone the best info I can come up, use it how you will, or mock it as you may.
Quote:
Originally Posted by chriswhite
Erik, he said it had 280 degs @ .050.....not 230. Could be a typo or I could be mis-reading it (thinking the 231 was a type of SBC head) ? Should it be read as 280adv, 231@.050 ?:confused:
That would change your numbers quite a bit I would think...(if it was indeed 280@.050)
Your cam figures were correct the first time--it has 280 degrees duration and it is 230 @ .050. It is CompCams 280 Magnum cam, and I run that one in my 383.
This is great coming from a guy that thinks I gave him "mis -information "about a 400 sbc.Quote:
Originally Posted by viking
A dyno sim is a tool and it won't work correctly un-less you have all the correct imformation and even then it will give questionable results.
I will take my dyno or flowbench or lap times or E.T's any day over a "sim".
There is a reason they call it a "simulation".
Keep in mind that 383 may make only 400HP, but with a small 165cc intake runner on the camel hump heads that motor will be making a load of torque. Probably 450+ torque.
Quote:
Originally Posted by erik erikson
I agree 1000% with you, but since I don't own a dyno or flowbench yet (come on lottery) and can't afford to swap real world parts at will and head out to the track, I figure the sim method is my best bet to make a educated guess at which mods will add the best bang for the buck.
As for the 400's, maybe I've just had better luck with them than most (no over heating issues) , or maybe I have'nt pushed em hard enough to blow one yet, all I can say is on mild hop up's they allways beat the 350's built the same way.
I will agree with what you said on mild hop ups due to the 4.125 bore x the 3.75 stroke.Quote:
Originally Posted by viking
I agree with the above the virtual dynos will never get a exact value like a true dyno run, but they have their advantages. I simulated the whole engine in under five minutes to get a good approximation of power output.
I have put hundreds of engines on a real dynos (SF-800 and SF-901) and it takes hours to get the engine bolted up, started and the run-in. And that doesn't even count the time (and $$$) to change out parts. I can do all this in minutes on a virtual dyno.
With your combo, the hydraulic camshaft and 650 cfm carb will keep you from crossing the 400hp mark. I was not sure of your lobe seperation, I guessed 108 degrees.
Pretty large bore there, 406.7ci
Erik, when I type in my ZZ502/502 (unported, stock cam) it matches real darn close.
My useage has revealed to me that the (even baseline) sims these days ain't that bad. In general I would say within 5%-10% across the board. In most cases less than 5% error from reality.
Physics is just physiscs after all ......................
Kitz
Put a set of the new AFR 195 heads and a 750 cfm carb on it and watch it light up! Gobs of power made with a small cam.