Who on here has a reliable program that works and is accurate? If I give you the engine numbers will someone plug them in and help me out? I have a desk top dyno, and it seems to have crashed. Im leary about buying another one to have it take a dump on me also.

Kasey

I have four or five of them ranging from $50 to $400... and after spending more hours than I really want to admit outside of a ESSA (Engine Simulation Software Anonymous) meeting "testing" them against real world results, I've lumped them all together under the category of "toys".

I honestly cant afford to blow $600 bucks to have my engine tuned on a dyno, so Im just wanting a special educated guess..

kasey

I didnt state that correctly, I meant run it, but in effect they do tune it. I just want a close hp number..

http://www.enginedesigner.com/enginedesigner.aspx

You might give this one a try. It yielded some interesting cam designs for a SS Hemi. It seemed to match what Mike Bogina told me about Hemi cams he used.

WOW,

With my cam, compression, stroke, and heads, they said my max rpm was 9600, and I have a 601hp and 510 ft/lb torque engine. NOT!!!

My engine is a 408 stroker, 300ish CFM Brodix B1BA heads, eddy torquer II intake, 10.8 comp, 850 quick fiel carb. MSD dist, MSD wires, and TTI headers. My cam is a hydro roller, Ill post a cam card.

No at all,I built a similar combo 7 years ago. I know it won't reach the RPM's predicted or the HP.Run it and have fun.

You had a similar build???

Im hopeing for at least 500lb/ft of torque, and id love 500 hp..

I have a K1 crank, and child and alberts rods with diamond pistons. It should at least be reliable.

Kasey

Same cubes and cylinder heads. The problem with this is I ran some different parts,cam,intake,etc. No one can tell you the numbers you'll get. I'd put it on an engine dyno and see what it does and be prepared to tune it. Also the tune on the engine dyno may not be best in the car. Lot's of stuff to consider,or forget.Or just put it in the car and have fun.

Well, Im sure it will out perform my current 360, Same cam, a lot less compression, and good J heads that flow in the 260's

I plan on having a lot of street fun, and get her down the quarter a few times.
Im thinking the 833 might get tossed in way of a nasty 904...
Kasey

The dyno sym program I have says you should be in the 525tq range @ 4000-4500 and 535hp @ 6000 thru 6300.
It seems a lot more accurate than Comps program.
Hope this helps.

That would be nice,

Dan at performance machine thinks 495 hp, and at least 500 torque.

Ill be happy with what I have, but of course I will always take more.

Kasey

That Schmidt Motor Works engine designer program is pretty buggy,
even if you know the harder to find parameters,
and can work around its asking for 'throat velocities' instead of the more common flow bench cfms.

On the very first run using the factory spec's of a 1995 model year Magnum 5.9V8 it gave some optimum intake manifold lengths that were 'in the ballpark' at 18.4 inches for the 2nd harmonic... but after that first run it kept reading NaN

As others have said above,
the estimated HP, torque and maximum RPM limited by piston speed
were very high compared to measured SAE values, even making allowance for AFR differences and the different camshaft specs it declares 'optimum'

Compared to the PerformanceTrends Engine Analyzer 3.2b I would consider it harder to use and less accurate.

The table of harmonics for the intake runners lengths is interesting... if it would calculate consistently and not keep giving NaN, whatever that means.

The primary pipe lengths and inner diameters of the headers seem to be in the ballpark.
The estimated EGT would be interesting to compare to the real world, but at first glance appear low.

you can't beat a price of free
but that program has major faults

Playing around with the Schmidt Engine Designer a bit more yields:

below 87% runner flow efficiency you get NaN crash

since this program 'forces' you to use their 'optimum' settings, I had to input all these Schmidt settings into the PerformanceTrends program to compare them.

Setting the Schmidt Engine Works program up with Magnum cylinder head flows of
208 cfm at 0.48 lift intake
171 cfm at 0.406 exhaust
and then forcing the Performance Trends EA 3.2B program to use the other settings
(like different camshaft and header dimensions)
that the Schmidt insisted on using,
the 'apples to apples' comparison is:

Schmidt predicts maximums of:
317 hp at 4420 rpm
357 ft-lbs at 3280 rpm

Performance Trends EA 3.2B program predicts for the same rpms as above:
312 hp at 4420 rpm
416 ft-lbs at 3280
Performance Trends predicts its own maximums of:
315 hp at 4300 rpm
425 ft-lbs at 3400 rpm

Looking at it this way
the only significant differences between the two programs are for max torque,
where the difference is 20%

This torque difference may be partly due to the
Schmidt Engine Works program just asking for for what it labels
'Unleaded Gasoline'
in contrast to the Performance Trends asking for an input of what AKI octane gasoline to use to calculate optimum ignition timing (93 octane was used ).