Anyone Know of Online Engine Dyno Software so I Can Test a Few Combos?

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Rocket

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I want to run a few scenarios to see the potential of an engine I would like to build. Are there programs available that will provide a reasonable estimate so I can determine what type of cam, compression, carb I will need?

Thanks
 
You can download camquest from comp, but you can only choose from their cam profiles...unless you do some tweaks.
 
Thanks for the suggestion. I tried it and it is easy to use. I was not able to change the bore and stroke however. It only let me select stock engine displacements. Is there a way to adjust the bore and stroke? If not are there any programs out there on the web that will allow more tweaking of engine specifications?
 
Those things are WAY off.......you would be better off posting what you are going to run and have us guess what it will make!:-D
 
Rocket said:
Thanks for the suggestion. I tried it and it is easy to use. I was not able to change the bore and stroke however. It only let me select stock engine displacements. Is there a way to adjust the bore and stroke? If not are there any programs out there on the web that will allow more tweaking of engine specifications?
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Highlight the cell, type over, hit enter.

The dyno software packages are hit and miss. I've seen some that were within 3hp and 2 tq, others WAY off.
 
I had a friend who used camquest 6 from compcams to calculate his hp. Once he assembled the engine and got it on a dyno there was only 15 hp difference between the dyno and camquest6 figures.
 
dustoff440 said:
I had a friend who used camquest 6 from compcams to calculate his hp. Once he assembled the engine and got it on a dyno there was only 15 hp difference between the dyno and camquest6 figures.
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It uses the same core logic as desktop dyno I believe.
I have also learned how to make up my own cam specs by editing theirs.
Putting the flow numbers of your heads in there makes it even closer.

Rocket, I dont have a problem messing with bore and stroke parameters.
I dont know why you are having that problem.

Did you first pick the standard motor from the dropdown menus?
From there you should be able to do it.

Would I treat this thing as gospel? No.
But providing you follow things to blueprint it is pretty close!
 
The power in these things (dyno software) isn't in accurately predicting the horsepower, but in quickly evaluating changes to the motor.
 
DionR said:
The power in these things (dyno software) isn't in accurately predicting the horsepower, but in quickly evaluating changes to the motor.
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X2
don't look at the Numbers as much as how they differ. With different add ons
 
I'm a little curious on just how far off these can be. I'm messing around with a stock internals 318 and pulling off nearly 400 hp with just Edelbrock heads and intake and a cam swap with 8:1 compression. That seems like a pretty lofty estimate for such low compression to me. If it's true though I'm going to have a fun summer, lol =P.
 
Map63Vette said:
I'm a little curious on just how far off these can be. I'm messing around with a stock internals 318 and pulling off nearly 400 hp with just Edelbrock heads and intake and a cam swap with 8:1 compression. That seems like a pretty lofty estimate for such low compression to me. If it's true though I'm going to have a fun summer, lol =P.
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What did you put in for the head flow numbers? That can make a tremendous difference. In fact if the flow numbers aren't real close you don't stand a chance of getting a correct hp estimate.

Rocket I have Cam Quest downloaded and like Rob said just click on the bore and stroke to highlight it and you should be able to change it. I can on mine.

If you get into the program you can change the specs of cams to make them what you want them to be but you have to leave it named their name or for some reason it won't recognize it.
 
fishy68 said:
What did you put in for the head flow numbers? That can make a tremendous difference. In fact if the flow numbers aren't real close you don't stand a chance of getting a correct hp estimate.

Rocket I have Cam Quest downloaded and like Rob said just click on the bore and stroke to highlight it and you should be able to change it. I can on mine.

If you get into the program you can change the specs of cams to make them what you want them to be but you have to leave it named their name or for some reason it won't recognize it.
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That's because there are other files used for running those cam spec files with the same name. if the name is changed it can't find what it's looking for. Finally someone else who tweaks and plays with things at a deeper level. thumbs up. lol

It becomes a lot better program once you mess with it at that level eh?
 
POS Dakota said:
That's because there are other files used for running those cam spec files with the same name. if the name is changed it can't find what it's looking for. Finally someone else who tweaks and plays with things at a deeper level. thumbs up. lol

It becomes a lot better program once you mess with it at that level eh?
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I figured it was something like that. I'm not really much of a computer guru. Just stumbled onto a post on Moparts where a guy told how to do it. Sure does make it nice to have more cams to choose from. I changed one of the cam files to have the exact specs of the Hughes cam I'm using in my 408 I'm putting together to see how it compared to others and it was right there among the best. Hopefully it didn't lie to me, LOL
 
I used the flow numbers straight off the Edelbrock site. I'm sure they're probably a little generous, but I tried to match whatever I could.
 
I just had my stroker built and the desktop dyno was dead accurate on hp but torque was off by 20 ft,lbs. I did not have my heads flowed but I sent an E-mail to Ryan at Shady Dell about ported "J" head flow and simply used his figures along with other published air flow figures and came up with an average and plugged them in.
 
Map63Vette said:
I used the flow numbers straight off the Edelbrock site. I'm sure they're probably a little generous, but I tried to match whatever I could.
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That'll get you fairly close. I see so many guys just pick something from the drop down menu that I always ask. I haven't looked on E-brock's website so I don't know what #'s they advertise. I've read several posts of head flow numbers by guys on the board here that are reputable that I use their numbers if I don't actually have them flowed. I do that for a baseline then when I put together an engine I take the heads and have them flowed to get accurate flow numbers. Hopefully in a couple months I'll have my new engine in and see how Desktop Dyno and Camquest compare to what it really does.
 
srduster340 said:
I just had my stroker built and the desktop dyno was dead accurate on hp but torque was off by 20 ft,lbs. I did not have my heads flowed but I sent an E-mail to Ryan at Shady Dell about ported "J" head flow and simply used his figures along with other published air flow figures and came up with an average and plugged them in.
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Wow! That's amazing to be that close. I've seen magazine articles tout the accuracy of Desktop Dyno but then again I've seen posts by guys that said they built something and it was way off.

Last week I took my heads up to have them flowed and the guy that did it has a professional dyno program from Comp Cams he said cost him $3,000 and he ran the numbers on my combo. I came home and input the flow numbers and cam specs and it came out within 5 hp of what his program said but torque showed higher than his by about 15 ft. lbs.
 
Lol, yeah, I was surprised to find that CamQuest was free. It's practically the exact same program as Desktop Dyno if you tinker with the cam files. If I remember right the Edelbrocks flowed around 240-260 peak. I found a really nice website that had a big list of heads and flow numbers all in one table (granted it was a compilation and not necessarily everything tested on the same machine), but the Edelbrocks seemed to be the best deal across the board. Other heads peaked better, but suffered a little more low end.
 
Mad Dart said:
Those things are WAY off.......you would be better off posting what you are going to run and have us guess what it will make!:-D
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I don't know about WAY off, the prediction is as good as the data you give it.

FWIW, I have never had my car on a dyno but based on knowing the weight and the 1/4 mile trap speed I can estimate that I have ~370 HP. The Camquest software predicts that I have ~390HP. My 360 is pretty close to the Mopar Performance 360/380HP crate motor which always seems to dyno at more than the advertised 380HP.

That seems pretty darn good to me.
 
dgc333 said:
I don't know about WAY off, the prediction is as good as the data you giveut it.
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X2.

I use Desktop Dyno 2K all the time. I downloaded it for free from a file sharing server.

I try to gather as much info as I can, especially realistic flow numbers. It's really just a general guess until you have the right data and head flow numbers are the key along with compression data. Shady Dell is a good place to start, they publish all sorts of flow numbers. So does Hughes Engines. Guys put up stuff on Moparts a lot too. Once it's all plugged in correctly, it can be a pretty cool tool. I feel like it's fairly accurate, like within a few percentage points as long as all things are input correctly.

There are a few discrepancies, like manifold type is pretty cut and dry, there's really no tweaking that particular field. For example, I used Dulcich's Cheap As Dirt 318 as an example and came pretty close to his numbers but only when I changed to a single plane intake even though he was using an Air Gap. Exhaust also has no variability for size or type.

Going further, once you have a HP number for your combo and you happen to know your car's weight, you can subtract 17 or so % from the final flywheel HP number to get RWHP. Then you use the Wallace racing or TCI online calculators and guess quarter miles times and MPH fairly accurately.
 
you can play with intake file, stock, mildly ported or full ported, also fabricated intakes also
 
What parameters exactly can you change on an intake? Does anyone have the numbers you would need to put in for aftermarket intakes? I assume the same goes for exhaust?
 
I ran my combo through the Comp Cams software and have to say it is pretty darn close. The only problem I had was there is no place to say you are running 1.6 rockers.

Jack
 
Engine analyzer is suppose to be one of the best, you can try a free version of it here. <--This is a direct download link of an .exe. If you do not feel comfortable you can find it in their website.

But one thing you gotta make sure and do is run the numbers you get through a drive train loss percent (this goes with almost all engine simulations). I think the number was 10%?
It might not be even close because it is all just math, but it should give you a good estimate.
 
Part one of how to alter the comp cams software
 

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