FREE cam sellection software

[grumpyvette]

http://www.compcams.com/Camquest/default.asp

 

comp cams is now offering a free cam sellection software,THIS IS A USEFUL TOOL, this is useful in seeing the lift/duration/LCA they suggest for your application, in most cases they get fairly close so its a tool thats useful, now you don,t necessarily need to buy a COMP CAM but a cam with a similar lift/duration/LCA from your favorite manufacturer probably should be fairly close to whats recommended

 

 

 

willing to spend a few bucks ,want far more detailed results and a program requireing FAR more detailed input??

 

http://www.auto-ware.com/software/eap/eap.htm

[naviathan]

Nice! Thanks for the scoop grumpy!

[80LS1T]

Thanks Grumpy! I'm in the market for a new cam...this should help!

 

Guy

[John Scott]

Thanks Grumpy. Been playing with it today, a few bugs in the application, crashes frequently, still a nice tool.

[z383z]

Really cool program fun to play with doesn't have a few things such as intake runner volume on the heads, combustion chamber size, deck height, piston design, as well as rod length, quench, rocker style/ratio, more intake selections, spring pressure, oil pan design, gear/belt/chain drive, accessories, exhaust size and header design, ignition curve, ect. But hey what can you expect for free. Still a fun program to mess around with thanks for the post. Makes me wish I went with the 434 instead of the 383 but hey now I have an excuse to start building another engine. Interesting that it says going to a single plane wouldn't hurt my tq. curve it would also raise my peak tq. by 20 and give me 40 hp.

[grumpyvette]

"Interesting that it says going to a single plane wouldn't hurt my tq. curve it would also raise my peak tq. by 20 and give me 40 hp."

 

software simulations are only as good as the data paramiters used, and its RARE for a single plane to best a good dual plane intake below about 5500rpm, in tq or hp so keep that in mind!

 

your looking to increase the AVERAGE hp/tq more than the PEAK hp/tq if you want a fast car!

Ive seen a 20hp gain in PEAK hp on a 496 BBC resulting from a single plane intake swap from a good dual plane intake slow the cars 1/4 mile times over two tenths of a second, your gearing, suspension, traction,power to weight ratio and AVERAGE RPM band has a huge effect on the TOTAL performance.

the only way youll know if the software guess is correct is TESTING the parts on YOUR particular combo,in the real world

 

BTW

this software

 

http://www.auto-ware.com/software/eap/eap.htm

 

is a P.I.T.A. to use but its is usually far closer to correct, and when you make a bad choice in components it points out the flaws and suggests where you can improve the combo

[z383z]

Would you recommend the program that you posted at the bottom? How many variables are there for you to enter and about how long does it take to fill out a profile on an engine? thanks

 

As for the single plane it would raise my average tq. which surprised me I wonder how accurate it is. It doesn't get very specific I wonder what they mean by standard, high, and max flow intakes. I assume it is the rpm ranges they operate at?? Even than the rpm range that the manufacturer recommends and the one summit says can be completely different. Oh well I guess I will just have to figure it out on the dyno.

 

Im getting exhaust tmro and my car will finally be on the road

 

example

http://www.holley.com/300-110.asp

 

http://store.summitracing.com/partdetail.asp?part=HLY%2D300%2D110&autoview=sku

 

Makes me wonder how summit comes up with its numbers if not from the people who develop and produce the products.

 

 

 

"Interesting that it says going to a single plane wouldn't hurt my tq. curve it would also raise my peak tq. by 20 and give me 40 hp."

 

software simulations are only as good as the data paramiters used, and its RARE for a single plane to best a good dual plane intake below about 5500rpm, in tq or hp so keep that in mind!

 

your looking to increase the AVERAGE hp/tq more than the PEAK hp/tq if you want a fast car!

Ive seen a 20hp gain in PEAK hp on a 496 BBC resulting from a single plane intake swap from a good dual plane intake slow the cars 1/4 mile times over two tenths of a second, your gearing, suspension, traction,power to weight ratio and AVERAGE RPM band has a huge effect on the TOTAL performance.

the only way youll know if the software guess is correct is TESTING the parts on YOUR particular combo,in the real world

 

BTW

this software

 

http://www.auto-ware.com/software/eap/eap.htm

 

is a P.I.T.A. to use but its is usually far closer to correct, and when you make a bad choice in components it points out the flaws and suggests where you can improve the combo

[grumpyvette]

the EA PRO program allows you to enter just about every factor you can think of, in fact its so detailed it takes some time to look up and enter the data , but it does produce fairly accurate results and promps you when you screw up choices.

 

the KEITH DARTON intake is one of the very best available, I generally use them in prefferance too the edelbrock vic or dart or brodix as its generally a better value in my opinion

BTW a HOLLEY or DEMON 800-850 cfm makes a good match, but to take advantage of the intake flow charactieristics youll need a cam in the 245-up durration at .050 lift a 11:1 or higher cpr and stall and rear gear ratio to match

you might want to keep in mind the heads,flow rates and exhaust restriction levels and tunning must also match or the intake flow won,t reach nearly its full potential

Id generall be thinking about a 383-427 displacement, 11:1-12.5:1 cpr,solid lifters, heads that flow over 270 cfm peak,4.56 rear gears and keeping the engine rpm range above 4500rpm and below 7000rpm durring 90% of the race

[pparaska]

Interesting tool.

 

Since Comp Cams insists that all street-application and even most drag cams have a 110 Lobe Separation Angle (more descriptive to me than LCA) the suggestions almost always show a cam with 110 LSA. If you go into the Oval Track stuff, you start to see 106LSA cams being suggested. I know Terry Oxandale uses oval track cams on the street and likes them.

 

I think it'd be nice if the cam companies started being truthful with us and followed a technique more like what Vizard writes about. In other words, use the LSA that makes the best power and just back down on the advertised or 0.050" duration and select the right cam with the right overlap.

 

I noticed that the cam info area doesn't show overlap. Of course you can look at IVO+EVC seat-seat and add them in your head. But I wonder if they are considering overlap when selecting what is a great or good fit.

[gretchen/jason]

Nice download only question i have is the HP readings at the end of the program . I entered all my info it even had a selection for my weiand supercharger for a sbc 383 .

 

But when it said 180 horses at 7000 rpm please tell me i added 180 horses of course i know the engine has more then that only thing i couldnt pic is the intake manifold for the supercharger maybe that is the problem .

 

Jason

[Michael]

On my first attempt playing with this software, it gave hp/torque curves very similar to Desktop Dyno’s predictions - except that it’s less optimistic than DD on low-end torque, and the torque curve doesn’t fall as steeply as DD predicts; DD really penalizes high-rpm torque rolloff for advancing the cam.

 

For camshaft recommendations, the intake lobe that’s their #1 choice is almost identical with what I ended up at - lift is exactly the same, duration is 3 deg less; can’t exactly compare area under the curve due to insufficient information. On the exhaust side, their recommended lobe again has the exact same lift, but about 10 deg less duration. (disclaimer: being in a hurry, I picked head flow numbers from the supplied library, which was closed to what I have, but not “exactâ€). For the cam that I ended up buying, I intentionally picked higher exhaust duration as a crutch for poor E/I on the heads (Brodix Race-Rite) and a weak exhaust system. Also, I went with 112 lobe separation - as mentioned already in this thread, Comp has a fixation on 110.

 

So, bottom line: the approximation is sound, given the sparse input deck and necessarily coarse assumptions. But if you already know what you’re doing (OK, sort-of ), all that this software will do for you is provide a warm-fuzzy.