Making a custom grind camshaft?

[jonnyboy1617]

Ive been playing around with "Dyno 2003", sometimes its fairly accurate but other times seems pretty far off. So here is the thing, I was playing with different cam grinds and ran into a profile that gave me good high rpm torque, decent upper power, and still kept my dynamic compression ratio decent, (which is a problem, I have 9.3:1 static and I'm trying to find a raunchier cam.)

One thing I'm worried about is trusting numbers from a program to give me accurate hp and torque results. Another thing is wondering if it actually knows how the valve timing is affecting performance. For example, would it know if the intake valve is opening too late or too early, robbing performance, ect? I will probably be giving CompCams a call here soon to get an opinion of the cam grind, but what do you all think? Here is a Picture of the simulated dyno and the major specs will be below that.



360ci, fully ported J heads (flow data pulled from stan weiss' list), RPM Airgap dual plane, hedman headers, holley SA 670cfm, 9.3:1 static (7.89:1 dynamic with cam below)

And for the cam...
True IVO: 21.5 IVC: 53.5 EVO: 68.5 EVC: 36.5.
Duration (seat to seat) 255/285. Lift (.050): .530/.530.
Intake, exhaust, and lobe center angle: 106. Valve overlap: 58.

The chart also says I will be pulling an average vacuum of 14.5 in. hg. Would this be too low? I don't mind having a rougher idle as long as it doesn't die at stoplights, And I do have power steering, but no power brakes or air conditioner.

Does anyone have an idea of how it would act? Or does anybody have a good simulator, like engine analyzer? Thanks for any input.

 

[crackedback]

If you are SERIOUS about getting a custom grind, call someone that builds engines and orders them on a regular basis.

I'd suggest Brian at Indio Motor for a Comp Cams custom grind. 760-342-2178

Those simulators work ok but aren't perfect.

 

[1wild&crazyguy]

14.5 in hg with that cam? more like around 10 in hg. jmo

Sounds like a decent cam,I can see why the @.050 is bigger, than usual for 285*, with the .530 lift.

 

[moper]

The simulators are fun toys. Not much else. I would suggest as 1 Wild did. Call a custom cam grinder and talk to them. Brian is good, as is Scott Brown. Do NOT call Comp Cams standard tech line and ask about custom grinds. They have no idea what to do and the best thing they can do is refer you to a catalog shelf grind. Talk to a builder.

 

[1wild&crazyguy]

The simulators are fun toys. Not much else. I would suggest as 1 Wild did. Call a custom cam grinder and talk to them. Brian is good, as is Scott Brown. Do NOT call Comp Cams standard tech line and ask about custom grinds. They have no idea what to do and the best thing they can do is refer you to a catalog shelf grind. Talk to a builder.

Wasn't me who said, would have, but it was already said by crackedback.

I agree with you about the comp cam thing, I e mailed them 6 yrs back 3 times with the same info and got 3 diff recommendations back.lol

Only one of the recommendations was fitting for the build, and it was a combo of lobes to make a custom grind.

 

[jonnyboy1617]

Thanks, I'll try and give Brian a call here soon, or Scott if I can get the number. And I just noticed that I posted this in "engine issues", OOPS.