I've been playing around on a dyno program for a couple days now with different cam profiles and have found a really good combo on the program, the question i have is how well would it translate to a real world engine
Now the profile i've come up with is as follows
cam specs @ .050" of lift
Lobe center: 108 degrees Intake centerline:110
Intake duration: 210 degrees Exhaust duration:220
Intake lift: .450" Exhaust lift: .450"
Ivo -5 degrees Ivc: 35 degrees
evo: 36 degrees Evc: 4 degrees
with these numbers and the patriot heads flow chart numbers the hp numbers are very strong over 160hp at 5500 rpm till 6500 rpm ( yes i know the rev limit on a 2200 is like 6200) but this proves it carries power all the way to the top of the rpm limit, It also starts making power at 3000 rpm and produces 182lb ft of torque at 3500 and carries that until 4200 or 4300.
The charts seem to say that this profile still follows along the lines of the stock power curve just moves it up a bit. anybody have any thoughts or run anything similar as i'm really curious how it feels in a real life situation.
J~
Those are pretty good, and mild cam numbers. I have custom ground a few 2.2, and 3.4 cams with lift and duration very similar. I prefer to go 210 on both the intake and exhaust, especially if you are running a decent free flowing exhaust.
MidwestMasterCustoms wrote:Now the profile i've come up with is as follows
cam specs @ .050" of lift
Lobe center: 108 degrees Intake centerline:110
Intake duration: 210 degrees Exhaust duration:220
Intake lift: .450" Exhaust lift: .450"
Ivo -5 degrees Ivc: 35 degrees
evo: 36 degrees Evc: 4 degrees
with these numbers and the patriot heads flow chart numbers the hp numbers are very strong over 160hp at 5500 rpm till 6500 rpm ( yes i know the rev limit on a 2200 is like 6200) but this proves it carries power all the way to the top of the rpm limit, It also starts making power at 3000 rpm and produces 182lb ft of torque at 3500 and carries that until 4200 or 4300.
The charts seem to say that this profile still follows along the lines of the stock power curve just moves it up a bit. anybody have any thoughts or run anything similar as i'm really curious how it feels in a real life situation.
J~
First of all, the lobe centers of 108 deg is awefully tight for a fuel injected computer controlled motor. That tight of a LC will cause very low vacuum and throw all kinds of codes and cause your motor to run rich.
Second, unless you're running a s/c, or allot of nitrous, and/or stock exhaust, running the longer exhaust duration will kill the torque. Even though the stock exhaust is very restrictive, the in/exh balance is nearly ideal with the stock head and cam. The stock cam has symmetrical lobe profiles, unlike the SBC, which has anywhere from 8-14 deg more exhaust, because of the in/exh flow imbalance.
Third, not all lobe profiles are created equal. The biggest differences are in the ramp rates and duration at max lift.
Finally most dyno programs out there just use an "average" lobe profile, which would just give you an "average" result. The more in depth the program is, the more accurate it will be, though.
Your best bet is to go to the cam manufacturers Master Lobe Profile Catalogs and find an appropriate profile. Crane Cams probably has the most complete compilations of usable profiles, followed very closely by Comp Cams.
Our motors use the same lobe profiles as the SBCs with the hydraulic roller cams. In the crane catalog they'll be listed as the HR-1 and HR-3 profiles. The HR-1s being a standard hydraulic profile, with more aggressive ramp rates and a greater possibility of tripping knock sensors and causing a loss of vacuum with the possibility of mixture problems. The HR-3's are computer compatible grinds that are better suited to fuel injected motors, though the HR-1s can be run, if the set up is correct.
Comp Cams has the High Energy and Magnum profiles, use the Low lift profiles here and the Xtreme Energy profiles, that are compatible to our motors.
As with any of those profiles listed above, watch your lift amounts and compare the different amounts of lift with different rocker arm ratios. Also, talk to the techs from each company about which cam would be appropriate for your intended use and how the motor is to be built.
See thats what i was curious about, what i'm playing with is Dyno 2000 version 3.10 i know its a very basic program thats just giving me some base numbers to play with and idealizing/generalizing conditions in regards to the actual results i'm getting with its graphs.
Which is why i posted the question here to find real world performance answers, I know enough to do some basic designing but i dont have that real world experience to look at the cam i've created and decide if its to aggressive for street or if i'll have little issues here and there.
Thats also why i was looking at E manage to try to tune around certain issues that i know will come up as i have some lofty goals for a streetable car. I was also debating running around a 75hp shot of nitrous on the car.
just my overall plan, i may change it here or there depending on what my budget works out to be.
Oh that reminds me, Crane can create any profile i were to dream up for the most part correct? what does a regrind from crane average on the 2200s as i cant seem to locate a price?
J~
I would stay with the stock lobe centers. I can grind you one on your core(similar to those numbers) for about $150 + shipping.
LMK if you are interested.
What is the stock lobe center on the 2200? I've found alot of info but no specs on the cam at all, if you have some specs i would be very appreciative.
J~
The stock LC is 114 deg, this is the most common LC used on fuel injected motors, it creates a smooth idle and lots of vacuum. Valve lift on the 2200 is .421". The duration, if I remember corectly, was about 194-196 deg @ .050".
