MuhThugga

The blue line is the same setup with a 241/251 cam from Ed Curtis. It drove like **** and I hated it. The red line is the 231/239 cam.

big hammer

Something holding that thing back bad. Maybe the intake

MuhThugga

Not a damn thing holding it back. It runs just fine.

big hammer

What kind of truck is it in?

Darth_V8r

iTrader: (4)

This is a great lesson in over-camming. YOu dropped ten degrees out of the camshaft for very little lost performance and likely a tremendous gain in drivability and fun.

big hammer

The larger Cam has a lot more potential but something was really choking it out. The small Cam worked with the combo a lot better

MuhThugga

It's also a great lesson in not placing blind trust in a "cam guru" to come up with the appropriate specs for your stated desires.

I think even more notable than the minimal peak loss is the huge torque gains made on the low end. There is a 50 ft/lb difference at 2K.

Darth_V8r

iTrader: (4)

I did see that also. Probably makes it a lot more fun to drive.

pdxmotorhead

Interesting, When your building a motor that turns more RPM's(sprint car), and uses a Kinsler/HIllborn system, the velocity stacks above the throttle bodies need to be able to hold about the same amount of air as the cylinder. (Thats where we start) then you usually increase the length of the stack till you find the peak for each cylinder if your trying to scrap every last tick of power... ) Lost of ways of getting there,, but this works from what I've seen, I've seen a similar effect on a BMW race motor with it's and a airbox, the airbox needs to have the volume of the engine in it,, so a 2 liter engine has a 2ish liter airbox and the velocity stacks inside are usually < 2" long. FWIW the break point on crank selection and all the valve train on most sprint engines is about 7800RPM, thats where you go to the 30K rotating assembly from the 5 or 6K assembly.. If you want a season lasting engine

HioSSilver

iTrader: (8)

Yup....we always found power by making our bmw air boxes as large as we could and it still fit in the car. I used to love cutting up a carbon airbox from bmw that cost about 10k to scab on my larger carbon box to the trumpets.

spanks13

iTrader: (5)

Well, print media still works. I just bought a holley sniper low pro off summit. I'll check it out this weekend. If it looks nice I may give it a try before hacking up my car to fit the Fast 102. I would pocket $1000 between the cost of the low-pro and my Mamo ported fast.

The runners are definitely too short to offer any significant harmonic tuning. From reading, it would likely be the 5th harmonic that finally matches up at higher rpm which is too weak to even talk about.

The complete LS3 intake tract from valve to intake is ~15.5 inches. This will be ~8.5-9" I figure. Fast 102 w/ med runners is about 11.25".

Another data point, the LS7 intake is a 7" runner length factory.

HioSSilver

iTrader: (8)

The ls7 also has a much better factory bell mouth on it vs other oe intakes.

SoFla01SSLookinstok

Might as well post my dyno chart. Truck 383.

Most know already. Hammr engine isn't just an LS3:
LS7 block: 4.125" bore. Unless over some.
3.622 stroke crank. Shorter than the stock 4" stroke. Engine 388ci.
Solid roller cam. Nice.
Mid runner intake. Nice.
Other goodies. Nice.

That engine better be makin that power or you did it wrong. Lol.

big hammer

Stock ls3 crank my man don’t be mad.

HioSSilver

iTrader: (8)

Soslo in case you didn't read the title this is ls3 intake conversation. Not a chastise Hammer for having a ls3 and posting cathedral head junk dyno extravagansa.

G Atsma

Let's keep it civil, ladies. Don't need the mods doing any gonad-kicking....

SoFla01SSLookinstok

Apologize if I hurt ur feeling on the LS73.

I got a little interested in you saying where everyone should rev their motor to. With you looking like a moron.

Sorry if I pissed anyone off. Excluding hiho & ham. You two foolz just keep telling people what to do & if it's right. I'm out.

Darth_V8r

iTrader: (4)

FWIW, with your dyno graph, you should be shifting at 7500+

big hammer

Sorry it just kinda makes a guy go cross eyed when guys make Cam only ls3 hp with fully built stokers and thing they’re doing well

sixty9fordkiller

hahahaha