Giant LS3 Intake Manifold Dyno Shootout!
#61
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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.
#66
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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
#67
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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.
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I did see that also. Probably makes it a lot more fun to drive.
#69
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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
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#70
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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.
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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.
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.
#73
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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.
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.
#74
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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.
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.
#75
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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.
Last edited by HioSSilver; 03-07-2018 at 08:51 PM.
#76
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Let's keep it civil, ladies. Don't need the mods doing any gonad-kicking....
#77
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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.
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.
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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.
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.