Designing New Intake Manifold

[Vaddy]

Hey guys, for you guys who don't know me, I am the one who was doing a turbo build and 3D Metal Printed headers over in the Forced Induction forum. So now discovering this new power, I now want to go ahead, design and 3D print a new intake manifold for the V6 while I wait for more 3d printed stuff. If you have seen SCAP custom intake manifold they did for the LLT engine I believe in 2010, that's what I am going to be modeling it after. I will keep this thread updated and I'll release the STL file for you guys to print it yourselves and any bolts you might need to buy. This will take a while so bear with me. I am starting today hence why I started this tread. I do have one or two questions tho. The LT1 and a few other GM engines have the same throttle body connector meaning you can theoretically fit a 100mm throttle body, so what's the biggest this engine could take without loosing power and that makes sense?

[KillboyPowerhead]

Neato.

Based on some quick info I found on the net, an NA 3.6 liter engine spinning at 7200 RPM tuned to the tits (let's say 110% volumetric efficiency) would require about 500 CFM of air. (Not sure how accurate that is as I'm currently seeing 2,250 lb/hr on the MAF which according to an online calculator translates to 500 SCFM, but I just started tuning these Mace cams and can't imagine I'm at 110% VE, or maybe I just got lucky ).

A 72mm throttle body is capable of around 700 CFM, a 76mm TB around 790, and an 80mm about 875 (give or take - again, just taking some quick info from the net and don't necessarily know what I'm talking about).

As far as forced induction goes, if we say 1 bar (~15 pounds) boost, or double the air flow required (just call it 1000 CFM - also depends if you spin past 7200 RPM, etc.), an 86mm TB would pass that much air, so let's say 90mm to account for the throttle blade. With that said, I have no idea what size TB's the boosted guys are running, and I'm pretty sure some have run 15 PSI boost with the 80mm TB.



Interesting nonetheless.

[Vaddy]

Originally Posted by KillboyPowerhead

Neato.

Based on some quick info I found on the net, an NA 3.6 liter engine spinning at 7200 RPM tuned to the tits (let's say 110% volumetric efficiency) would require about 500 CFM of air. (Not sure how accurate that is as I'm currently seeing 2,250 lb/hr on the MAF which according to an online calculator translates to 500 SCFM, but I just started tuning these Mace cams and can't imagine I'm at 110% VE, or maybe I just got lucky ).

A 72mm throttle body is capable of around 700 CFM, a 76mm TB around 790, and an 80mm about 875 (give or take - again, just taking some quick info from the net and don't necessarily know what I'm talking about).

As far as forced induction goes, if we say 1 bar (~15 pounds) boost, or double the air flow required (just call it 1000 CFM - also depends if you spin past 7200 RPM, etc.), an 86mm TB would pass that much air, so let's say 90mm to account for the throttle blade. With that said, I have no idea what size TB's the boosted guys are running, and I'm pretty sure some have run 15 PSI boost with the 80mm TB.



Interesting nonetheless.

Good to know