Benefit of ported heads - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

RealQuick · 05-26-2021, 12:09 PM

Quote:

Originally Posted by Yellow 1

Can possibly work against you; I have CNC GMPP heads fitted (done at same time as Magi install) and the efficiency of the heads along with the long tubes means that I'm only pushing "about" 6lbs of boost (according to Magnuson tech guys) where normally they'd expect about 7lbs. They theorize that the spent stuff is getting scavenged from the combustion chamber more efficiently than usual. Dunno how true this is without getting the car in a laboratory or the motor on a flow bench/dyno. All I know is, it's plenty :-)

This is completely wrong.

Rob ZL1 hit the nail on the head.

Yellow 1 · 06-01-2021, 06:04 AM

Only imparting what the blower manufacturer told me. I used to work in diesel engine design and know a little about breathing and scavenging (admittedly my discipline is diesels, BIG diesels) and I suspect there may be a grain of truth in what they told me but hey....

RealQuick · 06-01-2021, 07:44 AM

The "working against you" part you stated is completely wrong. You seem to imply that the drop in "psi" is the working against you part.

That is completely wrong.

Drop in PSI shows that the heads are working for you, not against you.

BiggFoot · 06-01-2021, 01:59 PM

Quote:

Originally Posted by RealQuick

The "working against you" part you stated is completely wrong. You seem to imply that the drop in "psi" is the working against you part.

That is completely wrong.

Drop in PSI shows that the heads are working for you, not against you.

Agreed, you make improvements to relieve pressure through the system then you get a blower that will deliver more air

Yellow 1 · 06-03-2021, 07:17 AM

Quote:

Originally Posted by BiggFoot

Agreed, you make improvements to relieve pressure through the system then you get a blower that will deliver more air

Absolutely agree on that - the faster you move the burnt stuff out, the better. The Magi guys suggested I go smaller pulley and bigger squirters and ramp it up some more but if I'm honest it's plenty as is.

xdamxincx · 06-17-2021, 07:52 PM

the 416 will like a ported head or aftermarket head.. around the 255 cc range... it will be happy with a little more compression too...

racesloth · 06-18-2021, 10:33 AM

Quote:

Originally Posted by Yellow 1

Can possibly work against you; I have CNC GMPP heads fitted (done at same time as Magi install) and the efficiency of the heads along with the long tubes means that I'm only pushing "about" 6lbs of boost (according to Magnuson tech guys) where normally they'd expect about 7lbs. They theorize that the spent stuff is getting scavenged from the combustion chamber more efficiently than usual. Dunno how true this is without getting the car in a laboratory or the motor on a flow bench/dyno. All I know is, it's plenty :-)

Sounds like you are ready for a smaller pulley

Yellow 1 · 07-07-2021, 08:12 AM

Quote:

Originally Posted by racesloth

Sounds like you are ready for a smaller pulley

You're a bad man Dan....
Hope you're well buddy and dodging the CoVIDsh1tstorm.

morepowerjoe · 07-08-2021, 08:25 AM

Going to a bigger valve won't net you much horsepower at all on a boosted application. I would focus on your fueling and go with E85 which will lower your intake temperature considerably and get you a lot more power then spending all that money on your heads for like 10 horsepower.

G8One2 · 07-08-2021, 02:55 PM

The stock heads actually flow really quite well. Aftermarket heads dont flow much better than a stock CNC ported head. They do off other things that the stock heads dont, but they are specific use cases for this. You need to know what you want and what your trying to do. Pick your cam, and look at the flow rates up to max lift of the cam you want to use. Compare it to the flow of stock heads, CNC ported stock heads and the flow rate of aftermarket heads. You will be able to make a better judgment on what you want to do and where you want to be by looking at those numbers. And you'll be smarter with your hard earned money. Any place you call is going to try and sell you their stuff, keep that in mind. They're all salesman's...

06-01-2021, 06:04 AM	#16
Yellow 1 Grumpy Grey-haired Guy Drives: Camaro, Corvette & Merc C300(daily) Join Date: Aug 2014 Location: South Warwickshire, UK. Posts: 806 View My Garage	Only imparting what the blower manufacturer told me. I used to work in diesel engine design and know a little about breathing and scavenging (admittedly my discipline is diesels, BIG diesels) and I suspect there may be a grain of truth in what they told me but hey.... __________________ ---------------------------------------------------------

07-08-2021, 08:25 AM	#23
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,103	Going to a bigger valve won't net you much horsepower at all on a boosted application. I would focus on your fueling and go with E85 which will lower your intake temperature considerably and get you a lot more power then spending all that money on your heads for like 10 horsepower. __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

06-01-2021, 07:44 AM	#17
RealQuick Drives: 2010 Camaro 2SS M6 - Intake/Exhaust Join Date: Sep 2014 Location: Bridgewater Posts: 693	The "working against you" part you stated is completely wrong. You seem to imply that the drop in "psi" is the working against you part. That is completely wrong. Drop in PSI shows that the heads are working for you, not against you.

06-17-2021, 07:52 PM	#20
xdamxincx Banned Drives: zl1 blk Join Date: Nov 2017 Location: sth fl Posts: 152	the 416 will like a ported head or aftermarket head.. around the 255 cc range... it will be happy with a little more compression too...

07-08-2021, 02:55 PM	#24
G8One2 Drives: 2014 Camaro 2SS Join Date: Feb 2015 Location: Metro Detroit Posts: 492	The stock heads actually flow really quite well. Aftermarket heads dont flow much better than a stock CNC ported head. They do off other things that the stock heads dont, but they are specific use cases for this. You need to know what you want and what your trying to do. Pick your cam, and look at the flow rates up to max lift of the cam you want to use. Compare it to the flow of stock heads, CNC ported stock heads and the flow rate of aftermarket heads. You will be able to make a better judgment on what you want to do and where you want to be by looking at those numbers. And you'll be smarter with your hard earned money. Any place you call is going to try and sell you their stuff, keep that in mind. They're all salesman's...