Do Cylinder Heads Matter Under Boost? Engine Masters Season 6 Premiere | MotorTrend

Look Mike Finnegan they're wearing masks you ought to try that on your show!

I prefer PowerNation they have longer shows for free and they build lots of Ford motors not like these guys that prefer Chevy and Mopar.

Come on now. Masks?

Thank you so much. I was wondering how much high-flowing cylinder heads make on an engine.

Not how I would have conducted the test. I would have swapped up the heads until you did not make any more hp normally aspirated THEN, throw the supercharger on it for the test.

1) the larger the cylinder bore, the less shrouding by the bore walls, the better any cylinder head's flow results. Try this on a 4 inch bore, and you really will see some change. Why? Typically its the angle of the valve related to the bore centerline--if you compare cheap heads with a stock angle versus a better head. But we're talking boost here.

2) you swapped carbs from NA to blown. It shouldn't matter, but it does on some engines. The timing change is a necessity, however.

3) Blowing air into an engine is only half the battle--it has to exhaust in order to get out of the way of the next charge. That's where a head with a better exhaust port shines. I haven't seen the full video, but I would be shocked if there is little difference between a poor exhaust and a superior one.

4) Boost is nothing more than a register of how much resistance the head is offering to airflow. The better the head's intake flow, the less boost needed to make the same power as the engine with worse flow and thus more boost. Amount of boost is important when you need to consider detonation and/or intercooling of the charge.

5) after all this...air flow is only half the battle. If it burns poorly inside the cylinder...then it really doesn't matter how much gets crammed into it. If it burns poorly, then a lot of it is getting pushed out the exhaust. On the power stroke, the power gets made in the first two inches of travel--after that, the combustion area is just too big and the piston's already got inertia so the "kernel" is just chasing after the piston top.

so your head can flow a ton of cfm but if the chamber design is from the 1950's and the spark plug is way off in the corner and the air separates from the fuel...its not going to do as well as the head with a better combustion chamber.

there, saved myself $60 a year for what I can get for free off the internet :)

I had a Merkur Xr4ti. 1987, 2.3L engine, turbocharged from the factory, RWD, T5 Transmission. I did the usual 3” Downpipe, intercooler, injectors, forged pistons, forged rods, and put it together with a stock head and and custom camshaft.

When the car overheated, because I didn’t re torque the head studs after the first heat cycle or so, it warped the stock head, so I purchased the Esslinger Aluminum head.

The amount of power it gained between the stock head, and the Esslinger head was absolutely nuts.

You make more power more sooner and it got rid of that feeling of falling on its face in the high up RPMs from a stock turbo.

Turbo motors, like regular NA motors, just need to breath

You should have compare those two with the same boost level!

Your new episode on "octane" is complete e85 propaganda!!! You didn't run the timing @ 33° with the 110, or 116 octane, but you jumped right to 33° with the corn?! You expect us to believe that 116 octane wants the same timing as 87 octane?!?! Either you guys are completely tardy, or you think we are. You guys used to be cool, what happened? Money?

Just came here to downvote the sellouts. This show used to be free on YT.

How about you switch things up and do a Pinto motor turbo

I think it needs a better air filter. Put a Mask on it!

Mr Freiberger I have a predicament. I have a 71 olds 350 I want to do a medium priced build on, trying to get as close as I can to 500 hp. There are almost no videos on this. Would you guys be able to do a build up of any type to an Olds 350, even if its a stroker. Please. The 455's been done to death, I'd love to see what you come up with.🙏☮😄👍

If you have a 54 cc head on a block that is pissed off with boost on that it will turn in to a stick of tnt

I wish you had chat on the MTOD, but... since you dont... I'll post this here.

Oil Filter Shootout - WHY oh WHY did you not test Amsoil's Oil Filter?? The show is "presented by Amsoil"!
Been using them for years... would be great to know the differences.

Really. . . I Would think, when it Comes to Boost and Airflow Characteristics. . . You not only want Heads that have larger intake Runner and bigger Valves. . .
I would think you would want a Cam that has a lot of Lift and Duration.
The Cam is the Brain of the Mechanics behind the Valve train, and it Controls how far and how long the valve opens. . . So I Say Yes, Better Heads, and Bigger Cam.

Teaser episodes nooooooooooooo :(((((

Why the masks?

Lame tease.

On supercharged engines, boost will drop with more efficient head and power will still be higher. On a turbo engine, since boost is regulated at a fixed psi, a more efficient head will make more power in relation to psi. If the head is 10% more efficient per psi, the power will be around 10% more at the same psi as Holdener showed. With a supercharger, at the same rpm, boost will drop and, depending on how efficient the new head is over the old, power may be higher but will definitely be higher at the same psi which will be at a different rpm with a supercharger since it is rpm dependent.

Agent watched yet….. IT MATTERS, now to the show.

Just got done watching this episode on Motor Trend and something is driving me bonkers.
Why is there a big honking hole (looks like 1") in the charge tube right before the blower hat?
I kept thinking Y'all would surely put some sensor or something to plug the hole before you made a pull, nope.
I fast forwarded, rewound, back & forth and nope, unless it's some editing witchcraft it appears as though the with supercharger pulls were made with a hole bleeding off boost????
Dave I hope you see this and correct me or explain so I can eventually sleep at night again.
Love all you guys work.

Does that upper boot have a hole in it?

What would the blower version pull with E85?

What's up with the giant hole in the coupler? Did I miss something?

Where's the rest of the program this one cut us off before the blower install

Why can't it tolerate the same timingas NA?

this sucks we have been cut off on motortrend here in Australia and cant watch full episodes

BOOOOO! COVID & NOS REFILLS GOT ME BROKE

Eric Weingarten does not approve

Right on

This is BS !!

Im not happy that the timing was retarded.should have set it at 28 to start

To make the same power with a small head you must use a higher psi of boost let’s say you make 600 hp woth a small head at 14 psi you can make the same power with a larger head at maybe 8-10psi

Glad you guys were wearing masks. I would hate for that engine to get covid

OK..... W T F happened to what you said you were going to do ???? I got 6 minutes WHERE is the rest of it ????

If you're not going to put the full video then it shouldn't be up at all. I love your content but I don't get to watch enough to pay for it.

The problem is biggers head with boost is it’s more effective on turbo cars because exhaust clearing out if he cylinder bearing more important. Supercharger cars don’t show that big difference

What happen with res of the video

What a tease guess I have to pay for it. Or not

WTF is up w/the masks? You were just in a room together w/out masks 🎭

clickbait!

I don't think the people at least David freiburger understand the concept of cylinder head flow and boost relationship. If you took a hair dryer and tried to blow dry your hair with a straw on the end of that hair dryer, the hair dryer is doing the same amount of work. It's always done but you're not going to get very much air out of the end of that straw. Now if you flip it around and put a 1 and 1/2-in pipe on the end of that hair dryer you going to get the hair dryer doing the same amount of work it always does but much much more air. The concept is with high flowing heads. You will get more air with less boost pressure because there's less resistance trying to pass through the intake port and out of the exhaust port. This is very simple concept. Not sure why you do not understand this. Most very experienced engine builders know this.

Ok im not an expert so tell me sbc as far as I know had 194s and 202s yet I remember powerpac cambacks and I have seen just a rectangle no point no humps can u do a vid on sbc heads 60s 70s

Who wouldn't love to get paid to play with engines and dynos all day??

4 valve heads have better volumetric efficiency

If I run a xe284h cam on my 350 small block is it better to run a call hump head or a 400 small block chevy head for performance

Bullshit teaser video, either show the results or don't bother posting... there is better content to be had on this platform without the paid subscription. Thumbsdown👎