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Gotta love the 1nzfe. Best engine out there.

I'm pretty sure that one of these could be awd with GM/OPEL/HOLDEN/&or SAAB parts

Did you ever test slash cuts with a radius

The Audi dual cone plenums with slit are supposed to be good also for turbo use. Plenums for turbo and n/a have very different working conditions. So I hope people dont confuse things thinking one design is good for all cases. Secondly something many dont realize is that the air in the plenum is very chaotic when the engines running. It does not flow from the throttle body down to the cylinder in a straight pass. Check out kaase video where he puts a finger in the plenum.

Great video man, thanks a lot

I used to work at an efi repair shop. We tested MAF sensors with just a hair dryer. You can also use a maf sensor for these tests just measure the 0-5v signal coming out. You can get a graph from the manufacturer for the voltage per cfm.

Not seen one of these for years hello from hometown of KFC Corbin ky USA im scotty

I want to see slam in from the runner side. (Bottom feed),Radius the middle port only. Most similar to the test right after you pulled the clay.

Just in time... was going to make a frontal intake, back to the drawing board, this has completely changed my view. if you put some dry dye in the box we could see the actual air flow. Great video - Thank You.

Very nice 352 HP WOW!

Next project please consider trying to do a cheap turbo vortec 4200 catfish camaro

I'm getting into the weeds a little bit trying to improve the intake for my turbo 3800. currently using the f-body intake which I highly suspect is leaning out the back cylinders under high flow conditions as you described. no easy options to fix that but since you're fabbing intakes, have you looked into doing like a lehmann setup? I was thinking it could be done in a simple way if you make a typical mailbox plenum and just have the throttle body go at the end like normal but have it feed an inside tube that runs all the way to the other end and has a slot opening pointing up away from the runners. There's some math to getting the slot dimensioned right but it seems pretty doable.

I really like the video. Appreciate all the work you put into showing this!

Wonder if varying lengths inside of plenum with end mount throttle body could tune them to be same.

10:30 I think what you are seeing in your slam air experiment is the slammed air is making an inertial wall and splitting the chamber into two separate circulation chambers. You have a conservation of mass/energy equilibrium here: (11.6 + 7.5)/2=9.55 I’m just guessing off the cuff here, but I suspect if you were to vary the rpm of the intake air (shop vac) from 0 -> 100 % you would see the ratio of the speed of the air from the left and center ports go from favoring the center port at low rpm to favoring the left port at higher flow rates. Just a guess tho.

Have you seen/ tested the 3500 upper intake on the equinox. The throttle body is on the passenger side on the intake. I always thought would be great for a turbo. Opposite side of all the heat

I've been surprised to see several supercharged applications also using a tunnel ram. Without really getting into the science.The tunnel ram seems unnecessary when you have boost. What's the real answer on this?

I would go with a duel plenum like a nissan gtr.

Now you tell me.😢 It's it's too late to save me.Just save yourself. Get out while you can. 😊

Good stuff! What about 2 tubes from the central plenum into each outer plenum instead of one big one each?

Couple of comments: The DeLorean V6 is a 90 degree odd-fire design. And tuned runner lengths work for naturally aspirated engines to boost torque where the resonance reflection arrives back at the intake valve just as it opens thus giving the charge a little help getting going. Boosted engine don't care so much about intake design because of Pascal's Principle which states that all surfaces within the manifold will be at equal pressure....so each cylinder will get the same amount of air unless something obstructs the flow such as you did by blowing air right across the tube which creates a siphoning effect due to the Venturi principal. Inject the incoming air as far away from the inlet openings and the rest of the design doesn't matter very much when under boost. Same goes for exhaust manifolds where NA the tube length matters if you're trying to maximize a certain RPM range, but with turbo's a simple log works pretty much as well because it's pressurized and again Pascal comes into play. People make beautiful 'nest-O-snake' manifolds for turbo cars that look great but really offer little advantage to a simple log as long as that log is of sufficient volume to not impede flow. The big takeaway is that flow happens because you have a pressure differential. Cylinders filling lowers the pressure within the manifold and atmospheric air rushes in to equalize the pressure so best attempts should be made to give all inlets equal access to the incoming air within an adequate volume plenum. Torque can be gained by proper length inlet tracts and more important for Helmholtz resonance is the VOLUME of the plenum. The runners can be tailored to boost a certain RPM while the box volume to resonate at another RPM. This is done on many motorcycle engines where the stacks are tuned for high RPM filling and the box resonance for cruise conditions. It depends on how wide of a RPM range the engine must operate within whether you can use this effectively or not. My SVT Focus engine has a 'Dual-Stage' intake where long tubes for good torque get rotated and pulled out of the short stacks that flow better for high RPM power. Long tubes are great for torque but get restrictive at high RPM. For runners to work well they need to be small enough to create velocity which is what fills the cylinders past BDC...but too small will be restrictive and too big won't generate enough velocity to help. Of course that's NA only and under boost...pretty much only the boost matters making the manifold much less important. Were I you...I'd try making the runners short enough to feed the motor at high RPM and tailor the plenum volume to resonate where you plan to cruise...best of both worlds. Good on you for experimenting and trying to learn!!

All engines are boosted. Some just more. Atmospheric pressure is pressure when the cylinder is empty.

Nice, lots of interesting stuff here.

Have you tried a collector style? Like a set of headers would be only on intake. I realize it would be difficult to get under the hood but just curious on how it would flow comparatively.

Great video. Love the office reference without even having to say it lol. But truly a great visual aid for us simple peasant type folk! Well done sir

Now that it's winter and cold, I will have some time for flow testing 😅 It would be awesome to have access to a dyno to test several different designs / ideas!

There is a "common" acceptance that boost also lengthens runner length. For example another atmosphere of boost doubles the effective runner length. I am intrigued about this slam air theory. I am planning a new intake manifold for my car and a slam air style would be easier to build instead of a lysholm plenum type.

My favorite body style cavalier. Had an 89 rs two door 5 speed in high school. It was a brand new car at the time. I wanted the z24, but that was too rich for my high-school part-time job having self. Only way I got brand new cars back then was to get a job and pay my own notes. My parents would finance them for me but I had to pay notes and full coverage insurance on them.

Did you adjust the fork on the pedal at all? Having issues with my clutch as of late, wondering if I adjust that nut if it’ll help.

Thank God I got the 4 banger. No timing belt.

Let a light perso. Drive i bet ull be at 12.20

Excellent video and a big help, so thanks! 👍👍👍😇

After cleaning, what is this kind of ticking chain sort of noise, only at low rpm? Does this noise mean something is bad in the engine?

I love you did this... It'd only be better with the square rims for the street of course

Why

z24 is under rated car very lite cars

Do you plan on doing weight reduction?

Well well well, speak of the devil.

That would have been awesome factory built Z24 Cavalier if GM would have built it and Pontiac Sunbird GT or Formula back in the 80’s and 90’s

I subscribed brother

You Sir have the Epitome of what is known as a SLEEPER! That HCat was poo PN itslef for the first 1/8th mile. Well Done! Keep up the Good Work.

So awesome, I gave up on my 3400-3500 swapped z24 dreams long ago. This makes me so happy to see. I always thought the equinox that had the 3500 with the intake that's backwards would be great for it. How many 60degreev6 people are reading this haha

I have a gm 3900 and was thinking about boosting it.

As a friend told me yesrs ago. Of your going to go mean!, Better have the green 💚

Could you bore the cylinders up enough to sleave it back to a 3.1 bore size ? Or would it bore to thin on the wall of the water jacket to be safe?

Well that sucked ! I'm buying a 1989 z24 . Unfortunately it has the 2.8. But I can switch that out or bore it up. I had the 3.1 in my last 89 z24. Both did and do have the 5 speed at least. I was going to tell you that I did trash the 2nd gear cincros in mine to back in 1998. Winding up the rpms to high before shifting. They don't seem to like that shit to much. Yeah no my X traded my Z in for a 99 lumina. I wasn't exactly excited about that little surprise. I had my z since 1993. And I still loved that car. I was no where even ready or thinking about getting rid of it. She was just to much fun. An a great looking car too. And that happened in Geneva, NY in 2002. Well earlier this week a guy sent me a message back, from a message I put on his archive about a torch read 1989 z24 I mentioned I love to have figuring he had already sold. He offered it to me for $700.00. I'm in texas now and the car is in Pennsylvania. I'm going to have it shipped here. She needs a title and some work. I'm looking forward to it. Years ago I was looking for the turbo setup they did on the Pontiac grand prix back in the late 80's. But could find out anything back then. 300 hp out of 140hp engine!That's impressive for that car. The pull has got to be Amazing

Whats your goal with the datsun? Drag? street? track? Drift? Anyway, u got a new sub

I had three z24s over the years my 98 was a 2.4 wasn't a bad driver. My 92 was a 5 speed 2.8 leather seats charcoal Grey.

Hopefully the new tach adds 10 hp. Nice meeting you today.