Build Your Own Intake. Or Just Watch Me Do It. Whatever.

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[rdnk]

Accurate engineering, better planning than the company I work for.

[gsmdo]

As usual Matt, you have the knack of explaining complex subjects in a way that even I can understand. As well as making me laugh regularly during your clip. I don't think I will use this information, but I'm certain my life is richer from having it explained to me. In order to make your life richer, I have sacrificed at the altar of the algorithm...

[tylertravels]

“It’s not the length of your intake runners that matters, it’s the length of your di”

Had me rolling because I didn’t see it coming.

[Papa-Bogey]

The art of half-assing it, SFM-style ... salvete omnes algorithmus.

[davidbutcher]

"... ignore the math and wing it." LOL

We built a PVC intake for my Honda engine to get the runner length we were looking for. $40 in toilet parts and glue. It works and we got 110 HP at the wheels on a dyno from an engine that's supposed to only make 115 at the crank.

[Garage]

I really love the lathey nature of those lathen runners you lathed.

[macestillmace]

I love when you lathe things, I really hope to see you lathing more parts on your lathe, with which you use to lathe things.

[Lucidbkeo]

bro I love following your builds, you don't just do a build montage, you don't just explain what you're doing as you build it, you explain it in a funny way that tricks my stupid brain into actually learning stuff! I've learned soooo much from you and I'm more than thankful for it. I'm sure I can handle a longer format video but at the same time I'm happy that you don't do that. these bite sized chunks are so much easier.

[ChadOHara]

Dude, thank your for the epic distractions from my real life. Your channel is pretty much my favorite right now.

[cheese]

I am not sure Matt, that engineering is kind of the engineering i see often on some pretty important stuff.

[turbocoupe]

I built ITBs for my 452 cu. in FE Ford. Peak torque was up 10%, but peak power, when compared to a single plane manifold, was unchanged. David Vizard has a book on intake manifold fabrication. The formulas are wrong because the assume a closed end, like an organ. Looking at your design, I think you're spot on. The intake runner inlets are as good or better than trumpets. If you need more plenum volume, you can add a spacer to the throttle body. Sequential injection will smooth out your idle. At higher rpm it turns out that the injectors are 'on' longer than the intake valve is open so injector placement and injector timing have almost no effect on horsepower. I am an engineer also, and have researched this topic a considerable amount. I think you hit the nail on the head. I also run my engine on a megasquirt. I found no difference between sequential injection and batch fire. The engine make 552 hp and 600 ft, lbs. of torque. That's lb. ft. for you younger engineers. The ITBs allow a smooth idle and smooth operation at cruise rpm when using a cam with a race profile, Try to keep the air laminar from the air intake to the manifold, and above 100 mph there is a ramming air effect equivalent to about 1# of boost. Good Luck

[Redhillmotorsport]

Rub the edge of your alloy with some fine sand paper & clean everything with acetone (including filler rod) before welding.
Also, put some tacks along the length of your part before you do a long weld, it will help with you edges burning away.

[bigiron]

I’m glad to know we both went through the exact same process of determining runner length.

[brianb-p]

Decades ago I helped a friend build a custom intake for a MG Midget using a Datsun A-series engine, based on a dual Weber DCOE manifold and an aluminum airbox with Bosch K-Jetronic injectors firing at the runners from the other side of the airbox. While using no math at all and based on very little experience, the end result was pretty similar. As should be expected it was poorly suited to low speed... but it ran, and arguably better than the carbs used previously.

[Reman]

Oh bloody hell Matt. Your super dry sense of humour never fails to crack me up. Therapist's should proscribe your channel as a treatment for melancholy. :D

I may have said this before, but huge thanks for putting in all this extra work to film, narrate, edit and upload these projects, mate. And just be aware that a lot of your loyal viewers know that if you DIDN'T do all the extra messing about needed to create your great content, you'd probably have had time to finish all your current projects ages ago.

A while back I decided to try filming myself doing a small lathe project (A simple tailstock die holder), but quickly realised that just making sure everything was in frame and lit to an acceptable level meant EVERYTHING took 3 times as long to do (it didn't help that I ended up starting one part again from scratch. Not because I screwed it up, but because the camera had spent the whole 45 minute of machining trying to decide if it should be focused on the work, the tool post, or the damn lathe bed !!!). I quickly gave up and finished the project without recording anything else. My attempt to join the (already crowded) ranks of engineering youtubers didn't even get to a point where I needed to think about annotating or editing that aborted mess of video clips. It was all just too much work and aggravation for (in my case) zero psychological or financial So once again, thanks for putting in all this extra work for us mate. Your efforts are not unrecognised.

[iownyounoobs]

I would recommend trying out pre heating the aluminum, especially considering the size difference in the pieces being welded together. It also helps prevent cracking in the future since aluminum cools fast and it can cause the weld to shrink too fast.

[slfrules]

Those top injectors remind me of the few race car intakes i've seen. One that really sticks with me had these floating carbon trumpets that rose and fell with RPM. The injectors were suspended above the trumpets but first sprayed into something like carb jets. The injectors moved in sync with the trumpets but didn't look like they were mounted to the same mechanism. It looked like it was using slide throttles mounted at the cylinder heads but somehow the trumpets looked like they were vacuum controlled.... beyond being completely confounded by controls those carb jets jumped out because of the air patterns after the jets. The fuel spread normally from the nozzles and hit the jets maybe an inch out. Then fuel/air collapsed and concentrated a bit past the jet and faned out as a super fine mist to hit the trumpet just as the diameter of the cone reached the runner diameter. I thought at the time it was for atomization but the way you explained the potential of 3 injectors feeding one cylinder i wonder now if it wasn't done to keep from crossing streams... Thanks for the knowledge!

[xcofcd]

I was working in a shop that mostly did nissan and bmw racing engines. We designed a carbon fiber airbox for a bmw S50 hill-climbing engine and we would build an variable aluminum airbox to test different configuations on a engine teststand to make it perfect...tuning on na engines can get really crazy compared to turbo engines where you just add 100hp with a laptop and a cable...

[Nomadd]

I do preliminary design for things that, if they see the light of day, will get serious engineering analysis done later. Your work here pretty much sums up my job most days.

[Liperium]

Love these. It's like my engineering/math fix, but you throw it out halfway threw the project and eyeball it. Love it!