Lawn mower carb on V8 + dynamic carb controller
 

https://youtu.be/1xHQWu2ZzPc

Surprised I didn't see this posted somewhere on ecomodder yet (unless I just didnt find it). This guy seems to have a pretty good knowledge base.

I am in no way affiliated with him or anything, just happened to see his stuff on youtube.

I hadn't seen your post so I accidentally cross-posted about this on central. Hopefully we get some discussion going about this on here. Is he pulling our leg or is this for real?

He's scamming and trying to sell another super FE Carb. Got give it to him hes making some $$$ on YouTube

A 36 mile test isn't going to prove anything. Fill the tank and at least go 300 miles for a real test.

Yeah, the more I thought about it the more this seemed like a grift.

lawn mower carb float-bowl capacity
 

Seems like, on the very first intake stroke, the float-bowl would be completely emptied of fuel.
They'll only run a lawn mower to 2500-3000 rpm, under load. My 1.3-liter Honda CRX was rated at 6,000 rpm. A four-banger, not a one-lung'r.

Well several months later the guy hasn't tried to sell anything. The lawnmower carb V8 has been on the dyno, he took it on the powertour which is what 1,000+ miles, so it works and thousands of people saw it in action.
This shouldn't be in the unicorn corral.

carb
 

I'll revisit the thread next week. I haven't seen a word yet about the carb.

The carb is absolutely nothing special, probably a 16 to 20hp horizontal draft lawn mower carb, no special inside mods. The only thing kind of interesting was his O2 sensor feeding back to an idle air control to trim the air fuel mix.
It's all junk anyone can buy off ebay, down load off the Internet or 3d print them selves.

3D print, you say?

https://www.thingiverse.com/thing:4304481

Carburador de Fusca Brosol Solex 32 VW Beetle Carburetor
by scalla3d April 22, 2020

https://storage.googleapis.com/stlfi...db83de_200.jpg

The philosophy for the VW Beetle IIRC was a 'large' displacemant throttled by the intake and pea shooters. The 36HP had a single 28mm, eventually the Type II had twin 32s and tuned header lengths inside the stock muffler.

Not the carb, for the thunderhead289 guy.
He 3d printed the intake adaptor plenum and some throttle linkage parts. The carb was die cast chinesium.
He's pushing 40mpg without lean burn, one of those guys that thinks running lean is bad. Used to be me too.

It definitely should be in the unicorn category because we haven't seen any extensive real world MPG testing. Leading up to Power Tour he had months in which to do so. All I ever saw was one exit to exit freeway test. Hardly comprehensive. I also didn't see a report on his mpg while on Power Tour, which would be an excellent event to collect highway mileage data. I'd be thrilled to see it work, but until I see real evidence and independent testing, I'm very skeptical of the 40 mpg claim. Everyone else should be too.

Also, you say he's not selling anything, but he cross posted the same video like 5 times and got a million views on a couple of them. That's a decent amount of advertising revenue on YouTube. He's already making money off of it. At this point pending further evidence, my assumption is that this is grift.

Seems easy enough to confirm or bust.
Might be something I could test on my firebird when I get the T56 back in it.

Love this idea. I don't have the setup or know-how to make this happen, let alone a vehicle to test it on (all my vehicles are EFI).

I was excited when I saw the video, but when I saw that he posted the one video and instead of doing more testing he just kept posting different versions of the same video repeatedly, my spidey sense started tingling. Like I said above, he has had more than enough time to test, and honestly, with the price of gas these days, all the incentive in the world to take advantage of the great mileage. That is, unless it's a BS clickbait prank video just for the lulz and/or the few bucks in ad revenue he's getting off of it.

My vehicle is EFI.

videos
 

I've watched two of the videos. I'm a fan of what he's done.
I'll watch all of them, and try to piece together the particulars.
As I've never owned anything but a 21-inch push-type mower, the title threw me off at first.
Riding mowers are a completely different animal.
One of the qualifiers for my CRX's 52-mpg, was the 12-valve head, and tiny ignition pre-chamber which lit off a rich mixture which lit off an adjoining lean mixture, allowing the car to cruise on it's 'primary' venturi.
You had to bury the throttle pedal to get into the secondary, while simultaneously down-shifting to get onto the cam. A real gutless-wonder!
If he's reading his sparkplug color he'll be able to check his jetting.
The famous 'vapor' carburetors all sacrificed power, speed, and utility on the alter of mpg.
Some guys I've known defeated their Rochester, Holley, and Carter 4-barrel secondaries, happy to loaf around at lower 'performance.'

My father in law was famous for this on his 440 powered Dodge Ex CHP police interceptor and a thermoquad.

I never understood his economy thinking: $500 dollar worn out car built for performance doing every stupid trick in Mother Earth news to try and get it to 20mpg. Premise and execution were suspect.

He retired and bought new a ford midsize that got 25 on a 4 banger, had A/C and cruise control.

Mother earth didn't have access to a wide band O2 meter and there were no six speed transmissions that would fit in a car back in the day.

I have a single barrel horizontal draft carb for an 18 to 21 hp mower.
Main problem is my odometer is broke. But I can probably figure it out.

Manual with a Brownie fit. Friend had one, 12fwd, 3r behind a buick straight 6. Pretty sure MEN wasnt concerned about stoimetric but O2 was available in 1980 on Eldorados

Narrow band O2 will only get you really close to 14.7:1.
For best MPG we want at least 16:1.

Interesting that you mentioned VWs. Some folks fitted Beetle carburettors to V6 engines such as the Mitsubishis ranging from 3.0L to 3.5L and even to the 4.3L GM Vortec in my country. Not to mention all the cars with 3-cyl and 4-cyl engines ranging from 0.8L to 2.0L resorting to the carburettor of a motorcycle between 125 to 200cc which is a quite common setup too...

Chippies
 

One thing lost on the So-Cal MOPAR hot-rodders was that, the CHP interceptors had really good 'BRAKES'!
Not only would they 'really go', they'd 'really stop' too.:D
In the day, Chrysler Corp, was still highly regarded for it's engineering prowess.
It's funny that our neighbor's Jaguar was a 'hemi,' our Honda motorcycles were all 'hemi's, yet, it was mostly regarded that MOPAR was the sole proprietor of the technology. Still is.

Because the term Hemi was patented and trademarked?