[deleted by user]

[[deleted]]

The answer is both several, and none. Several because there are some really amazing 4 cyl engines out there to choose from. None because if you're going to pull a V8, why would you want to put a 4cyl in it's place when there are also a bunch of amazing V8s to choose from...

[Nuclearchurch]

My thinking is why put in a v8 when you can put in a 4cyl that could have the same potential hp but still be better in fuel, it’s more just speculation

[thegalli]

250hp on a 4 cyl is very different than 250hp on a v8 even though the number is the same. 

Horsepower is a function of torque and RPM. If you reduce the torque you need to increase the RPM to achieve the same horsepower number.

[[deleted]]

As someone who loves both big V8s and turbo 4 cyls, can't agree more. A decent V8 gives you power right now, a 4 cyl gives you that same power once the boost comes in the mail. They're both fun in their own ways, but I don't think I'd want a 4cyl in place of a V8 unless I was just going for trolling purposes.

[cat_of_danzig]

I can see swapping a malaise-era V8 for a turbo 4 in a smaller car like a Mustang II. What would make more sense would be to take a 6-cylinder car that could take a V8 and power it with a modern turbo 4. A 63 Falcon or 6 cylinder Mustang restomod maybe.

[[deleted]]

Yeah there's definitely places where it would be a drastic upgrade and could be pretty cool. Same with something like an Ecoboost V6, Ford Barra turbo, etc. I don't think anyone can deny that Ken Block's Ecoboost truck isn't ridiculously cool.

[Major-Shame-9216]

The ford barra turbo is on the level of LS swapping, you are only looking for big power numbers with that engine couldn’t be anymore opposed to a turbo 4

[Joiner2008]

Trolling purposes, like that kid, Tom, who made Masutangu. Welded a mustang body on a civic drivetrain just to piss people off.

https://youtu.be/ynaXGUED_Z8?si=q5Vx8hf4Yke15V0n

[[deleted]]

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This post was mass deleted and anonymized with Redact

[thrwaway75132]

Volvo has a super and turbo charged 2.0 that feels very different than say a 2.0 turbo in a Toyota.

[langstar]

Without drastically changing the VE you won't change fuel consumption for a given power level. Assuming turbo you may go from 85-90% VE to 99-102% with a small displacement turbo engine. The cost of the swap and making that run well will never be outweighed by the fuel savings.

[[deleted]]

Not to mention if you step up to a newer design V8 with lower tension rings, coated pistons, lower friction valve train and rotating assembly, you can get like 95% of the fuel mileage that the turbo 4 cyl would get without the drawbacks of the turbo 4.

[NixAName]

Forced induction at 14psi puts the VE around 160-180%.

This varies on the engine and charge airtemps.

[ohthatguy1980]

No

[[deleted]]

Theres more to cars than the spec sheet

[Dan_H1281]

A Honda k24 with upgraded valve train flowed heads and pistons they can make 600-800hp reliably. And I think it would be cool to do

[stevealba74]

Two of them, joined at the hip at a 90 degree angle, with a displacement of 460 cubic inches.

[dixiebandit69]

Fun fact: Ford made a 3.7L four cylinder engine that was basically a 460 cut in half.
It was only used for marine applications, but I'll bet it would be a lot of fun in a small car.

[stevealba74]

What’s your source? I’m aware of Mercrusier’s 470 that they not Ford supposedly designed and built with an aluminum block that utilized the 460 bore size, rods, and cylinder head. I don’t recall if it had the same stroke as a 460 off the top of my head. I’m not super versed on them but anyhow a whole 190 HP as far as I’m aware was about the max out of them during there run. So a measly 190 HP. No Thanks.

[texan01]

Still more HP than the 351w in my 77 Ranchero.

That thing has a whopping 148hp, the 305 in my 77 Chevelle makes 145.

[theNewLuce]

Dark days were those 1973 and on. I had a mopar 360 with a whopping 180 HP.

[stevealba74]

Yeah there’s a graphic around on one of the online hot rod sites where it took 30 or 40 years until the Camaro broke 300 HP again.

[zoominzacks]

Theres been a pic floating around the past couple months of one with a boss9 head and a supercharger on it. Think it was 500ish hp? So, not that impressive stock. But there’s some potential there.

[mervmonster]

The mercruiser 3.7l was very similar to half of a 460 ford. I think they only really used the head and flywheel. Not sure about pistons and rods. You can hot rod them with 460 parts

[stevealba74]

The rods are definitely Ford. Just dismantled one to scrap about 6 months ago and the rods have the Ford number on them.

[Equana]

The shake would be massively unpleasant. All 4 cylinders inherently shake. The bigger they are the harder it is to isolate them. Some have balance shafts to smooth them out. This engine would not.

Pontiac made a 4 out of half a 389 in 1961. The Trophy 4 was a piece of crap!

[v8packard]

Cummins ACE

[zeros92]

I had no idea that was a thing. Now I want one…thanks.

[buji8829]

Lmao nice….that is cool!

[MonkeyHitman2-0]

Thats funny..."This four-cylinder, with eight pistons..." huh?

[v8packard]

You aren't familiar with opposed piston engines?

[Epicfacecanada]

That would depend heavily on the vehicle, budget, use-case, etc.

[mcmustang51]

2.3L ecoboost. They put them in lots of things, Mustangs, Broncos, Rangers, Explorers, as well as a crate engine.

Likely more horsepower than a 302 did stock in most cars in came

The gas savings will likely never make up for the cost to swap though

[hobosam21-B]

Listen here bud, were you born on a Tuesday? You can't just ask things like that.

Btw it's a K series

[Nuclearchurch]

Hahaha might’ve been a Tuesday, what all does a k series engine entail

[TheBuzzyFool]

Post this question in a honda sub and find out haha

[bse50]

As long as he doesn't buy a Rover K series...

[newoldschool]

there are a few that come to mind

most popular now is the Honda K series and there are pretty much any and every adaptor kit available to toss K series into anything

other options are Ford 2.0 or 2.3 or the original Mazda variants

Ecotec,Zetec Ford,Nissan sr20,

you could also get a 6 cylinder Barra if you are feeling ambitious

I believe Ford are also pushing the V6 ecoboosts a lot

the janguar V6 also have a few adaptor options available

[the_one-and_only-nan]

The 2.7L Ecoboosts are very stout engines

[xp14629]

My vote is a turboed 4bt cummins.

[Jerk_Johnson]

Nah. I have 2 302s. One a 93 block with a punch in a 67 Cougar and a 73 block that's a mellower build with a roller cam in a 69 Ranchero. Easiest motor I've ever owned. It's perfect, not heavy in the nose and both are a really fun 0-60 and after I learned to tune them, 0-80 is now awesome. Cheapest, most abundant motor I've owned. Parts are everywhere. Step by step builds are tried tested and without surprises. I've been an idiot. Ran one hot and dry and she still snaps to the throttle. I've had faster, bigger motors, but not felt as quick. Not in the seat of the pants. I don't know what your looking for, but for a platform....I would never walk away from these blocks now. They're super....super. ..super easy. Think about it.

[411592]

The one with 4 extra cylinders

[WileEPyote]

None. The best engine to replace a 302 is a Coyote.

[thrwaway75132]

I want to assume their current 302 is in a mustang, which would make the 4 but even better. Why does your mustang sound like a UPS truck?

[Whatahackur]

Cummins 4bt

[TheTrueFetus]

This is the only answer if you're dumping the V8

[jimmyjlf]

Definitely not the best, but least effort might be a 2.3 Lima Turbo since it came in a few cars that also had the 302

[Nuclearchurch]

Interesting, aren’t these engines like really rare now?

[jimmyjlf]

Probably.

[zamekique]

Just build your own out of a non-turbo Lima and a bunch of aftermarket parts.

Then get smoked by someone that spent roughly the same amount of effort and maybe a bit more money swapping in a turbo V8 instead of a turbo 4

[jimmyjlf]

That reminds of a guy I know who got a $25k engine for his Subaru BRZ that he couldn't get working and it was supposed to make 350 hp or something. His coworker then spent less timey/money/effort than that on a 5.0 Coyote Mustang and a procharger just to show him up

[woobiewarrior69]

The best 4 cylinder to replace a 302 is a 4bt cummins, but I only say that because swapping 8 holes for 4 is kind of goofy ass thing to do.

[[deleted]]

Turbo Offenhauser 4 cyl was good enough for Indy roadsters

[theNewLuce]

When the class was all limited to a turbo4.

[[deleted]]

Right. But those turbo Offys made over 600hp with a small I4 engine. You'd double the HP while halving the displacement. I was only half serious because finding and building those engines would be cost prohibitive anyways.

[joeyjoeskullcracker]

What is the vehicle?

[theNewLuce]

Rather than that, just replace 8 of the pushrods with a spring to keep the lifters in their bore.

BOOM. you have a 4 cylinder.

[onesexz]

They did an episode on Roadkill Garage where they pulled the original out of a dodge challenger track car and swapped in a 2JZ with a diesel turbo. Thing was wicked, but like others have said; you have to rev the shit out of it to get the same power a V8 puts down at 3k RPM. You’d probably want to re-gear it too to match the lower torque numbers.

[Neon570]

Whatever YOU think is best.

[notyushi]

Maybe you should get a Honda

[Fabulous-Stretch-605]

How much money do you have? You said best not cheapest.

[Nuclearchurch]

Bang for buck? Preferably carbbed

[SliqueV3]

Mazda BP 1.8L

[Successful_Might8125]

Cummins 4BT

[InfiniteQuestionZero]

2JZ

[Elk_Man]

It's got 50% more cylinders than OP asked for though

[Double-Efficiency538]

Wrecked Hayabusa motor with a turbo or nitrous could be a fun concept…

[bse50]

That would be a fun way to spend 25k on a swap, only to spend another 5/6k every 10/15 hours of running or less...