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Posted on 12/09/2025 8:20:29 AM PST by Omnivore-Dan
While less prevalent these days, it’s hard to not appreciate the sound of a high-revving naturally aspirated engine. The team at Boreham Motorworks just pulled the cover off their new 2.1-liter, inline-four cylinder engine. This small-displacement powerplant puts out an impressive 325 horsepower and, as the name suggests, screams all the way to an astonishing 10,000 rpm. It may be small, but innovative engineering is significantly pushing the boundaries for what a street-driven engine can be.
(Excerpt) Read more at enginelabs.com ...
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Hopefully it will make it to the street soon.
Looks a lot like my Toyota 4AGE in MK1 MR2.
Sounds expensive, but I want one.
is RHD so it would take some getting used to but I am willing to learn.
Indeed..., Offenhauser 4-cylinder engine achieved a maximum output of 1,000 horsepower in its turbocharged variant during the late 1960s.
2.1 litre = 128 cubic inches, 325 hp. That would be similar to a 4.3 litre Chevy V6 making 650 hp, but you could not get 10,000 rpm out of the V6 Chevy. Very impressive indeed.
I wasn’t aware of Offenhauser making engines, I thought they just made high performance parts, not complete engines.
How many cubic inches or litres was the Offy engine?
I know a lot of folks like the roar (or whine for the 4 bangers) of high rpm, but I love the feeling of a full size Chevy 350 cruising at 95 mph at low RPM like it is not even breeaking a sweat.
What kind of gasoline does it use?
Same. Plus I like a vehicle that will go 300,000 miles easily.
Big fan of naturally aspirated inline engines. KISS.
Higher RPMs equals shorter life span.
I’m a big block fan myself, had an Olds 455 bored and stroked to 476 c.i. Ported heads, 2 4 barrel carbs, lumpy cam, open headers. It was music to my ears.
Most likely premium, high test.
“Higher RPMs equals shorter life span.”
Not if the engine is built for the rpms.
Over the years I have transitioned from cars with V8 engines, to V6 to 4 cylinder to now to a 3 cylinder with turbo. While my 3 cylinder Chevy will not light the tires like my old 396 SS Chevelle, it drives just fine and gets me down the highway at the speeds I drive at close to 40 mpg. In my old age I also appreciate the comfort and convenience and especially the phone apps that connect me to my car. Old timers like me also remember those every 10,000 plug and points replacements, finicky carburetors that were never quite right, and frequent oil and coolant changes …now all replaced by better technology.
Not always. With CNC, balanced crank, decent bearings, good oiling system, there are engines that can rev 10k all day long, but they will most likely bust the budget of most people.
Exactly.
I know nothing about Offenhauser except they made competitive engines for race cars.
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