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Posted on 12/09/2025 8:20:29 AM PST by Omnivore-Dan
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It was a closed club for decades until Lotus flipped their applecart.
Note there is no mention of powerband or low rpm torque.
Both things you need to get a car rolling.
“great power across a high RPM range”
Note there is not description of just what that range is.
That would be awesome.
325 hp is already over the top but the light weight of that engine is just insane
The weight distribution on a 7 would be almost mid engine territory
“Offey’s” were interesting mono-block designs. There was no separate cylinder head so no head gaskets to blow. Later models of the 168ci engine made about 1000 HP. Just my $.02.
Nope. Put this kind of engineering to a big-bore V8 and we can talk.
Amazingly, the Toyota 4AGE engine was a Toyota copy of the Cosworth BD four valve engine with a refined cylinder head tuned by Yamaha .
Toyota turned it into a production engine
Great engine
Toyota did a great job of integrating the design into a PRODUCTION high performance engine, including affordability.
I don’t know but my ‘09 Civic SI redlines at 8K. I’m at 200k and going strong. I do a regular oil change w/ Amsoil. I love it.
More HP equals shorter lifespan. This is why the big diesel engines come in various HP packages. The million mile rig engines have less hp then others. Also one of the reasons the cummins isb in a cab chassis ram averages 150k more miles before a rebuild vs the pickup engine
Your engine probably has a bore and stroke measured in feet.
Thanks, I will have to check it out.
Brain clog, it was 12 cyl and 57000 hp. I’m thinking 1M bore and 3M stroke. It was said the turbo chargers had the power of a 747.
Their standard engine was a four cylinder in line.
However, Offenhauser also manufactured six cylinder and eight cylinder, both in-line and V type engines.
“The Offenhauser engine, commonly known as the “Offy,” was developed in the 1930s by Fred Offenhauser and Harry Miller, originally as a marine engine. It became highly successful in American open-wheel racing, dominating events like the Indianapolis 500 for over 50 years, with its design evolving to produce remarkable power and reliability throughout its history”.
I see they went with a belt instead of a timing chain. Smart move. Those downsized chains these days are nothing but a liability.
Redline is 1000 rpm or less, I would imagine. That’s a stroker!
97 rpm was operating range,we did go over 100+ when we were in a hurry. It was direct drive to the propeller, no transmission. I think 22’ dia prop or close to
I assume that the only difference between higher horsepower rigs and lower HP ones is turbo boost pressure, right? And rpm gas engines probably run higher compression ratios to achieve max HP and torque numbers in a higher rpm range to match desired transmission gear splits and final gear ratios. My point is that higher reving engines are built to match the entire drive train in purpose built vehicles primarily for acceleration. Impressive high rpm engine vehicles accelerate quickly but have enough torque to maintain drivability in overdriven cruising.
A coworker had a VW, I’m not sure which model, but the timing chain had to be replaced every 10k miles. Of course they didn’t tell her that when she bought it.
In a retro Ford Escort, if only the steering wheel was on the left, I would seriously consider one:
https://borehammotorworks.com/ford-escort-mk1-rs/
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