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My idea of a fuel-efficient engine. It has a good power to weight ratio in combo with decent economy, and it still packs much more power than your Prius (for a teenager like myself, that's essential).

Please feel free to constructively criticize, and post your creations!

The biggest problem I can see with this engine, is the transmission set up to get the best " fuel economy " It is a very nice engine, but the fact the lowest fuel used when the A/F ( air to fuel ) is the best, is high RPMs.. but still hovering around the .4 areas in other RPM ranges is pretty nice too, just a much lower curve of power

Not a bad engine at all. I'm guessing you're using low friction pistons which are limiting your redline. I used light forged so I could rev higher, which hurts fuel economy a bit, but it's still at 25% efficiency while making over 100 horsepower per liter.

I made this one a few weeks ago, working on a theoretical big rig engine. I changed the compression and manifold only for this thread


I can squeeze out an extra 3% economy by switching to low friction pistons and only lose 5 hp and 3 ft-lbs but I take a huge hit in MTBF that wouldn't be worth it in a production engine

The fact that your engine costs more than 6000 dollars and requires more than 3000 manhours to build makes it completely useless for production anyway.

That is true haha! I never saw that and was looking at the engine going "wow thats soo good" I think I know why now

Depends on his tech pools though if that engine gets built in a company that has sunk all its R&D budget into only engines, these number would come down to something more reasonable but yes, you're right.

The manhours calculation doesn't really make any sense to me. I'm not using alien technology in that build and have done similar builds (ie. big fuel injected V8s) by myself in my garage in a week. I've seen Mike Finnegan do crazier builds in 3 days. The only way I could see 3000 manhours being the case is if we're forging and milling each part as we need it and we're factoring in our union allocated break times.

As for price, look at any off the shelf crate engine. You'd be hard pressed to find any example in the 900+ horsepower range that doesn't cost at least $10,000 by the time it gets to the consumer. One of the real popular crates, the Mopar 440 Super Commando, will run you around $13,000 and you only get 530 or so horsepower out of it.

If anything I think what makes it useless for production is the fact that it's got more power than literally anything that doesn't cost a million dollars and on top of that can't run on pump gas

At the moment i think the idea is that your a startup company, with a few employee and a couple of old lathe's and ur making every part from scratch. This is why there is high man hours but once u get a full factory and higher tech pools they will drop(i presume)

Well, the manufacturing time includes the parts manufacturing time. It also takes the rigorous quality testing and rigorous dimension tolerances, etc in account (You are so precise that significant fraction of parts do not meet your company norms and get scrapped). Of course, uber-advanced manufacturer, with lots of money spent on engine research can get more precise machines, etc, getting those ridiculously high man-hours down.

That's what I believe the way of things is, anyway.

How I view it in the man hours and cost discussion is I'm going to make my company specifically bottom end based all my money for R&D sunk into bottom ends.. so any engine I make now has a high man hour and cost due to the fact it is likely basing it off of the crapiest factory KNOWN in the game.

ah thanks for the info, here is my attempt at effienct and powerfull(well 2 atemps)