automationgame.com

Killrob wrote:Please post actual examples of engines you want to recreate and your best try to replicate them, along with the engine file.

Killrob wrote:I've taken a look at the two examples you've provided and can see what you mean, but don't understand how you can consider this as "cannot reproduce any production engine with any accuracy".

For the Corolla for instance, you peak torque earlier in the rev range, but that peak is so flat that it is basically the same value up to 4400 RPM. Also, you used forged internals, which was not necessary in this case: "cast, cast, hypercast" did the job with a quality setting of +6. It is possible to get the exact power@5600 and torque@Peak values, but indeed you need to put some fuel in. I don't see how this is a problem though, why wouldn't you put lots of fuel into the engine when running at full throttle at high RPM?

Recently I've worked out a possible additional effect/feature for the quality system which would affect the power curve via top end quality settings, basically determining the drop-off point - like when you get valve float. That is the only bugbear I still have with the engine designer - power curves not dropping steep enough when they drop. That should be fixed by that. For the rest of the NA stuff in the engine designer we are quite happy with its accuracy. Sure, there will probably be minor balance tweaks along the way, but it won't get much better without an enormous amount of effort. Getting to 95% accuracy takes as much time as getting from 95% to 98% - i.e. sadly not feasible.

autofrank wrote:1) Torque peaks too low* for some engines. *RPM
2) HP peaks too high* in some engines, and difficult to change peak to lower RPM via ignition timing. *RPM
3) Long stroke x small bore should be more torquey vs. large bore x small stroke or "square" engine (of same capacity.) - changing these values within the same capacity does little to the hp vs. torque output.
4) Building engines in earlier years (40s-60s) is far more difficult now, because parts do not last even with quality 15.

Despite this, I love the concept and fooling around with the engine builder can be fun.

Kubboz wrote:The myth of undersquare engine -> more torque stems from the fact that many engines that need to be torquey do also need to be compact and cheap, and that's what the undersquare engines are good at.

autofrank wrote:It's possibly also that an engine can have larger capacity in a smaller block from increasing stroke. Either way, this is what engine manufacturers claim, and the 1zz-fe is an example. It has a 'cousin' which is nearly square and has different output.