Help us out: Engine Designer Revamp

The bore for I4's is limited to 100mm (it my change) but V8s and other engines will have the option to have a bigger bore. They have mentioned 12L V8s before

[Daffyflyer]

I think with this overhaul we will up the max bore and stroke of everything, but we need to introduce some severe vibration in things like 4.0L inline 4s

VVT on 5 valves is coming.

Fuel mixture can't have a value as it would be changing all the time, under load at high rpm it might be 11:1 but at cruise it might be 18:1, the fuel mixture slider represents "On average, how rich is this engine tuned"

Yeah, exactly. I find fuel mixture difficult to tune. The help window says: "A ratio of 14.7 parts of air to 1 part of fuel is... the ideal ratio..." How exactly can we make this ideal ratio with a slider from 0-100? It's too complex to use in this way, unless the slider represents the amount of air:fuel, so 14-15 represents 14.7:1 air:fuel?

It doesn't work this way though, does it?

[Daffyflyer]

Yeah, that might just need better explanation. The air fuel slider is about how the engine is tuned OVERALL, because as I know from tuning my car, its not like an engine just runs a paticular air fuel ratio all the time, when i'm on light throttle the MX5 will hit like 16:1, but under high load/full throttle more like 12:1.

This isn't the most intelligent reply, but it makes up for it with some awesomeness.

Issue description: No fire out of the exhaust
Possible solution: Add fire out of the exhaust during backfire
Important because: Because FIRE!

[Daffyflyer]

Already got that one in mind, because of the same reasons you stated

VVT on 5 valves is coming.

Fuel mixture can't have a value as it would be changing all the time, under load at high rpm it might be 11:1 but at cruise it might be 18:1, the fuel mixture slider represents "On average, how rich is this engine tuned"

Yeah, exactly. I find fuel mixture difficult to tune. The help window says: "A ratio of 14.7 parts of air to 1 part of fuel is... the ideal ratio..." How exactly can we make this ideal ratio with a slider from 0-100? It's too complex to use in this way, unless the slider represents the amount of air:fuel, so 14-15 represents 14.7:1 air:fuel?

It doesn't work this way though, does it?

Hi everyone!

I too think the fuel mixture slider is confusing, but I guess "fixing" it would require more complex mixture tuning procedure than you have planned for this game. I would really love to see more realistic adjustments with many things, like cams and ignition timing (degrees anyone?) but if you are only going to make this game semi-realistic I guess my complaints won't matter.

It would also be great if the external size of the engine was shown as the displacement changes are made. Having to keep going back to testing and running it to see a change when doing that schenario with limits on the size was annoying.

Adding in a slider for factor of safety. There are somethings that we cant choose that effect the reliability of an engine, like cylinder bore lining thickness, rocker strength, etc. And those can be a reliability vs lightness vs cheapness type thing.

I've noticed that when I am working on a pushrod engine and turn up the compression, one of the valves disappears into the piston head.

A few humble suggestions here, things that bothered me after playing all the fantastic scenarios:


#1 : Dyno graphs: It seems the hp calculation is off. If calculated correctly the hp and torque will be equal at 5252 rpm.. Which it is not. Since low end torque (should) have a big influence on economy and emissions, this is actually a major issue for the realism of the engine..

#2 : Flywheel wheight: "normal" wheight is ~18KG in I4 engines.

#3 : Its all in the heads - The heads should be given more options. Port size, port angle, valve size, chamber shape and even intake runners have a very high impact on an engine. Perhaps adding those up in a single line adjusterbar for simplisity maybee named "agressiveness" or something. Either way they are to important to disregard.

#4 : Ignition timing: Sorry, but Ive tuned 1 million engines, and not once had a max ignition timing of more than 36 degrees. Also options like old points, early age electronic, ECU controlled and even amplifiers, COP or dizzy ++. These are highly important for both cost, emissions and power.

#5 : Compression ratio: It seems to be very hard to gain power with high comp engines. Increasing cam duration should have an higher influence on RON when you have high compression engines. I would therefore suggest to implement 2 factors in camshafts, Duration and lift. Research shows that the lift (among many other factors) determines the power of the engine, while the duration tells at what RPM you get it (if nothing else change). But higher duration allows for more compression/ignition timing etc and can allow even higher power at the expence of economy ++. This becomes even more a factor in turbocharged engines. Dont forget though, higher lift will increase overlap.

#6: OHC seems to have an advantage over all other designes when it comes to power?

#7 : AF ratios: This should just be removed. Perhaps a cost for tuning effort could be used, but in general any carb will give poor fuel mixture at practicly all RPM`s while a multipoint fuel injection gives great mixture at all RPM`s.



Thats it for now. Great game though, cant wait to see it complete!