Recent content by jethead

Well, then I guess pre-cooling of intake air and fuel, and a good liquid cooling system will help in achieving the high compression ratio.

Very encouraging! With intake air and fuel cooling, it's definitely going to work.

Well, there's no saying that gasoline won't ignite when injected at the correct timing.

Thanks Mech. I believe it's possible after all.

My aim is to use low octane fuel in high compression engine without pre-ignition.

I read that in a diesel engine, ignition occurs when atomised diesel fuel is injected into the hot, highly compressed gas slightly before the piston has reached the top dead centre. So I was thinking that the same method of ignition could be used in a gasoline engine.

Yeah. But what I'm wondering is this: 87 octane number fuel can be used for a maximum compression ratio of 7:1 or so. Any higher compression and it'll require higher octane fuel. Could 87 RON gasoline be used in an engine that has 13:1 compression ratio without engine knocking? My thoughts-...

I haven't read or heard about anywhere, but is it possible to run a diesel engine on gasoline/petrol?

It will not mean much if it hovers motionlessly, will it?

I have thought about the same thing. At that size, ducted fans powered by electric motors or two stroke reciprocating engine will be the most efficient method of propulsion. Gas turbines will be much too complicated and the fuel consumption will be too high. After giving it a lot of thought, I...

Can a direct injection petrol engine of compression ratio 13:1, or around that much, be designed to run on fuel of low octane number, say about 87, without knocking? I think it is possible if the fuel is injected just at the end of the compression stroke like in a diesel engine. Is there such an...