Quote:
Originally Posted by bwilson4web
Usually it takes a little more torque and energy to turn a crank against a 20-to-1 compression stroke than an 8-to-1 compression stroke for identical displacement engines. Having cranked a Model A Ford before, I remember the effort needed.
<sigh>Yes of course, the 'potential' is always there.
Bob Wilson
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More torque but less duration, most diesels will start in one single compression cycle once warm, I do not know of any gasoline motors that can do that repeatably.
Quote:
Originally Posted by tjts1
Diesel prius would be stupid expensive and diesel engines have trouble meeting emissions regs when the engine is starting which a hybrid does a lot of. Besides, gasoline engine is cleaner, quieter, lighter and much cheaper to build. I would rather they invest more money into the electric side instead of the ICE. By the way, the prius already uses an atkinson cycle engine. Look that up some time.
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Your statements are mostly false, my 1982 diesel suburban once warm starts nearly instantly and emits no additional exhaust during warm startup than normal. It always amazed me that I could turn the key into start and back out as fast as I could move it and the motor always started fine. Truth be told there have been instant on/off diesel prototype cars floating around since the 80's most could start in ONE compression cycle unlike a gasser that always needs some degree of cranking duration. A simple spring was used if I remember to kick the motor off and on rapidly.
Diesel emissions are much more cleanable than gas emissions, lest we forget mining operations almost always use DIESEL equipment underground with a water wash on the exhaust because gasoline emissions are not easily made NON Lethal in enclosed spaces. On a diesel, All you end up with is a reduced amount of CO2 and water for air born emissions as compared to cleaned gas emissions which always include Carbon monoxide. Why people are unwilling to make a bit of fertilized water (which can be recovered and reused ONBOARD electrically mind you) on their diesels is beyond me, diesels DO NOT need to emit any airborne emissions besides CO2 even with high sulfur fuel with a simple water or saltwater wash. True fertilizer and water use is irritating but considerably less than smog I would guess?
Another word of note is that Diesel engines can be built for about the same price as gasoline engines, they just are never marketed that way (aka artificial inflation, lower demand). The real price difference in labor and materials is trivial. Diesels DO NOT need to be as complex as they are being made, to compete with a gasser, the emissions non-issue is what is making the problems. And the solution for diesel emissions has been known since the 40's, sadly only ocean going vessels and miners see the solution.
Cheers
Ryan