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Toymods » General Car Talk » Fuel Efficiency Between Rotaries and Pistons ..???... Show: Today's Posts  :: Show Polls  Email to friend

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Esteban Regular Location: Brisbane - Chapel Hill Registered: June 2002	Re: Fuel Efficiency Between Rotaries and Pistons ..???... Sun, 11 August 2002 23:45 Yup, that is correct, rotaries to expend a lot of heat energy out through the exhaust. However, when it comes down to fuel economy, it all comes down to the fuel management system. eg. A badly tuned carby can waste just as much fuel on both design designs. Also, one must remember, that a rotray is really a performance engine, (Well, at least in my opinion) and as such, is usualy tuned for performance hence trading fuel efficiency for power. I dont have any figures, but I suspect an economy tuned turbocharged rotary and an economy tuned piston of equivalent capacity (I'm not opening that can of worms) both running a low boost, would achieve very similar fuel economy. I say low boost, since a lot of vehicles used in the comparisons we see, are running insane boost levels, with huge spool-up time, and extremely rich mixtures to avoid detonation. Another factor, is driving style with a rotary. They only start to sing above 3-4 grand, and keep on singing until 8+ grand, however dont tend to have as much torque down low (tho this can be fixed by manifold design of course) which shifts the drivers ger changes up higher in the rev-range, requiring more fuel for an equivalent distance. Still, I know which I'd rather Re Rensesis: I think it's still a 6-PI N/A with revised port timings, but the major difference is the exhaust is no longer peripheral. Perhaps this will address some of the above-mentioned exhaust heat-loss issues. I cant wait to see one!! [Report message to a moderator]

	Subject	Poster	Date
	Fuel Efficiency Between Rotaries and Pistons ..???...	manipulate	Sun, 11 August 2002 10:40
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	justcallmefrank	Sun, 11 August 2002 11:40
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	toyrota	Sun, 11 August 2002 22:18
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	MS-75	Sun, 11 August 2002 22:59
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	Esteban	Sun, 11 August 2002 23:45
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	Nark	Mon, 12 August 2002 01:34
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	manipulate	Mon, 12 August 2002 07:26
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	Norbie	Mon, 12 August 2002 08:45
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	justcallmefrank	Mon, 12 August 2002 09:09
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	SUPRAGTE	Mon, 12 August 2002 10:52
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	toyrota	Mon, 12 August 2002 11:18
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	Jonny2TG	Mon, 12 August 2002 12:35
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	manipulate	Tue, 13 August 2002 05:52
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	dorikin	Tue, 13 August 2002 08:08
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	[TOYROTA]	Thu, 15 August 2002 05:04
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	justcallmefrank	Thu, 15 August 2002 06:28
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	[TOYROTA]	Thu, 15 August 2002 06:50
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	justcallmefrank	Thu, 15 August 2002 06:53
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	[TOYROTA]	Thu, 15 August 2002 07:33
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	justcallmefrank	Thu, 15 August 2002 07:39
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	[TOYROTA]	Thu, 15 August 2002 07:59
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	RollaLevin	Fri, 16 August 2002 00:58
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	Sam	Fri, 16 August 2002 01:53
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	Pete	Mon, 19 August 2002 12:03
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	draven	Mon, 19 August 2002 15:45
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	AE86	Tue, 20 August 2002 03:53
	Re: Fuel Efficiency Between Rotaries and Pistons ..???...	[TOYROTA]	Tue, 20 August 2002 04:00

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