Talk:Directory:Revetec Cam-Drive Engine
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Lovely website, and it's nice to know that there is yet another way of converting linear motion to circular motion with hydrocarbons as a fuel source, but there does not appear to be any meat to these bones. Sure there are allusions to better fuel efficiency, but where are the numbers?
I found no horsepower, fuel comsumption, parts count, weight to HP, or work done to fuel burned numbers, just generalities about 50% improvement in efficiency. If there were real numbers, you would think they'd be shouting about them.
The claim is that this engine has three times the torque output of a conventional engine. What nonsence. The engine has in effect a 3:1 internal reduction gearbox because the output shaft runs at 1/3 the speed. If a conventional engine is coupled to a 3:1 gearbox it would have the same torque output. This is evident when you study the mechanism. The power output is the same as a conventional engine so how can it be more economical?
Further to my previous comments about the internal gear reduction in this engine which distort the claims. Remember that Power is proportional to Torque and Speed. If anyone is interested in Looking at a real approach to fuel economy in internal combustion engines as we know them today download file ftp://ftp.fpni.net/pub/Engine
Reply: The Revetec engine has a 1:3 gear up to the output shaft providing two strokes of the piston per revolution. It has been previously been driven off the trilobe cam shaft but hasn't been in this configuration since 2003. The Trilobe Cam can be designed to provide a 3X torque lever without gearing the engine down to 1/3 the speed. An example of this type of design adjustment is below. Not shown in the below graphic is the effect of deflected down-force from the opposing cam which also contributes to an increase in torque lever.
The X4v2 engine has recently been Independantly Tested and Certified by Orbital Australia which achieved a repeatable Brake Specific Fuel Consumption (BSFC) figure of 212g/kW-h (38.6% engine efficiency) with a best figure of 207g/kW-h (39.5%) at our requested target test of 2,000rpm with a BMEP load of 450kpa (approximately 75% load) and an air/fuel ratio of 15.2:1 using 98 RON petrol and a 10:1 compression ratio. It also achieved a BSFC figure under the same rev and load conditions using an air/fuel ratio of 14.5:1 of 238g/kW-h (34.4%). Revetec News (http://www.revetec.com/news.htm) --Revetec 19:26, 3 Apr 2008 (EDT)
