It seems like there are a lot of moving parts. How can there be gains with so many moving parts?
There are more moving parts. However, an increase in moving parts does not mean there has to be more friction. Where friction is concerned one has to look at the distances that the areas of oil being sheared have to travel, oil viscosity, and what part of the Stribeck curve is in play. The Brickley configuration reduces friction in several ways. First, it eliminates the piston skirts. As well, it eliminates a number of crankshaft main bearings and crankpin bearings. It also connects the cylinders to each other through a pinned linkage, each pinned joint rotating only a small amount, thereby significantly increasing mechanical efficiency.
How much will the Brickley engine weigh compared to a typical engine?
It is expected that the overall engine weight will be less than the typical engine. While there will be a small increase in the reciprocating mass, the Brickley crankshaft will weigh a fraction of the typical engine’s crankshaft.
Is the Brickley design limited to four cylinder engines?
No, the design can be expanded into many other multi-cylinder engines. For example, an eight cylinder engine could be made by extending the crankshaft and putting another bank of four cylinders directly behind and existing set of four. While the design is not limited to a multiple of four, it does lend itself well to multiples of four.
Is the Brickley engine patented?
Yes, the design is patented and there is further patent work pending. The patent number of the parent patent is 7,219,647.
Could this engine design be applicable to diesels?
Yes, the design lends itself well to a diesel engine. Not only do diesels operate at lower rpm where reciprocating mass is less of a design issue, but as well motoring friction is about 60% more in a diesel engine compared to a spark ignition engine. So the gains may actually be more for a diesel engine than for a spark ignition engine.
How does this design compare with other designs of improved efficiency?
Because the Brickley design finds its gains without the complications of complex new technologies or additional fuel distribution systems nationwide, it is expected that its introduction could be made quickly, and without the difficulties that other designs require. Furthermore, the value of other technologies could be enhanced were they used in conjunction with the Brickley design.
How accurate are the projected gains?
While all of the numbers on this site are projected, none of the calculations are expected to be far from what will occur in the actual engine. It is important to mention that a number of engineers have looked over my approach to calculating the gains and there has not been one who has disagreed with the expected gains.
The following bibliography includes a great deal of technical information that is relevant to determining the expected gains. Many of the papers are available on the internet. Look at the science for yourself. Come to your own conclusions
T. Austin, R. Dulla, and T.Carlson,”Alternative and Future Technologies for Reducing Greenhouse Gas Emissions from Road Vehicles,” Sierra Research Inc., July 8, 1999.
J.-L. Ligier and P. Ragot,”Piston Pin: Wear and Rotating Motion,” SAE paper 2005-01-1651, April 2005.
M. Noorman et al.,”Overview of Techniques for Measuring Friction Using Bench Tests and Fired Engines,” SAE paper 2000-01-1780, June 2000.
R. Taylor,” Lubrication,Tribology & Motorsport,” SAE paper 2002-01-3355, Shell Research Ltd., 2002.
R. Taylor,” Engine Friction Lubricant Sensitivities: A Comparison of Modern Diesel & Gasoline Engines,” Shell Research and Technology Centre, 2000.
G. Livanos and N. Kyrtatos,” A Model of the Friction Losses in Diesel Engines,” SAE paper 2006-01-0888, April 2006.
M. Hoshi,” Reducing Friction Losses in Automobile Engines,”Tribology International, Vol.17(4),1984, pp.185-189.
C. Sethu et al.,”An Investigation in Measuring Crank Angle Resolved In-Cylinder Engine Friction Using Instntaneous IMEP Method,” SAE paper 2007-01-3989, 2007.
M Skjoedt et al.,”Effects of oil properties on spark-ignition gasoline engine friction,” Tribology International 41 (2008) 556-563.