Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Canceling out pumping losses of throttle governed engines

Christ · 07-31-2009, 11:43 PM

You wouldn't be referring to the R18 Honda engine would you?

They offset the crank's center line in relation to the cylinder bores so that the force of combustion was pushing directly down on the cylinder and rod assembly (approximately) instead of attempting to force it at an angle. I have a D15 Honda block that I have considered doing this with, by having it milled to fit a D16 crank, but milling it with a preference to one side of the bearing journal. The problem with doing so is that I'd also have to custom build the rear main seal carrier, and the oil pump, since they're both designed to be used in standard design.

I don't think either would be too much of a problem, since the oil system could easily be converted to an external pump, with a blockoff plate and seal on the front of the crank, and the rear main seal is just placed inside a plate that could easily be redesigned and milled.

Maybe I'll try this in the next couple years, if I ever get the money to have the engine milled the way I want it.

07-31-2009, 11:43 PM	#44 (permalink)
Christ Moderate your Moderation. Join Date: Nov 2008 Location: Troy, Pa. Posts: 8,919 Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US) Thanks: 1,369 Thanked 430 Times in 353 Posts	You wouldn't be referring to the R18 Honda engine would you? They offset the crank's center line in relation to the cylinder bores so that the force of combustion was pushing directly down on the cylinder and rod assembly (approximately) instead of attempting to force it at an angle. I have a D15 Honda block that I have considered doing this with, by having it milled to fit a D16 crank, but milling it with a preference to one side of the bearing journal. The problem with doing so is that I'd also have to custom build the rear main seal carrier, and the oil pump, since they're both designed to be used in standard design. I don't think either would be too much of a problem, since the oil system could easily be converted to an external pump, with a blockoff plate and seal on the front of the crank, and the rear main seal is just placed inside a plate that could easily be redesigned and milled. Maybe I'll try this in the next couple years, if I ever get the money to have the engine milled the way I want it. __________________ "¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"