Introduction
#29 ·
ref Gary Hammond quote "Other benefits include the capture and reuse of piston blowby, and preheating of the intake charge for better fuel vaporization"
great idea for sure and should be revisited.
what temperatures did you see in the charged air from your design.
I can see how it worked on a flat 4 .
However I can see a number of problems that would need to be addressed to achieve any reasonable service life from the engine.
On a factory designed inline 4,5,6 cylinder, v8 ,v10 , v12 etc engine you would need some major redesign work due to the negative effect of apposing piston stroke on a open block design which would cancel out the positive pressure cycle,the need to chamber each individual cylinder into compartments throughout would be required.
Issues with increase back pressure would force atmosphere into oil system via all open internal oil journals and thus reduce oil flow due to pressure difference, probably best to require supply and return oil ways with seals.
problems with piston ring oiling / sealing due to crank side pressure , probably different tolerances required and sealing redesign for correction.
Any major boost increase would require either doweled / pegged oil seals or retaining plates to stop outer oil seals being forced out .
The oil starvation issues can be partly over come with a proper dry sump setup , remote oil reservoir, multi stage oil pump and collection system.
Piston to cylinder wall lubrication would need some fancy work.
Gudgeon pin lubrication would need separate supply and return oil ways & oil seals to reduce oil vapor and positive pressure reversal causing reduced lubrication.
The concept is totally possible as you have proved but without complete block , crankshafts, conrods etc being redesign to deal with much of above , and as you stated you found the engine very close to failure due to oil lubrication problems, ouch.
have you gone any further with the design since.
great idea for sure and should be revisited.
what temperatures did you see in the charged air from your design.
I can see how it worked on a flat 4 .
However I can see a number of problems that would need to be addressed to achieve any reasonable service life from the engine.
On a factory designed inline 4,5,6 cylinder, v8 ,v10 , v12 etc engine you would need some major redesign work due to the negative effect of apposing piston stroke on a open block design which would cancel out the positive pressure cycle,the need to chamber each individual cylinder into compartments throughout would be required.
Issues with increase back pressure would force atmosphere into oil system via all open internal oil journals and thus reduce oil flow due to pressure difference, probably best to require supply and return oil ways with seals.
problems with piston ring oiling / sealing due to crank side pressure , probably different tolerances required and sealing redesign for correction.
Any major boost increase would require either doweled / pegged oil seals or retaining plates to stop outer oil seals being forced out .
The oil starvation issues can be partly over come with a proper dry sump setup , remote oil reservoir, multi stage oil pump and collection system.
Piston to cylinder wall lubrication would need some fancy work.
Gudgeon pin lubrication would need separate supply and return oil ways & oil seals to reduce oil vapor and positive pressure reversal causing reduced lubrication.
The concept is totally possible as you have proved but without complete block , crankshafts, conrods etc being redesign to deal with much of above , and as you stated you found the engine very close to failure due to oil lubrication problems, ouch.
have you gone any further with the design since.