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  1. SMOKEY44211

    Piston structure design

    What happens is some of the air/fuel charge gets trapped in the cevice volume. As the force of compression rises more is trapped. After ignition event still more. If we are using conventional rings, especially at light throttle, some is going to escape past the rings contaminatting oil supply...
  2. SMOKEY44211

    Piston structure design

    Also failed to mentioned reduction in unburned hydrocarbon count.-------Phil
  3. SMOKEY44211

    Piston structure design

    Forgive me negleted to include that those gains are achieved by crevice volume reduction.----Phil
  4. SMOKEY44211

    Piston structure design

    Consider also top ring placement and piston crown diameter. There's 1-2% power increase and fuel consumption reduction compared to OEM offerings.------Phil
  5. SMOKEY44211

    Diesel fuel possibilities

    I think fogging in hydrogen will get you what you are after.-------Phil
  6. SMOKEY44211

    Another Bore vs Stroke question

    My vote is for small block, More favorable bore/stoke ratio. ----Phil
  7. SMOKEY44211

    Hydraulic roller lifter failure

    I've done a fair amount of engines dedicated to using propane and CNG fuel. Most of them use sodium filed exhaust valves. Also I've seen exhaust springs that lost most of their pressure due to overheating. Overheating was due to diminished splash oil supply to provide cooling. Those springs also...
  8. SMOKEY44211

    Hydraulic roller lifter failure

    Sounds like a logical conclusion. Install hardend seats?------Phil
  9. SMOKEY44211

    Scuderi~Split Cycle Engine, anything to it?

    Good eye Greg. I failed to notice that.-----Phil
  10. SMOKEY44211

    Scuderi~Split Cycle Engine, anything to it?

    Update. They are now posting BSFC numbers on their website. Looks like 233gr/Kwh with turbocharger. Malbeare I agree with your thinking. Looks like someone within the organization is starting to get it.------Phil
  11. SMOKEY44211

    Why not have 2-stroke Diesel with exhaust port intake valve?

    Check thread 71-281562 You may be able to garnish some information it.----Phil
  12. SMOKEY44211

    Scuderi~Split Cycle Engine, anything to it?

    I'm a little behind the curve when it comes to high tech. Just got a rotary dial cell phone.----Phil
  13. SMOKEY44211

    Hydraulic roller lifter failure

    The clue of micro welding suggests lack of lube. The axle of the roller relies on splash oiling thrown off the crankshaft. Some oil will migrate down from the clearance between lifter and bore, but there may not be enough that makes it to the axle. The aftermarket cam co. Iskedendrian has a...
  14. SMOKEY44211

    Scuderi~Split Cycle Engine, anything to it?

    I was able to get BSFC #s from one of thier engineers at the SAE conference in Washington D.C. last year. 296g/Kwh. Nothing spectacular. Have to give them credit for thier ability to raise money, too bad they're flushing it down the toilet on this dog.----Phil
  15. SMOKEY44211

    Wrist pin bushing material

    If I may digress to my original response. My suggestion is to install a steel bushing in the small end if the rod. The final sizing would be smaller then the wrist pin thus the term "press fit". This method is used by most engine manufacturers. The practice when rebuilding such an engine is to...
  16. SMOKEY44211

    Automotive automatic transmission temperature ?

    240-250F is ideal. Has to be above 212F to boil off water condensation that may occur via vent. ------Phil
  17. SMOKEY44211

    Wrist pin bushing material

    The smallest wall I've seen is .030". Consider going to a press fit. Unless you are going to assemble and disassemble it routinely much greater load carrying capability. -----Phil
  18. SMOKEY44211

    Ideal coolant temperature for fuel economy?

    A large percentage of the power gains observed is directly attributed to the oil control techniques. In this case there was 35 hp @ 5900 rpm gained. This engine produced 110 hp in un modified form. Final form with all the modifications noted on earlier post was 155 hp. There is a lot of power...
  19. SMOKEY44211

    Ideal coolant temperature for fuel economy?

    Optimum air inlet temp.for reasons of fuel economy is SI gasoline fueled engine is 450 deg. F at full throttle normally aspirated. ------Phil
  20. SMOKEY44211

    Ideal coolant temperature for fuel economy?

    The particular engine example was was a 2.2 GM 4cyl. TPI fuel injected. They have a history of head gasket failures. They were found in Caviliers and S/10 pickups from mid 90's through 2004. Just a 2 valve pushod engine. They make good guinea pigs, cheap and plentiful. I have no doubt that at...

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