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