Recent content by obanion

I'd like to build a Vigas roof. Anyone provide any tables to determine the number of Vigas I will need? I'd like to have a 20ft span for them, and hope to use ~8" diameter aged pine vigas beams. For 40lbsf loading on the roof, how close would the vigas beams need to be to each other? 4,3,2 ft...

Ah, just discovered most starting fluids are a mix of heptane and ether. Probably buy that.

Finally found some pertinent research papers on the subject, to confirm my suspicion. Diesel fuel, although having a near ideal autoignition for my test motor (10.5:1 compression) to achieve HCCI, the very poor evaporative, boiling, and mixing ability of diesel makes it impractical. I'm likely...

SBBlue, I said injection, as in PORT injection, like gasoline in a spark engine. This gives me precise control which I will need as fuel flow is load control, but allows the fuel and air to premix before/during compression, so I can have a HOMOGENOUS mix, for HCCI. Sorry about the confusion. I...

Hmmm...from the presentation here: http://www.windsorworkshop.ca/downloads/TomRyan.PDF I get the impression he used a 10.5:1 compression motor and got HCCI operation with regular diesel fuel. I might give it try. Switch to a second set of injectors, injecting diesel at a excess air ratio of...

Oh, as for timing control, I'm of the opinion it should be done with ONE fuel, and then use a variable amount of water injection. A very small amount of water will make a significant difference in the heat rise in the cylinder during compression, therby acting as a ignition retard. Having two...

You missed the essential aspect of HCCI.....no flame front. The whole mixture essentially combusts at the same time. So, the convential rules of ignition timing go out the window.

In HCCI, the fuel is uniformly mixed with air, usually in excess of 3:1 over stoich, and compressed until it autoignites. The fuel must match the compression ratio, or more exactly, the in cylinder temperature at a given point during compression. You want the fuel to ignite before TDC, but not...

Thanks guys, I'll look into that limitation. That was my primary unknown, the limitation of the valves.

HCCI, because of the nearly instant ignition across the entire air/fuel mix, causes a VERY rapid heat and pressure rise, compared to spark ignition. Which is why HCCI runs, at least so far to my knowledge, at lean to ultra lean burn. If you were to attempt to compression ignite a stoichometric...

Nitrous is too expensive. The cost of a 100HP shot is like $30-$40/min or something. Makes it too expensive for anything for me.

Correcting, the 1000 liter/min flow rate was the resultant O2, the actual 30% solution H2O2 flow rate in this case would be 10 liter/min.

In my math, I found 30% to be the ideal solution actually. Two reasons, cheapest and most available in this concentration. Most important reason, the heat produced from H2O2 decomposition, combined with the heat from combusting the free oxygen with available fuel, is just about right to turn all...

SMOKEY44211, I think you need to read my original post again. I was initially suggesting essentially what you said. This is a 4 valve per cylinder 4 stroke motor to begin with, and all of the valves would be used for intake, with a near bottom exhaust port. With the cams gone, and valve springs...

FYI, I think a Eaton M112 supercharger would be a PERFECT match to the 3L motor I'd do this with. At 1.84L/rev on the supercharger, and a 12000RPM redline, I could set the pulley ratio such that I get 3L/engine rev (thereby filling all the cylinders 100% every cycle), and be able to go to...