Posted: Thu Aug 31, 2006 1:35 am
Just for comparison, on my old cannon (ABS combustion with 250ci chamber, no propane meter), I use 6-7 seconds of propane from a reasonably fresh tank and benzomatic torch head. I wouldn't think you'd need more than 10 for a 350ci chamber.
Propane is heavier than air, so when fueling, you should point the barrel downwards and put fuel in from the cleanout in the back.
What I do is open the valve and stick the torch head down inside the chamber, count to 7 or 8, pull the torch out, replace the cap, turn off the torch, aim the barrel upwards for a few seconds so the propane distributes around the chamber, then aim and fire.
Another possible problem is that the propane isn't mixing with the air very well. Putting a computer fan ($3) in the chamber solves this problem. Look around the site for insturctions on wiring it, but it's pretty self explanitory. Don't bother with a timer circut, just use a momentary on switch.
How many spark gaps do you have, and where in the chamber are they placed?
Good luck.
Peace,
Pete Zaria.
Propane is heavier than air, so when fueling, you should point the barrel downwards and put fuel in from the cleanout in the back.
What I do is open the valve and stick the torch head down inside the chamber, count to 7 or 8, pull the torch out, replace the cap, turn off the torch, aim the barrel upwards for a few seconds so the propane distributes around the chamber, then aim and fire.
Another possible problem is that the propane isn't mixing with the air very well. Putting a computer fan ($3) in the chamber solves this problem. Look around the site for insturctions on wiring it, but it's pretty self explanitory. Don't bother with a timer circut, just use a momentary on switch.
How many spark gaps do you have, and where in the chamber are they placed?
Good luck.
Peace,
Pete Zaria.