SpudFiles

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My chamber pressure meter only cost me about $120 total, and it's worked just as well at 2x oxy/MAPP as it did at 10x air/propane and 20x oxy/propane. The fueling gauge is 15 psi and +/- 1% of the full scale, leading to a margin of error of +/- .15psi on the fueling, well below what could cause an unignitable mix. The gauges cost $36 each from McMaster, not unreasonable by even the cheapest standards considering the quality (or lack thereof) of hardware store gauges.

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i think everyone overestimates how accurate a gauge needs to be. i am going to try the chamber pressure meter with a cheap 15psi gauge and if it works i am going to laught (?) at DYI for the money he spend.

spudfarm wrote:i think everyone overestimates how accurate a gauge needs to be. i am going to try the chamber pressure meter with a cheap 15psi gauge and if it works i am going to laught (?) at DYI for the money he spend.

Ofcourse it works, but you may inject 10% too much or too less, while his fuel meter never injects more then 1% off the perfect injection amount.

10% isnt really notable to the human eye, but on ultra advanced guns, you will fight for every m/s you can get, and thus you will want to have accurate metering.

Note:
I just made up the numbers 10% and 1%, they may be somewhat different, but its not about that anyway. I hope you get the point.

well i will see it over the chrony if one shot is more powerfull than the other one.

My original air through meter design cost me all of $20 to build from scratch, and is more tolerant to error than a chamber pressure meter.

I can use my meter for anything from the size of Nova's Brass Bruiser to D_Hall's pipe dream with no modification, and the exact same set of numbers every time, which is more than anything you could hope to achieve with a volumetric meter. The range from my meter for propane would be from 3.2% - 5.2%. You will notice a very small performance difference within that range.

So for any gun you would use th esame pressure of propane right?
1x would be .62
2x would be 1.23 and so on right

are those numbers right i think i did it right.

if it is right it should be 1.24

1.24 for 2x?

400 posts :blob2: :blob3: :blob4: :blob5: :blob6: :blob7: :blob8: :wav:

Here's a hybrid fueling table for my system, up to 20x:

It used to be a nice pretty table, but the forum f*cked it up pretty bad, so I wish you luck

Hybrid Mix Tables

Air / Propane

Nx Propane Air Total
1 0.616psi 14.7psi 0.616psig
2 1.23psi 29.4psi 15.93psig
3 1.85psi 44.1psi 31.25psig
4 2.46psi 58.8psi 46.56psig
5 3.08psi 73.5psi 61.88psig
6 3.69psi 88.2psi 77.19psig
7 4.31psi 102.9psi 92.51psig
8 4.93psi 117.6psi 107.83psig
9 5.54psi 132.3psi 123.14psig
10 6.16psi 147.0psi 138.46psig
11 6.77psi 161.7psi 153.77psig
12 7.39psi 176.4psi 169.09psig
13 8.00psi 191.1psi 184.4psig
14 8.62psi 205.8psi 199.72psig
15 9.24psi 220.5psi 215.04psig
16 9.85psi 235.2psi 230.35psig
17 10.47psi 249.9psi 245.67psig
18 11.08psi 264.6psi 260.98psig
19 11.70psi 279.3psi 276.3psig
20 12.31psi 294.0psi 91.61psig


Oxygen / Propane

Nx Propane Oxygen Total
2 1.23psi 2.94psi 4.17psig
3 1.85psi 5.88psi 7.73psig
4 2.46psi 8.82psi 11.28psig
5 3.08psi 11.76psi 14.84psig
6 3.69psi 14.7psi 18.39psig
7 4.31psi 17.64psi 21.95psig
8 4.93psi 20.58psi 25.51psig
9 5.54psi 23.52psi 29.06psig
10 6.16psi 26.46psi 32.62psig
11 6.78psi 29.4psi 36.12psig
12 7.39psi 32.34psi 39.73psig
13 8.01psi 35.28psi 43.29psig
14 8.62psi 38.22psi 46.84psig
15 9.24psi 41.16psi 50.4psig
16 9.86psi 44.1psi 53.96psig
17 10.42psi 47.04psi 57.46psig
18 11.09psi 49.98psi 61.07psig
19 11.7psi 52.92psi 64.62psig
20 12.32psi 55.86psi 68.18psig

so why do you need so many gauges if a 0 - 15 psi one will work from 1 to 20x?

I fixed the fueling table, hope you don't mind.
Edit: Something seems to be wrong with the Air / Propane numbers.

I think for total he means the total pressure that will be added

Those "total" numbers seem somewhat screwed up. How come that one is lower?

You should spend more time making your tables DYI .