HCMP

pat123 · Mon Mar 31, 2008 8:43 pm

HCMP
hybrid and combustion metering for propane

I know it is basic but I had problems with this and it should help people with hybrid fueling.

tell me if you like it

edit: now has propane, butane, and mapp

Counterstriker · Mon Mar 31, 2008 8:46 pm

Picture not working for me.

bigbob12345 · Mon Mar 31, 2008 8:47 pm

this is really well done and completely accurate
I like it a lot, will give me a break from that calculator for a while

counterstriker:it is a fuel and meter calculator, just pres the download button

pat123 · Mon Mar 31, 2008 8:55 pm

Thanks it only took about 5 minutes to make. I am going to add some more stuff to it soon.

daberno123 · Mon Mar 31, 2008 8:56 pm

Very Nice!

Easy, simple, and user-friendly. A lot less confusing than other calculators I've tried to use. Good work!

Edit: what else are you planning to add?

pat123 · Mon Mar 31, 2008 9:21 pm

a way to find chamber and barrel volume. Do guys see anything else that I should add? I updated it a little, I'll post the new version tomorrow.

jon_89 · Mon Mar 31, 2008 10:16 pm

This is great. Quick question though. A 1x mix is just regular combustion right? I would suggest maybe doing half mixes like 2.5x or 3.5x mix because I see many people doing this.

Check out my YouTube SpudGun Channel! · Mon Mar 31, 2008 10:31 pm

Cool bananas, will test it soon

Edit: Just noticed the equation uses .953, now I could be wrong here, but glancing over SB15's topic, which I think you based this off, he used .958 for propane...

There's probably some crystal clear explanation I just looked over.

Oh and I also made a second sheet for MAPP gas, as i'll probably be using that.

Thanks

SpudUke5 · Mon Mar 31, 2008 10:43 pm

I got slightly different results:
For 100 ci chamber
25 ci volume of pressure meter.

My program:

For 3x, i got 7.73 psi
For 4x, i got 10.3 psi

Your program:
3x i got 8.69 psi
4x i got 11.59 psi

Just slightly off but i could make a big difference.

starman · Mon Mar 31, 2008 10:57 pm

Your calculator predicted a little high on mine too, 74 psi. I predicted and have been using 63 PSI. 225 CI chamber, 2.2 CI meter. My calc may be wrong, I'll check mine again.

pat123 · Tue Apr 01, 2008 3:22 pm

I just uploaded a new version.

Edit: Just noticed the equation uses .953, now I could be wrong here, but glancing over SB15's topic, which I think you based this off, he used .958 for propane...

thanks i just changed that. by the way thanks to SB15 for all of the formulas in the first place

This is great. Quick question though. A 1x mix is just regular combustion right? I would suggest maybe doing half mixes like 2.5x or 3.5x mix because I see many people doing this.

yep 1x is normal combustion. I'll add those too.

Oh and I also made a second sheet for MAPP gas, as i'll probably be using that.

If you don't mind giving it to me Ill add that to it too.

Hubb · Tue Apr 01, 2008 3:36 pm

This thread reminds me. I need to update my CO2 calculator thread.

Pat, if you want, I can send you a copy of mine so you can add to this. I posted the original a while back, but I have since made updates to it, including more accurate CO2 data, as well as high pressured air data. If you're interested in throwing in a little pneumatics with this, just let me know.

Oh, and have you considered adding butane to your spreadsheet. A lot of members use it, too.

daberno123 · Tue Apr 01, 2008 3:41 pm

Just downloaded the newer copy. Only complaint is the yellow background...my eyes...they burn.

Oh and you should definitely make different sheets for different fuels

pat123 · Tue Apr 01, 2008 3:46 pm

I'll take co2, air, butane, etc. just need a new name.

pat123 · Wed Apr 02, 2008 8:00 pm

I updated it now it works for mapp, propane, and butane. I need someone to check over it and make sure it is right for butane and mapp gas.

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