CO2 only model 98/custom?

Mortus Eclipse · #11 (**permalink**) 07-21-2011, 12:53 AM

Quote:

Originally Posted by Magmoormaster

Oh my gosh. So. Much. Misinformation.

First off, I have heard of 98's and A5's not being able to chrono up high enough on compressesd air. It's probably just due to the springing. The output pressure on the compressed air tank is probably further from the valve's sweetspot. CO2 in ideal conditions will output at 800 PSI, but we all know there is no such thing as ideal conditions. Any difference in temperature will change the pressure. So even if a compressed air tank is outputting at 850 PSI, a CO2 will, more often than not, be either higher or lower in pressure. It will never be the same. And because of that, the velocity will be different. And yes, CO2 fluctuates enough that a 100 FPS difference is very plausible.

Secondly, not all guns will run off compressed air. There are several Tippmanns that require liquid CO2 because the internal air passages are drilled so small that liquid CO2 is the only thing with enough potential energy to propel the ball.IIRC VM-68's/EMC-68's/PMI-3's require the use of CO2 as well.

Thirdly, while there are some differences in the internal design of newer 98s compared to older 98s, none of these differences will affect how it chronos. The only differences have been air fittings and trigger setups.

I have not had any issues with my 98 Custom in regards to the use of compressed air, so I do wonder a little if you have actually seen these issues in the field or if they are stories and rumers that have reached you. Perhaps something else was wrong with those 98s and A5s like mentioned before, using a low pressure reg instead of a standard reg, or maybe some other internal problem.

Not saying you are wrong on the subject but in a way I do wonder how may occurrences are due to the gas and not some other issue preventing proper operations. Obviously not all 98s and A5s have a chronoing issue, so something has to be different between those that do and those that don't.

Magmoormaster · #12 (**permalink**) 07-21-2011, 01:13 AM

Read my first paragraph again.

rotcodnatas · #13 (**permalink**) 07-21-2011, 01:54 AM

Mag, I was gonna say pretty the same thing but, eh, laziness.

Mortus, tippmanns don't alway have the best production consistency as other markers so some people do have pressure issues even with HP tanks. Most often spring problems but also fittings/seal as well, like Magmoor said. Low pressure tippmann setups are I guess you could say, notorious for showing these marker to marker variances.

Mortus Eclipse · #14 (**permalink**) 07-21-2011, 01:56 AM

Quote:

Originally Posted by Magmoormaster

Read my first paragraph again.

Then I must be confused. Are you saying the springing is not right on all 98 and A5s for HPA, or that the springing can vary that much from gun to gun? If the former then I stand by my previous comments. Otherwise it seems plausible, but I still have to wonder how many are something else.

Psiworx · #15 (**permalink**) 07-21-2011, 05:51 AM

Hmmm. I'm kind of confused to. I thought his first paragraph said "Oh my gosh. So. Much. Misinformation." Its not a very good paragraph but...its a paragraph.

What he is saying is.......show me a Tippmann Model 98 that won't run on High Pressure Air and I'll show you a Model 98 that won't run on CO2 for very long. We are all making the assumption that your HPA system outputs at 850 psi (+ or - a few psi) and that you are not running a low pressure HPA tank (450 psi).

If it will run for more than 50 shots on CO2 .....it will run on HPA.

Magmoormaster · #16 (**permalink**) 07-21-2011, 01:11 PM

You guys are not listening to me.

SPRINGS WEAR OUT. Or they aren't made quite right. CO2 differs in pressure due to temperature fluctuations. Different pressures work differently with different springing. If the springing is off, the different pressure of CO2 WILL make it shoot a different velocity.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode