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Optimum temperature for running lm4


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#1 KeithHK

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Posted 03 March 2014 - 07:22 AM

Dear all,
What temperature do you think is the best for running a lm4? I think it's about 25 degree Celsius. What do you think?

Edited by KeithHK, 03 March 2014 - 08:48 AM.


#2 BeachEMT

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Posted 03 March 2014 - 07:42 AM

I would say 27+ (approx. 80F, since we are on an American forum). That's the point where my gun will consistently shoot 400fps with virtually no cool-down.

#3 KeithHK

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Posted 03 March 2014 - 08:48 AM

That's awesome to have no cool down. I am actually wondering if the rifle is suitable to shoot in summer time only. My lm4 always get cold at 20 degree Celsius.

Edited by KeithHK, 03 March 2014 - 08:48 AM.


#4 bigcandy01

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Posted 06 March 2014 - 12:41 PM

Its pretty dependent on the gas you use.  I have gone to using MAPP gas year round, as it has (virtually) no cool down.  Its a little pricey'er as compared to propane, but its very consistent.

#5 kwaispro727

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Posted 06 March 2014 - 01:17 PM

Well I would say anything above 80 is ideal.  I don't think too hot is really a thing because if it's too hot for the gun it's too hot for you too lol you'll sweat all the water out of your body before you can drink enough to replenish if you're a very actively moving player like me.

On the subject of MAPP, that's what? Propane and butane or something? Couple questions.  What happens if that and green gas a present in the same mag? Problems?  And how's the lubrication work with that?

#6 Downs

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Posted 06 March 2014 - 02:39 PM

Propane and Butane is usally called isobutane.  It's usually what the little camping canister stoves run off of.

Here's MAPP gas.  Looks like it has some form of Acetylene in it along with Propane.

#7 Chuck S

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Posted 06 March 2014 - 03:21 PM

The stench of MAPP is reason enough to not use it. I don't even want the cylinders in my shed!  :)

-- Chuck

#8 KeithHK

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Posted 07 March 2014 - 09:29 PM

Can MAPP really provide a better performance for the rifle? If it does, I don't care about the stench.

Edited by KeithHK, 07 March 2014 - 09:29 PM.


#9 Chuck S

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Posted 08 March 2014 - 09:54 AM

Decide after you've experienced the smell!  :)  As noted I won't even store the canister in my shed the gas smells so bad.  Stinks bad during shooting and the magazines stink long afterwards.

It does produce more pressure at colder temperature than propane.  Someone produced a chart a couple of months ago.  Perhaps a search will find it.

The cylinder I have is labelled MAP-PRO and is not really MAPP.  True MAPP may be available outside the US but in the spring of 2008, true MAPP gas production ended in North America (code for USA and Canads) when production was discontinued at the only remaining plant making it. Current products labeled "MAPP" are in fact MAPP substitutes. These versions are stabilized liquefied petroleum gas (LPG) with high levels of propylene.

-- Chuck

Edited by Chuck S, 08 March 2014 - 10:26 AM.


#10 Kreasy

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Posted 28 April 2014 - 11:38 AM

what about higher than 80 degree temps?  anyone have any experience with this...i.e. 90-100+

I just ran my LM4 on Sunday's game and it was our first day that made it into the 90's and I was dumping gas, got through about half a mag maybe and then no more gas.

I was using green gas and from two different cans....maybe something with the LM4, but it was doing it on numerous mags and all of them are pretty new, same with the LM4

Thanks!

#11 netpoc

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Posted 28 April 2014 - 05:41 PM

Check your piston o-ring. It may be damaged, undersized, or need lubrication.

#12 BeachEMT

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Posted 29 April 2014 - 07:49 AM

The only problem my LM4 has when running in 90+ temperatures is that it shoots around 415 fps. Like Net said you should check out your gas system. It sounds like there's a leak somewhere.

#13 kwaispro727

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Posted 29 April 2014 - 08:47 AM

My LM4 has issues in low temperature.  Under 60 degrees and it just flips a ****.  I'll either get a triple feed (I haven't done the o-ring barrel mod) or the gas valve gets stuck down and all the gas comes out.  I got my other 4 mags the other day and waited for it to hit 65.  I went outside and dumped all 5 no problems whatsoever.  If I try doing that in 50 degree weather forget it.  Something has to be wrong, but I can't figure out what it is and I don't plan on playing with it except in the summer and in doors anyway.

#14 netpoc

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Posted 29 April 2014 - 04:28 PM

You have to use weather appropriate lube. Meaning thick lube in the hotter temps and thinner lube in the winter months. I'm in California and I play with my LM4's in temps ranging from 40 to 100 degrees. Obviously the idea is to try to keep the gas as warm as possible in the cold weather, but in the heat you should be fine as long as there are no pre-existing problems.

#15 kwaispro727

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Posted 30 April 2014 - 03:49 AM

I've been told frog lube is one of the best for cold temperatures. I've been using that.

#16 netpoc

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Posted 30 April 2014 - 02:31 PM

I've found that using Frog Lube on the piston o-ring is not a good thing. It swells the o-ring (to the point where it restricts movement) and leaves the chamber area dry. I use Frog Lube on everything else aside from that area. In the summer a thick silicone oil and in the winter a thin oil will work great in that area. The base plug also needs the appropriate lube as well, so don't forget to get some oil on that when you pull the bolt/piston.

#17 BeachEMT

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Posted 30 April 2014 - 06:36 PM

I've never had a problem with FrogLube in any temperature. One thing I have noticed is that it gets sticky over time, so you just need to make sure you wipe down and reapply it every so often.

Edited by BeachEMT, 30 April 2014 - 06:36 PM.





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