Mamba problems

[Mongrel454]

Ok i recently installed a mamba kit on my seac asso 115.
Before installing the kit the gun had a bit of power, but since i was going on a trip i knew i needed some more.
But now the gun is pretty much crap, no power what so ever(well has some but its less than it was without the kit)

So my question is what could i have done wrong?
It is pumped to 20-22 bar so it has ample pressure.
My guess is maybe it isnt sealing and it lets water in, but i aint no expert
I installed the kit as per the design, but maybe i misinterptered something.



Dissapointed

 

[GreekDiver]

Ok i recently installed a mamba kit on my seac asso 115.
Before installing the kit the gun had a bit of power, but since i was going on a trip i knew i needed some more.
But now the gun is pretty much crap, no power what so ever(well has some but its less than it was without the kit)

So my question is what could i have done wrong?
It is pumped to 20-22 bar so it has ample pressure.
My guess is maybe it isnt sealing and it lets water in, but i aint no expert
I installed the kit as per the design, but maybe i misinterptered something.



Dissapointed

describe what is happening when you fire. My guess is the seal isnt sealing. You can usually tell when the feels heavy underwater. You probably put the sealing kit backwards or something. The shot will probably go like 3 ft if the barrel gets water in it.

 

[Mongrel454]

Thx for the reply Greek.
You may be right, i may not be loading in in 1 swift slide and losing the seal in the process.
The gun shoots 10-12ft not 3ft, but with little power.

Is there anything else it can be or is that pretty much the only problem you get with mamba?

I will give it a try when my leg heals up, otherwise i may put the gun back to normal and use the kit on my cressi SL100.

Once again thx GreekDiver

 

[GreekDiver]

Loading the gun is all technique and hand placement. I have my guns at 25-26 Bar and trust me its hard to load if you dont do it right. The trick is locking the mech. For me, its a lot of biceps, abs, shoulders then back. Pulling it down from the start is all back and shoulders.

It fires super hard though. I can barely make out the spear when its fired.

 

[foxfish]

I had a few disappointing shots when I first started using my 115 mamba, I guess it is about your loading technique? What I did was lower the pressure to about 17atm that made it much easier to load correctly, now it is set at 22atm = plenty power for my use.
Did you buy a pressure gauge?

 

[GreekDiver]

I had a few disappointing shots when I first started using my 115 mamba, I guess it is about your loading technique? What I did was lower the pressure to about 17atm that made it much easier to load correctly, now it is set at 22atm = plenty power for my use.
Did you buy a pressure gauge?

When i first got my mamba i had a couple of shots like that until i realized the way i setup the sealing kit was backwards. I started with low pressure 20 and then moved up to 24. Now im on 25-26 and thats enough. I will try to upload a video of a couple shots i took with my new camera.

 

[Coral Sniper]

Hey just a quick question.

How many wraps of line do you guys have on your mambas?

I have 2 wraps on my cyrano 110 at 25 bar.

 

[GreekDiver]

3 wraps of line.

 

[foxfish]

Three on my 90 & three on my 115.

 

[Mongrel454]

Thx guys i will give it another try.
And no Foxfish i havent gotten a pressure gauge i just went by what my local dive shop put in it.

I can load it, but it is hard. Im not sure if i load it in one swift movement or stop in the middle.

I will try it in a few weeks when my leg gets better.

Thanks again

 

[foxfish]

OK mate good luck but you really need a gauge.

 

[Mongrel454]

yeah i will get one......eventually

 

[popgun pete]

Lack of power with the Mamba system is due to too much water entering the barrel. The elimination of the muzzle relief ports, which were present in the original equipment muzzle, means that you get water braking of the barrel piston if it tries to force any appreciable volume of water in front of it through the muzzle opening, which is much smaller than the inner barrel diameter. Water is incompressible, that is why the shooting performance is adversely affected when it cannot flow rapidly out of the gun.

When the Mamba system works properly you only have a very small amount of water in the barrel, the rest is a partial vacuum once the gun is loaded. A small amount of water is necessary to lubricate the piston "O" rings as they slide rapidly along the bore of the inner barrel. Any loss of sealing at the muzzle will break the vacuum and allow the gun to gradually suck additional water into the barrel after you have loaded the gun. Check the line slide "O" rings for any damage, it does not take much of a nick for the gun to suck in water. The line slide's "O" rings have to seal properly in the muzzle and on the shaft as the loading task is carried out in order to prevent any additional water being taken into the barrel, otherwise shooting performance goes backwards.

 

[Mongrel454]

Thx Pete

Where in oz you from mate?

 

[popgun pete]

The currently very chilly south-east, in Victoria.

 

[Mongrel454]

Yeah mate the south is damn cold at the moment.
Im from the other side of OZ, but same conditions..BRRRRR

 

[Mongrel454]

Well i jumped on my mates boat on saturday and we headed out to do some spearing.
The water was a chilly 16 degrees and with my 3/2 steamer boy did i feel it LOL.
I took the advice and loaded the gun in one smooth stroke and still the gun lacks power . I checked all o rings and they look good, plus they must be working as the gun floats even when loaded.
i even loaded the gun out of water, jumped in, looked for air bubbles to see if it was leaking and even when fired that way it was still lacking in power
The only thing i can think of now is not enough pressure or i got a DUD......Even though my hand pump wont pump anymore into the gun.

So untill i get a manometer i guess its time to hang it on wall.

 

[Mongrel454]

It fires super hard though. I can barely make out the spear when its fired.

I can press the trigger and grab my line and stop the spear before it goes more than 1-1.5 wraps....

 

[GreekDiver]

send me a picture of how your spear is setup. The slider, sealing kit, ect... all together on the spear

 

[Mongrel454]

Here is some pics of the Arrow setup for you.

In one way i hope i havent set it up wrong and look like an idiot but on the other hand i do so i know what is the problem.