 |  | | | |  | |  |  | Air Venturi vs. Tune job for Gamo Big Cat |  | |  |  | |
 Posted: Thu Jul 23, 2009 11:38 pm |
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| Buster Bodine |
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| Joined: 22 Apr 2009 |
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I've been looking at these Air Venturi jobbies they've got over at Pyramid and I was wondering if using one of these would alleviate the need for a tune job or if the gun would still benefit from a tune after one of these is installed?
As I understand it, a tune job is basically just removal of burrs and proper lubrication to ensure smooth spring travel and reduce spring wear.
Right? Wrong? Indifferent?
Whaddaya'll think? |
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| Posted: Fri Jul 24, 2009 7:40 am |
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| Slavia |
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| Quote: |
| As I understand it, a tune job is basically just removal of burrs and proper lubrication to ensure smooth spring travel and reduce spring wear. |
And fitted spring guides, and thrust washers, and polished spring ends - all this would all be eliminated by a gas spring.
It still leaves stuff like polishing the muzzle crown, a trigger job, perhaps an aftermarket trigger, smoothing the cocking linkages, buttoning the piston, smoothing the barrel pivot and lockup parts, etc. These things probably pay less dividends that powerplant mods, and need depends upon the condition of your gun and your own inclinations. |
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| Posted: Fri Jul 24, 2009 2:34 pm |
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| broommaster2000 |
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What the heck, I posted something here. Guess I forgot to push submit while I was looking for some info. 
Right, as I wanted to say, they don't really guarantee increase in power. 
Someone on the Dutch forum installed a venturi spring and had a small decrease in power. I'm trying to find the numbers, but I can't find it.
One of the Gurus says it certainly won't increase power over a good regular spring tune... |
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| Posted: Fri Jul 24, 2009 7:36 pm |
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| sniper |
| Silver Status Member |
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| Joined: 28 Nov 2008 |
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| Location: Star, Idaho |
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that is what i've heard. tim (mac-1) says the after market gas rams are crap.
another airgunsmith i found online in my area (his name excapes me) says the same.
theoben makes a ram for the gamo's. theoben is the inventer of gas rams. i had a quote of $150 installed for my 440.
i did a macarri spring instead. it was under $100 installed.
though my rifle died soon after....(it's fixable). no twang, veeeery smooth firing action.
kinda like a low "gonk". |
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| Posted: Fri Jul 24, 2009 7:41 pm |
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| Buster Bodine |
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No, I wasn't expecting an increase in power but a decrease in power would be a VBT indeed so thanks for the warning.
I'm not planning on making the conversion now as there's not currently anything wrong with my rifle.
But I was wondering if maybe this might be the way to go one of these days when the spring has lost power and it's time for a replacement.
Snipper, Got a link for this theoben fella? |
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| Posted: Fri Jul 24, 2009 7:51 pm |
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| Griff1950 |
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| Location: Arkansas |
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| From what I've been able to gather online, there is sometimes a 10% decrease in velocity. For my use, the ability to leave the rifle cocked for long periods is a huge bonus that would override the loss of power. |
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| Posted: Fri Jul 24, 2009 9:22 pm |
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| sniper |
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| Location: Star, Idaho |
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| Buster Bodine wrote: |
No, I wasn't expecting an increase in power but a decrease in power would be a VBT indeed so thanks for the warning.
I'm not planning on making the conversion now as there's not currently anything wrong with my rifle.
But I was wondering if maybe this might be the way to go one of these days when the spring has lost power and it's time for a replacement.
Snipper, Got a link for this theoben fella? |
who you callin' snipper buuster?? 
i'm having work related senilitey.  (if i even spelled that right)
theoben is the conjunction of the 2 guys who invented gas rams in the 1980's. i can't remember their names either.
google... "theoben gasram conversions for gamo rifles". you should find someone as close to you as me.
someone else might help with my memory loss today.
i remember the theoben schirocco in the 80's. the first. 830fps+ in 14.3.
even when your spring wears out it'll still shoot. this is my 3rd in my 440. when the last one died... twangy as hell, bent bad, and still hitting 820fps+/7.9. |
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_________________
I believe in gun control,
If there's a gun around I
want to be controlling it....... |
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| Posted: Sat Jul 25, 2009 1:57 am |
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| broommaster2000 |
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Airgunning and not knowing Theoben? 
Over here they're the most "pay to much for your gun" brand.  |
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| Posted: Sat Jul 25, 2009 12:00 pm |
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| sniper |
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| broommaster2000 wrote: |
Airgunning and not knowing Theoben?
Over here they're the most "pay to much for your gun" brand. |
yeah, but tell me you wouldn't want a real "crow magnum". |
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_________________
I believe in gun control,
If there's a gun around I
want to be controlling it....... |
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| Posted: Sat Jul 25, 2009 1:03 pm |
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| broommaster2000 |
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I don't want a Crow Magnum/Theoben Eliminator.
Gimme a HW90 in .25, and I'm happy. Or even better, an original Webley Pat in .25. No Gas Ram needed and truly a special rifle. |
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| Posted: Sat Jul 25, 2009 2:02 pm |
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| fritz |
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| The eliminator is SEXY. I'll take one any day. Well... then again... if it's free I'll probably take anything. |
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Speed is impressive, accuracy is deadly.
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| Posted: Sun Jul 26, 2009 1:51 am |
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| broommaster2000 |
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| fritz wrote: |
| The eliminator is SEXY. I'll take one any day. Well... then again... if it's free I'll probably take anything. |
Now your speaking like a Dutchman. |
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| Posted: Sun Jul 26, 2009 10:03 am |
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| fritz |
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| Broom, thinking of what I previously said... that didn't come out just right... |
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_________________
"I never set out to be wierd, it was always everyone else who called me it" -Frank Zappa
Speed is impressive, accuracy is deadly.
It's not that I'm not a people person, it's just that I'm not a stupid people person. |
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| Posted: Sun Jul 26, 2009 10:43 am |
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| broommaster2000 |
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Hahahaha, and I was only paying attention to the "free" part. Back on topic now.
I think the Eli is a bit on the expensive side. It's the most expensive break barrel rifle money can buy over here. I checked. $ 1421.50 for a break barrel.
The only "spring" powered rifle more expensive is the SLR by the same brand.
By the way. Do you guys think we can refer to Gas Spring powered rifles as "Springers"? |
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| Posted: Sun Jul 26, 2009 11:47 am |
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| fritz |
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| Yes. Those who know about the dissimilarities should see how close they are in more serious parts. Although that may cause a problem for those who don't... |
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_________________
"I never set out to be wierd, it was always everyone else who called me it" -Frank Zappa
Speed is impressive, accuracy is deadly.
It's not that I'm not a people person, it's just that I'm not a stupid people person. |
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