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PostPosted: Sun Nov 20, 2016 3:02 pm 
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Joined: Sat Nov 29, 2014 5:55 pm
Posts: 89
Location: Elmira
I was in at princess auto this week and noticed that they had the Crosman vantage on sale for $99 with a 4x32 scope. I am a sucker for a good deal so I had to buy one :D Although I have a few high end German guns I also have a soft spot for the Crosman springers. I have a few Phantom .22's and a Heavily moded Benjamin Classic .22 as well. I was curious as to how the Vantage .177 was detuned so I took it apart and this is what I found. It uses the same soft spring as the new model Phantom .22 but it also has a longer piston than the Phantom to detune it even further. I have seen the long and short pistons in on line write ups and they have been 193mm for the long and 145mm for the short pistons. The vantage has a 170mm piston so it is about half way between the old long and short pistons. I decided to try another experiment by swapping the 170mm piston from the Vantage with a 145mm piston from a Phantom. This gives the .177 vantage the same power plant as the stock .22 Phantom. The Phantom shoots 14.3 grn hollow points about 425fps so I would think the .177 should be right around the 500fps with a 8grn .177 pellet. I then installed the longer 170mm piston from the Vantage in the .22 Phantom with a full power spring and the results were quite nice. Right around 500 fps with a nice shot cycle. I find the Crosman rifles in this series are a bit rough when set to the US spec full power but they are too weak in the Canadian versions that are shooting nearly 100fps under the 500 fps limit. I find they work best when they are tweaked the 500 to 600 fps power level. With the different springs and pistons there are a lot of options.


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PostPosted: Wed Nov 23, 2016 12:04 am 
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Joined: Sat Sep 03, 2005 9:25 am
Posts: 3432
Location: Ontario, Canada
I plan to disassemble my new .177cal Crosman Optimus this week. It's a detuned rifle from CanTire and clocks at 495-500fps. The cocking stroke is definitely longer than my old Quest but I'm doubting it is the shortest piston version. Like you said, a 500-600fps tune is sweet. My plan is to get another 50-100fps and leave it there.

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PostPosted: Wed Nov 23, 2016 4:58 am 
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Joined: Fri Jul 01, 2016 7:47 am
Posts: 711
Location: Bradford
TCooper wrote:
I plan to disassemble my new .177cal Crosman Optimus this week. It's a detuned rifle from CanTire and clocks at 495-500fps. The cocking stroke is definitely longer than my old Quest but I'm doubting it is the shortest piston version. Like you said, a 500-600fps tune is sweet. My plan is to get another 50-100fps and leave it there.

topic74400.html


Your Optimus is also a candidate for NP conversion. Kit would include new end cap for the ram, ram itself, new piston and seal. Around 100 bucks I think. I dont know what the full power Optimus is supposed to do, probably 800fps plus, but I used a gas ram from a sub PAL Benji. My Optimus is more powerful now (shorter piston maybe, dont remember) but not by much.

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When the 425-hp "street Hemi" version hit the street in 1965, it was akin to taking an M230 chain gun to an arcade shooting gallery
Peter


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