M48 .177 pellet test.

[PACTOO]

Hopefully you can sort something out with them Eric! I have not installed a vortek kit in a gun yet but have heard many positive things about them from several members of the airgun community.

[bitterman]

Yes it is a Diana Model 48 t01 about 20-25 years old. In the US everyone calls them RWS Model 48 (RWS imports them I guess from Diana). It was imported into Canada by Ruko and sold by lebaron.

I already e-mailed Tom, he is the expert and designed the kit. I'm sure he will have a solution. I was shaking my head.... as the site does indicate "♦No modification needed!♦" http://vortekproducts.com/ourstore/Tuning-Kits

I know JM mentioned some Diana Model 48's needed a slightly shorter spring by about a coil. I guess my gun is one of them...

I actaulil inquired on the site as to waht to expect and was told 18-20 ft/lbs i'm at 17.69 ft/ibs... so after breaking in... I expect to gain some fps... the GSI gained about 25-30 fps so that puts me in line power wise with the low end of what Tom G. said.

I don't feel right leaving it to Eric to fix since I purchased wrongly from the Vortec site instead of Eric... If I would have known might have saved me some also.

Right now I'm not unhappy... but I don't notice much difference than the GSI. Its different.... not better not worst. But my FPS is back to normal at least.

Regards,
Bruce

[Lauchlin]

I put a James Maccari spring in my 177 cal 48 Diana 20 years ago the factory spring would break seemed like every month over sprung ,Gun still works fine ..........

[AirGunEric]

The kits I personally installed worked fine/as expected (Diana 350, Diana 34)- but I never did get around to putting a kit in the Model 52 I have laying about. Maybe I should get to this sooner, rather than later, to see what happens...

[bitterman]

Just got an e-mail. Vortek is sending me a new kit. I guess there is something specific so some T01's so they need to machine a different kit to fit correctly. Maybe if you have a t05/t06 it will work? Maybe that is what the problem is they are not generic for all guns?

They are fixing things and taking care of it. Just means I have to wait :(

Regards,
Bruce

[bitterman]

I got a new Vortek kit in the mail tonight. Took about 15 minutes and it was installed.

The install was much easier. Based on comparing the 2 kits side by side. The Diana Model 48 T01 kit is different than the to5/t06. I was over on the Dianawerk collective forum and there is a definite difference in the length of the latch on the T01 verse the t05/t06 piston. As a result the T01 compresses the spring a bit more and this resulted in the binding and failure to cock with the t05/t06 unit was installed.

The recoil is not as harsh either as the original kit.

I did get a peak of 990 FPS with beeman crow magnums but velocities settled into about 970 after a couple shots. I expect this was due to some of the oil int he molly used on the piston seal dieseled slightly. Cpls are doing about 1050 FPS so I definitely need heavier pellets now.

Bruce

[bitterman]

I did a little playing tonight

Did some 5 shot strings to see were things were. Really need 10-20 shots strings but did not have the time.
I shoot the strings one after the other.

Crosman Primier 7.9 1022 1031 1034 1038 1042
Beeman Crow Magnum 8.8 961 958 964 967 971
Beeman FTS 8.64gr 992 999 998 994 1000
Beeman Trophy 7.88gr 1020 1028 1027 1040 1043
RWS Meisterkugeln 8.2gr 986 989 1001 988 991
RWB Super Magnum 9.5gr 903 927 906 902 911